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Prepn. of PVF

A technology of polyvinyl fluoride and vinyl fluoride, which is applied in the field of preparation of polyvinyl fluoride, can solve the problems of difficulty in obtaining polyvinyl fluoride resin and low polymerization activity of vinyl fluoride, and achieve improved catalyst and equipment use efficiency and good film-forming performance , Increase the effect of melting temperature and heat of fusion

Active Publication Date: 2006-09-20
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymerization activity of vinyl fluoride is low, and it is generally difficult to obtain polyvinyl fluoride resins with excellent properties.

Method used

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  • Prepn. of PVF

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1) Add 6,000 parts of distilled water into a 10-liter polymerization reactor, stir and heat to 30°C, add 1,000 parts of distilled water, 1 part of azobisisobutylamidine hydrochloride and 25 parts of potassium chloride into the batching kettle, and stir After uniformity, add to the polymerization reactor, raise the temperature of the polymerization reactor to 100°C quickly, and use a metering pump to input vinyl fluoride monomer, keep the pressure in the polymerization reactor between 25.0 and 28.0MPa, react for 2.5 hours to cool down, and recover the unreacted monomer body, discharged to obtain white foam powder, filtered, washed and dried to obtain 985 parts of white powder. The product was dissolved in N,N-dimethylformamide at 110°C, and the measured intrinsic viscosity of the polymer was 1.51dL / g.

Embodiment 2

[0014] Example 2) Add 6,000 parts of distilled water to a 10-liter polymerization reactor, stir and heat to 30°C, add 1,000 parts of distilled water, 1 part of azobisisobutylamidine hydrochloride and 25 parts of potassium hydroxide to the batching kettle, and stir After uniformity, add to the polymerization reactor, raise the temperature of the polymerization reactor to 100°C quickly, and use a metering pump to input vinyl fluoride monomer, keep the pressure in the polymerization reactor between 25.0 and 28.0MPa, react for 2.5 hours to cool down, and recover the unreacted monomer body, discharged to obtain white fine spherical particles, filtered, washed and dried to obtain 1320 parts of white powder. The product was dissolved in N,N-dimethylformamide at 110°C, and the measured intrinsic viscosity of the polymer was 1.35 dL / g.

Embodiment 3

[0015] Example 3) Add 6,000 parts of distilled water into a 10-liter polymerization reactor, stir and heat to 30°C, add 1,000 parts of distilled water, 1 part of azobisisobutylamidine hydrochloride and 25 parts of hydrochloric acid into the batching kettle, and stir evenly Add the polymerization reactor, raise the temperature of the polymerization reactor to 100°C quickly, and use a metering pump to input vinyl fluoride monomer, keep the pressure in the polymerization reactor between 25.0 and 28.0MPa, react for 2.5 hours to cool down, and recover the unreacted monomer. Discharge to obtain white foam powder, filter, wash and dry to obtain 311 parts of white powder. The product was dissolved in N,N-dimethylformamide at 110°C, and the measured intrinsic viscosity of the polymer was 1.82dL / g.

[0016] Polyvinyl fluoride was melted and extruded by latent solvent N,N-dimethylformamide to form a biaxially stretched film and then tested according to GB530-88, GB13022-91, GB / T2410-1980...

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Abstract

This invention discloses a method to prepare polyvinyl fluoride in which vinyl fluoride is adopted as monomers for polymerization. It has the characteristics that polymerization takes place with the existence of soluble radical initiators and auxiliary reagents. The auxiliary reagents in this invention can be: A) neutral inorganic salts; B) alkali or alkali compounds; C) acid or acidic compounds. This invention has the advantages that compared to previous literature, a) polymerization time can be reduced and efficiency of catalyst and facility can be promoted without obvious change in product properties such as intrinsic viscosity, melting point and melting heat by addition of auxiliary reagent A); b) melting point and melting heat of the product can be raised by addition of auxiliary reagent B); c) melting point and melting heat of the product can be lowered by addition of auxiliary reagent C). The polyvinyl fluoride membrane by melting tape-casting extrusion with potential solvent such as N, N-dimethylformamide and biaxial orientation of vinyl fluoride has wonderful comprehensive properties.

Description

technical field [0001] The invention relates to a preparation method of polyvinyl fluoride. Background technique [0002] Fluorine resin has excellent high and low temperature resistance, good resistance to chemical solvents, acid and alkali corrosion, atmospheric aging resistance and stress cracking resistance; it has excellent electrical insulation, self-lubricating, non-stick, non-flammable and self-sustaining It is extinguishing, does not absorb water, and has the lowest coefficient of friction among all plastics. It is odorless, tasteless, and non-toxic. It has been widely used in chemical, electrical, electronic, and mechanical industries. It is an indispensable special engineering plastic in industry. Polyvinyl fluoride is the simplest representative of the fluoropolymer congeners, containing the fewest number of fluorine atoms in its composition, and therefore has the lowest density and production cost compared to other fluoropolymers. But like other fluoropolymers,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/20C08F4/30C08F2/00
Inventor 张艳中蒋争光
Owner ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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