CN114211903B

CN114211903B - High-heat-conductivity silica gel embossing roller and preparation method thereof

Info

Publication number: CN114211903B
Application number: CN202111606830.5A
Authority: CN
Inventors: 张义; 李超; 高金岗; 高义辉
Original assignee: Suzhou Greentech Co ltd
Current assignee: Suzhou Rui High Tech Materials Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2023-08-15
Anticipated expiration: 2041-12-27
Also published as: CN114211903A

Abstract

The application relates to the technical field of rubber rollers, and particularly discloses a high-heat-conductivity silica gel embossing roller and a preparation method thereof. The high-heat-conductivity silica gel embossing roller sequentially comprises a roller core, an adhesive layer and a silica gel layer from inside to outside; the silica gel layer is prepared from the following raw materials: the heat-conducting resin comprises liquid silica gel, a curing agent, a first heat-conducting filler, a second heat-conducting filler and pigment. The preparation method of the high-heat-conductivity silica gel embossing roller comprises the following steps: mixing and grinding raw materials of the silica gel layer to prepare composite liquid silica gel; coating the composite liquid silica gel on an original mold with patterns, and curing at room temperature to obtain a silica gel layer; coating an adhesive layer on the silica gel layer to obtain a silica gel sleeve; and sleeving the silica gel sleeve on the roller core, and heating to obtain the high-heat-conductivity silica gel embossing roller. According to the application, the liquid silica gel and the two heat conducting materials are compounded, and the synergistic effect of the liquid silica gel and the two heat conducting materials improves the heat conductivity of the silica gel embossing roller, and meanwhile, the heat conducting embossing roller has good heat resistance and wear resistance.

Description

High-heat-conductivity silica gel embossing roller and preparation method thereof

Technical Field

The application relates to the technical field of rubber rollers, in particular to a high-heat-conductivity silica gel embossing roller and a preparation method thereof.

Background

The rubber roller is a roller-shaped product which is made by taking metal or other materials as a core and vulcanizing rubber covered outside, and generally consists of outer rubber, a hard rubber layer, a metal core, a roller neck and a vent hole, and the processing comprises the working procedures of roller core sand blasting, bonding treatment, rubberizing molding, surface processing and the like. The rubber roller is mainly applied to the aspects of papermaking, printing and dyeing, printing, grain processing, metallurgy, plastics and the like.

When the embossing roller is manufactured by combining the rubber roller and the embossing texture, the embossing roller not only has excellent elasticity and mechanical strength of the rubber roller, but also can be used for extruding beautiful patterns and designs on various materials; but the embossing roller has poor heat conductivity and short service life, and is only suitable for manufacturing products with rough textures and low requirements on external textures.

With respect to the related art as described above, the inventors considered that the embossing roll had a problem of poor heat conductivity, thereby limiting its development and use.

Disclosure of Invention

In order to improve the heat conductivity of the embossing roller, the application provides a high-heat-conductivity silica gel embossing roller and a preparation method thereof.

In a first aspect, the application provides a high-heat-conductivity silica gel embossing roller, which adopts the following technical scheme:

the high-heat-conductivity silica gel embossing roller sequentially comprises a roller core, an adhesive layer and a silica gel layer from inside to outside; the silica gel layer is prepared from the following raw materials in parts by weight: 90-110 parts of liquid silica gel, 6-12 parts of curing agent, 20-40 parts of first heat conducting filler, 20-40 parts of second heat conducting filler and 1-3 parts of pigment.

Through adopting above-mentioned technical scheme, liquid silica gel has excellent tear resistance degree, thermal stability and heat-resisting ageing resistance etc. through the synergism of first heat conduction filler and second heat conduction filler, improve the coefficient of heat conduction of both and the heat conduction silica gel cover of liquid silica gel preparation, reuse adhesive is bonded heat conduction silica gel cover and roller core, the high heat conduction silica gel embossing roller of making not only has higher heat conductivility, simultaneously has good wear resistance and heat resistance, the life of roller has been prolonged, the unable difficult point that realizes accurate texture replication of ordinary silica gel roller has been solved, the heat conduction is good, the texture is finalized in the twinkling of an eye, production efficiency has been improved.

