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Modified fluorine-containing rheological agent for pipe material and use thereof

A rheological agent and modification technology, which is used in the field of modified fluorine-containing rheological agents for pipe materials, can solve the problems of lack of good polarity and loose structure, improve surface gloss, reduce extrusion torque, and reduce extrusion. the effect of stress

Inactive Publication Date: 2017-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, physical mixing of processing aids has many problems such as loose structure and poor polarity.

Method used

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  • Modified fluorine-containing rheological agent for pipe material and use thereof
  • Modified fluorine-containing rheological agent for pipe material and use thereof
  • Modified fluorine-containing rheological agent for pipe material and use thereof

Examples

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Effect test

preparation example Construction

[0034] The preparation of the modified fluorine-containing rheological agent of the present invention comprises the following experimental steps:

[0035] Step A: adopt the emulsion polymerization method, add deionized water, emulsifier and polar solvent into the high-pressure stirred reactor, close the reactor, and replace the air in the reactor with nitrogen several times. After the air is exhausted, the temperature of the system is raised to 40°C, and stirring is started. At this time, hexafluoropropylene, vinylidene fluoride, and tetrafluoroethylene are added to the reaction kettle in sequence and proportion, and then the initiator is added, and the temperature is raised to 120°C at the same time. As the reaction progresses, the pressure in the kettle will gradually drop, so during the reaction, a certain proportion of hexafluoropropylene, vinylidene fluoride, tetrafluoroethylene and initiators need to be continuously added to the reactor to maintain the The pressure is co...

Embodiment 1

[0043] Step A: Using the emulsion polymerization method, add 100 ml of deionized water, 2.8 grams of ammonium perfluorooctanoate, 18.2 grams of ammonium oxalate (or 2.0 grams of dodecyl alcohol with an HLB value of 12-18) into a high-pressure stirred reactor capable of holding 200 ml of water. polyoxyethylene ether or 1.8 grams of sodium lauryl sulfate), close the reactor, and replace the air in the reactor with nitrogen several times. After the air is exhausted, the system is heated to 40° C. and stirred at 200 rpm. , add hexafluoropropylene to the reactor pressure of 1.0MPa, add vinylidene fluoride to the reactor pressure of 2.0MPa, add tetrafluoroethylene to the reactor pressure of 4.0MPa, then add 4.5ml of 3% potassium persulfate solution to initiate polymerization, At the same time, the temperature rose to 120°C. As the reaction progressed, the pressure in the kettle dropped. During this period, tetrafluoroethylene / hexafluoropropylene (3 / 1 molar ratio), tetrafluoroethylene...

Embodiment 2

[0048] The synthesis steps of the modified fluorine-containing rheology agent are the same as in Example 1;

[0049] Add 0.1wt% of the above-mentioned modified fluorine-containing rheological agent to PE100+ pipe material resin, mix evenly, melt and extrude in the extruder, the extrusion temperature is 190°C, the extrusion time is 30min, and the extruder speed is 50r / min.

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Abstract

The invention relates to a modified fluorine-containing rheological agent for a pipe material. The modified fluorine-containing rheological agent is a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer grafted with a polar monomer and has a structural formula shown in the description. In the formula, Graft represents a polar monomer, M represents the molecular weight of the polar monomer, the sum of 100n, 150p, 64m and Mq is equal to 100, 100n is in a range of 35-75, 150p is in a range of 15-35, 64m is in a range of 10-30 and Mq is in a range of 1-5. The modified fluorine-containing rheological agent, PE100 and tube resin are homogeneously mixed in a mixer and the mixture is melted and extruded through an extruder so that the extrusion torque is decreased, the extrusion efficiency is improved, and rheological behavior in the PE100 and tube resin processing is improved.

Description

technical field [0001] The invention belongs to the field of processing aids for pipe materials, in particular to a modified fluorine-containing rheology agent for pipe materials and its application. Background technique [0002] PE100+ pipe material is an improved third-generation polyethylene pipe material developed in the 1980s, and its 50-year minimum hydrostatic strength is not less than 10MPa. Compared with PE100, the pressure resistance, rigidity and strength of PE100+ pipe material have been greatly improved. However, the processing performance of this pipe material in the pipe extrusion process is not very ideal. Generally, polyethylene resins with more high molecular weight fractions often have some processing defects during the melt extrusion process, such as "water lines" and "shark spots", etc., and to a lesser degree, the surface of the extruded pipe loses luster , the more serious ones are surface wrinkling; under higher shear stress, periodic melt fracture w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F259/08C08F214/28C08F214/22C08F214/26C08F2/26C08F2/30C08F2/46C08L23/06C08L51/00
Inventor 任鹤王俊宋磊王斯晗施伟光高宇新张瑞姜进宪方宏王华韦德帅王文燕孙彬彬杨琦李冬霞王立娟荣丽丽田炳全王东青
Owner PETROCHINA CO LTD
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