CN117164300B - Self-leveling high-strength cement adhesive for porcelain insulator and preparation method thereof - Google Patents
Self-leveling high-strength cement adhesive for porcelain insulator and preparation method thereofInfo
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- CN117164300B CN117164300B CN202311045535.6A CN202311045535A CN117164300B CN 117164300 B CN117164300 B CN 117164300B CN 202311045535 A CN202311045535 A CN 202311045535A CN 117164300 B CN117164300 B CN 117164300B
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention belongs to the technical field of high voltage of electric power, and discloses a self-leveling high-strength cement adhesive for a porcelain insulator and a preparation method thereof, wherein the cement adhesive comprises a base material, an auxiliary agent and water, the amount of the auxiliary agent is 0.1-1.4 wt% of the base material, the amount of the water is 16-25 wt% of the base material, the base material comprises, by mass, 40-60 wt% of silicate cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica powder, and the auxiliary agent comprises a polycarboxylic acid compound water reducing agent, an anticracking agent, a defoaming agent and polyether modified organosilicon. The cement adhesive prepared by the invention is filled in a porcelain piece, and is subjected to steam curing for 4-8 hours at 40-50 ℃, the strength is more than or equal to 100MPa, and the cement adhesive has the characteristics of self-leveling, high mechanical property and moderate elastic modulus, and has a good application prospect, and the molding time is short.
Description
Technical Field
The invention relates to the technical field of electric power high voltage, in particular to self-leveling high-strength cement adhesive for porcelain insulators and a preparation method thereof.
Background
Porcelain insulators are mainly used for external insulation parts of high-voltage power transmission and supply lines, ultra-high-voltage power transmission and supply lines and power station electric equipment, and therefore, the porcelain insulators are required to have high external insulation performance. The porcelain insulator mainly comprises porcelain pieces, cement adhesive and hardware fittings. The cement adhesive is extremely important as a main material for connecting porcelain pieces and hardware fittings, and the cement adhesive of most enterprises is compacted by manual filling and then vibration at present, so that the efficiency is low.
However, with the improvement of the performance and quality requirements of products, the automatic glue production has become an essential trend, and the requirements of cement glue are necessarily self-leveling, and vibration is not needed, so that the realization of the high strength of the cement glue and the realization of the long-time self-leveling performance are key technologies.
In order to solve the technical problems, the prior art CN201310703097.8 discloses a cement adhesive, and the cement adhesive is prepared by uniformly mixing all preparation raw materials, placing the mixture in a die, removing the die after 24 hours, and then moving the mixture to the water at the temperature of 35-45 ℃ for curing for 3 days, wherein the strength can reach 100MPa, the efficiency is low, and the turnover time is long. In the prior art, CN202210822440.X utilizes modified graphene to improve and improve the performance of the adhesive, but the modified graphene has complex process, large doping amount (20-30% of silicate cement) and extremely high preparation cost, and prevents large-scale industrial application of the modified graphene. In addition, the compressive strength of the concrete can reach 100MPa after 2d by adopting a natural curing mode. The maintenance process adopted at present has a longer period, which greatly increases the stock pressure and affects the overall production efficiency of the porcelain insulator. The self-leveling and high-strength are realized, and meanwhile, the rapid curing and forming are also the technical difficulties and key technologies in the whole industry. Improvements to the above problems are needed to meet production and market demands.
Therefore, the invention provides a self-leveling high-strength cement adhesive for porcelain insulators and a preparation method thereof.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a self-leveling high-strength cement adhesive for porcelain insulators and a preparation method thereof. According to the invention, the artificial porcelain sand is adopted to replace the traditional aggregate taking silicon dioxide as a main component, so that the strength of the cement adhesive can be improved, the potential risk caused by the alkali aggregate reaction of the traditional river sand can be greatly reduced, and the spherical silica micropowder is adopted in combination with the self-made flatting agent, so that the self-leveling of the adhesive can be realized, the manual operation is reduced, the loss of the fluidity is smaller, and the operability of the cement adhesive is greatly improved. The invention adopts a steam curing system, has short molding time, greatly reduces the production period of the cement adhesive, reduces the stock pressure, greatly reduces the production cost, and realizes the dual purposes of quality improvement and cost reduction, thereby greatly improving and widening the application and market competitiveness of the cement adhesive.
