JP2000072887A - Molding of cold-setting composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding method for a readily mold-releasable and cold- setting composition. SOLUTION: A hydrophilic polyalkyl methacrylate as a cold-setting agent is added to a mixture of a dry pulverized clay and an agricultural waste (rice bran, wheat bran, soybean flour and sawdust). The mixture is incorporated with water in an amount as small as possible to give a composition, which is further mixed with a small amount of an aqueous solution of a hydrophilic polymer such as CMC (methylcellulose) or poval (polyvinyl alcohol). The resulting matter is stirred, mixed, kneaded, compression molded and demolded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a room temperature curable composition, and more particularly to a method for molding a room temperature curable composition which can be easily released.

[0002]

2. Description of the Related Art The present application has been created based on the result of reexamination of Japanese Patent Application No. 156698 by the same applicant. That is, the gist of the application is to mix, mix, knead, mold and dry a mixture of clays and agricultural waste with a mixture of hydrophilic polyalkylarylmethacrylate (hereinafter referred to as PMAE) and water. In the past, agricultural waste was consumed in feed for livestock, fish farming, etc., but it is considered significant to use it as an industrial raw material with higher added value, and it is inexpensive as in the above-mentioned Patent Application No. 156698. It is an abundant raw material resource, has the advantage of being easy to manufacture, and has the advantage that disposables can be easily collapsed and returned to the earth by rainwater. As mentioned above, despite the fact that it seems to be meaningful for the company, it has been more than 10 years since the application for the same application, but it was questioned that the product described in the application was not found, and at the same time As a result of reviewing the manufacturing process, we acknowledged that there was a corporate problem in the molding process in the manufacturing process of the same application as described below.

[0003]

As described above, a molding experiment was conducted at room temperature for compositions using various curing agents based on the description of the same application, and as a result, a molded product (hereinafter referred to as a molded product) was obtained. Since the strength (hardness, impact strength) is the strongest when PMAE and water are used as the curing agent, the present application mainly conducts a molding experiment of a composition using PMAE and water as the curing agent. For the experiment, the molding machine used in this experiment used a golf tee mold shown in FIG. 1, and PMAE was 10 to 10 parts by weight of the raw material (described above) as a molding composition.
20 parts by weight and 20 to 40 parts by weight of water are used, and the composition is mixed, kneaded, compression-molded, and dried (cured) in a conventional manner.
Then, a process in which a strength comparison test of the molded body obtained after completing the entire process was performed by means shown in FIG. 2 was examined. The amount of water used is hereinafter referred to as equivalent (representing the amount of water used for 100 parts by weight of the raw material).

[0004] Generally, it is known in the production of water-containing products to use a raw material composition for a small amount of water as much as possible in a business.
In this experiment, when a molding test was conducted on a composition having a water content of 40 to 20 equivalents, it was found that the molding operation became more difficult as the amount of water added decreased. That is, the mold body became difficult to peel off from the mold surface. And when it is 20 equivalents or less, it was difficult to peel off the mold body from the mold surface, and the strength of the mold body obtained by dismantling the molded body tended to be weaker. From this fact, it is considered that about 20 equivalents of water are involved in the curing reaction due to the activity of water itself. From these results, even when the addition of water is as small as possible, the weight loss is estimated to be limited to about 25 equivalents. In any case, the molding operation becomes difficult as the amount of added water decreases. That is, it is difficult for the mold body to be separated from the mold surface. The cause was considered as follows. As described above, P in the composition
MAE is presumed to be superior in electronegativity from the viewpoint of organic chemical structure as shown below.

[0005]

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[0006] As described above, PMAE is considered to be superior in electronegativity. On the other hand, the mold surface is made of chrome steel and the metal surface is considered to be electrically positive in the same manner as ordinary metals, so that PMAE is considered to be a mold body. It was presumed that the adhesive strength based on these reciprocal electric degrees between the mold surface and the mold surface made it difficult for the molded body to peel off from the mold surface. From the above, if the content of water is reduced by the content ratio of PMAE as a curing agent and water in the composition as in the present application, it is difficult to mold the composition due to the electronegative nature of the chemical structure of PMAE. PM from the idea of doing
It is an object of the present application to try to solve how to alleviate or mitigate the effects of AE.

[0007]

As described above, in the present application, when the water content in the raw material composition components is reduced as much as possible, the core molding operation in the manufacturing process is inversely proportional when the water content is reduced. The main reason that the molding operation is difficult is presumed to be that the electronegativity is superior due to the chemical structure of PMAE as a curing agent. Considering the addition of a compound having an electropositive chemical structure, or physically diluting with a solvent, the hydrophilic polymers CMC (methylcellulose), poval (polyvinyl alcohol),
Each aqueous solution or the hydrophilic low-boiling organic compounds acetone and methanol were selected (otherwise, a heating method could be considered, but this was omitted from the present application because the operation would be more complicated). Hereinafter, each of these will be described.

