Production method of special resin for gas-solid-phase-process chlorinated polyvinyl chloride and with medium-and-high polymerization degrees

Abstract

The invention relates to a production method of special resin for gas-solid-phase-process chlorinated polyvinyl chloride and with medium-and-high polymerization degrees. The production method sequentially comprises the following steps: preparation of an auxiliary agent, feeding into a polymerization kettle, material activation, variable-temperature polymerization reaction control and discharging, steam stripping and drying of PVC slurry. By adopting a variable-temperature polymerization mode, PVC granulation is completed at a proper temperature, the use amount of a dispersing agent is reduced, the grafting rate of the dispersing agent polyvinyl alcohol and vinyl chloride is reduced, a coating coverage rate is reduced, a polymerization chemical reaction rate is controlled by adjusting the temperature, and the method is simple, convenient, easy to implement, high in operability and good in reproducibility. The method can be widely applied to the production process of the special resin for gas-solid-phase-process chlorination of polyvinyl chloride.

Description

technical field

[0001] The invention relates to the technical field of chemical industry, in particular to a production method of a gas-solid phase chlorinated polyvinyl chloride special resin with a medium and high degree of polymerization. Background technique

[0002] Chlorinated polyvinyl chloride (CPVC) is obtained by further chlorination of polyvinyl chloride (PVC), and is a new type of polymer elastomer material between rubber and plastic. After the PVC resin is chlorinated, the irregularity of the molecular bond increases, the polarity increases, the solubility of the resin increases, and the chemical stability improves, thereby improving the material's heat resistance, acid, alkali, salt, oxidant, etc. Corrosion. Compared with PVC, CPVC has greatly improved its heat resistance, corrosion resistance, flame retardant and self-extinguishing properties, and mechanical properties. It is widely used in building materials, electrical, chemical, metallurgy, medicine, coatin...

Examples

Embodiment 1

[0031] Embodiment 1: a kind of production method of medium and high degree of polymerization gas-solid phase chlorinated polyvinyl chloride special resin, comprises the following steps successively:

[0032] (1) Preparation of auxiliary agents: including the preparation of dispersant A, dispersant B, surfactant, initiator and neutralizer;

[0033] (2) Polymerization kettle feeding: Spray the inner wall of the polymerization kettle with anti-sticking kettle agent, drain the residual liquid in the coating kettle, start the polymerization kettle to stir, and add cold ion-free water, hot ion-free water, and neutralizer to the polymerization kettle in turn , dispersant A, surfactant, dispersant B, initiator, vinyl chloride monomer, and mix the materials evenly;

[0034] (3) Material activation: use the jacket of the polymerization kettle and the hot circulating water system to continuously raise the temperature of the materials in the polymerization kettle to activate the materials...

Embodiment 2

[0037] Embodiment 2: a kind of production method of medium and high degree of polymerization gas-solid phase chlorinated polyvinyl chloride special resin, comprises the following steps successively:

[0038] Auxiliary preparation: Dissolve polyvinyl alcohol with a degree of alcoholysis of 65% into a 5% solution for later use; prepare hydroxypropyl methylcellulose into a 5% solution for later use; with an alcoholysis degree of 40%, mainly block-distributed Polyvinyl alcohol solution is standby; Initiator comprises initiator A: cumyl peroxyneodecanoate, initiator B: tert-butyl peroxyneodecanoate; Described neutralizer is prepared as carbonate and is mixed with 5% The solution is ready for use;

[0039] Polymerization kettle feeding: After the reaction, rinse the polymerization kettle with high-pressure water, and spray the inner wall of the polymerization kettle with an anti-adhesion machine after the residual liquid is drained. Add cold deionized water and hot deionized water,...