Optionally, the liquid silica gel is RTV addition type room temperature vulcanized silicone rubber.

By adopting the technical scheme, the RTV addition type room temperature vulcanized silicone rubber has good heat resistance, hydrophobicity and electrical insulation, and meanwhile, due to the introduction of the active end groups, the RTV addition type room temperature vulcanized silicone rubber has excellent physical and mechanical properties, particularly has obvious advantages in tensile strength, relative elongation and tearing strength, and can be added into an embossing roller to improve the heat resistance and mechanical strength of the embossing roller.

Optionally, the first heat conductive filler is alumina powder; the second filler is diamond powder; the average particle size of the alumina powder and the diamond powder is 20-50 mu m.

By adopting the technical scheme, the micron-sized alumina and the diamond are used as good heat conduction materials, and the alumina has the advantages of uniform particle size distribution, high purity, excellent dispersion, high surface area and high temperature resistance and inertness; the diamond has the characteristics of high hardness, high compressive strength, good wear resistance and the like; under the synergistic effect, the heat conducting silica gel sleeve has good heat conductivity and can improve the wear resistance of the heat conducting silica gel sleeve.

Optionally, the thickness of the silica gel layer is 1-3mm.

Through adopting above-mentioned technical scheme, optimize the thickness of silica gel layer, be favorable to improving the thermal conductivity and the wearability of silica gel layer.

Optionally, the roller core is a steel core with the surface being subjected to sand blasting treatment and the wall thickness being 10-15 mm.

By adopting the technical scheme, on one hand, the surface of the roller core is treated by sand blasting, so that the surface of the roller core obtains a certain cleanliness and different roughness, and the mechanical property of the surface of the roller core is improved; on the other hand, the roller core is made of steel, and has stronger mechanical strength.

Optionally, the adhesive layer is a single-component room temperature curing adhesive.

By adopting the technical scheme, the single-component room-temperature curing adhesive can accelerate the curing process by slight heating, and a firm and dry surface is formed after curing, so that the adhesive has excellent wear resistance, and the silica gel sleeve and the roller core are better bonded together.

Optionally, the thickness of the adhesive layer is 0.1-0.3mm.

By adopting the technical scheme, the thickness of the bonding layer is optimized, and the bonding property of the roller core and the silica gel layer is improved.

Optionally, the curing agent is one of dibutyl tin dilaurate and stannous octoate.

By adopting the technical scheme, when the addition type room temperature vulcanized silicone rubber is used, under the catalysis of dibutyltin dilaurate or stannous octoate, the dealcoholization condensation reaction effect between the silicone rubber containing terminal hydroxyl and the polysiloxane containing hydride function can be improved, so that the silicone sleeve has good mechanical strength and weather resistance.

In a second aspect, the application provides a preparation method of a high-heat-conductivity silica gel embossing roller, which adopts the following technical scheme:

the preparation method of the high-heat-conductivity silica gel embossing roller comprises the following steps:

s1, weighing a raw material formula of a silica gel layer, mixing to form a mixture after weighing, and grinding the mixture to obtain composite liquid silica gel; coating the composite liquid silica gel on an original mold with patterns, and curing at room temperature to obtain a silica gel layer;

s2, coating an adhesive layer on the silica gel layer to obtain a silica gel sleeve;

and S3, sleeving the silica gel sleeve on the roller core, and heating to obtain the high-heat-conductivity silica gel embossing roller.

By adopting the technical scheme, the preparation method of the high-heat-conductivity silica gel embossing roller is simple and reliable, is suitable for large-scale production, and the prepared high-heat-conductivity silica gel embossing roller has excellent heat-conducting performance and excellent wear resistance, and the service life of the roller is prolonged; the roller has good heat conduction effect, plays a key role in instant shaping, and is beneficial to production speed and texture details.

