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A composition for toughening and modifying polypropylene and its modified polypropylene

A technology of toughening and modification, polypropylene, applied in the field of polypropylene, can solve the problems affecting the safe production of PPR pipelines, living needs, affecting the construction and installation of PPR pipelines, large loss of tensile strength of modified materials, etc. Secondary crystallization phenomenon, fine crystal grains, and the effect of eliminating residual stress

Active Publication Date: 2020-09-15
宁波市鄞州骁业汽车零部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount reaches 10-12wt%, the tensile strength of the modified material will be greatly lost
Due to the high brittleness of PPR pipes at low temperatures (10 to -40°C), stress-induced cracking is very easy to occur, which has seriously affected the construction and installation of PPR pipes for many years, and seriously affected the water delivery system of PPR pipes under low temperature conditions. Safety and people's daily production and living needs urgently require great effort to solve
However, the toughening effect of existing toughening agents used for toughening and modifying polypropylene is not outstanding, and the low temperature adaptability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, the homopolypropylene is toughened and modified using the composition for toughening and modifying polypropylene, and the modified polypropylene consists of 1 part by weight of the composition for toughening and modifying polypropylene and 16 parts by weight of the homopolypropylene Polypropylene was mixed and granulated through a twin-screw granulator, and the extruder barrel temperature was 216°C.

[0020] Wherein, the composition for toughening and modifying polypropylene consists of the following components:

[0021] 55 parts by weight of linear low density polyethylene;

[0022] 10 parts by weight of ethylene butadiene copolymer;

[0023] 10 parts by weight of ethylene octene copolymer;

[0024] 55-60 parts by weight homopolypropylene;

[0025] 0.6 parts by weight lanthanum stearate;

[0026] 0.1 parts by weight initiator, described initiator is made up of 10 parts by weight di-t-butyl peroxide, 10 parts by weight diacetyl peroxide and 10 parts...

Embodiment 2

[0032] In this example, the homopolypropylene is toughened and modified using the composition for toughening and modifying polypropylene, and the modified polypropylene consists of 1.5 parts by weight of the composition for toughening and modifying polypropylene and 17.5 parts by weight of the homopolymer Polypropylene was mixed and granulated through a twin-screw granulator, and the barrel temperature of the extruder was 217°C.

[0033] Wherein, the composition for toughening and modifying polypropylene consists of the following components:

[0034] 56 parts by weight of linear low density polyethylene;

[0035] 11 parts by weight of ethylene butadiene copolymer;

[0036] 11 parts by weight of ethylene octene copolymer;

[0037] 56.2 parts by weight homopolypropylene;

[0038] 1.2 parts by weight lanthanum stearate;

[0039] 0.13 parts by weight initiator, described initiator is made up of 10 parts by weight di-t-butyl peroxide, 20 parts by weight diacetyl peroxide and 20...

Embodiment 3

[0045] In this example, the homopolypropylene is toughened and modified using the composition for toughening and modifying polypropylene, and the modified polypropylene consists of 1.5 parts by weight of the composition for toughening and modifying polypropylene and 18 parts by weight of Polypropylene was mixed and granulated through a twin-screw granulator, and the barrel temperature of the extruder was 217°C.

[0046] Wherein, the composition for toughening and modifying polypropylene consists of the following components:

[0047] 57.5 parts by weight of linear low density polyethylene;

[0048] 12 parts by weight of ethylene butadiene copolymer;

[0049] 11.8 parts by weight of ethylene octene copolymer;

[0050] 57 parts by weight homopolypropylene;

[0051] 1.8 parts by weight lanthanum stearate;

[0052] 0.15 parts by weight initiator, described initiator is made up of 10 parts by weight di-t-butyl peroxide, 20 parts by weight diacetyl peroxide and 30 parts by weight...

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Abstract

The invention discloses a composition for toughening and modifying polypropylene and modified polypropylene. The composition for toughening and modifying the polypropylene is prepared from the following components in parts by weight: 55 to 60 parts of linear low-density polyethylene, 10 to 15 parts of styrene-butadiene copolymer, 10 to 15 parts of ethylene-octene copolymer, 55 to 60 parts of polypropylene, 0.6 to 3 parts of lanthanum stearate, 0.1 to 0.25 part of initiator, 1 to 2 parts of antioxidant, 2 to 5 parts of liquid polybutadiene and 2 to 3 parts of alkylenecarboxylic acid with a carbon chain length more than 5 carbons; and the alkylenecarboxylic acid is a mixture of the alkylenecarboxylic acid with a carbon chain comprising one carbon-carbon dual-bond. By adopting the composition, the low-temperature adaptability and low-temperature resistance of the polypropylene can be effectively improved, and the application safety of a PPR pipeline made of the modified polypropylene canalso be improved.

Description

technical field [0001] The invention relates to the field of polypropylene, in particular to a composition for toughening and modifying polypropylene and its modified polypropylene. Background technique [0002] Polypropylene (PP) is a polyolefin material with excellent performance. Its output and product volume rank second among general-purpose resins, and it is the product with the best heat resistance among general-purpose resins. , building materials and furniture have a wide range of applications. The disadvantage of polypropylene is notch sensitivity, poor notch impact strength, and low temperature brittleness are particularly prominent. Usually, people usually use ethylene propylene diene monomer (EPDM) and ethylene-octene copolymer (POE) to improve the notched impact strength of polypropylene. But when the usage amount reaches 10-12wt%, the tensile strength of the modified material loses a lot. Due to the high brittleness of PPR pipes at low temperatures (10 to -4...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/08C08L47/00C08L33/02C08K5/00C08K5/098
CPCC08L23/0815C08L23/12C08L2203/18C08L2205/025C08L2205/035C08L23/083C08L47/00C08L33/02C08K5/00C08K5/098
Inventor 顾良勇许燕芬
Owner 宁波市鄞州骁业汽车零部件有限公司
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