Method for producing methacrylate ester resin forms

A technology of methacrylic acid and resin moldings, applied in the fields of methacrylic resin moldings and methyl methacrylate pastes, which can solve the problem of giving target shapes, difficulty in softening methacrylic resin moldings, and easy foaming and other problems, to achieve the effect of easy thermoforming

Inactive Publication Date: 2006-08-16
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this methacrylic resin molded article usually absorbs water easily, and if the methacrylic resin molded article that absorbs water during storage is heat-molded, it is easy to foam.
[0004] Hitherto, as a method for producing a methacrylic resin molded body that is difficult to foam even if it absorbs water, a method of pouring a methyl methacrylate-based paste containing a crosslinking agent is known (Patent Document 1: Japanese Patent Application Laid-Open No. 60-144312), but it is difficult to soften the methacrylic resin molded body obtained by this method even if it is heated, and it is difficult to give the target shape by thermoforming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 0.002 parts by mass (20 ppm) of 2,2'-azobisisobutyronitrile to 100 parts by mass of methyl methacrylate, and polymerize it at 70°C to obtain a polymer with a viscosity-average molecular weight of 1.5 million containing 5% by mass. part of the polymer. Mix 15 parts by mass of this part of the polymer with 85 parts by mass of methyl methacrylate, then add 0.08 parts by mass (800ppm) of 2,2'-azobisisobutyronitrile, 0.06 parts by mass (600ppm) of 1-dodecane mercaptan, 0.01 parts by mass (100 ppm) of cyclohexane-1-methyl-4-ethylene, 0.01 parts by mass (100 ppm) of an ultraviolet absorber (manufactured by Sumitomo Chemical, "Sumin 200"), and 0.01 parts by mass (100 ppm) a release agent (manufactured by Toho Chemical Co., Ltd., "FOOSFANOL RS-710") was mixed and degassed to obtain a methyl methacrylate paste.

[0045] The above-obtained methyl methacrylate paste was poured into an element consisting of a gasket made of vinyl chloride resin and two flat glass plates arrange...

Embodiment 2

[0048] Except having made the usage-amount of 1-dodecylmercaptan into 0.09 mass part (900ppm), it carried out similarly to Example 1, the methyl methacrylate type paste was obtained, and the methacrylic resin plate was obtained. Table 1 shows the evaluation results of the methacrylic resin board.

[0049] Except that the methacrylic resin plate obtained above was used instead of the methacrylic resin plate obtained in Example 1, it can be easily shaped according to the molding die by performing the same operation as in Example 1, and the obtained secondary molded product is also Few bubbles were found.

Embodiment 3

[0051] Except having made the usage-amount of 1-dodecylmercaptan into 0.3 mass parts (3000ppm), it carried out similarly to Example 1, the methyl methacrylate type paste was obtained, and the methacrylic resin plate was obtained. Table 1 shows the evaluation results of the methacrylic resin board.

[0052] Except that the methacrylic resin plate obtained above was used instead of the methacrylic resin plate obtained in Example 1, it can be easily shaped according to the molding die by performing the same operation as in Example 1, and the obtained secondary molded product is also Few bubbles were found.

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Abstract

The invention provides: (1) a method for manufacturing methacrylate resin molded body, which is characterized in that a methacrylate resin paste containing polymerization initiator 100 to 5,000 ppm, alkyl sulfhydrate 500 to 3,500 ppm and terpenoid 50 to 150 ppm is injected into an element and polymerized; (2) a method for manufacturing methacrylate resin secondary molded body, which is characterized in that the slab-shaped methacrylate resin molded body obtained by the manufacture method recorded in (1) is subjected to thermoforming; (3) a methacrylate resin molded body, which is characterized in being formed by injecting methacrylate resin paste containing polymerization initiator 100 to 5,000 ppm, alkyl sulfhydrate 500 to 3,500 ppm and terpenoid 50 to 150 ppm and polymerized; and (4) a methacrylate resin paste containing polymerization initiator 100 to 5,000 ppm, alkyl sulfhydrate 500 to 3,500 ppm and terpenoid 50 to 150 ppm.

Description

technical field [0001] The present invention relates to a methacrylic resin molded article, a method for producing the same, and a methyl methacrylate paste used in the production method. Background technique [0002] The so-called cast polymerization method, in which a methyl methacrylate-based paste containing a polymerization initiator is injected into the device to polymerize it, is widely known as a method for producing methacrylic resin molded articles, and plate-shaped methacrylic resin molded articles are produced by this method. Thereafter, it is heated to soften it, shaped according to a molding die, and a method of producing a methacrylic resin secondary molded body by this thermoforming method is also widely known. [0003] However, the methacrylic resin molded article usually absorbs water easily, and if the methacrylic resin molded article that absorbs water during storage is thermoformed, foaming tends to occur. [0004] Hitherto, as a method for producing a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/14C08F2/44C08J5/18
Inventor 水本智裕
Owner SUMITOMO CHEM CO LTD
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