Optionally, in the step S3, the heating temperature is 70-90 ℃ and the heating time is 5-7h.

By adopting the technical scheme, the heating temperature and the heating time are optimized, and the high-heat-conductivity silica gel embossing roller is favorable for better preparation.

In summary, the present application has at least one of the following advantages:

1. according to the application, the liquid silica gel with excellent mechanical properties and the heat-conducting filler with good heat conductivity are compounded, and through the synergistic effect of the liquid silica gel and the heat-conducting filler, the heat conductivity coefficient of the embossing roller is improved, and meanwhile, the embossing roller has good wear resistance and heat resistance;

2. according to the application, the liquid silica gel is compounded with the addition type RTV room temperature vulcanized silicone rubber through the synergistic effect of the aluminum oxide and the diamond, and the obtained silica gel sleeve has better heat conduction effect and wear resistance effect, so that the service life of the embossing roller is prolonged;

3. the bonding layer is a single-component room temperature curing adhesive, and a firm and dry surface is formed after the curing process is accelerated by slight heating, so that the bonding layer has excellent wear resistance; the bonding property between the roller core and the silica gel layer can be improved;

4. according to the application, the curing agent is added into the silica gel layer, so that the vulcanization effect of the addition type RTV room temperature vulcanized silicone rubber is improved, and the heat resistance of the silica gel layer is further improved.

Detailed Description

The present application will be described in further detail with reference to examples.

Among the relevant raw materials used in the examples:

RTV addition room temperature vulcanized silicone rubber 4670A:4670 b=10:1 two-component addition type room temperature vulcanized silicone rubber; the model of dibutyl tin dilaurate is: SH-164726; stannous octoate with the brand number of T-19 and the tin content of 28-33.5 percent; the pigment is ferric oxide, but is not limited to the ferric oxide; the single-component room temperature curing adhesive is purchased from dakangnin and has the model number of: 1-2577.

Examples 1 to 10

As shown in Table 1, the main difference between examples 1-10 is the different ratios of the raw materials of the silica gel layers.

The following description will take example 1 as an example. The embodiment discloses a high-heat-conductivity silica gel embossing roller, which comprises a roller core, an adhesive layer and a silica gel layer which are bonded together from inside to outside, wherein the roller core is a steel core with the surface being subjected to sand blasting treatment and the wall thickness being 10 mm; the adhesive layer is composed of single-component room temperature curing adhesive, and the thickness is 0.1mm; the thickness of the silica gel layer is 1mm, and the silica gel layer is prepared by mixing the following raw materials: 100kg of RTV-addition type room temperature vulcanized silicone rubber, 6kg of dibutyltin dilaurate, 20kg of aluminum oxide powder, 20kg of diamond powder and 1kg of pigment.

The embodiment also discloses a preparation method of the high-heat-conductivity silica gel embossing roller, which specifically comprises the following steps:

s1, weighing and mixing raw materials of a silica gel layer according to a formula, and grinding by a grinder to ensure that all components are completely fused to prepare the composite liquid silica gel; uniformly coating the composite liquid silica gel on an original mold with patterns, and curing for 24 hours at room temperature to obtain a silica gel layer;

s2, uniformly coating single-component room temperature curing glue on the silica gel layer, and curing for 2 hours at room temperature to obtain a silica gel sleeve;

s3, sleeving the silica gel sleeve on the iron steel core subjected to sand blasting treatment, and preparing the high-heat-conductivity embossing roller under the condition that the heating temperature is 70 ℃ and the heating time is 7 hours.

Table 1 raw material ratios of the silica gel layers in examples 1 to 10

Example 11

This embodiment is substantially the same as embodiment 1 except that: the wall thickness of the rigid core is 15mm, the thickness of the adhesive layer is 0.3mm, and the thickness of the silica gel layer is 3mm.