The self-leveling high-strength cement adhesive for the porcelain insulator and the preparation method thereof are realized by the following technical scheme:
the invention provides a self-leveling high-strength cement adhesive for porcelain insulators, which comprises a base material, an auxiliary agent and water, wherein the auxiliary agent is 0.1-1.4 wt% of the base material, and the water is 16-25 wt% of the base material;
wherein, the base material comprises the following components by mass percent:
40-60 wt% of Portland cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica micropowder, wherein the total amount of all preparation raw materials of the base material is 100wt%;
the auxiliary agent comprises a polycarboxylic acid compound water reducer, an anticracking agent, a defoaming agent and a leveling agent, wherein the leveling agent is polyether modified organic silicon.
Further, the dosage of the polycarboxylic acid compound water reducer is 0.1-0.3 wt% of the base material;
The dosage of the anti-cracking agent is 0.1-0.3 wt% of the base material;
The consumption of the defoaming agent is 0.1-0.3 wt% of the base material;
the consumption of the leveling agent is 0.1-0.5 wt% of the base material.
Further, the polyether modified silicone is prepared by the steps of:
s1, uniformly mixing polymethylhydrosiloxane and polyether F-6 to obtain a mixture A;
Wherein the mass ratio of the polymethylhydrosiloxane to the polyether F-6 is 1:1.8-2.2;
S2, uniformly dispersing a catalyst in the mixture A to obtain a mixture B;
And S3, carrying out reflux heating treatment on the mixture B, introducing nitrogen when the temperature is raised to 78-82 ℃, then adding toluene, continuously raising the temperature to 105-115 ℃ for carrying out constant temperature reaction for 6-10 hours, and removing the toluene after the reaction is completed, thus obtaining the polyether modified organosilicon.
Further, the catalyst is an isopropanol solution of chloroplatinic acid, wherein the mass concentration of the chloroplatinic acid in the isopropanol solution is 1wt%;
And the mass ratio of the catalyst to the mixture A is 1.0-2.0 wt% 1.
Further, the mass ratio of the modified starch to the mixture B is 0.15-0.25:1.
Further, the Portland cement is 525#PII or PII cement.
Further, the ceramic sand is ceramic sand with aluminum content more than or equal to 80%, and the grain size is 30-70 meshes.
Further, the purity of the silicon micro powder is more than or equal to 99%, and the silicon micro powder is spherical and has the particle size of 10-200 nm.
Further, the polycarboxylic acid compound water reducer is prepared through the following steps:
Mixing lithium salt into the polycarboxylic acid water reducer, and uniformly mixing to obtain the polycarboxylic acid compound water reducer;
The lithium salt is lithium nitrate or lithium carbonate, and the doping amount of the lithium salt is 15-25 wt% of the polycarboxylate water reducer.
Further, the anticracking agent is polypropylene fiber, the length of the polypropylene fiber is 5.5-6.56 mm, and the length-diameter ratio is 5-10.
Further, the defoamer is hydrocarbon with the purity more than or equal to 98 percent.
Further, the leveling agent is polyether modified organic silicon.
The second object of the present invention is to provide a method for preparing the self-leveling high-strength cement adhesive, which is characterized by comprising the following steps:
Step 1, weighing the base material, the auxiliary agent and the water with corresponding mass according to the proportion for standby, wherein the base material is prepared from the following raw materials in percentage by mass:
40-60 wt% of Portland cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica micropowder;
step 2, uniformly mixing the silicate cement, the porcelain sand and the silica micropowder to obtain a base material;
And step 3, uniformly mixing the base material and the auxiliary agent, adding water, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for the porcelain insulator.
Compared with the prior art, the invention has the following beneficial effects:
The invention takes silicate cement, porcelain sand and silica micropowder as the base materials of cement adhesive, and the base materials are mixed with additives such as polycarboxylic acid compound water reducer, anticracking agent, defoaming agent, leveling agent and the like and water to form the cement adhesive. The cement adhesive for the porcelain insulator has higher compressive strength, flexural strength and faster forming time, can greatly improve the field turnover period of products, greatly improves the production efficiency, has simple and easy preparation method, and is beneficial to popularization and mass production.
