Low-molecular-weight polyvinyl chloride and preparation method thereof, sheath material and preparation method thereof

A polyvinyl chloride, low molecular weight technology, applied in the direction of organic insulators, plastic/resin/wax insulators, electrical components, etc., can solve problems such as high molecular weight of SG3 resin powder, poor physical properties of products, and influence of sheathing materials , to achieve the effect of broadening molecular weight distribution, good surface and improving processing performance

Active Publication Date: 2021-05-14
中广核拓普(四川)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, SG3 resin powder is usually used as raw material for 90°C PVC sheathing materials. Due to the high molecular weight of SG3 resin powder, it is difficult to plasticize completely during processing, and it is easy to affect the appearance of the final product.
At the same time, when the 90°C PVC sheath material particles prepared by SG3 are extruded, a higher extrusion temperature is required, which not only causes a lot of energy waste, but also poses a problem to the stabilizer required for the production of PVC. Higher requirements require stabilizers with higher temperature resistance grades and more additions
In the prior art, in order to improve the processing performance of polyvinyl chloride, materials with relatively low molecular weight are selected and used as raw materials, but the physical properties of the products prepared in this way are also deteriorated, and the processed sheath material products have a more serious impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The invention provides a kind of preparation method of low molecular weight polyvinyl chloride, comprises the following steps:

[0021] S1. Mix polyvinyl chloride resin powder and tetrahydrofuran, stir and heat to 58-62° C. to form a mixed liquid; take aluminum powder and carbon tetrachloride and mix and stir to form a mixed liquid B.

[0022] S2. Add B mixed solution into A mixed solution, the mass ratio of polyvinyl chloride resin powder and aluminum powder in the mixed solution is 38-42:1, keep stirring at a temperature of 58-62°C for 58-62 minutes, then filter, After the filtrate is collected, the solvent is removed, and low molecular weight polyvinyl chloride is obtained after drying.

[0023] The polyvinyl chloride resin powder used in the process of preparing low-molecular-weight polyvinyl chloride in the present invention is polyvinyl chloride resin powder prepared by calcium carbide method, and its molecular weight is in the range of 40,000 to 110,000, and the ...

Embodiment 1

[0029] This embodiment provides a preparation method of low molecular weight polyvinyl chloride and the obtained polyvinyl chloride. The preparation method comprises the following steps:

[0030] S1. Weigh 38kg of polyvinyl chloride resin powder and 95kg of tetrahydrofuran and mix, stir and heat to 62°C to form A mixed solution; take 1kg of aluminum powder and 18kg of carbon tetrachloride and mix and stir to form B mixed solution.

[0031] S2. Add B mixed solution to A mixed solution, and keep stirring at 61±1°C for 58 minutes, then filter, collect the filtrate, and use a rotary evaporator to evaporate and remove the solvent in the filtrate. The temperature of the water bath during the rotary evaporation process is 31 ±1°C, and then dried at 85°C for 1.8h to obtain low-molecular-weight polyvinyl chloride after drying. The number-average molecular weight of the low-molecular-weight polyvinyl chloride prepared in this example was 3.16×10 3 , the molecular weight distribution is ...

Embodiment 2

[0033] The difference between this example and Example 1 mainly lies in: in S1 of this example, the weighed polyvinyl chloride resin powder is 42kg, and the weighed tetrahydrofuran is 105kg, and the two are mixed and stirred and heated to 58°C to form A Mixture. The weighed aluminum powder is 1 kg, and the weighed carbon tetrachloride is 22 parts, and they are mixed to form a B mixed solution. In S2, mix A mixed liquid and B mixed liquid, keep stirring at 59±1°C for 62 minutes, filter, spin-evaporate the filtrate at 29±1°C water bath temperature, then dry at 75°C for 2.2h, and dry After obtaining low molecular weight polyvinyl chloride, the number average molecular weight of the low molecular weight polyvinyl chloride prepared by the present embodiment is 3.67 * 10 3 , the molecular weight distribution is 6.4.

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Abstract

The invention discloses low-molecular-weight polyvinyl chloride and a preparation method thereof, a sheath material and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method of the low-molecular-weight polyvinyl chloride comprises the steps: taking polyvinyl chloride resin and tetrahydrofuran, mixing to form a mixed solution A, taking aluminum powder and carbon tetrachloride and mixing to form a mixed solution B; and mixing and reacting the mixed solution A and the mixed solution B to obtain the low-molecular-weight polyvinyl chloride. The prepared low-molecular-weight polyvinyl chloride can participate in preparation of the 90-DEG C polyvinyl chloride sheath material, the molecular weight distribution of SG3 type polyvinyl chloride resin is widened, the processing performance of SG3 type polyvinyl chloride is improved, and the energy consumption of 90-DEG C polyvinyl chloride sheath preparation is saved.

Description

technical field [0001] The invention relates to a low-molecular-weight polyvinyl chloride, a preparation method, a sheath material and a preparation method, and belongs to the technical field of polymer materials. Background technique [0002] Polyvinyl chloride is a polymer obtained by the polymerization of vinyl chloride. The molecular weight of polyvinyl chloride produced in general industry is in the range of 50,000-110,000. It was once the world's largest general-purpose plastic. It is used in building materials, industrial products, and daily necessities. , floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers, etc. are widely used. According to relevant national standards, there are usually two kinds of polyvinyl chloride plastics used in wires and cables: 70°C polyvinyl chloride and 90°C polyvinyl chloride. [0003] At present, SG3 type resin powder is usually used as raw mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/50C08F114/06C08L27/06C08L23/06C08K13/02C08K5/12C08K3/26C08K3/22C08K3/38H01B3/44
CPCC08F8/50C08L27/06H01B3/443C08L2205/025C08L2205/03C08K2003/265C08K2003/387C08L2203/202C08F114/06C08L23/06C08K13/02C08K5/12C08K3/26C08K3/2279C08K3/38Y02A30/14
Inventor 陈雄沈斌
Owner 中广核拓普(四川)新材料有限公司
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