Example 12

This embodiment is substantially the same as embodiment 1 except that: in the raw material composition of the silica gel layer, stannous octoate is used for replacing dibutyltin dilaurate.

Example 13

This embodiment is substantially the same as embodiment 1 except that: in the preparation method, in the step S3, the heating temperature is 90 ℃, and the heating time is 5 hours.

Comparative example 1

This comparative example differs from example 1 in that: the embossing roller is formed by directly laminating a roller core and an original mould with patterns through an adhesive layer.

Comparative example 2

This comparative example differs from example 1 in that: the diamond powder was replaced with alumina powder.

Comparative example 3

This comparative example differs from example 1 in that: the alumina powder was replaced with diamond powder.

Performance test

The same weight of the synthetic leather obtained in examples 1 to 13 was used as the test sample 1 to 13, and the same weight of the synthetic leather obtained in comparative examples 1 to 3 was used as the control sample 1 to 3. The test samples and the control samples were subjected to performance test, and the results are shown in Table 2.

1. Coefficient of thermal conductivity

Placing the sample between two parallel surfaces that are isothermal, a thermal gradient being applied to the sample by the temperature difference of the two contact surfaces, resulting in the passage of a heat flow through the sample, the heat flow passing vertically and uniformly through the test surface while ensuring no lateral heat transfer, characterized by a surface thermal conductivity, reference standard: ASTM D5470.

2. Heat resistance

Characterized by the rate of change of hardness properties, reference standard GB/T3512-2001; the test time was 24 hours, and the sample was carried out under normal pressure.

3. Wear resistance

Abrasion resistance test: the number of rubs was recorded as a characterization, specifically with a dedicated rubber with a hardness of 50 degrees rubbing the surface of the test specimen, and with the surface texture clearly visible as a standard.

Table 2 table of performance test data

Referring to table 2, in combination with example 1 and comparative example 1, it can be seen that the thermal conductivity, heat resistance and abrasion resistance of the test specimen formed by bonding the roll core and the patterned master mold together through the adhesive layer were inferior to those of the test specimen formed by bonding the silicone layer-coated master mold and the roll core together through the adhesive layer. Description: by adopting the silica gel layer, the heat conductivity of the high heat conduction silica gel embossing roller can be greatly increased, and meanwhile, the high heat conduction silica gel embossing roller has excellent heat resistance and wear resistance, and further the service life of the high heat conduction silica gel embossing roller is prolonged.

Referring to Table 2, in combination with examples 1 to 3, it can be seen that the heat resistance and abrasion resistance of the test sample are improved to different extents with increasing addition of RIV addition type room temperature vulcanized silicone rubber; the RIV addition type room temperature vulcanized silicone rubber has high mechanical strength and good heat resistance, and can be deeply vulcanized, so that the formed silicone layer has excellent heat resistance and wear resistance, and further the heat resistance and wear resistance of the high-heat-conductivity silicone embossing roller are improved.

Referring to table 2, in combination with examples 2, 4 and 5, it can be seen that with increasing addition of dibutyltin dilaurate, both the abrasion resistance and heat resistance of the test sample are improved, since the addition of dibutyltin dilaurate to the silicone layer improves the vulcanization effect of the RIV-addition type room temperature vulcanized silicone rubber itself, so that the heat resistance and mechanical properties of the formed silicone layer are better, and the heat resistance and abrasion resistance of the high thermal conductivity silicone embossing roller are further improved.

Referring to table 2, in combination with examples 4, 6, 7 and comparative examples 2 and 3, it can be seen that with increasing alumina powder content in the silica gel layer, the thermal conductivity of the test sample has a significant tendency to rise, and both the heat resistance and the wear resistance of the test sample are improved; the alumina powder is added into the silica gel layer, has high wear-resistant effect, uniform particle size distribution, excellent dispersion, high specific surface, high temperature-resistant inertia and high hardness, and improves the comprehensive performance of the silica gel layer. However, when the diamond in the silica gel layer is replaced with the alumina powder or the alumina is replaced with the diamond powder, that is, alumina or diamond is added to the silica gel layer as the only heat conductive filler, the heat conductivity of the sample is reduced because the alumina and the diamond have a synergistic effect, and the effect of adding the alumina and the diamond together is due to the effect of adding the alumina and the diamond separately.

