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Fractional crystallization analysis method of polyolefin resin

A polyolefin resin, fractional crystallization technology, applied in the analysis of materials, material crystallization, material thermal analysis and other directions, can solve the problems of inaccurate reaction of key properties, inconvenient selection of polyolefins, complex results, etc., to improve the accuracy of selection, Reduce time and cost, low cost effect

Inactive Publication Date: 2017-04-26
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can analyze the distribution of crystallized comonomers on the molecular chain. On the one hand, it takes a long time, and the results obtained for polyolefins with more complex crystallization behavior, such as polypropylene, are more complicated. For the preparation of lithium-ion batteries The choice of polyolefin for microporous membranes is inconvenient, and the results cannot accurately reflect the key properties of polyolefin raw materials for lithium-ion batteries

Method used

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  • Fractional crystallization analysis method of polyolefin resin
  • Fractional crystallization analysis method of polyolefin resin
  • Fractional crystallization analysis method of polyolefin resin

Examples

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Embodiment 1

[0033] The present embodiment provides a method for fractional crystallization analysis of polyolefin resins. The test raw material is polypropylene-1 (conforming to the requirements for preparing qualified microporous membranes for lithium-ion batteries), and the specific steps are as follows:

[0034] 1. The differential scanning calorimeter was turned on and preheated for 30 minutes, and 5 mg of the test sample was put into the test crucible. During the whole test process, N 2 Protect;

[0035] 2. Constant temperature at 50°C for 2 minutes;

[0036] 3. Raise the temperature to 220°C at a constant speed of 10°C / min, and keep the temperature constant for 6 minutes to eliminate the thermal history of the sample;

[0037] 4. Cool down to 165°C at a constant speed of 10°C / min, and keep the temperature constant for 80 minutes;

[0038] 5. Cool down to 50°C at a constant speed of 50°C / min;

[0039] 6. Raise the temperature to 148°C at a constant speed of 10°C / min, and keep the ...

Embodiment 2

[0046] This example provides a method for fractional crystallization analysis of polyolefin resins, the steps are the same as in Example 1, except that the test raw material is polypropylene-2.

Embodiment 3

[0048] This example provides a method for fractional crystallization analysis of polyolefin resins, the steps are the same as in Example 1, except that the test raw material is polypropylene-3.

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Abstract

The invention provides a fractional crystallization analysis method of polyolefin resin. The method comprises steps as follows: polyolefin resin is placed in a crucible of a differential scanning calorimeter, heated to 48-52 DEG C and kept at the constant temperature for 1-5 min; a product is heated to 210-230 DEG C, kept at the constant temperature for 4-10 min, cooled to 160-170 DEG C and kept at the constant temperature for 60-100 min; the product is cooled to 48-52 DEG C; the product is heated to 145-150 DEG C, kept at the constant temperature for 30-120 min and cooled to 48-52 DEG C; the product is heated to 120-140 DEG C, kept at the constant temperature for 30-80 min, cooled to 48-52 DEG C and kept at the constant temperature for 1-5 min; the product is heated to 180-220 DEG C, the heat flow change is recorded, and a fusion curve is obtained. Firstly, the method doesn't require a large quantity of solvents and is lower in cost and environment-friendly; secondly, the selection accuracy of raw materials is greatly improved, the test time is shortened, and the test cost is reduced; thirdly, the method is simple and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of fractional crystallization, in particular to a fractional crystallization analysis method for polyolefin resins. Background technique [0002] Since Sony successfully developed lithium-ion batteries in the early 1990s, lithium-ion batteries have developed rapidly due to their excellent electrical properties such as high energy density, long cycle life, and high voltage. At present, it has been widely used in the fields of electronic products such as mobile phones, portable computers, cameras, and video cameras, and the application fields are still expanding. Lithium-ion batteries consist of positive and negative electrodes, electrolytes and separators. Among them, an important function of the separator is to isolate the positive and negative electrodes and prevent the passage of electrons in the battery, while allowing the passage of ions, thereby completing the rapid transmission of lithium ions between...

Claims

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Application Information

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IPC IPC(8): G01N25/14
CPCG01N25/147
Inventor 杨雪梅陈勇高东波肖武华陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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