Polypropylene composition for vehicle and its preparation method

Abstract

The present invention disclosed a car polypropylene composition. The component of its component is based on the weight percentage of: polypropylene A40 ~ 94%, polypropylene B2-20%, elastic body 2 ~ 20%0 ~ 30%of talc powder, 1 ~ 2%of liquid extracting agent, and 1 ~ 3%of the aid.The polypropylene A is a common polypropylene, and its melting flow rate is 5-60g / 10min, and the impact intensity of the cantilever beam gap is greater than 5KJ / m2 at 23 ° C.Ion cohesion polymerization, Ziegler-Natta negative ion cohesion aggregation or mottled metal catalysts; polypropylene B is a highly melt intensity polypropylene, its melt strength (CN) is 8-300.2-10g / 10min.The advantage is: 1.The introduction of high melt intensity polypropylene and liquid extracting agent can reduce the distribution of car polypropylene and organic matter;The effective time of the secondary vacuum prolapse can increase the effective action time of the liquid extracting agent in the system.The preparation process is simple, the equipment requirements are not high, and the product yield is high.

Description

technical field [0001] The invention relates to a polypropylene composition, especially a low-emission polypropylene composition for vehicles; the invention also provides a preparation method of the low-emission polypropylene composition. Background technique [0002] Because the car compartment is often in a closed state, its interior products such as leather seat covers or cloth seat covers will produce free formaldehyde, alkanes, benzene, toluene and other organic compounds, which will have adverse effects on the human body. In order to reduce the content of emanating substances in the material, it is necessary to control the source of raw materials, processing technology, additives, etc., or add substances that can react with these small molecule volatile substances to form a material with a larger molecular weight and less volatile energy. Compounds that are not easily volatile, so as to achieve the purpose of reducing the emitted substances. [0003] At present, two ...

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Problems solved by technology

[0004] However, the method of reducing emanating substances through chemical reactions often only targets one factor and cannot solve the emanating problems caused by various factors at the same time; physical adsorption does not have specific selectivity and can adsorb all small molecules produced, but Adding molecular sieves to prepare low-emission polypropylene materials has two disadvantages: one is that no oily substances can be added to the system. In the actual production process, it is generally necessary to add a certain amount of white oil or mineral oil to obtain a composition with uniform properties. The filler adheres to the surface of the resin material, and after adding molecular sieve, it is easy to absorb oily substances, which makes the adsorption effect worse; secondly, the substances adsorbed by molecular sieves still exist in the system, and there is a risk of re-release under long-term heat aging and photoaging

[0005] 2. Polymer devolatilization, mainly adopts special devolatilization equipment and technology to carry out devolatilization in the process of polypropylene polymerization or modification, and the limitation of high cost of equipment required for devolatilization in the polymerization process is not easy to be widely used; patent CN200810023327. 5 discloses a method of adding a low-molecular organic matter remover during the modification process and then using a three-stage vacuum to prepare special materials for low-emission automotive interiors; however, the remover added by this method is difficult to stably disperse in the polymer melt , and the three-stage vacuum reduces the effective action time of the removal agent in the system, and the devolatilization efficiency is not high

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