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Novel plasticizer-free soft PVC (polyvinyl chloride) and preparation method thereof

A plasticizer and soft technology, which is applied to the new type of soft PVC without plasticizer and its preparation field, can solve the problems of changes in physical and chemical properties, affecting product performance and service life, and plasticizer overflow.

Active Publication Date: 2022-04-26
YUNNAN ZHENGBANG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Plasticizers are added during the batching process, and generally do not chemically react with the polymer, and when the product is exposed to heat radiation or comes into contact with an acid-base solution with strong extraction ability When it is extracted or migrated by itself, the physical and chemical properties of the product itself will also change accordingly, affecting the performance and service life of the product
At the same time, due to the natural overflow of plasticizers in PVC, especially when heated, a large amount of plasticizers will leak out.

Method used

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  • Novel plasticizer-free soft PVC (polyvinyl chloride) and preparation method thereof
  • Novel plasticizer-free soft PVC (polyvinyl chloride) and preparation method thereof
  • Novel plasticizer-free soft PVC (polyvinyl chloride) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A novel soft PVC without plasticizer is prepared by the following method:

[0036] S1. Prepare the vinyl chloride monomer Amol, prepare the first comonomer B mol; the structural formula of the first comonomer is:

[0037] S2. Add the first copolymer monomer into the deionized water, add the dispersant and fully stir to disperse, then add the initiator, adjust the system temperature to 40°C±2°C, and keep it for 4min to obtain the copolymer suspension.

[0038] S3. After replacing the air in the reactor with an inert gas, inject vinyl chloride gas into the copolymer suspension, adjust the temperature of the system to 60° C., and maintain it for 2.5 hours to obtain a reaction product.

[0039] S4. The reaction product is subjected to solid-liquid separation, washing and drying to obtain the soft PVC.

[0040] Wherein: the number of moles B of the first comonomer satisfies B=A / K 1 , K 1 Take 14. R 1 for N atoms, R 2 and R 3 same; the R 2 , R 3 Both are C 12 of a...

Embodiment 2

[0044] A novel soft PVC without plasticizer is prepared by the following method:

[0045] S1. Prepare the vinyl chloride monomer Amol, prepare the first comonomer B mol; the structural formula of the first comonomer is:

[0046] S2. Add the first copolymer monomer into the deionized water, add the dispersant and fully stir to disperse, then add the initiator, adjust the system temperature to 40°C±2°C, and keep it for 5min to obtain the copolymer suspension.

[0047] S3. After replacing the air in the reactor with an inert gas, inject vinyl chloride gas into the copolymer suspension, adjust the temperature of the system to 70° C., and maintain it for 2 hours to obtain a reaction product.

[0048] S4. The reaction product is subjected to solid-liquid separation, washing and drying to obtain the soft PVC.

[0049] Wherein: the number of moles B of the first comonomer satisfies B=A / K 1 , K 1 Take 15. R 1 is the S atom, R 2 and R 3 different; the R 2 for C 12 alkanes, R 3...

Embodiment 3

[0053] A novel soft PVC without plasticizer is prepared by the following method:

[0054] S1. Prepare the vinyl chloride monomer Amol, prepare the first comonomer B mol; the structural formula of the first comonomer is:

[0055] S2. Add the first copolymer monomer into the deionized water, add the dispersant and fully stir to disperse, then add the initiator, adjust the temperature of the system to 40°C±2°C, and keep it for 3min to obtain a copolymer suspension.

[0056] S3. After replacing the air in the reactor with an inert gas, inject vinyl chloride gas into the copolymer suspension, adjust the temperature of the system to 50° C., and maintain it for 3 hours to obtain a reaction product.

[0057] S4. The reaction product is subjected to solid-liquid separation, washing and drying to obtain the soft PVC.

[0058] Wherein: the number of moles B of the first comonomer satisfies B=A / K 1 , K 1 Take 13. R 1 is the P atom, R 2 and R 3 same; the R 2 , R 3 Both are C 3 ...

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Abstract

The invention provides novel plasticizer-free soft PVC (polyvinyl chloride) which is obtained by copolymerizing a first comonomer and VCM (vinyl chloride monomer), the first comonomer is ethylene containing a heteroatom aromatic ring group, and the heteroatom aromatic ring group is provided with two alkyl molecular chains. The heteroatom is selected from one of P, N and S atoms. According to the invention, the copolymerization modified PVC material is prepared by introducing the comonomer, and the mechanical property of the PVC material is still close to that of soft PVC modified by a conventional plasticizer even if the PVC material is not added with the plasticizer. And the preparation method of the modified PVC is close to the preparation method of the existing soft PVC, and large-scale adjustment of a production line is not needed during industrial production.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a novel soft PVC without plasticizer and a preparation method thereof. Background technique [0002] Polyvinyl chloride, referred to as PVC in English, is a polymer formed by the polymerization of vinyl chloride monomer (VCM) under the action of an initiator or light and heat according to the mechanism of free radical polymerization. PVC is still one of the most common general-purpose plastics in the world, with a wide range of applications. It is widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers, etc. [0003] According to different uses, PVC plastics are often divided into: non-plasticized PVC, the plasticizer content is 0; rigid PVC, the plasticizer content is less than 10%; semi-rigid PVC, t...

Claims

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Application Information

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IPC IPC(8): C08F214/06C08F226/06C08F228/06C08F230/02C08F226/02C08F228/02
CPCC08F214/06C08F226/06C08F228/06C08F230/02C08F226/02C08F228/02
Inventor 熊磊黄洪徐发良陈旭王应冲杨林方
Owner YUNNAN ZHENGBANG SCI & TECH
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