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Transparent LLDPE (linear low density polyethylene) thin-film resin and thin film prepared from same

A film resin, transparent technology, applied in the field of transparent and easy-to-process LLDPE film resin, can solve the problems of low production cost, and achieve the effects of increasing molecular weight, refining crystals, and good transparency

Inactive Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a lack of a transparent and easy-to-process film base resin with a wide molecular weight distribution, a unique short-chain branch structure and a small amount of long-chain branch structure. Film resins with uniform quality and low production costs

Method used

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  • Transparent LLDPE (linear low density polyethylene) thin-film resin and thin film prepared from same
  • Transparent LLDPE (linear low density polyethylene) thin-film resin and thin film prepared from same
  • Transparent LLDPE (linear low density polyethylene) thin-film resin and thin film prepared from same

Examples

Experimental program
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Effect test

preparation example Construction

[0066] Catalyst preparation:

[0067] Using Al 2 o 3 , titanium and F modified porous inorganic carrier SiO 2 Carrier (the carrier can also be replaced by zirconia or thorium oxide), through the step-by-step or co-impregnation method, the vanadium source is impregnated in the porous inorganic carrier SiO 2 on a silica gel carrier to obtain the desired modified catalyst. Immerse about 10-15g of porous silica gel modified by Ti, Al, F, V in basic chromium acetate aqueous solution, wherein the chromium load is 0.1-1wt% of the total weight of the catalyst, after continuous stirring for 3-8 hours , heat up and dry, then roast the silica gel carrier loaded with basic chromium acetate in a fluidized bed at high temperature, remove the physical water of the carrier at the low temperature section, and remove the hydroxyl groups on the silica gel surface at the high temperature section of 500°C-900°C, This high temperature section is maintained for 5-8 hours, and finally under the p...

Embodiment 1

[0071] Add ethylene, 1-butene, 1-hexene, hydrogen, oxygen, nitrogen and a modified supported chromium-based catalyst into a single gas-phase fluidized bed reactor, according to 1-butene and 1-hexene / ethylene The molar ratio is 0.03:1, the molar ratio of 1-butene / 1-hexene is 1:1, the molar ratio of hydrogen to ethylene is 0.001, the oxygen concentration is 140ppb, the polymerization temperature is 80°C, the polymerization pressure is 1.8MPa, and the circulating gas The polymerization reaction was carried out under the technical conditions of speed of 0.60m / s, catalyst addition of 2g / h, and residence time of 2h.

Embodiment 2

[0073] Add ethylene, 1-butene, 1-hexene, hydrogen, oxygen, nitrogen and a modified supported chromium-based catalyst into a single gas-phase fluidized bed reactor, according to 1-butene and 1-hexene / ethylene The molar ratio is 0.03:1, the molar ratio of 1-butene / 1-hexene is 1:1.5, the molar ratio of hydrogen to ethylene is 0.002, the oxygen concentration is 120ppb, the polymerization temperature is 82°C, the polymerization pressure is 1.9MPa, and the circulating gas The polymerization reaction was carried out under the technical conditions of speed of 0.62m / s, catalyst addition of 2g / h, and residence time of 2h.

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Abstract

The invention discloses transparent LLDPE (linear low density polyethylene) thin-film resin and a thin film prepared from the same. The resin is prepared from ethylene, 1-butene and 1-hexene through copolymerization, the structure of a resin compound is shown in the description, wherein n1 is larger than or equal to 20 and smaller than or equal to 25, n2 is larger than or equal to 25 and smaller than or equal to 250, n3 is larger than or equal to 1 and smaller than or equal to 20, R1 is -CH2CH3 or -CH2CH2CH2CH3, R2 is -(CH2)mCH3, m is larger than or equal to 100, and R1 in the resin compound is not all -CH2CH3 and is not all -CH2CH2CH2CH3. The thin-film resin has a structure with broad molecular weight distribution, unique short branched chains and a few long branched chains, and by meansof the structure, shear sensitivity of a product and crystallization morphology can be improved, so that the resin shows better transparency and machinability, has good overall performance, can be used in the thin-film fields of packaging films, wrapping films and the like with special requirements and is practical and functional thin-film resin.

Description

technical field [0001] The invention relates to a film resin, in particular to a transparent and easy-to-process LLDPE film resin. Background technique [0002] LLDPE (linear low-density polyethylene) film resin is mainly used to produce agricultural film and packaging film. In recent years, with the development of my country's light industry export business, the consumption of film-grade LLDPE has grown steadily. In 2015, the apparent consumption of LLDPE film material was 4.8 million tons , the demand for high-strength and high-transparency LLDPE is 200,000 tons per year, mainly replacing LDPE materials on the market. [0003] LLDPE is a copolymer of ethylene and α-olefin. The introduction of α-olefin monomer makes the polymer contain a considerable number of branched chains. These branched chains of different lengths directly affect the performance of the polymer. The molecular chain of LLDPE is linear and has highly branched short chains, so its crystallinity is low. Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/08C08F210/14C08F2/34C08F2/38C08F4/02C08F4/62C08F4/22
CPCC08F210/16C08J5/18C08J2323/08C08F210/08C08F210/14C08F2500/04C08F2500/09C08F2500/10C08F2/34C08F2/38C08F4/62C08F4/025C08F4/22
Inventor 李瑞杨国兴赵兴龙高宇新宋磊张明强安彦杰张德英葛腾杰王世华国海峰王登飞孙彬彬郭峰杨晓东吕红丽任合刚王华任鹤王文燕
Owner PETROCHINA CO LTD