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A kind of polyolefin composition and polyolefin material

A technology of polyolefin and composition, which is applied in the field of polyolefin materials, can solve problems such as increased mold shrinkage anisotropy, poor processing performance of polypropylene, material molding and application limitations, etc., and achieves low mold shrinkage, Effect of high rigidity and shrinkage anisotropy reduction

Active Publication Date: 2021-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, in the field of plastic processing, although the addition of nucleating agents can improve the mechanical properties of polypropylene, it often leads to poor processing properties of polypropylene, especially the general increase in anisotropy of molding shrinkage, which makes the molding and App is restricted

Method used

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  • A kind of polyolefin composition and polyolefin material
  • A kind of polyolefin composition and polyolefin material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] According to one embodiment, the polyolefin component is produced by a process comprising the steps of:

[0036] 1) In the presence of an olefin polymerization catalyst, optionally in the presence of a molecular weight regulator, propylene, or propylene and ethylene and / or 1-butene are subjected to a first polymerization reaction to obtain a reactant stream containing component (a) ;

[0037] 2) In the presence of said reactant stream, optionally in the presence of a molecular weight regulator, ethylene and 1-butene are subjected to a second polymerization reaction to obtain the compound containing component (b) and component (a). the polyolefin components.

[0038] In the present invention, the molecular weight regulator is preferably hydrogen.

[0039] The olefin polymerization catalyst may be selected from Ziegler-Natta catalysts. The Ziegler-Natta catalyst may contain: an active solid catalyst component, an organoaluminum compound and an optional external electro...

Embodiment 1

[0087] This example serves to illustrate the polyolefin composition and polyolefin material of the present invention.

[0088] The titanium-containing active solid catalyst component (main catalyst) is prepared by the method described in Example 1 of CN93102795.0, its Ti content: 2.2% by weight, di-n-butyl phthalate (DIBP) content: 11.2% by weight.

[0089] The polymerization reaction was carried out on a polypropylene pilot plant.

[0090] Polymerization method and steps are as follows:

[0091] Pre-polymerization: After the main catalyst, co-catalyst (triethylaluminum (TEA)), external electron donor compound (methylcyclohexyldimethoxysilane (CHMMS)) was pre-contacted at 10°C for 20 minutes, the pre-polymerization was continuously added The reactor was subjected to a prepolymerization reaction, wherein the flow rate of TEA was 6 g / hr, the flow rate of CHMMS was 1.02 g / hr, and the flow rate of the main catalyst was 0.36 g / hr. The pre-polymerization is carried out in the bulk...

Embodiment 2

[0098] This example serves to illustrate the polyolefin composition and polyolefin material of the present invention.

[0099] The polyolefin composition and polyolefin material are prepared according to the method of Example 1, the difference is: the copolymerization reaction of propylene and ethylene is completed in the loop reactor, the ethylene concentration detected by online chromatography is 2mol%, and the hydrogen concentration is 0.48 mol%. The specific process conditions and the composition of the polyolefin components are shown in Table 1, and the properties of the polyolefin materials are shown in Table 2.

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Abstract

The invention belongs to the field of polyolefin, and in particular relates to a polyolefin composition and a polyolefin material. The polyolefin composition contains a polyolefin component and a nucleating agent; the polyolefin component comprises, component (a): 65-80% by weight of propylene homopolymer or propylene copolymer; and component (b) : 20-35% by weight of ethylene / 1-butene copolymer; said propylene copolymer contains at most 5% by weight of ethylene and / or 1-butene; 1-butene in ethylene / 1-butene copolymer The content is 20-30% by weight, and the xylene soluble content at room temperature is 50-70% by weight; the nucleating agent is HPN-20E. The flexural modulus of the polyolefin material is greater than 1050 MPa, the shrinkage rate in the transverse direction and the shrinkage rate in the longitudinal direction are both less than 0.8%, and the ratio of the two is below 1.1.

Description

technical field [0001] The invention belongs to the field of polyolefin materials, and in particular relates to a polyolefin composition and a polyolefin material. Background technique [0002] Polypropylene material has been widely used in the fields of automobiles, electronic appliances, medical materials, building materials and food packaging due to its low relative density, good mechanical properties and processing properties, high heat resistance and chemical corrosion resistance. However, as a crystalline polymer, the proportion of polypropylene after crystallization increases and the volume shrinks, so homopolypropylene often exhibits a large mold shrinkage rate, generally between 1.7-2.2%. The larger molding shrinkage means that the dimensional stability of the product is relatively poor, so polypropylene is limited in processing applications. For example, when polypropylene is used to produce automotive interior and exterior decoration products, if the problem of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/14C08L23/16C08L23/08C08K5/526C08K5/134C08K5/098
CPCC08L23/12C08L23/14C08L2205/02C08L2205/24C08L23/0815C08K5/526C08K5/1345C08K5/098
Inventor 邹发生宋文波张晓萌胡慧杰刘宣伯王路生
Owner CHINA PETROLEUM & CHEM CORP
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