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Polyethylene resin, preparation method and applications thereof

A technology of polyethylene resin and ethylene, which is applied in the field of high chlorinated polyethylene, can solve the problems of adverse effects on the solubility of HCPE, uneven distribution of product particles, and increased raw material costs, and achieve narrow molecular weight distribution index, good chlorination performance, Excellent solubility effect

Inactive Publication Date: 2017-02-01
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this increases the cost of raw materials. On the other hand, traditional low-molecular-weight polyethylene contains more polyethylene wax, which is easily melted in advance during the chlorination process, resulting in stickiness between particles, resulting in product particle distribution. Inhomogeneity and uneven chlorination will adversely affect the solubility of HCPE. In severe cases, the reactants will stick together in the kettle during the chlorination process, causing accidents.

Method used

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  • Polyethylene resin, preparation method and applications thereof
  • Polyethylene resin, preparation method and applications thereof

Examples

Experimental program
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preparation example Construction

[0034] The preparation of HCPE in the examples is prepared by the aqueous phase suspension method. Specifically, 0.2 parts of dispersant (polyvinyl alcohol), 0.005 parts of suspension stabilizer (ethylene oxide propylene oxide copolymer), 0.005 parts of emulsifier (octylphenol poly Oxyethylene ether) 0.03 parts, add the PE resin powder (5-5.5 parts) for HCPE under the stirring condition, after fully stirring, heat to 35-45 ℃ through the hot water of the jacket, then add the initiator into the heated water Agent dibenzoyl peroxide (BPO) 0.02~0.03 parts, initiator dicumyl peroxide (DCP) 0.015~0.025 parts, continue heating to 60°C under sealed conditions, and pass through the water after the second temperature rise. Into chlorine, the total amount of chlorine is 22 parts by weight. The chlorination process is carried out in three stages. The first stage feeds 55% of the total amount of chlorine gas and reacts for 2.5 to 3 hours at a temperature of 75-88°C and a pressure of <0.2M...

Embodiment 1

[0039] According to the PE resin for HCPE of the present invention, prepare as follows: 1) add 200 liters of hexane solvents in 300 liters of reactors; Rinse through 1L hexane, add loaded metallocene catalyst and cocatalyst triethyl Aluminum (hexane solvent, the concentration is 0.88mol / L), start the stirring, the stirring speed is 250rpm, and at the same time heat the material in the reactor to 70-85°C through the external circulating water;

[0040] 2) Add 5 grams of hydrogen into the reactor at one time, continuously feed ethylene, and add 200 g of comonomer 1-butene in batches at the same time; adjust the feeding of ethylene to maintain the pressure in the reactor at 0.5-0.8 MPa for slurry polymerization 2 Hour, the total addition of ethylene in this process is 22kg.

[0041] 3) After the reaction is over, stop feeding ethylene, reduce the temperature of the material in the reactor to 25°C through external circulating water, vent the pressure in the reactor, release the po...

Embodiment 2

[0044] The difference from Example 1 is:

[0045] The solvent is changed into isobutane, and the hydrogen addition is 4 grams, and the comonomer butene-1 is changed into hexene-1, and the addition is changed into 75 grams;

[0046] The test results of this polyethylene resin are shown in Table 1; the properties of polyethylene resin chlorinated products are shown in Table 2.

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Abstract

The present invention provides a polyethylene resin having a low wax content, wherein the density is 0.935-0.960 g / cm<3>, the melt flow rate is 25-120 g / 10 min, the average particle size is 100-200 [mu]m, the bulk density is not less than 0.39 g / cm<3>, the weight average molecular weight Mw is 3.2-5.2*10<4> g / mol, the molecular weight distribution index Mw / Mn is 2.3-2.8, and the polyethylene wax content is not higher than 3.5%. The present invention further provides a preparation method of the high-density polyethylene resin, wherein polymerization is performed through a slurry polymerization reaction in the presence of a co-catalyst by adopting a supported metallocene catalyst as a main catalyst. According to the present invention, the prepared polyethylene resin has good chlorination performance, the solubility of the chlorination product is superior to the existing traditional HCPE chloride, and the polyethylene resin can be used for preparing chlorinated polyethylene adopted as the coating material.

Description

technical field [0001] The present invention relates to an ethylene polymer resin, its preparation method and its use in the preparation of high chlorinated polyethylene used as coating. Background technique [0002] Chlorinated polyethylene (CPE) is a chlorinated product of polyethylene (PE), in which PE is deeply chlorinated to obtain CPE with a chlorine content greater than 60%, which is usually called highly chlorinated polyethylene (HCPE). Due to the saturation, spatial distribution and high chlorine content of molecular chains, HCPE is endowed with excellent mineral oil resistance, corrosion resistance, weather resistance and water resistance. In addition, the chlorine atom is a strong polar group, which is randomly distributed in the molecular chain, so it enhances the polarity of the coating and helps to improve the adhesion, strength, heat resistance and solvent resistance of the coating. HCPE also has the advantages of excellent flame retardancy, easy dissolution,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F210/16C08F2/00C08F4/6592C08F8/22C09D123/28
Inventor 左胜武梅利邱敦瑞徐振明傅勇袁小亮尚小杰
Owner SINOPEC YANGZI PETROCHEM
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