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Polyolefin composition and preparation method thereof, and polyolefin material

A technology of polyolefin and composition, which is applied in the field of polyolefin materials, can solve the problems of low molding shrinkage, difficult to take into account at the same time, high haze, etc., and achieve the effect of low molding shrinkage and haze

Active Publication Date: 2018-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of transparency and mold shrinkage, it is difficult to balance
For example, the disclosed polyolefin composition of CN101541879A has lower molding shrinkage, but the haze of the composition is higher

Method used

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  • Polyolefin composition and preparation method thereof, and polyolefin material
  • Polyolefin composition and preparation method thereof, and polyolefin material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0028] According to a preferred embodiment, the MFR of the propylene / 1-butene copolymer measured under the conditions of 230° C. and 2.16 kg is 20-30 g / 10 min.

[0029] In the present invention, as the dispersed phase in the polyolefin composition, the ethylene / 1-butene copolymer is an elastic copolymer, and the elastic copolymer has a good phase relationship with the ethylene / 1-butene copolymer. Compatibility, so as to ensure that the material prepared from the polyolefin composition can meet relatively high comprehensive mechanical properties, and at the same time have good optical properties and processability.

[0030] Preferably, the MFR of the polyolefin composition measured under the conditions of 230° C. and 2.16 kg is 10-20 g / 10 min.

[0031] In the polyolefin composition, the intrinsic viscosity of the part soluble in xylene at room temperature is usually 0.8-1.5 dL / g, preferably 0.9-1.3 dL / g.

[0032] According to the present invention, the content of the polyolefi...

Embodiment 1

[0090] This example is used to illustrate the polyolefin composition and its preparation method and polyolefin material of the present invention.

[0091] 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.

[0092] The polymerization reaction was carried out on a polypropylene pilot plant.

[0093] Polymerization method and steps are as follows:

[0094] 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-polymerizatio...

Embodiment 2

[0101] This example is used to illustrate the polyolefin composition and its preparation method and polyolefin material of the present invention.

[0102] The polyolefin composition and polyolefin material were prepared according to the method of Example 1, except that the amount of reactants was adjusted so that the concentration of butene detected by online chromatography in the loop reactor was 5 mol%, and the concentration of hydrogen was 0.32 mol%. The specific process conditions and the composition of the polyolefin composition are shown in Table 1, and the properties of the polyolefin material are shown in Table 2.

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Abstract

The invention belongs to the field of polyolefins, and particularly relates to a polyolefin composition and a preparation method thereof, and a polyolefin material. The polyolefin composition contains: (a) 55-80 wt% of a propylene / 1-butene copolymer, and (b) 20-45 wt% of an ethylene / 1-butene copolymer, wherein the 1-butene content in the propylene / 1-butene copolymer is not higher than 5 wt%, the MFR determined at a temperature of 230 DEG C under a 2.16 kg condition is 20-50 g / 10 min, the 1-butene content in the ethylene / 1-butene copolymer is 20-30 wt%, the polyolefin composition can be partially dissolved in xylene at a room temperature, and the xylene soluble substance content is 50-70 wt%. Compared to the existing polypropylene material using the homo-polypropylene or the propylene and ethylene crystal copolymer as the continuous phase or matrix and using the ethylene / butene-1 copolymer as the disperse phase, the polyolefin material of the present invention has low molding shrinkageand low haze.

Description

technical field [0001] The invention belongs to the field of polyolefin materials, and in particular relates to a polyolefin composition, a preparation method of the 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 specific gravity of polypropylene after crystallization increases and the volume shrinks, so polypropylene 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 interio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/08C08F210/06C08F210/02C08F210/08C08F2/38
CPCC08F2/38C08F210/02C08F210/06C08L23/14C08L2308/00C08L23/0815C08F210/08
Inventor 宋文波邹发生张晓萌胡慧杰邹浩邹杰
Owner CHINA PETROLEUM & CHEM CORP
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