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A kind of polypropylene composite material and its preparation method and shaping process

A composite material and polypropylene technology, applied in the field of polypropylene composite materials and its preparation, can solve problems such as aging degradation, limited use of PP, poor cold resistance, etc., and achieve the effect of enhancing toughness and impact resistance and reducing density

Active Publication Date: 2019-03-08
PANJIN HAIXING FINE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, polypropylene (PP) has some disadvantages, such as, it is prone to aging and degradation after being exposed to light, heat and oxygen, resulting in performance degradation and discoloration, poor cold resistance, and brittle fracture at low temperature. These shortcomings limit the application of PP. Therefore, it is necessary to improve the impact resistance of polypropylene (PP) in order to expand the application field of PP

Method used

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  • A kind of polypropylene composite material and its preparation method and shaping process

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Experimental program
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Effect test

Embodiment 1

[0024] The composite material disclosed in the present invention comprises: polypropylene with a weight ratio of 60% to 75%, a filler with a weight ratio of 17% to 28%, a foaming agent with a weight ratio of 2% to 5%, and a weight ratio of 1%. ~2% elastic agent and weight ratio are 0.1%~0.2% antioxidant; Wherein, filler is talcum powder or aluminum oxide powder; Described foaming agent is a kind of in magnesium carbonate, calcium carbonate, sodium bicarbonate ; The elastic agent is EPDM rubber, grafted EPDM rubber or polyene; the antioxidant is a mixture of phosphite secondary antioxidant and metal ion deactivator.

Embodiment 2

[0026] In this embodiment, the filler is talcum powder, the foaming agent is magnesium carbonate, the elastic agent is EPDM rubber, and the antioxidant is a mixture of phosphite antioxidant and metal ion deactivator.

[0027] The concrete preparation method of polypropylene composite material comprises the following steps:

[0028] (1) Propylene is used as raw material to produce polypropylene in a gas phase reactor, and inert gas protection is required to control the aggregation state of the polymer to obtain a specific product structure, that is, polypropylene at a temperature of 230°C and a pressure of 2.16Kg. The melt flow rate is 1.0-20.0g / 10min, and the recommended melt flow rate is 3.0-7.0g / 10min.

[0029] (2) On the basis of the polypropylene prepared by the gas phase reactor, the prepared polypropylene and other raw materials are 70% polypropylene by weight, 20% talc by weight, and 4% magnesium carbonate by weight. , 1.9% by weight of EPDM rubber and 0.15% by weight ...

Embodiment 3

[0045] The shaping process of the polypropylene composite material prepared by embodiment 2 is as follows:

[0046] Since the melting point of polypropylene is between 164°C and 174°C, and the melting point range is narrow, the present invention proposes a shaping process that shrinks at high temperature, uses at low temperature, and eliminates internal stress.

[0047] The shaping process is as follows: Aiming at the shrinkage gradient of the polypropylene material during the heating process, keep the shrinkage temperature at 170°C to 180°C for 2 to 6 minutes, then keep the shrinkage temperature at 100°C to 130°C for 25 to 30 minutes, and finally Water cooling is used for shaping.

[0048] The rollers can be used to input and output synchronously at the mouth of the drying tunnel, and the drying tunnel can be heated by infrared rays or microwaves.

[0049] For films made of small rolls or narrow polypropylene composite materials, since the width of the film is very small, ab...

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Abstract

The invention discloses a polypropylene composite material and a preparation method and shaping technology thereof. The composite material is prepared from, by weight, 60-75% of polypropylene, 17-28% of filling agent, 2-5% of foaming agent, 1-2% of elastic additive and 0.1-0.2% of antioxidant. The filling agent is one or more of talcum powder and aluminum oxide powder. The foaming agent is one or more of magnesium carbonate, calcium carbonate and sodium bicarbonate. The elastic additive is one or more of EPDM, grafted EPDM and polyene. The antioxidant is a mixture of a phosphite ester antioxidant and a metal ion passivator. By means of the technical scheme, impact resistance can be effectively enhanced, density of the composite material is reduced, and the defects that polypropylene is prone to ageing and degrading under the action of light, heat and oxygen and accordingly performance is decreased, discoloring occurs, cold resistance is poor and breaking is likely to happen at low temperature can be overcome.

Description

technical field [0001] The invention relates to the technical field of polypropylene modification, in particular to a polypropylene composite material, a preparation method and a shaping process thereof. Background technique [0002] At present, the public knows that polypropylene (PP) is widely used in people's daily life because of its excellent comprehensive properties, wide range of sources, light weight and low price. Due to the different purposes of the demand for polypropylene (PP) materials in daily life, more requirements are put forward for its performance. [0003] At present, polypropylene (PP) has some shortcomings, such as, it is prone to aging and degradation after being exposed to light, heat and oxygen, resulting in performance degradation and discoloration, poor cold resistance, and brittleness at low temperature, etc. These shortcomings limit the application of PP. Therefore, it is necessary to improve the impact resistance of polypropylene (PP) in order ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/16C08K13/02C08K3/34C08J9/08
CPCC08J9/08C08J2203/02C08J2323/12C08J2423/16C08L23/12C08L2203/14C08L2203/30C08L23/16C08K13/02C08K3/34
Inventor 姚春生
Owner PANJIN HAIXING FINE CHEM TECH
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