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Preparation method of soft-touch polypropylene composite material

A technology of composite materials and polypropylene, which is applied in the field of polypropylene materials, can solve problems affecting the appearance and performance, difficulty in dispersing elastomers, and insignificant reduction in hardness, etc., and achieve a good soft touch effect

Active Publication Date: 2020-04-10
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount of addition is small, the decrease in hardness is not obvious, and a better soft touch cannot be obtained; adding a large amount of elastomer will easily cause the problem of difficulty in dispersing the elastomer in the matrix
This defect will lead to problems such as flow marks and surface pitting of the polypropylene composition during extrusion, injection molding, slush molding, etc., which seriously affect the appearance and performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 1 part by mass of sodium bicarbonate, 2.2 parts by mass of citric acid, 0.8 part by mass of xylitol microcapsules, and 4 parts by mass of erythritol microcapsules, mix them evenly, add them to 50 parts by mass of silicone oil, and use 75 rpm Stirring at a stirring speed for 18 hours; followed by suction filtration and drying to obtain a foaming composition;

[0022] Among them: citric acid can increase the thermal decomposition initiation temperature of sodium bicarbonate, and at the same time, citric acid itself has a foaming effect, which is beneficial to improve the foaming effect; xylitol and erythritol are medium-temperature phase change materials with excellent performance , it is solid at room temperature, and when the ambient temperature rises above the melting point, it will undergo a phase change (solid to liquid) and absorb a lot of heat at the same time; mixing it with sodium bicarbonate can reduce carbonic acid through phase change and endothermic ...

Embodiment 2

[0031] (1) Weigh 1 part by mass of sodium bicarbonate, 2.5 parts by mass of citric acid, 1.5 parts by mass of xylitol microcapsules and 2 parts by mass of erythritol microcapsules. Stirring at a stirring speed for 24 hours; then suction filtration and drying to obtain a foaming composition; the foaming temperature of the foaming composition in this embodiment is 130°C;

[0032] (2) Weigh 20 parts by mass of polyurethane resin and heat to 120°C; evenly add 7 parts by mass of foaming composition and 8 parts by mass of carbon fiber, and knead with a kneader at a speed of 40 rpm for 4 hours to mix the foaming composition and carbon fiber into the polyurethane In the resin; then use circulating water to cool and granulate to obtain polyurethane masterbatch;

[0033] (3) Weigh 100 parts by mass of polypropylene resin, 11 parts by mass of whiskers, 1 part by mass of coupling agent, 13 parts by mass of talcum powder and 1 part by mass of antioxidant, mix them evenly; then pass them in...

Embodiment 3

[0038] (1) Weigh 1 part by mass of sodium bicarbonate, 1.5 parts by mass of citric acid, 2.5 parts by mass of xylitol microcapsules, and 1 part by mass of erythritol microcapsules, mix them evenly and add them to 50 parts by mass of silicone oil, at 100 rpm Stir at a stirring speed for 12 hours; then filter and dry to obtain a foaming composition; the foaming temperature of the foaming composition in this example is 134°C; in addition, both xylitol microcapsules and erythritol microcapsules use polyurethane as microcapsules the wall material;

[0039] (2) Weigh 18 parts by mass of polyurethane resin and heat to 130°C; evenly add 6 parts by mass of foaming composition and 4 parts by mass of carbon fiber, and knead with a kneader at a speed of 120 rpm for 1 hour to mix the foaming composition and carbon fiber into the polyurethane In the resin; then use circulating water to cool and granulate to obtain polyurethane masterbatch;

[0040] (3) Weigh 100 parts by mass of polypropyl...

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Abstract

The invention relates to a preparation method of a soft-touch polypropylene composite material. The preparation method comprises the steps of preparation of a foaming composition, preparation of polyurethane master batch, preparation of polypropylene resin master batch, mixing of the polyurethane master batch and the polypropylene resin master batch and the like. The foaming agent foams in polyurethane during injection molding so that more elastic holes are formed in the material, and the polypropylene material is endowed with good soft touch due to the elasticity of the polyurethane elastomer; meanwhile, the surface of the injection molding part made of the polypropylene material prepared by the method has no phenomena such as air marks, flow marks and welding marks.

Description

technical field [0001] The invention relates to the field of polypropylene materials, in particular to a method for preparing a soft-touch polypropylene composite material. Background technique [0002] In recent years, the rapid development of the automobile industry has put forward higher and higher requirements for interior and exterior materials. For example, automotive interior materials are usually required to have a soft touch, but the common polypropylene material has high crystallinity, so it has high hardness and does not have a soft touch. At present, the hardness is mainly reduced by adding elastomer (rubber) to the polypropylene component to obtain a soft touch. However, when the addition amount is small, the decrease in hardness is not obvious, and a better soft touch cannot be obtained; adding a large amount of elastomer will easily cause the problem of difficulty in dispersing the elastomer in the matrix. This defect will lead to problems such as flow marks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L75/08C08K13/04C08K7/06C08K3/34C08K7/08C08J9/08C08J3/22
CPCC08J9/08C08J9/0061C08J9/0085C08J9/0095C08J9/0066C08J3/226C08J2203/02C08J2323/12C08J2475/08
Inventor 汪理文郑帅张辉周明牛国增翁永华
Owner SUZHOU RUNJIA ENGINEER PLASTIC
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