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MPP pipe extrusion molding process

An extrusion molding and process technology, applied in the field of pipe processing, can solve the problems of low rigidity, loss of high rigidity and high thermal deformation of PP, and low content of PP material, achieve high tensile yield strength, and improve extrusion temperature. , Excellent hydraulic performance

Pending Publication Date: 2022-06-28
六安新兴塑管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The toughening of PP is mainly solved by copolymerization with ethylene or α-olefin or blending modification by adding elastomer components. Although this method can significantly improve the toughness of PP, it also obviously loses the inherent high rigidity of PP. and high heat deformability, it is sufficient to modify the crystal form of PP to transform the usual α crystal form PP into β crystal form, but under the existing process conditions, the PP material content of β crystal form is low, and its rigidity lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] S1: Mixing treatment: Determine the mixed base material and modifier material of the MPP pipe body, after weighing and drying, respectively, sucked into the hopper by the suction device according to the formula, and discharged into the high-speed mixer through the hopper for full mixing. form a mixture;

[0022] Specifically, the molding base material formula includes modified polypropylene base material, ethylene-propylene rubber, glass fiber and carbon fiber, wherein the ratio of modified polypropylene base material, ethylene-propylene rubber, glass fiber and carbon fiber is 50:10:5:2.

[0023] The specific preparation method of the modified polypropylene base material is as follows: ultrasonically mix propylene, ethylene, two different proportions of beta crystal nucleating agents, antioxidants and halogen absorbents in a high-speed mixer, and then add them to a polymerization kettle In the process, the gas phase polymerization method is used to carry out the polymer...

Embodiment 2

[0032] S1: Mixing treatment: Determine the mixed base material and modifier material of the MPP pipe body, after weighing and drying, respectively, sucked into the hopper by the suction device according to the formula, and discharged into the high-speed mixer through the hopper for full mixing. form a mixture;

[0033] Specifically, the molding base material formula includes modified polypropylene base material, ethylene-propylene rubber, glass fiber and carbon fiber, wherein the ratio of modified polypropylene base material, ethylene-propylene rubber, glass fiber and carbon fiber is 50:10:10:2.

[0034] The specific preparation method of the modified polypropylene base material is as follows: ultrasonically mix propylene, ethylene, two different proportions of beta crystal nucleating agents, antioxidants and halogen absorbents in a high-speed mixer, and then add them to a polymerization kettle In the process, the gas phase polymerization method is used to carry out the polyme...

Embodiment 3

[0043] S1: Mixing treatment: Determine the mixing base material and modifier material of the MPP pipe body, after weighing and drying, respectively, sucked into the hopper by the suction device according to the formula, and discharged into the high-speed mixer through the hopper for full mixing. form a mixture;

[0044] Specifically, the molding base material formula includes modified polypropylene base material, ethylene-propylene rubber, glass fiber and carbon fiber, wherein the ratio of modified polypropylene base material, ethylene-propylene rubber, glass fiber and carbon fiber is 50:10:5:5.

[0045] The specific preparation method of the modified polypropylene base material is as follows: ultrasonically mixing propylene, ethylene, two different proportions of beta crystal nucleating agents, antioxidants and halogen absorbents in a high-speed mixer, and then adding them to a polymerization kettle In the process, the gas phase polymerization method is used to carry out the ...

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PUM

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Abstract

The invention discloses an MPP pipe extrusion molding process which specifically comprises the following steps: S1, material mixing treatment: determining a mixed base material and a modifier material of an MPP pipe body to form a mixed material; s2, extrusion granulation: adding the mixture obtained in the step S1 into a twin-screw extrusion granulator to obtain MPP pipe body granules; according to the invention, the traction speed and the extrusion temperature of pipe body extrusion are improved, and meanwhile, a high-content beta crystal form modified polypropylene base material is mixed with ethylene propylene rubber, glass fibers and carbon fibers to form a mixed base material; the MPP pipe produced under the new process condition has higher tensile yield strength and higher impact resistance compared with a common MPP pipe, the wall thickness and corrugation of the pipe can save more raw materials under the condition that the product quality is guaranteed, the defects that an original MPP pipe is insufficient in toughness and heat resistance are overcome, the effects of impact resistance and external pressure resistance are achieved, and the service life of the MPP pipe is prolonged. The MPP pipe produced under the technological conditions is excellent in hydraulic pressure resistance.

Description

technical field [0001] The invention relates to a molding process, in particular to an MPP pipe extrusion molding process, and belongs to the technical field of pipe body processing. Background technique [0002] MPP pipe, also known as MPP power cable protection pipe, is divided into excavation type and trenchless type. MPP trenchless pipe is also called MPP pipe jacking or dragging pipe. MPP pipe uses modified polypropylene as the main raw material, which has high temperature resistance. , With the characteristics of resistance to external pressure, it is suitable for medium and low voltage transmission lines and cables below 10KV. MPP uses modified polypropylene as the main raw material. Construction works such as laying pipelines and cables in special areas such as the bottom of the riverbed. Compared with the traditional "groove buried pipe method", the trenchless power pipe project is more suitable for the current environmental protection requirements, and removes the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/16C08K7/14C08K7/06B29D23/00
CPCC08L23/142B29D23/001C08L2203/18C08L2201/08C08L23/16C08K7/14C08K7/06
Inventor 陈才杨正军杨成王要飞
Owner 六安新兴塑管有限公司