Thermoplastic rsin composition and its product

A thermoplastic resin and composition technology, applied in coatings, instruments, etc., can solve problems such as poor appearance, poor paintability, poor adhesion of coating films, and uneven color on the painted surface.

Inactive Publication Date: 2009-03-11
大科能宇菱通株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the coating of molded articles made of conventional rubber-reinforced thermoplastic resins such as ABS resin, discoloration on the painted surface due to poor adhesion of the coating film or absorption of coating thinner into the molded article Even, and the resulting poor paintability such as poor appearance has become a problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0092] Reference example 1 (preparation of rubber-reinforced thermoplastic resin (A))

[0093]In a branchable flask equipped with a dropping bottle, a condenser, a nitrogen inlet, and a stirrer, 40 wt. Fraction (converted by solid content), 0.5 weight fraction of potassium roseate as an emulsifier and 100 weight fractions of water are mixed, 10 weight fractions of styrene and 2 weight fractions of acrylonitrile are added, 0.1 tert-dodecyl mercaptan as a molecular weight regulator Weight fraction, 0.2 weight fraction of cumene hydroperoxide as a polymerization initiator. After raising the temperature to 70° C., 0.2 weight fraction of cumene hydroperoxide, 0.2 weight fraction of sodium pyrophosphate, 0.25 weight fraction of glucose, and 0.01 weight fraction of ferrous sulfate were added to carry out polymerization. One hour later, a mixture of 16 parts by weight of styrene, 8 parts by weight of acrylonitrile, 0.05 parts by weight of t-dodecylmercaptan, 40 parts by weight of wat...

reference example 2

[0096] Reference example 2 (copolymer (B))

[0097] As the copolymer (B1), 70% by weight of styrene monomer units, 30% by weight of acrylonitrile monomer units, M w It is an acrylonitrile-styrene copolymer of 8600 and an intrinsic viscosity [η] (measured in methyl ethyl ketone at 30°C) of 0.40 dl / g.

[0098] In addition, as the copolymer (B1), 64% by weight of styrene monomer units, 36% by weight of acrylonitrile monomer units, M w It is an acrylonitrile-styrene copolymer of 17600 and an intrinsic viscosity [η] (measured in methyl ethyl ketone at 30°C) of 0.80 dl / g.

Embodiment 1～3、 comparative example 1、2

[0100] According to the mixing ratio shown in Table 1, after mixing for 3 minutes with a Henschel mixer, use an NVC type extruder with a 50mm outlet made by Zhonggu Machinery Co., Ltd. to mechanically extrude at a hydraulic cylinder temperature of 180-220°C to obtain particles. The pellets were sufficiently dried and extruded using a J100E-C5 injection molding machine manufactured by Nippon Steel Works at a cylinder temperature of 200°C and a mold temperature of 50°C to obtain various test pieces for evaluation. Using this test piece, the above-mentioned Izod impact strength measurement, plating adhesion test, and paintability test were performed. The evaluation results are shown in Table 1.

[0101] Table 1

[0102] Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2 (weight fraction)

[0103] Copolymer (B2) 40 25 20 55

[0104] As can be seen from Table 1, comparative example 1 exceeds the scope of the pre...

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Abstract

The present invention provides a thermoplastic resin composition excellent in plating adhesion to the surface of a molded product, paintability and impact resistance, and a molded product thereof. This composition is obtained by graft-polymerizing a monomer component (b) consisting of an aromatic vinyl compound, a vinyl cyanide compound, and, if necessary, other copolymerizable monomer compounds in the presence of a rubbery polymer (a). The thermoplastic resin composition formed by the obtained rubber-reinforced thermoplastic resin (A) is characterized in that the content of the rubbery polymer (a) in the rubber-reinforced thermoplastic resin is 10 to 25% by weight, and the acetone in the rubber-reinforced thermoplastic resin The content of vinyl cyanide monomer units in the soluble fraction is 15 to 40% by weight, the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn of the acetone soluble fraction is 2 to 5, and the acetone can be The ratio Mz / Mn of the Z-average molecular weight Mz and the number-average molecular weight Mn of the solution is 5-11.

Description

technical field [0001] The present invention relates to a thermoplastic resin composition, and more specifically, to a thermoplastic resin composition excellent in plating adhesion to the surface of molded articles, paintability, and impact resistance. Background technique [0002] Conventionally, molded articles made of rubber-reinforced thermoplastic resins such as ABS resins often undergo secondary processing such as plating, painting, sputtering, and ion plating. Especially for electroplating, if electroplating is only performed on a molded article, the adhesion of the electroplating layer to the surface layer of the molded article is insufficient, and it is easy to peel off. Therefore, in order to improve the adhesion of the plating layer, the method of oxidizing the surface of the molded product to decompose the rubber component present in the surface layer of the molded product, forming fine recesses by corrosion, and then plating is known. According to this method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/00C09D151/04C08F279/04C08L51/04G06Q10/00
CPCG06Q10/00
Inventor 长原直司铃木昌则岩井一树
Owner 大科能宇菱通株式会社
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