Preparation method of low-mould shrinkage ratio polypropylene alloy material

A technology of alloy material and polypropylene, which is applied in the field of preparation of polypropylene alloy materials, can solve the problems of reducing PP molding shrinkage, achieve the goal of reducing PP molding shrinkage, realizing general plastic engineering, and good compatibility Effect

Active Publication Date: 2010-11-10
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the patented technology that reduces the shrinkage rat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this embodiment, it is assumed that SIS products with a molecular weight of 100,000 to 130,000 are produced, and the styrene content is 15%. The volume of cyclohexane used is 60% of the total volume of the reactor, the dosage of tetrahydrofuran is 81ppm, the total monomer dosage of styrene and isoprene is 15% of the total mass of the reaction system, and the dosage of the terminator is the initiator. 1.2 times the total amount, the amount of antioxidant is 500ppm. The amount of impurity-breaking initiator is 20ppm, and the amount of initiator is according to formula I: m Initiator =64.06×m / (Mn×C)

[0044] Where m Initiator Is the mass of the initiator; m is the mass of styrene and isoprene monomers; Mn is the average molecular weight of the designed SIS; C is the mass percentage concentration of the initiator.

[0045] The production of SIS products is completed in a 10L reactor, and the amount of each component is calculated according to the requirements of the above re...

Embodiment 2

[0051] In this embodiment, it is assumed that SIS products with a molecular weight of 100,000 to 130,000 are produced, and the styrene content is 18%. The volume of cyclohexane used is 60% of the total volume of the reactor, the dosage of tetrahydrofuran is 81ppm, the total monomer dosage of styrene and isoprene is 15% of the total mass of the reaction system, and the dosage of the terminator is the initiator. 1.2 times the total amount, the amount of antioxidant is 750pm. The amount of impurity-breaking initiator is 25ppm, and the amount of initiator is based on formula I: m Trigger Agent =64.06×m / (Mn×C)

[0052] Where m Initiator Is the mass of the initiator; m is the mass of styrene and isoprene monomers; Mn is the average molecular weight of the designed SIS; C is the mass percentage concentration of the initiator.

[0053] The production of SIS products is completed in a 10L reactor, and the amount of each component is calculated according to the requirements of the above ...

Embodiment 3

[0059] In this embodiment, it is assumed that SIS products with a molecular weight of 100,000 to 130,000 are produced, and the styrene content is 20%. The volume of cyclohexane used is 60% of the total volume of the reactor, the dosage of tetrahydrofuran is 81ppm, the total monomer dosage of styrene and isoprene is 15% of the total mass of the reaction system, and the dosage of the terminator is the initiator. 1.2 times the total amount, the amount of antioxidant is 1000 pm of the total amount of initiator. The amount of impurity-breaking initiator is 30ppm, and the amount of initiator is according to formula I: m Initiator =64.06×m / (Mn×C)

[0060] Where m Initiator Is the mass of the initiator; m is the mass of styrene and isoprene monomers; Mn is the average molecular weight of the designed SIS; C is the mass percentage concentration of the initiator.

[0061] The production of SIS products is completed in a 10L reactor, and the amount of each component is calculated according t...

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Abstract

The invention discloses a preparation method of a low-mould shrinkage ratio polypropylene alloy material, which comprises the following two steps: (1) adopting an anionic polymerization method, taking n-butyl lithium as the initiator, tetrahydrofuran as the activator and styrene and isoprene as the monomer, preparing a PS-isoprene-styrene product; (2) putting 5 to 20 parts of PS-isoprene-styrene prepared in step (1), 60 to 80 parts of polypropylene resin, 2 to 10 parts of compatilizer, 200 to 1500ppm of nucleator and 500 to 2000ppm of antioxidant into a mixer to uniformly mix and prepare mixture; and then feeding the mixture into an extruder to extrude, cut into particles and dry, and obtain the polypropylene alloy material. The polypropylene alloy material has the mechanical property of ABS level, can be used for various plastic precision parts so as to replace ABS and realize universal plastic engineering.

Description

Technical field [0001] The invention relates to a method for preparing a polypropylene alloy material, in particular to a method for preparing a polypropylene alloy material with a low mold shrinkage rate. Background technique [0002] Styrene-isoprene-styrene block copolymer (SIS) is a sister product of styrene-butadiene-styrene block copolymer (SBS), both of which are important varieties of styrene thermoplastic elastomers . SIS is a new generation of thermoplastic elastomers (USP 3239478, USP 3333024, USP 4096203, USP 3427269, USP 3507934) that were simultaneously developed and industrialized by Phillips Petroleum Company and Shell Chemical Company in the 1960s. It has excellent corrugated sealability and high temperature retention, and its unique microscopic phase separation structure determines its superiority when used as an adhesive. The pressure-sensitive adhesive and hot melt adhesive formulated are widely used in medical, electrical insulation, Packaging, protection a...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08L53/02C08L51/06C08L51/10C08F297/04
Inventor 王贤文吴浩刘振地莫益燕林茂
Owner CHINA PETROLEUM & CHEM CORP
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