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Ultra-high molecular weight polyethylene micro-porous membrane and preparation method thereof

A technology of polyethylene microporous membrane and ultra-high molecular weight, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of affecting phase separation size, reducing production efficiency, and low temperature of quenching roll, and achieves Improve compression resistance and heat distortion temperature, improve production stability, and increase the effect of line speed

Inactive Publication Date: 2015-12-23
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallization rate is slow due to the many entanglement points of ultra-high molecular weight polyethylene molecular chains, which seriously affects the phase separation size
At the same time, the thickness of the cast film is thick, and it is difficult to ensure the consistency of the melt cooling in the transverse direction and the thickness direction, which easily leads to a large difference in the pore structure of the microporous film in the transverse direction and the thickness direction, which greatly affects the performance of the battery. Production and battery performance
Generally, in order to ensure the rapid cooling of the melt, the casting speed of ultra-high molecular weight polyethylene microporous film is low during industrial production, and the temperature of the quenching roll is low, which greatly reduces the production efficiency. At the same time, the low temperature cooling roll is easy to cause condensation on the roll surface Water will affect the normal production

Method used

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  • Ultra-high molecular weight polyethylene micro-porous membrane and preparation method thereof
  • Ultra-high molecular weight polyethylene micro-porous membrane and preparation method thereof
  • Ultra-high molecular weight polyethylene micro-porous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to 0.3 parts of nucleating agent DBS (1,3:2,4-dibenzylidene sorbitol) and 1 part of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl)propane Isooctanol ester), 0.05 parts of auxiliary antioxidant (pentaerythritol distearyl diphosphite) and 233 parts of paraffin oil are blended in the ultrasonic generator to form a mixture A. Add the above-mentioned mixed solution A and the dried UHMWPE powder into the first extruder at a ratio of 235 parts: 100 parts, and blend them uniformly under high temperature and strong shear.

[0035] According to 0.3 part of nucleating agent CNT (carbon nanotube) and 1 part of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate), 0.05 part of auxiliary antioxidant Agent (pentaerythritol distearyl diphosphite) and 233 parts of paraffin oil are blended in the ultrasonic generator to form a mixture B. Add the above-mentioned mixed solution B and the dried UHMWPE powder into the second extruder at a ratio of 235 parts: 10...

Embodiment 2

[0040] According to 0.3 parts of nucleating agent DBS (1,3:2,4-dibenzylidene sorbitol) and 1 part of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl)propane Isooctanol ester), 0.05 parts of auxiliary antioxidant (pentaerythritol distearyl diphosphite) and 233 parts of paraffin oil are blended in the ultrasonic generator to form a mixture A. Add the above-mentioned mixed solution A and the dried UHMWPE powder into the first extruder at a ratio of 235 parts: 100 parts, and blend them uniformly under high temperature and strong shear.

[0041] According to 0.3 parts of nucleating agent HPN-68 (1,3:2,4-dibenzylidene sorbitol) and 1 part of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) ) Isooctyl propionate), 0.05 parts of co-antioxidant (pentaerythritol distearyl diphosphite) and 233 parts of paraffin oil are blended in the ultrasonic generator to form a mixture B. Add the above-mentioned mixed solution B and the dried UHMWPE powder into the second extruder at a ratio of 235 ...

Embodiment 3

[0044] According to 1 part of nucleating agent SiO 2 (Silica) and 1 part of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate), 0.05 parts of auxiliary antioxidant (pentaerythritol diphosphite) Stearyl alcohol ester) and 233 parts of paraffin oil are blended in the ultrasonic generator to form a mixture A. Add the above-mentioned mixed solution A and the dried UHMWPE powder into the first extruder at a ratio of 235 parts: 100 parts, and blend them uniformly under high temperature and strong shear.

[0045] According to 1 part of nucleating agent NA-11 (1,3:2,4-dibenzylidene sorbitol) and 1 part of antioxidant (β-(3,5-di-tert-butyl-4-hydroxyphenyl) ) Isooctyl propionate), 0.05 parts of co-antioxidant (pentaerythritol distearyl diphosphite) and 233 parts of paraffin oil are blended in the ultrasonic generator to form a mixture B. Add the above-mentioned mixed solution B and the dried UHMWPE powder into the second extruder at a ratio of 235 parts: 100 parts, an...

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Abstract

The invention relates to an ultra-high molecular weight polyethylene micro-porous membrane and a preparation method thereof. The thickness of the micro-porous membrane is smaller than or equal to 40 microns, the porosity is 35-70%, the average pore size is 20-100 nanometers, the longitudinal / transverse tensile strength is greater than or equal to 160 Ma, and longitudinal / transverse elongation at break is greater than or equal to 50%. After the micro-porous membrane is arranged in a drying oven at the temperature of 120 DEG C for 1 hour, the longitudinal / transverse thermal shrinkage of the micro-porous membrane is smaller than or equal to 5. The ultra-high molecular weight polyethylene micro-porous membrane prepared by means of the preparation method is of a multi-layer structure, the anti-compression capacity and heat-resisting deformation temperature of the ultra-high molecular weight polyethylene micro-porous membrane can be effectively improved, the strength of the micro-porous membrane is improved, and the microstructure consistency of the micro-porous membrane is improved. In addition, the speed of a production line can be effectively improved, and the requirement for production speed can be met by normal-temperature soft water replacing chilled water.

Description

Technical field [0001] The invention relates to a microporous membrane product, in particular to a composite microporous membrane with the characteristics of high heat-resistant deformation temperature, uniform structure, etc., and a preparation method with higher production line speed. Background technique [0002] The function of the lithium ion battery is to isolate the positive and negative electrodes during the battery use, prevent the two poles from contacting and short-circuit, and at the same time provide channels for the ions in the electrolyte. Lithium-ion batteries have many requirements for separators, such as chemical resistance, liquid absorption, good mechanical properties, uniform thickness, and high consistency of porosity and pore size. [0003] Polyolefin has good chemical stability and excellent physical properties. Its microporous membrane diaphragm is widely used in batteries, capacitors, water treatment, water desalination, biomedical and medical fields, espe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/02B01D67/00
Inventor 王郗高东波刘瑞陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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