Polypropylene material with high gloss and low linear expansion coefficient and preparation method thereof

Abstract

The invention discloses a polypropylene material with high gloss and low linear expansion coefficient and a preparation method of the polypropylene material, and belongs to the technical field of polymer engineering plastics. The polypropylene material with high gloss and low linear expansion coefficient comprises the following components by mass: 70-95 parts of polypropylene resin, 5-20 parts ofpolyethylene, 0.2-2 parts of aluminite powder, 0.3-2 parts of pearl powder, 0.05-0.6 part of nucleating agent, 0.2-0.6 part of light stabilizer, 0.1-0.5 part of lubricant, 0.2-0.4 part of antioxygen,and 1-6 parts of color masterbatch. By reasonably controlling the proportion of the components and the ingredients in the formula, the polypropylene material achieves the metallic pearl effect of theplastic material and has the advantages of being free from spraying, saving the energy and protecting the environment, the processing and molding performances and the mechanical property of the material are improved, and the polypropylene material further has the advantages of high fluidity, high gloss, and low linear expansion coefficient.

Description

technical field [0001] The invention belongs to the technical field of polymer engineering plastics, and in particular relates to a polypropylene material with high gloss and low linear expansion coefficient and a preparation method thereof. Background technique [0002] PP plastic is a polypropylene copolymer with a specific gravity of 0.9-0.96g / cm 3 , The molding shrinkage rate is 1.0-2.5%, and the molding temperature is 180-220°C. PP material is a semi-crystalline thermoplastic with high impact resistance, strong mechanical properties, resistance to various organic solvents and acid and alkali corrosion, good processing performance, good toughness, easy orientation during molding, and stress concentration or Deformation, low melt viscosity, good fluidity, easy to form and process. However, due to its poor notched impact performance, large shrinkage range and shrinkage value, it is prone to shrinkage cavities, dents, deformation, and slow heat dissipation; in addition, t...

AI Technical Summary

Problems solved by technology

However, due to its poor notched impact performance, large shrinkage range and shrinkage value, it is prone to shrinkage cavities, dents, deformation, and slow heat dissipation; in addition, traditional PP is not easy to color, has high thermal expansion coefficient, and insufficient material rigidity. Application fields of PP materials

[0003] Patent CN104693602A provides a method for preparing a high-fluidity, high-gloss, non-surface-defect colored metallic pearl effect spray-free polypropylene automotive material, which mainly consists of polypropylene (40-70%), toughening agent (2-4%) , mineral masterbatch (5-20%), compatibilizer (5-10%), antioxidant (0.4-0.6%), light stabilizer (0.4-0.6%), lubricant (0.8-2%), Surface modifier (6-10%), color metal pigment masterbatch (3-6%), pearlescent color masterbatch (3-6%); but the addition of too much metal powder and pearlescent powder will seriously affect the mechanics of the material At the same time, defects such as weld marks will be caused by powder accumulation; the high-flow melt index mentioned in the patent is as high as 60-150g / 10min. Although the obtained material has a good effect, the raw material is expensive and the mechanical properties (especially impact properties) of the material are low.

[0004] Patent 201610536341.X provides a metal texture spray-free polypropylene composite material for automotive exterior parts and its preparation method, mainly composed of polypropylene (37.2-74.6%), elastomer (5-10%), inorganic minerals Master batch (10-30%), compatibilizer (3-6%), antioxidant (0.4-0.8%), light stabilizer (0.3-0.6%), lubricant (0.5-1%), nucleating agent agent (0.2-0.4%), surface modifier (4-8%), metal pigment masterbatch (2-6%); the particle size of the metal powder is 110-150um, and the large particle size of the metal powder has a great effect on solving the weld line It will help, but in turn, it will require high shearing of the screw. Low shearing will not cause damage to the coated metal powder, but it will affect the overall material performance due to insufficient shearing force; at the same time, a single metal powder is not easy to color and will Affect the scope of material application

[0005] Patent CN104693603A provides a micro-foaming spray-free polypropylene material that can realize lightweight, environmental protection and metal effect and its preparation method; it mainly consists of polypropylene (28-75.3%), toughening agent (3-6%), Talc masterbatch (10-40%), compatibilizer (3-6%), foam masterbatch (4-8%), antioxidant (0.2-0.6%), light stabilizer (0.1-0.4%) ), lubricant (0.4~2%), nucleating agent (0.2~0.4%), interface treatment agent (2~4%), metal pigment masterbatch (2~5%); , special molding equipment is required to guarantee, otherwise it will cause appearance defects, so the current micro-foaming technology is mainly used in lightweight structural parts rather than appearance parts, resulting in a narrow application range; and a high proportion of filling will seriously weaken metal texture effect

[0006] Patent CN106496773A provides a kind of silver-colored metal-textured spray-free composite material and its preparation method and application, mainly composed of polypropylene (50-60%), polybutene (3-7%), toughening agent (5-15%) ), mineral filler (10~30%), compatibilizer (2~6%), anti-scratch additive 1-4%, anti-aging agent (0.4~3%), coated aluminum powder masterbatch (1~ 6%); it uses polypropylene and polybutene to make up for the defects of traditional polypropylene through the excellent properties of polybutene, such as weather resistance, plasticizers, and lubricants; the added toughening agent can improve the mechanical properties of the material; but Since there are mature weather-resistant copolymerized PP alternatives on the market, and the addition of polybutene and scratch-resistant agents will affect the color of the product, it is impossible to achieve a high-gloss effect, and a high proportion of filling will seriously weaken the metal texture effect

[0007] Patent CN106905611A provides a high-gloss spray-free polypropylene composite material and its preparation method, which mainly consists of polypropylene resin (50-95%), inorganic filler (0-30%), antioxidant (0.1-1.0%), Lubricant (0.1-2.0%), nucleating agent (0.05-0.5%); the patent uses homopolymerized PP, which has good gloss, adding nucleating agent can better improve gloss, but its mechanical properties are poor , easy to become brittle, and added inorganic mineral powder, metal powder, etc., but the patent does not reflect toughening or provide measures to improve impact strength, so its application range is greatly limited; at the same time, aluminum powder and pearl powder are compounded, Among them, the particle size of aluminum powder is 100um, and the particle size of pearl powder is 300um. The powder with large particle size is easily broken in the extrusion place and the injection molding screw, which affects the appearance quality of the product.

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