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Processing assistant for expansion molding, vinyl chloride resin composition for expansion molding, and expansion molded body

A technology for vinyl chloride resin and foam molding, which is applied in the field of foam molding, can solve the problems of difficult foam molding, uneven foam cell structure, elongation characteristics, insufficient melting strength, etc., and achieves improved melting The effect of strength, excellent molding appearance

Active Publication Date: 2011-10-19
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the case of directly producing a foamed molded article from a vinyl chloride resin, the elongation characteristics and melt strength of the vinyl chloride resin are insufficient at ordinary molding processing temperatures, so that a non-uniform foam cell structure is formed and cannot be formed. Arbitrarily high expansion ratio is achieved, therefore, it is difficult to obtain a satisfactory foam molding
In addition, since the allowable range of molding conditions for vinyl chloride resins is narrow, it is also difficult to obtain satisfactory foam moldings only by changing the molding processing conditions.

Method used

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  • Processing assistant for expansion molding, vinyl chloride resin composition for expansion molding, and expansion molded body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Add 230 parts of deionized water into a reactor equipped with a stirring device and a reflux condenser, further add 1.5 parts of dioctyl sodium sulfosuccinate, and replace the container with nitrogen. Then 0.15 parts of potassium persulfate and 100 parts of isobutyl methacrylate were added thereto, and the external temperature of the reactor was raised to 65° C. under stirring, and heated and stirred for 2 hours to complete polymerization and obtain latex.

[0059] The latex was cooled, and spray-dried under the conditions that the inlet temperature of the drying gas was 160° C. and the outlet temperature of the drying gas was 70° C. to obtain a polymer powder. Reduced viscosity of polymer (η sp / c) was 9.7. The obtained powder of the polymer (A) was used as a processing aid (B-1) for foam molding.

[0060] 15 parts of the obtained processing aid for foam molding (B-1) were mixed as follows, and the blending was completed at an internal temperature of 90° C. to obtain...

Embodiment 2～3、 comparative example 1～8

[0090] Except that the composition of the monomer components was changed to the ratio shown in Table 1, the same operation was carried out as in Example 1, and polymerization and spray drying were carried out to obtain polymer powder, a vinyl chloride resin composition for foam molding, and foam. Foam molding.

[0091] Table 1 shows the evaluation results of the foamed molded articles obtained in Examples 1 to 3 and Comparative Examples 1 to 8.

[0092]

[0093] The abbreviations in the table are as follows.

[0094] i-BMA: Isobutyl methacrylate

[0095] n-BMA: n-butyl methacrylate

[0096] t-BMA: tert-butyl methacrylate

[0097] MMA: methyl methacrylate

[0098] n-BA: Butyl acrylate

[0099] n-OM: n-octylthiol

[0100] As is clear from the results in Table 1, the use of a processing aid for foam molding containing a polymer (A) obtained by polymerizing a monomer component (a) containing 65% by mass or more of isobutyl methacrylate By performing foam molding, a molde...

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Abstract

Disclosed is a vinyl chloride resin expansion molded body having fine and uniform foam cells and excellent appearance. Also disclosed are a processing assistant for expansion molding, which is useful for production of the vinyl chloride resin expansion molded body, and a vinyl chloride resin composition for expansion molding. The processing assistant for expansion molding comprises a polymer (A) which is obtained by polymerizing a monomer component (a) containing not less than 65% by mass of isobutyl methacrylate, and the polymer (A) has a reduced viscosity (?sp / c) of not less than 4, when measured at 25 DEG C by dissolving 0.1 g of the polymer (A) into 100 ml of chloroform.

Description

technical field [0001] The present invention relates to a processing aid for foam molding, a vinyl chloride resin composition for foam molding containing the processing aid, and a molded foam obtained by molding the resin composition. [0002] This application claims priority based on Japanese Patent Application No. 2008-305157 filed in Japan on November 28, 2008, and the contents thereof are cited in the present application. Background technique [0003] Vinyl chloride-based resins are widely used as general-purpose resin materials with high utility value because they not only have excellent properties such as chemical resistance, impact resistance, and weather resistance, but are also inexpensive. Foam molding is one of its preferred uses, and attempts are being made, for example, to manufacture foam molded products as building materials for synthetic wood and the like. [0004] However, in the case of directly producing a foamed molded article from a vinyl chloride resin...

Claims

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Application Information

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IPC IPC(8): C08J9/04C08F20/18
CPCC08J9/06C08J9/0061C08J2327/06C08J2433/00
Inventor 上野尚文青木秀夫笠井俊宏
Owner MITSUBISHI CHEM CORP
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