[0008]

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[0009] Since each of the above compounds is an electropositive compound in terms of chemical structure, it may be considered that the compound acts to neutralize the electronegative property of PMAE and neutralizes the action. Acetone and methanol may chemically suppress the action of PMAE due to the degree of electrical positivity as described above, and at the same time, physically dilute these to slow down the action of PMAE. Since these have a low boiling point, for example, when water and acetone coexist, the vapor pressure of these components exists as described below, so they adhere to the contact surface between the mold body and the mold surface due to the presence of these vapor pressures. It is considered that the force becomes slow, which contributes to facilitating peeling of the mold body from the mold surface. The difference between acetone and methanol from water is that the more the amount of water, the easier it is to mold, but the obtained molded body becomes more brittle and, for example, it is difficult to move in the next drying step. However, these are easily dissipated due to the low boiling point, and have a considerable strength without substantially affecting the strength of the obtained mold.
You can move. Next, the physical properties of acetone and methanol are shown.

[0010]

[Table 1]

From the above physical property tables, these solvents are not only chemically diluted but also physically diluted, and the adhesive strength between the PMAE and the mold surface is predominantly restricted or regulated. We considered that it contributed to ease. From the above, as a room temperature curing agent for clays and agricultural wastes, which is the gist of the present application, PMAE and a small amount of CMC by reducing the water content as much as possible,
Add a poplar aqueous solution or a small amount of acetone, methanol, or a mixture of acetone and methanol and mix and knead at room temperature.
We believe that the manufacturing process for molding and drying (curing) products can be recommended by companies.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of the first to fifth embodiments, the structure of a split mold will be described with reference to FIG. 1, and an apparatus for comparing and measuring the impact force of a molded body obtained by the split mold will be described. Will be described with reference to FIG. As shown in FIG. 1, the split mold is stacked with the split mold upper section 1, the split mold middle section 6, and the split mold lower section 10 brought into contact with the joining surface lines 5 and 8. Consisting of In each of these portions, the material charging guide cylinder 2, the mold cavity 7, and the small hole portion 11 are formed so as to communicate with each other. A pressing rod 3 having a pressing rod compression plate 4 at the tip is slidably inserted into the raw material charging guide cylinder 2. The mold cavity 7 is filled with a sample to be molded, and a discharge rod 12 is inserted into the small hole 11 of the lower part 10 of the split mold. Further, the split mold middle section 6 is divided into two by a joining surface line 9. A through hole 15 is formed through the split mold,
Each part is fixed so as not to be separated by a fastening fixing rod 13 penetrating the through hole 15 and a fixing nut 14 screwed to the fixing rod 13 to be integrated.

[0013] As shown in FIG.
Numeral 6 includes an outer column 22 forming a sample insertion hole 17 and a shock-measurement cavity 18, a measurement weight 19 inserted into the shock-measurement cavity 18, and the like. The measuring weight 19 is made of, for example, a 50 g weight body, and is supported by a weight supporting cord 20 wound around the guide roller 21. Sample 2
4 is inserted into the sample insertion hole 17, the measuring weight 19 is positioned at an appropriate position on the drop support scale 23, and the impact strength of the sample 24 can be determined by dropping it.

(Example 1) Dried fine powder kaolin5.
Take 5 g of dry fine powder Nuka 4.5 g in the mortar as well as 5 g,
1.5 g of PMAE (LW239 Mitsubishi Rayon KK) was added to the well-stirred and mixed mixture, kneaded, and then 2.0 g of water was added. The mixture was kneaded again, and then the CMC solution (2
%) And further sufficiently kneaded, and charged while compressing it with a small rod little by little through a raw material charging guide cylinder 2 of FIG. 1 of a split mold, and filling almost to the upper part 1 of the split mold. After that, the body is pressed with the pressing rod 3 and pressed. After sufficiently pressing, the split mold lower part 11 is fixed while the split mold is fastened and fixed.
When the discharge extruding rod 12 is inserted into the small hole portion 11 and pressed backward, the mold body is peeled off from the upper portion 1 of the split mold and extruded.
The obtained mold is carefully moved to the next process place, dried (at room temperature) and left at room temperature for about 3 days to be cured at room temperature to obtain a product. The hardness of the obtained molded body is not damaged by the gypsum body, and the strength is determined by the impact strength of the impact force comparison measuring device 16 (FIG. 2). Using the same device 16, a 50 g measuring weight 19 is used to drop the scale 10
cm, and the degree of crushing of the tip of the mold body of the test specimen was compared. (A) The key in this state can be pierced into the soil surface. (B) Next, when the mold is put into water, it starts to disintegrate in about half a day.

