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

The technology of a PVC resin and a production method is applied to the PVC resin with an ultra-low degree of polymerization and the production field thereof, and can solve the problems such as the limitation of dispersant used for polymerization, serious sticking to the kettle, and difficulty in the production process of polyvinyl chloride, and achieve melting and gelation. Low temperature, short plasticizing time, improved particle morphology and molecular weight distribution

Active Publication Date: 2010-03-10
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 incr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

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

[0042] 100 parts of VCM vinyl chloride monomer,

[0043] 150 parts of pure water,

[0044] 0.4 part of dispersant,

[0045] Buffer 0.02 parts,

[0046] Initiator 0.04 part,

[0047] 0.01 part of chain transfer agent,

[0048] Heat stabilizer 0.3 parts,

[0049]Terminator 0.3 parts.

[0050] Among them, the dispersing agent includes polyvinyl alcohol GH20 of Japan Synthetic Chemical Company, hydroxypropyl methylcellulose E50 of Dow Chemical Company of the United States and polyvinyl alcohol LL-02 of Japan Synthetic Chemical Company, polyvinyl alcohol GH20: hydroxypropyl Methylcellulose E50:polyvinyl alcohol LL-02 was 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 was s...

Example Embodiment

[0058] Example 2

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

[0060] 100 parts of VCM vinyl chloride monomer,

[0061] 200 parts of pure water,

[0062] 0.7 part of dispersant,

[0063] Buffer 0.04 parts,

[0064] Initiator 0.09 part,

[0065] Chain transfer agent 0.032 parts,

[0066] Heat stabilizer 0.6 parts,

[0067] Terminator 0.6 parts.

[0068] In the present invention, the dispersing agent includes polyvinyl alcohol KH20 from Nippon Synthetic Chemical Company, hydroxypropyl methylcellulose F50 from Dow Chemical Company in the United States, and polyvinyl alcohol LW-200 from Nippon Synthetic Chemical Company. The ratio of propyl methylcellulose F50: polyvinyl alcohol LW-200 was 1:2.0:1.5.

[0069] The initiators included t-butyl peroxyneodecanoate and dilaurate peroxyneodecanoate in a 1:2 ratio of t-butyl peroxyneodecanoate:dilaurate peroxylate.

[0070] In addition, the buffer was sodium bi...

Example Embodiment

[0075] Example 3

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

[0077] 100 parts of VCM vinyl chloride monomer,

[0078] 170 parts of pure water,

[0079] 0.55 part of dispersant,

[0080] Buffer 0.03 parts,

[0081] Initiator 0.07 part,

[0082] 0.02 part of chain transfer agent,

[0083] Heat stabilizer 0.45 parts,

[0084] Terminator 0.5 parts.

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

[0086] The initiators included cumyl peroxyneodecanoate and dilaurate peroxyneodecanoate in a ratio of cumyloxyneodecanoate:dilaurate peroxylate of 1:1.5.

[0087] In addition, the buffer was ammonium bi...

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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 agingdue 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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IPC IPC(8): C08F114/06C08F2/38
Inventor 黄传华
Owner SICHUAN JINLU GRP
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