According to the invention, the artificial porcelain sand is used as the aggregate to replace the traditional aggregate with silicon dioxide as the main component, and the artificial porcelain sand has high strength, and the main component is aluminum oxide, so that the strength of the cement adhesive can be improved, and the potential risk brought by alkali aggregate reaction of the traditional river sand can be greatly reduced.
The invention adopts spherical silicon micropowder as the preparation raw material of the base material, has a ball effect due to the nano-scale spherical structure, and can also cooperate with the auxiliary agent, thus not only realizing self-leveling of the adhesive, reducing manual operation, but also having smaller loss of fluidity and greatly improving the operability of the cement adhesive.
The invention adopts a steam curing system, has short molding time, greatly reduces the production period of the cement adhesive, reduces the stock pressure, greatly reduces the production cost, and realizes the dual purposes of quality improvement and cost reduction, thereby greatly improving and widening the application and market competitiveness of the cement adhesive.
Drawings
Fig. 1 is an SEM image of the fine silica powder used in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. And the common silica micropowder adopted in the following examples of the invention is purchased from North Siman New Material Co., ltd. And the common leveling agent adopted is purchased from Shandong Usoxhlet chemical engineering Co., ltd.
The invention provides a self-leveling high-strength cement adhesive, which comprises a base material, an auxiliary agent and water, wherein the dosage of the auxiliary agent is 0.1-1.4 wt% of the base material, and the dosage of the water is 16-25 wt% of the base material;
wherein, the base material comprises the following components by mass percent:
40-60 wt% of Portland cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica micropowder, wherein the total amount of all preparation raw materials of the base material is 100wt%;
the auxiliary agent comprises a polycarboxylic acid compound water reducer, an anticracking agent, a defoaming agent and a leveling agent, wherein the leveling agent is polyether modified organic silicon.
The invention also provides a preparation method of the self-leveling high-strength cement adhesive, which comprises the following steps:
Step 1, weighing the base material, the auxiliary agent and the water with corresponding mass according to the proportion for standby;
wherein, the base material comprises the following components by mass percent:
40-60 wt% of Portland cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica micropowder, wherein the total amount of all preparation raw materials of the base material is 100wt%;
The silicate cement adopted by the invention is selected from 525#PII type cement or P II type cement, and the 525#PII type cement and the P II type cement have high strength and high comprehensive cost performance.
According to the invention, the aggregate adopted in the prior art mainly takes silicon dioxide as a main component, and alkali aggregate reaction can occur after long-term use, so that the risk of material strength damage is considered. The invention also considers that the too large or too small particle size of the aggregate is not beneficial to the comprehensiveness of the adhesive for preparing the artificial porcelain sand, so the invention limits the aluminum content and the particle size of the artificial porcelain sand, and the ceramic sand with the aluminum content of more than or equal to 80 percent and the particle size of 30-70 meshes is required to be adopted. The strength of the cement adhesive can be improved through the artificial porcelain sand, and the potential risk brought by alkali aggregate reaction of the traditional river sand can be greatly reduced.
The purity of the silicon micro powder adopted by the invention is more than or equal to 99 percent, and the silicon micro powder is spherical and has the particle size of 10-200 nm. The morphology of the spherical silicon micro powder adopted by the invention is shown in figure 1, and as can be seen from figure 1, the microstructure of the high-purity silicon dioxide of the silicon micro powder adopted by the invention is in the form of nano-scale spheres, the minimum is 10-20 nanometers, the maximum is 200 nanometers, the spheres are all presented, the silicon dioxide is endowed with the effect like a ball, and the silicon dioxide is added into the adhesive, so that the adhesive has good self-leveling property. The spherical silica powder is adopted to cooperate with the self-made leveling agent, so that the self-leveling of the cement adhesive can be realized, manual operation is reduced, the loss of fluidity is small, and the operability of the cement adhesive is greatly improved.
The auxiliary agent adopted by the invention comprises a polycarboxylic acid compound water reducing agent, an anticracking agent, a defoaming agent and a leveling agent; the auxiliary agent is 0.1-1.4 wt% of the base material, the polycarboxylic acid compound water reducer is preferably 0.1-0.3 wt% of the base material, the anticracking agent is 0.1-0.3 wt% of the base material, the defoaming agent is 0.1-0.3 wt% of the base material, and the leveling agent is 0.1-0.5 wt% of the base material.
