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High-hexene grafted high-density polyethylene geomembrane blow-molding material

A technology for copolymerizing polyethylene with high-density polyethylene and ethylene-hexene is applied in the field of high-hexene-grafted high-density polyethylene geomembrane blow molding materials, which can solve the difficulty of breaking through the lower density limit of geomembrane special materials and reduce the conversion rate of special materials , Lawrence pump power sudden increase and other problems, to achieve excellent environmental stress cracking resistance, improve production stability, reduce the effect of sticking to the wall

Active Publication Date: 2015-07-01
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-density polyethylene is produced by the loop slurry process. Since the reaction system is a slurry system, when a high concentration of 1-hexene monomer is introduced, the reaction system is likely to be sticky and the reaction is prone to fouling.
The phenomenon of reaction scaling refers to the phenomenon that the viscosity of the reaction system is too high, and it is easy to stick to the wall, so that the actual temperature of the reactor becomes higher, which obviously deviates from the set value, and at the same time, due to the inability to dissipate heat due to the heat of reaction, the temperature of the jacket water decreases. Lawrence Pump Power Sudden Increase, Response Fluctuates
However, after the reaction scaling occurs, it is easy to gather violently during production, and the production is difficult to control
Therefore, it is very difficult for the geomembrane special material produced by the loop pipe slurry process to break through 0.939g / cm 3 The lower limit of the density
A large number of transition material products are prone to appear during production, which reduces the conversion rate of special materials and reduces output

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of ethylene-hexene copolymerized polyethylene resin:

[0035] The diluent isobutane is always in a circulating state. The monomers ethylene and 1-hexene are injected into the loop reactor respectively, and the antistatic agent ASA and the activated NTR-975 chromium catalyst are added for reaction. The reaction temperature is 92.8 ℃, ethylene feed rate 38t / h, 1-hexene feed rate 1440 kg / h, catalyst feed rate 149 kg / h, isobutane feed rate 38.0 kg / h, antistatic agent 0.39 kg / h, reacted to the reaction product The melt flow rate is 11.9g / 10min and the density is 0.937~0.939kg / m 3 , stop the reaction to obtain ethylene hexene copolymerized polyethylene resin.

[0036] Raw material (parts by weight) of geomembrane blow molding material:

[0037] Ethylene hexene copolymerized polyethylene resin 99.55 parts

[0038] Antioxidant 0.45 parts

[0039] Wherein the antioxidant is tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester.

[0040...

Embodiment 2

[0043] Preparation of ethylene-hexene copolymerized polyethylene resin:

[0044] The diluent isobutane is always in a circulating state. The monomers ethylene and 1-hexene are injected into the loop reactor respectively, and the antistatic agent ASA and the activated NTR-975 chromium catalyst are added for reaction. The reaction temperature is 93.7 ℃, ethylene feed rate 38t / h, 1-hexene feed rate 1897 kg / h, catalyst feed rate 169 kg / h, isobutane feed rate 38.6 kg / h, antistatic agent 0.56 kg / h, reacted to the reaction product The melt flow rate is 12.3g / 10min and the density is 0.938kg / m 3 , stop the reaction to obtain ethylene hexene copolymerized polyethylene resin.

[0045] Raw material (parts by weight) of geomembrane blow molding material:

[0046] Ethylene hexene copolymerized polyethylene resin 99.70 parts

[0047] Antioxidant 0.30 parts

[0048] Wherein the antioxidant is tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester.

[0049] Prep...

Embodiment 3

[0052] Preparation of ethylene-hexene copolymerized polyethylene resin:

[0053] The diluent isobutane is always in a circulating state. The monomers ethylene and 1-hexene are injected into the loop reactor respectively, and the antistatic agent ASA and the activated NTR-975 chromium catalyst are added for reaction. The reaction temperature is 95.2 ℃, ethylene feed rate 36t / h, 1-hexene feed rate 2059 kg / h, catalyst feed rate 198 kg / h, isobutane feed rate 36 kg / h, antistatic agent 0.36 kg / h, react until the reaction product The melt flow rate is 12.6g / 10min and the density is 0.937kg / m 3 , stop the reaction to obtain ethylene hexene copolymerized polyethylene resin.

[0054] Raw material (parts by weight) of geomembrane blow molding material:

[0055] Ethylene hexene copolymerized polyethylene resin 99.80 parts

[0056] Antioxidant 0.20 parts

[0057] Wherein the antioxidant is tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester.

[0058] Pre...

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Abstract

The invention discloses a high-hexene grafted high-density polyethylene geomembrane blow-molding material, of which the weight-average molecular weight is 200000-300000, the melt flow rate is 10.0-13.0g / 10min, the density is 0.937-0.937 kg / m<3>, the 1-hexene content is greater than or equal to 1.20%, and the crystallinity is 46.5-49.5%. The blow-molding material mainly comprises the following raw materials in parts by weight: 99.5-99.9 parts of an ethylene / hexene copolymerized polyethylene resin, and 0.20-0.50 part of a composite antioxidant. The geomembrane blow-molding material is relatively high in hexene content and molecular weight, broad in molecule weight distribution, more in long-branch chain, and good in rigid-tough balance, environmental stress cracking resistance, creep resistance, oxidation resistance and chemical corrosion resistance, and therefore, the geomembrane blow-molding material is applicable to the machine shaping of various geomembranes, especially rough surface membranes.

Description

technical field [0001] The invention relates to a geotechnical film blowing material, in particular to a geotechnical film blowing material grafted with high-hexene high-density polyethylene. Background technique [0002] High-density polyethylene geomembrane is a new type of anti-seepage material with high anti-seepage coefficient. It can be used alone as an anti-seepage material or combined with non-woven fabric to make a composite anti-seepage membrane. High-density polyethylene geomembrane has good heat resistance, cold resistance, and aging resistance. When used, it is not limited by the ambient temperature of the area. It can be used exposed for a long time while maintaining the original performance. If it is buried and laid, the service life longer. [0003] Compared with advanced countries in the world, the application of geomembrane materials in my country started relatively late. At present, the high-density polyethylene geomembrane materials commonly used in the...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K5/134C08F210/16C08F210/14C08F4/69
CPCC08F210/16C08J5/18C08J2323/08C08L23/0815C08L2201/08C08L2203/16C08L2207/062C08F210/14C08F2500/01C08F2500/04C08F2500/07C08F2500/09C08L51/003C08K5/1345C08F4/69
Inventor 岑静芸钟向宏蔡伟梁戈杜刚梁胜彪钟朝云许敏谭捷
Owner CHINA PETROLEUM & CHEM CORP