Resin dedicated for coating on polypropylene plastics

A polypropylene plastic, chlorinated polypropylene technology, applied in the direction of coating, can solve the problems of difficult copolymerization, poor affinity with polypropylene plastic, narrow application area, etc., to improve comprehensive performance and blend compatibility. , the effect of improving construction performance

Inactive Publication Date: 2002-06-12
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high crystallinity and low polarity, polypropylene plastic has long been difficult to paint and print due to poor adhesion between the coating and its surface.
In order to solve this problem, in the past, methods such as grinding, chromic acid oxidation, and corona were generally used to treat the surface of polypropylene plastics. However, these pretreatment processes either require specific equipment or cause pollution to the environment, so they are subject to certain restrictions. limit
Using chlorinated polypropylene resin, although the pretreatment on the surface of polypropylene plastic can be avoided, the adhesion between the coating and the topcoat layer formed by this resin is poor, and the practicability is poor.
Although the existing acrylate-modified chlorinated polypropylene resins and maleic anhydride-modified chlorinated polypropylene resins have improved adhesion to the surface of polypropylene plastics, their compatibility with other topcoats is still limited. In particular, the preparation of these resins still has the following difficulties: ① When preparing acrylic modified chlorinated polypropylene resin, when the chlorine content of chlorinated polypropylene is greater than 35%, grafting with acrylic acid monomers is easy to occur Copolymerization reaction, the reaction conversion rate is high, but the affinity between the obtained resin and polypropylene plastic is very poor; when the chlorination content of chlorinated polypropylene is lower than 30%, although the obtained resin and polypropylene plastic have good adhesion, but in Under such conditions, the conversion rate of the copolymerization reaction is extremely low and the resulting resin has poor storage stability, so it is not practical; ②When preparing maleic anhydride-modified chlorinated polypropylene resin, it is usually necessary to polymerize maleic anhydride and polypropylene by melt polymerization , and then chlorination, this process is complex and difficult to control, the water resistance and weather resistance of the obtained resin are not ideal, and the relatively simple solution polymerization method is difficult to complete this copolymerization reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a four-necked flask equipped with a condenser, a thermometer, a dropping funnel and a stirrer, 90 parts of solvent (toluene) are charged, and 6 parts of chlorinated polypropylene and 20 parts of E-44 are added according to the quantity listed in Table 1, and the temperature rises to 80°C, then dropwise add 35 parts of methyl methacrylate, 17 parts of butyl acrylate, 1 part of acrylic acid, 20 parts of styrene, 11 parts of TSC-1 and 1.1 parts of initiator azobisisobutyronitrile, and finally keep warm for 4 Hour, cool with 10 parts of toluene, make resin (P-1) of the present invention, its solid is divided into 50% and in solid part, component (A) chlorinated polypropylene accounts for 6%, and component (B) epoxy resin E-44 accounts for 20%, component (C) acrylic acid, styrene, methyl methacrylate, and butyl acrylate account for 72% in total, and component (D) TSC-1 accounts for 1%.

Embodiment 2-4

[0024] The synthesis process is the same as in Example 1, and the dosage of each component is adjusted according to Table 1 to obtain resins (P-2) to (P-4) of the present invention, the solid content of which is 50%.

[0025] In P-2: component A accounts for 6%, component B accounts for 20%, component C accounts for 73%, and component D accounts for 1%;

[0026] In P-3: component A accounts for 6%, component B accounts for 20%, component C accounts for 73.5%, and component D accounts for 0.5%;

[0027] In P-4: component A accounts for 6%, component B accounts for 20%, component C accounts for 73.5%, and component D accounts for 0.5%.

Embodiment 5～8

[0029] Except that the reaction temperature is changed to reflux temperature, and the initiator is changed to dibenzoyl peroxide, all the other operations are the same as in Example 1, and the amount of each raw material is adjusted according to Table 1 to obtain the resin of the present invention (P-5)~(P-8 ), the solid content is 50%.

[0030] In P-5: component A accounts for 15%, component B accounts for 6%, component C accounts for 78.5%, and component D accounts for 0.5%;

[0031] In P-6: component A accounts for 15%, component B accounts for 0%, component C accounts for 84.5%, and component D accounts for 0.5%;

[0032] In P-7: component A accounts for 15%, component B accounts for 6%, component C accounts for 78%, and component D accounts for 1.0%;

[0033] In P-8: component A accounts for 15%, component B accounts for 0%, component C accounts for 84%, and component D accounts for 1.0%;

[0034] The above resins (P-1)-(P-8) did not change after being stored at 40°C fo...

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Abstract

A special-purpose resin for coating it on surface of polypropylene plastics is prepared from chlorinated polypropylene resin (5-50 wt.%), epoxy resin (0-30), monomer containing unsaturated bi-bond able to partiapate copolymerzation (20-90) and copolymer of organic compound of special element containing bi-bond (0.1-5) through the conventional solution method. Its coated film features high adhesion, weatherability and the resistance to water and solvent.

Description

technical field [0001] The invention relates to a special resin for polypropylene plastic coating. Background technique [0002] With the development of society and the progress of industry, plastics play an increasingly important role in people's lives. Polypropylene plastic is widely used in automobiles, motorcycles, home appliances, daily necessities, packaging materials and other fields due to its advantages such as easy molding, small specific gravity, low price, good mechanical properties, reusability, and non-toxicity. However, due to its high crystallinity and low polarity, polypropylene plastic has long been difficult to paint and print due to poor adhesion between the coating and its surface. In order to solve this problem, in the past, methods such as grinding, chromic acid oxidation, and corona were generally used to treat the surface of polypropylene plastics. However, these pretreatment processes either require specific equipment or cause pollution to the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D123/08
Inventor 周铭庄爱玉钱大庆袁恩余李敏
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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