In order to enable the prepared cement adhesive to have good early strength, the polycarboxylic acid compound water reducer is prepared by mixing lithium salt into the polycarboxylic acid water reducer uniformly, so that the early strength of the adhesive is improved by adding the lithium salt, wherein the lithium salt is lithium nitrate or lithium carbonate, and the adding amount of the lithium salt is 15-25 wt% of the polycarboxylic acid water reducer.
The anticracking agent adopted by the invention is polypropylene fiber to prevent or inhibit the generation of tiny cracks on the surface of the prepared cement adhesive. In the invention, the polypropylene fiber with the preferable length of 5.5-6.56 mm and the length-diameter ratio of 5-10 is used as the anti-cracking agent, so that the anti-cracking effect is remarkably improved.
In order to improve the defoaming effect, the defoaming agent adopted by the invention is hydrocarbon with the purity more than or equal to 98 percent, and can be selected from liquid glycol or glycerol.
The polyether modified organic silicon is prepared by the steps of S1, uniformly mixing Polymethylhydrosiloxane (PMHS) and polyether F-6, carrying out an addition reaction to obtain a mixture A, S2, uniformly dispersing a catalyst in the mixture A to obtain a mixture B, S3, carrying out reflux heating treatment on the mixture B, introducing nitrogen when the temperature is increased to 78-82 ℃, then adding toluene, continuously heating to 105-115 ℃ for carrying out a constant temperature reaction for 6-10 hours, and removing toluene by adopting a reduced pressure distillation mode after the reaction is completed to obtain the polyether modified organic silicon. The mass ratio of the polymethylhydrosiloxane to the polyether F-6 is 1:1.8-2.2, and the mass ratio of the added toluene to the mixture B is 0.15-0.25:1. The catalyst is an isopropanol solution of chloroplatinic acid, the mass ratio of the catalyst to the mixture A is 1.0-2.0 wt%, and the isopropanol solution of chloroplatinic acid is used as the catalyst, so that the catalyst has low dosage and obvious catalytic effect.
Step 2, uniformly mixing the silicate cement, the porcelain sand and the silica micropowder to obtain a base material;
Step 3, uniformly mixing the base material with the anti-cracking agent, the water reducing agent, the defoaming agent and the leveling agent, and adding water and uniformly stirring to obtain cement adhesive;
wherein the water is 16-25 wt% of the base material.
According to the invention, the preparation raw materials are added successively and uniformly mixed according to the steps, so that the components are fully and uniformly mixed, and the self-leveling high-strength cement adhesive for the porcelain insulator with uniform components is obtained.
Example 1
The embodiment provides a cement adhesive, and the preparation method thereof is as follows:
1) The preparation method comprises the following steps of respectively weighing the preparation raw materials with corresponding mass according to the following mass percentage:
60wt% of silicate cement, 30wt% of artificial porcelain sand and 10wt% of high-purity spherical silica micropowder.
2) Uniformly mixing the weighed 60 weight percent of silicate cement, 30 weight percent of artificial porcelain sand and 10 weight percent of high-purity spherical silica micropowder to obtain a base material;
3) Adding 0.2wt% of polycarboxylic acid compound water reducer, 0.1wt% of polypropylene fiber serving as an anticracking agent, 0.2wt% of defoaming agent and 0.3wt% of leveling agent into the total weight of the base material, uniformly mixing, and then adding 18wt% of water into the total weight of the base material, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for porcelain insulators.
When the adhesive is glued into a porcelain piece, steam curing is performed for 6 hours at the temperature of 40-50 ℃, the adhesive has excellent strength performance, the 3d compressive strength is 117.1MPa, the 3d flexural strength is 14.1MPa, the dry shrinkage is 0.03%, the elastic modulus is 41.8GPa, the 11d compressive strength is 124.6MPa, the flexural strength is 6.2MPa, the dry shrinkage is 0.06%, and the elastic modulus is 42.1GPa. In addition, the compression steaming expansion rate is-0.026%, is lower than the standard requirement and is less than 0.1%, the electromechanical breaking strength is 668MPa, and the breaking mode is foot length.
