Method of preparing high fluidity punching proof acrylic resin

A technology of polypropylene resin and high fluidity, applied in the field of polypropylene resin manufacturing, can solve the problems of physical properties such as rigidity, impact strength, tensile strength and flexural modulus, etc., and it is difficult to balance and balance the physical properties of products , to achieve the effect of excellent mechanical properties and high crystallization rate

Inactive Publication Date: 2009-01-07
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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AI Technical Summary

Problems solved by technology

But generally the improvement of fluidity will lead to the decline of physical properties such as rigidity, impact strength, tensile strength and flexural modulus, and the existing high fluidity impact polypropylene resin manufacturing method is often difficult to make the fluidity of the product and these Good balance and consideration of physical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0015] Propylene monomer undergoes bulk polymerization in the presence of a catalyst. The catalyst is a Ziegler-Natta catalyst. The polymerization temperature, reaction pressure and reactant residence time are shown in Table 1;

[0016] The above reaction products undergo gas phase copolymerization in the presence of ethylene. The ethylene concentration control in the reaction system, the temperature of the copolymerization reaction, the reaction pressure, and the residence time of the reactants are shown in Table 2;

[0017] The above-mentioned copolymerized product and peroxide are heated and melted and blended, and the heating temperature and the time of melt blending are controlled in Table 3.

[0018] The physical properties of the polypropylene resin obtained in each example were measured, and the data are listed in Table 4.

[0019] Table 1.

[0020] temperature reflex

(℃)

Reaction pressure

(MPa)

Stay time

(Hour)

Example 1

50

...

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PUM

PropertyMeasurementUnit
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Abstract

A high fluidity anti-impact polypropylene resin process comprises the processes that propylene monomers are bulk polymerized under the existence of catalysts, the catalysts are ziegler-natta catalysts, the polymerization reaction temperature is 50 DEG C to 80 DEG C, the reaction pressure is 2.4 MPa to 6.0 MPa, and the residence time of the reactants is 0.8 to 3 hours; the reaction products are carried out the gas-phase copolymerization under the existence of ethylene, the ethylene concentration in the reaction system is controlled between 0.25 volume percent and 1.2 volume percent, the copolymerization temperature is 50 DEG C to 100 DEG C, the reaction pressure is 0.9 MPa to 2.0 MPa, and the residence time of the reactants is 0.2 to 2.5 hours; the copolymerization products and peroxides are heated, melted and blended, the heating temperature is 180 DEG C to 270 DEG C, and the melt-blending time is controlled between 10 seconds and 30 seconds. The product has the physical properties of ideal rigidness as well as impacting strength, etc. and has excellent fluidity; the melt flow rate can reach more than 30g / 10min.

Description

Technical field [0001] The invention relates to a method for manufacturing polypropylene resin, in particular to a method for manufacturing high-fluidity impact-resistant polypropylene resin. Background technique [0002] Impact-resistant polypropylene resin has been widely used in the manufacture of household appliances parts, such as washing machine shells and barrels. Impact polypropylene resin should have excellent rigidity and impact strength, high tensile strength and flexural modulus. However, in order to obtain large and thin-walled injection molded products, good fluidity is also necessary. The melt flow rate of ordinary impact polypropylene resin is about 15g / 10min, while the melt flow rate of impact polypropylene resin for manufacturing large-scale thin-walled injection molding products requires a melt flow rate of 20-30g / 10min, sometimes even more than 30g / 10min. However, the increase in fluidity usually leads to a decrease in physical properties such as rigidity, imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F2/34
Inventor 孙旭辉钟峰高道春
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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