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PVC resin with ultra-low degree of polymerization and manufacturing method thereof

A technology of PVC resin and degree of polymerization, which is applied in the field of ultra-low polymerization degree of PVC resin and its production, can solve the problems of limited dispersant for polymerization, serious sticking to the kettle, difficulty in the production process of polyvinyl chloride, etc., and achieves melting and gelation. Low temperature, short plasticizing time, improved particle morphology and molecular weight distribution

Active Publication Date: 2012-07-18
SICHUAN JINLU GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the reaction temperature, it will also cause serious sticking, which will bring difficulties to the production process of polyvinyl chloride.
In addition, as the reaction temperature increases, the gelation temperature and cloud point of the dispersant for polymerization are also required to increase accordingly, which causes great restrictions on the dispersant for polymerization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A PVC resin with an ultra-low degree of polymerization, comprising the following components in parts by weight:

[0042] VCM vinyl chloride monomer 100 parts,

[0043] 150 parts of pure water,

[0044] Dispersant 0.4 part,

[0045] 0.02 parts of buffering agent,

[0046] 0.04 part of initiator,

[0047] Chain transfer agent 0.01 part,

[0048] Heat stabilizer 0.3 part,

[0049]0.3 parts of terminator.

[0050] Among them, the dispersant includes polyvinyl alcohol GH20 of Japan Synthetic Chemical Company, hydroxypropyl methylcellulose E50 of American Dow Chemical Company and polyvinyl alcohol LL-02 of Japan Synthetic Chemical Company, polyvinyl alcohol GH20: hydroxypropyl The ratio of methylcellulose E50:polyvinyl alcohol LL-02 is 1:1.2:0.8.

[0051] Initiators include cumyl peroxyneodecanoate and di-3,5,5 trimethylhexyl peroxide, cumyl peroxyneodecanoate: di-3,5,5 trimethyl peroxide Hexyl ester is 1:1.

[0052] In addition, ammonium bicarbonate is selected as t...

Embodiment 2

[0059] A PVC resin with an ultra-low degree of polymerization, comprising the following components in parts by weight:

[0060] VCM vinyl chloride monomer 100 parts,

[0061] 200 parts of pure water,

[0062] Dispersant 0.7 parts,

[0063] 0.04 parts of buffering agent,

[0064] 0.09 part of initiator,

[0065] 0.032 part of chain transfer agent,

[0066] Heat stabilizer 0.6 parts,

[0067] 0.6 parts of terminator.

[0068] In the present invention, the dispersant includes polyvinyl alcohol KH20 of Japan Synthetic Chemical Company, hydroxypropyl methylcellulose F50 of Dow Chemical Company of the United States and polyvinyl alcohol LW-200 of Japan Synthetic Chemical Company, polyvinyl alcohol KH20: hydroxyl The ratio of propyl methylcellulose F50:polyvinyl alcohol LW-200 is 1:2.0:1.5.

[0069] The initiator includes tert-butyl peroxyneodecanoate and peroxydilaurate, and the ratio of tert-butyl peroxyneodecanoate: peroxydilaurate is 1:2.

[0070] Additionally, the buffer...

Embodiment 3

[0076] A PVC resin with an ultra-low degree of polymerization, comprising the following components in parts by weight:

[0077] VCM vinyl chloride monomer 100 parts,

[0078] 170 parts of pure water,

[0079] Dispersant 0.55 part,

[0080] 0.03 parts of buffering agent,

[0081] 0.07 part of initiator,

[0082] 0.02 part of chain transfer agent,

[0083] Heat stabilizer 0.45 parts,

[0084] 0.5 parts of terminator.

[0085] In the present invention, the dispersant includes polyvinyl alcohol KH17 of Japan Synthetic Chemical Company, hydroxypropyl methylcellulose E50 of Dow Chemical Company of the United States and polyvinyl alcohol LW-200 of Japan Synthetic Chemical Company, polyvinyl alcohol KH17: hydroxyl The ratio of propyl methylcellulose E50:polyvinyl alcohol LW-200 is 1:1.7:1.1.

[0086] The initiator includes cumyl peroxyneodecanoate and dilaurate peroxide, and the ratio of cumyl oxide neodecanoate:dilaurate peroxide is 1:1.5.

[0087] Additionally, the buffer is...

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PUM

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Abstract

The invention discloses a PVC resin with ultra-low degree of polymerization and a manufacturing method thereof. In the invention, a polymerization method is adopted to carry out polymerization reaction, the reaction temperature is 60-64 DEG C, and the reaction pressure is less than 1.0 MPa; a first chain transfer agent is added when the polymerization reaction is carried out for 0-30min, and then0.005-0.012% of vinyl chloride monomer (VCM) is added; a second chain transfer agent is added when the polymerization reaction is carried out for 60-90min, and then 0.005-0.02% of monomer is added toobtain the PVC resin with ultra-low degree of polymerization. The PVC resin manufactured by the invention has the advantages of the average degree of polymerization below 500, high apparent density, low melting and gelatinization temperature, low melt viscosity, good transparency, short plasticization time and favorable processability and the like, and the phenomenon of accelerating products aging due to the transfer of plasticizer does not appear in machining process.

Description

technical field [0001] The invention relates to a PVC resin and a production method thereof, in particular to an ultra-low polymerization degree PVC resin and a production method thereof. Background technique [0002] As we all know, when there is no chain transfer agent, the polymerization temperature is the only factor that determines the molecular weight of polyvinyl chloride. The higher the polymerization temperature is, the lower the molecular weight of polyvinyl chloride resin is. A high reaction temperature is required, even reaching above 70°C. As the reaction temperature increases, it will have a great impact on the internal structure of polyvinyl chloride resin particles: the primary particles become larger, the degree of fusion deepens, the solubility of polyvinyl chloride resin in the monomer is improved, and it is easy to form compact particles. And glass beads, which will inevitably lead to the reduction of the internal porosity of the resin particles, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/06C08F2/38
Inventor 黄传华
Owner SICHUAN JINLU GRP
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