Example 2
The embodiment provides a cement adhesive, and the preparation method thereof is as follows:
1) The preparation method comprises the following steps of respectively weighing the preparation raw materials with corresponding mass according to the following mass percentage:
60wt% of silicate cement, 32wt% of artificial porcelain sand and 8wt% of high-purity spherical silica micropowder.
2) Uniformly mixing the weighed 60 weight percent of silicate cement, 30 weight percent of artificial porcelain sand and 10 weight percent of high-purity spherical silica micropowder to obtain a base material;
3) Adding 0.2wt% of polycarboxylic acid compound water reducer, 0.1wt% of polypropylene fiber serving as an anticracking agent, 0.2wt% of defoaming agent and 0.3wt% of leveling agent into the total weight of the base material, uniformly mixing, and then adding 18wt% of water into the total weight of the base material, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for porcelain insulators.
When the adhesive is glued into a porcelain piece, steam curing is performed for 6 hours at the temperature of 40-50 ℃, the adhesive has excellent strength performance, the 3d compressive strength is 112.2MPa, the 3d flexural strength is 13.8MPa, the dry shrinkage is 0.03%, the elastic modulus is 45.5GPa, the 11d compressive strength is 120.2MPa, the flexural strength is 15.3MPa, the dry shrinkage is 0.06%, and the elastic modulus is 45.9GPa. In addition, the compression steaming expansion rate is-0.026%, the standard requirement is lower than 0.1%, the electromechanical breaking strength is 674MPa, and the breaking mode is foot length.
Example 3
The embodiment provides a cement adhesive, and the preparation method thereof is as follows:
1) The preparation method comprises the following steps of respectively weighing the preparation raw materials with corresponding mass according to the following mass percentage:
60wt% of silicate cement, 35wt% of artificial porcelain sand and 5wt% of high-purity spherical silica micropowder.
2) Uniformly mixing the weighed 60 weight percent of silicate cement, 30 weight percent of artificial porcelain sand and 10 weight percent of high-purity spherical silica micropowder to obtain a base material;
3) Adding 0.2wt% of polycarboxylic acid compound water reducer, 0.1wt% of polypropylene fiber serving as an anticracking agent, 0.2wt% of defoaming agent and 0.3wt% of leveling agent into the total weight of the base material, uniformly mixing, and then adding 18wt% of water into the total weight of the base material, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for porcelain insulators.
When the adhesive is glued into a porcelain piece, steam curing is performed for 6 hours at the temperature of 40-50 ℃, the adhesive has excellent strength performance, the 3d compressive strength is 115.1MPa, the 3d flexural strength is 13.5MPa, the dry shrinkage rate is 0.03%, the elastic modulus is 46.9GPa, the 11d compressive strength is 121.3MPa, the flexural strength is 15.8MPa, the dry shrinkage rate is 0.04%, and the elastic modulus is 47.1GPa. In addition, the compression steaming expansion rate is-0.025%, the standard requirement is lower than 0.1%, the electromechanical breaking strength is 672MPa, and the breaking mode is foot length.
Example 4
The embodiment provides a cement adhesive, and the preparation method thereof is as follows:
1) The preparation method comprises the following steps of respectively weighing the preparation raw materials with corresponding mass according to the following mass percentage:
0wt% of silicate cement, 40wt% of artificial porcelain sand and 10wt% of high-purity spherical silica micropowder.
2) Uniformly mixing the weighed 60 weight percent of silicate cement, 30 weight percent of artificial porcelain sand and 10 weight percent of high-purity spherical silica micropowder to obtain a base material;
3) Adding a polycarboxylic acid compound water reducer accounting for 0.2wt% of the total weight of the base material, taking 0.1wt% of polypropylene fiber as an anticracking agent, taking 0.2wt% of a defoaming agent and 0.3wt% of a leveling agent, uniformly mixing, adding water accounting for 17wt% of the total weight of the base material, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for porcelain insulators.
When the adhesive is glued into a porcelain piece, steam curing is performed for 6 hours at the temperature of 40-50 ℃, the adhesive has excellent strength performance, the 3d compressive strength is 118.1MPa, the 3d flexural strength is 12.9MPa, the dry shrinkage is 0.02%, the elastic modulus is 47.2GPa, the 11d compressive strength is 122.9MPa, the flexural strength is 14.7MPa, the dry shrinkage is 0.04%, and the elastic modulus is 47.5GPa. In addition, the compression steaming expansion rate is-0.025%, the standard requirement is lower than 0.1%, the electromechanical breaking strength is 668MPa, and the breaking mode is foot length.