(Example 2) 5 g of dried fine powdered acid clay
Put 5g of dried fine powder in a mortar and stir.
Mix, add 1.5 g of PMAE, stir and mix again so that PMAE is uniformly diffused, add 1.0 g of povar aqueous solution (3%) separately prepared, and further add 2.0 g of water to the mixture. The kneaded material is subjected to compression filling in the raw material charging guide cylinder 2 of the split mold shown in FIG. Thus, the mold body is taken out of the split mold by back-pressing from the lower section 10 of the split mold with the discharge pressing rod 12, and dried at room temperature for 3 days. The strength of this product was almost a standard value.

Example 3 5.5 g of dry fine powder diatomaceous earth and 4.5 g of dry fine powder Nuka were placed in a mortar, and a mixture obtained by stirring and mixing 1.5 g of acetone and 1.5 g of PMAE dissolved therein was added. The mixture was stirred and mixed, and 2.0 g of water was further added. The mixture was sufficiently stirred and kneaded, and a molding test was performed according to a conventional method. The obtained molded product after standing for 3 days after drying had almost the standard strength and impact strength.

(Example 4) 5.5 g of dry fine powder kaolin
And 4.5 g of dry fine powder Nuka were mixed into a milk and mixed, and PMAE was added to a mixture of 1 g of acetone and 0.5 g of methanol.
A solution in which 1.5 g was dissolved was added, stirred and mixed, and 2.0 g of water was further added, followed by sufficiently stirring and kneading. A molding experiment was carried out on the kneaded material according to a conventional method. About the obtained molded body, the molding state is the same as in all the previous examples,
The hardness and impact strength of the obtained molded body were hardly changed.

(Example 5) 5.5 g of dry fine powder kaolin
Similarly, 4.5 g of dried fine powder Nuka was placed in a mortar, mixed with 1.5 g of PMAE, sufficiently stirred and kneaded, added with 2.5 g of water, and molded by stirring and kneading according to a conventional method. However, molding was not successful in this case. That is, at the end of the same operation, it was impossible to try to extrude the mold body by reversely pressing the discharge rod 12 from the small hole portion 11 of the split type mold. For this purpose, the split mold was separated and an attempt was made to separate the mold body from the mold section. However, the mold could not be easily separated and was extruded with another cut rod. However, the obtained mold was almost the same as described above.
However, this embodiment is significantly different from the molding operation of the present embodiment.

[0019]

According to the present invention, the adhesive strength between the mold and the mold is reduced, the peeling from the mold is facilitated, and the mold of good quality is smoothly and reliably produced. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a split mold for molding a golf tee used in the embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a schematic structure of an impact force comparison measuring device for measuring the strength of a molded mold body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Split type | mold upper part of a part 2 Raw material charging induction | guidance | derivation cylinder 3 Pressing rod 4 Pressing rod compression part 5 Joining surface line of a split type | mold upper part and a split mold | die middle part 6 Split type | mold middle part 7 Split type die Mold cavity in middle part 8 Joint surface line between middle part of divided mold and lower part of divided mold 9 Joint surface line 10 Lower part of divided mold 11 Small hole 12 Discharge extrusion rod 13 Fastening fixing rod 14 Fixed Nut 15 Through hole 16 Impact force comparison and measurement device 17 Sample insertion hole 18 Impact measurement inner cavity 19 Measurement weight 20 Weight support cord 21 Guide roller 22 Outer column 23 Drop indication scale 24 Sample

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08L 33/12 C08L 33/12 99/00 99/00 // B29K 103: 00 F term (reference) 4F071 AA09 AA29 AA33 AA73 AB30 AC05 AC07 AF52 AH19 BB03 4F204 AA01 AA19 AA21 AA50 AB16 AB19 AC04 FA01 FB01 FF01 FN20 4J002 AB033 AH00W BE023 BG05X DE027 DJ036 EC038 EE038 FD01W FD016

Claims (2)

[Claims] 1. A method comprising adding a hydrophilic alkyl polymethacrylate as a room temperature curing agent to a mixture of dried and finely divided clays and agricultural waste (Nuka, bran, soybean powder, sawdust). A small amount of hydrophilic polymer CMC (methylcellulose) or a composition containing a very small amount of water, or
Add an aqueous solution of poval (polyvinyl alcohol),
A method for molding a room-temperature curable composition, characterized in that a mixture obtained by stirring, mixing and kneading them is compression-molded and released. 2. A composition comprising a hydrophilic polymethalkylester as a room-temperature curing agent and a minimum amount of water attached to a composition containing a small amount of hydrophilic, low-boiling compounds acetone, methanol,
2. The method of molding a room-temperature curable composition according to claim 1, wherein a mixture of acetone and methanol is attached, and the mixture is stirred, mixed, and kneaded, and then compression-molded and released.