Low-temperature-impact-resistant PP (polypropylene) plastic and preparation method thereof

An impact-resistant, low-temperature technology, applied in the polymer field, can solve the problems of low impact strength, small molecular chain flexibility, poor impact resistance, etc. The effect of heat resistance

Inactive Publication Date: 2018-08-24
徐菡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For isotactic polypropylene (PP), in isotactic PP, the pendant methyl groups are in the same configuration and located on the same side of the polymer chain, and in the extended configuration, these groups strongly repel each other, by forming 31 helices (that is, each helical cycle has 3 chemical repeating units), the methyl groups on the chain are as far away from each other as possible, this is the configuration with the lowest energy of the polymer, according to this regular repeat arrangement, isotactic PP has high crystallinity Degree, poor impact resistance
Because the methyl groups on the chain are arranged in an orderly manner in space, the internal rotation of the C-C bond on the main chain is hindered, the flexibility of the molecular chain is small, and its impact strength is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] A kind of preparation method according to above-mentioned impact-resistant low-temperature PP plastic, is characterized in that, comprises the following steps:

[0030] (1) Ethylene-propylene copolymer, propylene-farnesene copolymer is obtained by emulsion polymerization in proportion;

[0031] (2) Mix PP, low-density polyethylene, ethylene-propylene copolymer, propylene-farnesene copolymer, pitch-based carbon fiber, coarse-porous silica gel, chopped nylon fiber, antioxidant, and lubricant at high speed in proportion Mix in the machine for 5-10 minutes to obtain mixed raw materials;

[0032] (3) Put the mixed raw materials in step 2 into a twin-screw extruder for reaction, and the material stays in the barrel for 1-2 minutes to obtain a reaction product. The temperature of each zone of the twin-screw extruder is as follows: 1 zone 180 -200°C, Zone 2 200-220°C, Zone 3 200-220°C, Zone 4 200-220°C, Zone 5 200-220°C, Zone 6 200-220°C, Zone 7 200-220°C, Zone 8 200- 220°C, ...

Embodiment 1

[0035] The PP plastic for impact-resistant low temperature is characterized in that, in parts by mass, it includes the following raw materials: 100 parts of PP, 15 parts of low-density polyethylene, 15 parts of ethylene-propylene copolymer, 15 parts of propylene-farnesene copolymer, asphalt 7.5 parts of base carbon fiber, 2.5 parts of coarse porous silica gel, 5 parts of chopped nylon fiber, 1.5 parts of antioxidant, and 3 parts of lubricant.

[0036] The propylene content of the ethylene-propylene copolymer is 12.5%, and the farnesene content of the propylene-farnesene copolymer is 12.5%. Coarse porous silica gel is microspherical coarse porous silica gel, 20-50 mesh. The length of the pitch-based carbon fiber is 150um. The length of the chopped nylon fibers is about 0.4 mm. The antioxidant is a polybasic hindered phenol antioxidant. Described lubricant is polyethylene wax.

[0037] A kind of preparation method according to above-mentioned impact-resistant low-temperature...

Embodiment 2

[0043] The PP plastic for impact-resistant low temperature is characterized in that, in parts by mass, it includes the following raw materials: 100 parts of PP, 10 parts of low-density polyethylene, 20 parts of ethylene-propylene copolymer, 10 parts of propylene-farnesene copolymer, asphalt 10 parts of base carbon fiber, 2 parts of coarse porous silica gel, 6 parts of chopped nylon fiber, 1 part of antioxidant, and 4 parts of lubricant.

[0044] The propylene content of the ethylene-propylene copolymer is 15%, and the farnesene content of the propylene-farnesene copolymer is 10%. Coarse porous silica gel is microspherical coarse porous silica gel, 20-50 mesh. The length of the pitch-based carbon fiber is 200um. The length of the chopped nylon fibers is about 0.3 mm. The antioxidant is a polybasic hindered phenol antioxidant. Described lubricant is polyethylene wax.

[0045] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a low-temperature-impact-resistant PP (polypropylene) plastic and a preparation method thereof. The impact-resistant low-temperature PP plastic comprises PP, low-density polyethylene, ethylene-propylene copolymers, propylene-Farnesene copolymers, pitch-based carbon fibers, silochrom, chopped nylon fibers, antioxidants and lubricating agents. Low-temperature-impact resistance and mechanical properties of the low-temperature-impact-resistant PP plastic are enhanced.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a PP plastic for impact resistance and low temperature and a preparation method thereof. Background technique [0002] Polypropylene, English name: Polypropylene, abbreviated name PP. Its chemical formula is: (C3H6)N. The structural formula is as follows: Polypropylene PP, as one of the general plastic materials, has excellent comprehensive properties, good chemical stability, good molding performance and relatively low price; but PP has low strength, modulus and hardness. , poor low temperature impact strength, large molding shrinkage, easy aging and other shortcomings. Therefore, it is modified so that it can be adapted to the needs of the product. Each modified PP has a large number of applications in the fields of household appliances and vehicles. Silica lime is a needle-like fiber, which has a reinforcing effect on polypropylene, and also greatly improves t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L23/08C08L23/14C08L77/00C08K13/04C08K7/06C08K7/26
CPCC08K2201/004C08K2201/005C08L23/12C08L2205/035C08L2205/16C08L2207/066C08L23/06C08L23/0815C08L23/14C08L77/00C08K13/04C08K7/06C08K7/26
Inventor 徐菡
Owner 徐菡
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