Example 5
The embodiment provides a cement adhesive, and the preparation method thereof is as follows:
1) The preparation method comprises the following steps of respectively weighing the preparation raw materials with corresponding mass according to the following mass percentage:
50wt% of silicate cement, 45wt% of artificial porcelain sand and 5wt% of high-purity spherical silica micropowder.
2) Uniformly mixing the weighed 60 weight percent of silicate cement, 30 weight percent of artificial porcelain sand and 10 weight percent of high-purity spherical silica micropowder to obtain a base material;
3) Adding a polycarboxylic acid compound water reducer accounting for 0.2wt% of the total weight of the base material, taking 0.1wt% of polypropylene fiber as an anticracking agent, taking 0.2wt% of a defoaming agent and 0.3wt% of a leveling agent, uniformly mixing, adding water accounting for 17wt% of the total weight of the base material, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for porcelain insulators.
When the adhesive is glued into a porcelain piece, steam curing is performed for 6 hours at the temperature of 40-50 ℃, the adhesive has excellent strength performance, the 3d compressive strength is 108.5MPa, the 3d flexural strength is 12.8MPa, the dry shrinkage is 0.02%, the elastic modulus is 47.8GPa, the 11d compressive strength is 123.8MPa, the flexural strength is 13.2MPa, the dry shrinkage is 0.04%, and the elastic modulus is 48.3GPa. In addition, the compression steaming expansion rate is-0.024%, is lower than the standard requirement and is less than 0.1%, the electromechanical breaking strength is 664MPa, and the breaking mode is foot length.
Example 6
The embodiment provides a cement adhesive, and the preparation method thereof is as follows:
1) The preparation method comprises the following steps of respectively weighing the preparation raw materials with corresponding mass according to the following mass percentage:
30wt% of silicate cement, 60wt% of artificial porcelain sand and 10wt% of high-purity spherical silica micropowder.
2) Uniformly mixing the weighed 60 weight percent of silicate cement, 30 weight percent of artificial porcelain sand and 10 weight percent of high-purity spherical silica micropowder to obtain a base material;
3) Adding 0.2wt% of polycarboxylic acid compound water reducer, 0.1wt% of polypropylene fiber serving as an anticracking agent, 0.2wt% of defoaming agent and 0.3wt% of leveling agent into the total weight of the base material, uniformly mixing, and then adding 16wt% of water into the total weight of the base material, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for porcelain insulators.
When the adhesive is glued into a porcelain piece, steam curing is performed for 6 hours at the temperature of 40-50 ℃, the adhesive has excellent strength performance, the 3d compressive strength is 123.8MPa, the 3d flexural strength is 142.2MPa, the dry shrinkage is 0.02%, the elastic modulus is 49.3GPa, the 11d compressive strength is 34.2MPa, the flexural strength is 9.8MPa, the dry shrinkage is 0.05%, and the elastic modulus is 49.9GPa. In addition, the compression steaming expansion rate is-0.023%, is lower than the standard requirement and is less than 0.1%, the electromechanical breaking strength is 682MPa, and the breaking mode is foot length.
Comparative example 1
This comparative example differs from example 1 only in that:
The artificial porcelain sand in example 1 was replaced with ordinary river sand;
Comparative example 2
This comparative example differs from example 1 only in that:
this comparative example replaces the high purity spherical silica fume of example 1 with a conventional silica fume having a purity of 92%.
Comparative example 3
This comparative example differs from example 1 only in that:
in this comparative example, the high-purity spherical fine silica powder of example 1 was replaced with a normal fine silica powder having a purity of 92%;
and the comparative example replaces the polyether modified silicone leveling agent of example 1 with a commercially available conventional leveling agent;
experimental part
The mechanical properties of the cement cements prepared in examples 1-6 and comparative examples 1-3 were tested, and the test results are shown in Table 1.
TABLE 1 mechanical test results of the cements prepared in examples 1-6 and comparative examples 1-3
Referring to the test results of table 1, it is known from comparative examples 1 to 6 and comparative example 1 that the cement cements for porcelain insulators prepared in examples 1 to 6 of the present invention have high compressive strength, flexural strength and rapid molding time, and can greatly improve the field turnover period of the product and greatly improve the production efficiency.