Referring to table 2, in combination with examples 6, 8 and 9, it can be seen that as the silica gel layer diamond powder is increased, the thermal conductivity, heat resistance and abrasion resistance of the test pieces are improved; the diamond not only has excellent heat conductivity, but also has high hardness, good wear resistance and high heat stability, so that the heat conductivity, heat resistance and wear resistance of the high-heat-conductivity silica gel embossing roller are improved.

Referring to table 2, in combination with examples 8 and 10, it can be seen that an appropriate amount of iron oxide was added as a pigment to the silicone layer to provide a good modification of the color of the high thermal conductivity silicone embossing roll, but had substantially no effect on the thermal conductivity, heat resistance and abrasion resistance of the high thermal conductivity silicone embossing roll, i.e., the test pieces still had excellent properties.

Referring to table 2, in combination with examples 1 and 11, it can be seen that the obtained test pieces still have excellent thermal conductivity, heat resistance and abrasion resistance by changing the thickness of the silicone layer, the thickness of the roll core wall, and the thickness of the adhesive layer within appropriate ranges.

Referring to table 2, in combination with examples 1 and 12, it can be seen that substitution of dibutyl dilaurate for stannous octoate in the silica gel layer resulted in better curing of RIV-addition type room temperature vulcanized silicone rubber and thus better heat resistance and abrasion resistance of the formed silica gel layer due to better catalytic effect of stannous octoate on RIV-addition type room temperature vulcanized silicone rubber.

Referring to table 2, in combination with examples 1 and 13, it can be seen that the prepared test has excellent properties by properly adjusting the heating time and heating temperature in the preparation method.

The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims

1. The utility model provides a high heat conduction silica gel embossing roller which characterized in that: the roller core, the adhesive layer and the silica gel layer are sequentially included from inside to outside; the silica gel layer is prepared from the following raw materials in parts by weight: 90-110 parts of liquid silica gel, 6-12 parts of curing agent, 20-40 parts of first heat conducting filler, 20-40 parts of second heat conducting filler and 1-3 parts of pigment;

the liquid silica gel is RTV addition type room temperature vulcanized silicone rubber; the first heat conducting filler is alumina powder; the second heat conduction filler is diamond powder;

the curing agent is one of dibutyl tin dilaurate and stannous octoate.

2. The high thermal conductivity silicone embossing roller as set forth in claim 1, wherein: the curing agent is stannous octoate, and the tin content is 28-33.5%.

3. The high thermal conductivity silicone embossing roller as set forth in claim 1, wherein: the average particle size of the alumina powder and the diamond powder is 20-50 mu m.

4. The high thermal conductivity silicone embossing roller as set forth in claim 1, wherein: the thickness of the silica gel layer is 1-3mm.

5. The high thermal conductivity silicone embossing roller as set forth in claim 1, wherein: the roller core is a steel core with the surface being subjected to sand blasting treatment and the wall thickness being 10-15 mm.

6. The high thermal conductivity silicone embossing roller as set forth in claim 1, wherein: the adhesive layer is a single-component room temperature curing adhesive.

7. The high thermal conductivity silicone embossing roller as set forth in claim 6, wherein: the thickness of the adhesive layer is 0.1-0.3mm.

8. The method for preparing the high thermal conductivity silica gel embossing roller as claimed in any one of claims 1 to 7, characterized in that: the method comprises the following steps:

9. The method of preparing a high thermal conductivity silicone embossing cylinder as set forth in claim 8, wherein: in the step S3, the heating temperature is 70-90 ℃ and the heating time is 5-7h.