Synthesis method of hydroxylated polyvinyl chloride copolymer resin

A technology of polyvinyl chloride copolymer resin and synthesis method, which is applied in the field of emulsion copolymerization to introduce HEMA into PVC chains, which can solve the problem of low HEMA content (not exceeding 0.1%, difficult cost of monomer and resin separation and recovery, HEMA homopolymerization ratio Large and other problems, to achieve the effect of large particle size range of latex, less pollution, and low energy consumption

Active Publication Date: 2015-03-25
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all face the difficulty of monomer and resin separation and recovery and cost problems
[0006] At present, there are also some public reports about the copolymerization of hydroxyethyl methacrylate (HEMA) and PVC. For example, US Patent No. 2686172 prepares hydroxyl-containing polyvinyl chloride resin by emulsion polymerization with hydroxyalkyl acrylate. The patent uses respectively Hydroxyethylhexyl acrylate and hydroxybutyl acrylate were used as comonomers to synthesize copolymer resins; Lee et al., Bao Yongzhong, etc. synthesized PVC grafted polyhydroxyethyl methacrylate by solution, aqueous phase suspension, and emulsion polymerization. Copolymers, but the above methods cannot solve the problems of low effective reaction conversion rate due to high HEMA reactivity rate, high HEMA homopolymerization ratio, and extremely low HEMA content in polymers (less than 0.1%).

Method used

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  • Synthesis method of hydroxylated polyvinyl chloride copolymer resin
  • Synthesis method of hydroxylated polyvinyl chloride copolymer resin
  • Synthesis method of hydroxylated polyvinyl chloride copolymer resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The composite emulsifier, initiator I, desalinated water, pH regulator, seed emulsion and vinyl chloride monomer are polymerized under anaerobic and closed conditions. The polymerization temperature is 50°C. The polymerization time of initiator II and HEMA monomer is 12 hours to prepare copolymer emulsion; then recover the unreacted vinyl chloride monomer to obtain colloidal particles with an average particle size greater than 1.0 μm. After spray drying, vinyl chloride / hydroxyethyl methacrylate copolymer paste resin is obtained.

[0031] The parts by weight of each component are as follows:

[0032]

[0033]

[0034] The seed emulsion particle diameter is 120nm, and the weight solid content is 42%;

[0035] The composite emulsifier is a mixture of sodium dodecylbenzenesulfonate and myristyl alcohol, and the weight ratio is 2:1;

[0036] The initiator I is ammonium persulfate, the initiator II is tert-butyl hydroperoxide, and the weight ratio of the initiator I t...

Embodiment 2

[0040] The composite emulsifier, initiator I, desalinated water, pH regulator, seed emulsion and vinyl chloride monomer are polymerized under anaerobic and closed conditions. The polymerization temperature is 52°C. Initiator II and HEMA monomer are polymerized for 10 hours to obtain a copolymer emulsion; then unreacted vinyl chloride monomer is recovered to obtain colloidal particles with an average particle size greater than 1.5 μm. After spray drying, vinyl chloride / hydroxyethyl methacrylate copolymer paste resin is obtained.

[0041] The parts by weight of each component are as follows:

[0042]

[0043] The particle size of the seed emulsion is 300nm, and the weight solid content is 32%; the compound emulsifier is a mixture of sodium dodecylsulfonate and cetyl alcohol, and the weight ratio is 1.8:1;

[0044] The initiator I is potassium persulfate, the initiator II is diethylhexyl peroxydicarbonate, and the weight ratio of the initiator I to the initiator II is 4:1;

...

Embodiment 3

[0048] The composite emulsifier, initiator I, desalinated water, pH regulator, seed emulsion and vinyl chloride monomer are polymerized under anaerobic and closed conditions. The polymerization temperature is 55°C. Initiator II and HEMA monomer, the polymerization time is 9h, and the copolymer emulsion is prepared; then the unreacted vinyl chloride monomer is recovered, and the colloidal particles with an average particle size greater than 1.6 μm can be obtained. After spray drying, vinyl chloride / hydroxyethyl methacrylate copolymer paste resin is obtained.

[0049] The parts by weight of each component are as follows:

[0050]

[0051] The particle size of the seed emulsion is 210nm, and the weight solid content is 35%; the composite emulsifier is a mixture of nonyl aryl polyether alcohol and octadecanoic acid, and the weight ratio is 1:1;

[0052] The initiator I is a mixture of sodium bisulfite and copper sulfate with a mass ratio of 1:0.1, and the initiator II is dieth...

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Abstract

The invention discloses a synthesis method of hydroxylated polyvinyl chloride copolymer resin. The synthesis method comprises the following steps of: adding hydroxyethyl methacrylate (HEMA) and an initiator II in a mixture of a composite emulsifying agent, an initiator I, water, a pH regulation agent, seed emulsion and a vinyl chloride monomer in a fluid mode, conducting polymerization reaction, and conducting spray drying on prepared emulsion to obtain the hydroxylated polyvinyl chloride copolymer resin, wherein the composite emulsifying agent is composed of an emulsifying agent I and an emulsifying agent II; the emulsifying agent I is sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium lauryl sulfate, nonyl aryl polyether alcohol, ammonium laurate, polyoxyethylene nonyl phenyl ether or polyoxyethylene octylphenol ether; and the emulsifying agent II is tetradecyl alcohol, setanol, stearyl alcohol, dodecanoic acid, tetradecanoic acid, tetradecanoic acid, octadecanoic acid, hexadecane or octodecane. The synthesis method is simple in equipment, solves the problems of low reaction conversion rate, large HEMA homopolymerization rate, low HEMA content in polymer and the like, and is low in cost, saving in energy consumption and less in pollution discharge.

Description

technical field [0001] The invention relates to a method for synthesizing hydroxyl-containing polyvinyl chloride paste resin, in particular to a method for introducing HEMA into PVC chains through emulsion copolymerization. Background technique [0002] Polyvinyl chloride (PVC) is one of the commonly used medical polymer materials, which can be used to make blood storage bags, catheters, artificial urethras, etc. PVC has poor hydrophilicity, which affects its biocompatibility. Graft copolymerization of monomers with hydrophilic functional groups and PVC is an important method to improve the hydrophilicity of PVC. On the other hand, due to the introduction of hydroxyl groups into the PVC chain, this functional group can be used for crosslinking and functionalization. Therefore, the PVC resin after the introduction of hydroxyl groups has obvious advantages, such as significantly improving the compatibility with other film-forming substances, thereby improving the coating adh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/06C08F220/28C08F2/30C08F2/28C08F2/26
Inventor 董炜星袁茂全张月芳缪晖黄业勤
Owner SHANGHAI CHLOR ALKALI CHEM
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