As is clear from the test results of comparative example 1 and example 1, the water addition amount for realizing self-leveling in comparative example 1 is 24% of the total amount of the base material, while the water addition amount in example 1 is 18%, the comprehensive performance of comparative example 1 is significantly lower than that of example 1, the 3d compressive strength is 88.5MPa, the 3d flexural strength is 8.9MPa, the dry shrinkage is 0.04%, the elastic modulus is 34.6GPa, the 11d compressive strength is 95.5MPa, the flexural strength is 11.4MPa, the dry shrinkage is 0.09%, and the elastic modulus is 37.2GPa. Compared with the 11d performance of example 1, the 11d compressive strength is reduced by 29.1MPa, the flexural strength is reduced by 5.2MPa, but the elastic modulus of 11d is reduced by 7.2MPa, and the dry shrinkage is increased by 0.03%. In addition, the compression steaming expansion rate is-0.032, which is lower than the standard requirement of 0.1 percent, the electromechanical breaking strength is 638MPa, and the breaking modes are foot lengths.
As is clear from the results of the tests of comparative example 2 and example 1, the total amount of water added for self-leveling in comparative example 2 was 24%, the total amount of water added in example 1 was 18%, the combination property of comparative example 2 was significantly lower than that of example 1, the 3d compressive strength was 92.5MPa, the 3d flexural strength was 11.2MPa, the dry shrinkage was 0.04%, the elastic modulus was 36.8GPa, the 11d compressive strength was 105.2MPa, the flexural strength was 12.6MPa, the dry shrinkage was 0.08%, and the elastic modulus was 37.1GPa. Compared with the 11d performance of example 1, the 11d compressive strength is reduced by 19.4MPa, the flexural strength is reduced by 3.1MPa, but the elastic modulus of 11d is reduced by 5.0MPa, and the dry shrinkage is increased by 0.02%. In addition, the compression steaming expansion rate is-0.028%, the standard requirement is lower than 0.1%, the electromechanical breaking strength is 657MPa, and the breaking mode is foot length.
As is clear from the results of the tests of comparative example 3 and example 1, the total amount of water added for achieving self-leveling in comparative example 3 was 25%, the water added in example 1 was 18%, the overall properties of comparative example 3 were significantly lower than those of example 1, the 3d compressive strength was 82.3MPa, the 3d flexural strength was 7.6MPa, the dry shrinkage was 0.05%, the elastic modulus was 32.4GPa, the 11d compressive strength was 88.5MPa, the flexural strength was 7.8MPa, the dry shrinkage was 0.09%, and the elastic modulus was 32.6GPa. Compared with the 11d performance of example 1, the 11d compressive strength is reduced by 36.1MPa, the flexural strength is reduced by 9.5MPa, but the elastic modulus of 11d is reduced by 9.5MPa, and the dry shrinkage is increased by 0.03%. In addition, the compression steaming expansion rate is-0.028%, the standard requirement is lower than 0.1%, the electromechanical breaking strength is 626MPa, and the breaking mode is foot length.
It should be apparent that the embodiments described above are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (9)
1. The self-leveling high-strength cement adhesive for the porcelain insulator is characterized by comprising a base material, an auxiliary agent and water, wherein the auxiliary agent is 0.1-1.4 wt% of the base material, and the water is 16-25 wt% of the base material;
wherein, the base material comprises the following components by mass percent:
40-60 wt% of Portland cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica micropowder, wherein the total amount of all preparation raw materials of the base material is 100wt%;
the auxiliary agent comprises a polycarboxylic acid compound water reducer, an anticracking agent, a defoaming agent and a leveling agent, wherein the leveling agent is polyether modified organic silicon;
The polyether modified organosilicon is prepared by the following steps:
s1, uniformly mixing polymethylhydrosiloxane and polyether F-6 to obtain a mixture A;
Wherein the mass ratio of the polymethylhydrosiloxane to the polyether F-6 is 1:1.8-2.2;
S2, uniformly dispersing a catalyst in the mixture A to obtain a mixture B;
s3, carrying out reflux heating treatment on the mixture B, introducing nitrogen when the temperature is raised to 78-82 ℃, then adding toluene, continuously raising the temperature to 105-115 ℃ for carrying out constant temperature reaction for 6-10 hours, and removing the toluene after the reaction is completed to obtain the polyether modified organosilicon;
the purity of the silicon micro powder is more than or equal to 99 percent, the silicon micro powder is spherical, and the particle size of the silicon micro powder is 10-200 nm;
the consumption of the leveling agent is 0.1-0.5 wt% of the base material.
2. The self-leveling high-strength cement adhesive for porcelain insulators according to claim 1, wherein the consumption of the polycarboxylic acid compound water reducer is 0.1-0.3 wt% of the base material;
The dosage of the anti-cracking agent is 0.1-0.3 wt% of the base material;
The consumption of the defoaming agent is 0.1-0.3 wt% of the base material.
3. The self-leveling high-strength cement adhesive for porcelain insulators according to claim 1, wherein the catalyst is an isopropanol solution of chloroplatinic acid, and the mass concentration of the chloroplatinic acid in the isopropanol solution is 1wt%;
And the mass ratio of the catalyst to the mixture A is 1.0-2.0 wt% 1.
4. The self-leveling high-strength cement paste for porcelain insulators according to claim 1, wherein a mass ratio of the toluene to the mixture B is 0.15-0.25:1.
5. The self-leveling high strength cement paste for porcelain insulators according to claim 1, wherein said Portland cement is 525#PItype or PItype cement;
The ceramic sand is ceramic sand with aluminum content more than or equal to 80%, and the grain size is 30-70 meshes.
6. The self-leveling high-strength cement adhesive for porcelain insulators according to claim 1, wherein the polycarboxylic acid compound water reducing agent is prepared by the following steps:
Mixing lithium salt into the polycarboxylic acid water reducer, and uniformly mixing to obtain the polycarboxylic acid compound water reducer;
The lithium salt is lithium nitrate or lithium carbonate, and the doping amount of the lithium salt is 15-25 wt% of the polycarboxylate water reducer.
7. The self-leveling high-strength cement adhesive for porcelain insulators according to claim 1, wherein the anticracking agent is polypropylene fiber, and the length of the polypropylene fiber is 5.5-6.56 mm, and the length-diameter ratio is 5-10.
8. The self-leveling high strength cement paste for porcelain insulators according to claim 1, wherein said defoaming agent is a hydrocarbon compound having a purity of not less than 98%.
9. A method of preparing a self-leveling high strength cement paste for porcelain insulators according to any one of claims 1-8, comprising the steps of:
Step 1, weighing the base material, the auxiliary agent and the water with corresponding mass according to the proportion for standby, wherein the base material is prepared from the following raw materials in percentage by mass:
40-60 wt% of Portland cement, 30-60 wt% of porcelain sand and 3-10 wt% of silica micropowder;
step 2, uniformly mixing the silicate cement, the porcelain sand and the silica micropowder to obtain a base material;
And step 3, uniformly mixing the base material and the auxiliary agent, adding water, and uniformly stirring to obtain the self-leveling high-strength cement adhesive for the porcelain insulator.
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| CN111592317A (en) * | 2020-06-11 | 2020-08-28 | 陕西拉发纪新材料科技有限公司 | Plastering gypsum mortar suitable for concrete buildings in open-pit coal mines and preparation method thereof |
| CN116425479A (en) * | 2023-03-17 | 2023-07-14 | 武汉理工大学 | A kind of cement adhesive and its preparation method and application |
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| JP6252230B2 (en) * | 2013-06-13 | 2017-12-27 | 宇部興産株式会社 | Self-leveling material |
| CN105585715A (en) * | 2016-03-03 | 2016-05-18 | 张耀忠 | Polyether modified organic silicon leveling agent |
| AU2020101096A4 (en) * | 2020-06-23 | 2020-07-23 | Qian’an Weisheng Solid Waste Environmental Protection Industrial co., LTD | The Preparation Method of Steel Fiber Reinforced Ultra-high Performance Concrete by Synergistic Utilization of Multi-solid Waste |
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| CN116425479A (en) * | 2023-03-17 | 2023-07-14 | 武汉理工大学 | A kind of cement adhesive and its preparation method and application |
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