Embodiment 3

[0043] Embodiment 3: a kind of production method of medium and high degree of polymerization gas-solid phase chlorinated polyvinyl chloride special resin, comprises the following steps successively:

[0044] Auxiliary preparation: dissolving polyvinyl alcohol with a degree of alcoholysis of 75% into a 3% solution for later use; preparing hydroxypropyl methylcellulose into a 5% solution for later use; The polyvinyl alcohol solution of block distribution is standby; Initiator cumyl peroxyneodecanoate, tert-butyl peroxyneodecanoate; Neutralizer carbonate is prepared into 3% solution for standby;

[0045] Polymerization kettle feeding: After the reaction, rinse the polymerization kettle with high-pressure water, and spray the inner wall of the polymerization kettle with an anti-adhesion machine after the residual liquid is drained. Add cold deionized water and hot deionized water, neutralizer, polyvinyl alcohol solution with alcoholysis degree of 75%, polyvinyl alcohol solution wi...

technical field

[0001] The invention relates to the technical field of chemical industry, in particular to a production method of a gas-solid phase chlorinated polyvinyl chloride special resin with a medium and high degree of polymerization. Background technique

[0002] Chlorinated polyvinyl chloride (CPVC) is obtained by further chlorination of polyvinyl chloride (PVC), and is a new type of polymer elastomer material between rubber and plastic. After the PVC resin is chlorinated, the irregularity of the molecular bond increases, the polarity increases, the solubility of the resin increases, and the chemical stability improves, thereby improving the material's heat resistance, acid, alkali, salt, oxidant, etc. Corrosion. Compared with PVC, CPVC has greatly improved its heat resistance, corrosion resistance, flame retardant and self-extinguishing properties, and mechanical properties. It is widely used in building materials, electrical, chemical, metallurgy, medicine, coatin...

Examples

Embodiment 1

[0031] Embodiment 1: a kind of production method of medium and high degree of polymerization gas-solid phase chlorinated polyvinyl chloride special resin, comprises the following steps successively:

[0032] (1) Preparation of auxiliary agents: including the preparation of dispersant A, dispersant B, surfactant, initiator and neutralizer;

[0033] (2) Polymerization kettle feeding: Spray the inner wall of the polymerization kettle with anti-sticking kettle agent, drain the residual liquid in the coating kettle, start the polymerization kettle to stir, and add cold ion-free water, hot ion-free water, and neutralizer to the polymerization kettle in turn , dispersant A, surfactant, dispersant B, initiator, vinyl chloride monomer, and mix the materials evenly;

[0034] (3) Material activation: use the jacket of the polymerization kettle and the hot circulating water system to continuously raise the temperature of the materials in the polymerization kettle to activate the materials...

Embodiment 2

[0037] Embodiment 2: a kind of production method of medium and high degree of polymerization gas-solid phase chlorinated polyvinyl chloride special resin, comprises the following steps successively:

[0038] Auxiliary preparation: Dissolve polyvinyl alcohol with a degree of alcoholysis of 65% into a 5% solution for later use; prepare hydroxypropyl methylcellulose into a 5% solution for later use; with an alcoholysis degree of 40%, mainly block-distributed Polyvinyl alcohol solution is standby; Initiator comprises initiator A: cumyl peroxyneodecanoate, initiator B: tert-butyl peroxyneodecanoate; Described neutralizer is prepared as carbonate and is mixed with 5% The solution is ready for use;

[0039] Polymerization kettle feeding: After the reaction, rinse the polymerization kettle with high-pressure water, and spray the inner wall of the polymerization kettle with an anti-adhesion machine after the residual liquid is drained. Add cold deionized water and hot deionized water,...

Embodiment 3

[0043] Embodiment 3: a kind of production method of medium and high degree of polymerization gas-solid phase chlorinated polyvinyl chloride special resin, comprises the following steps successively:

[0044] Auxiliary preparation: dissolving polyvinyl alcohol with a degree of alcoholysis of 75% into a 3% solution for later use; preparing hydroxypropyl methylcellulose into a 5% solution for later use; The polyvinyl alcohol solution of block distribution is standby; Initiator cumyl peroxyneodecanoate, tert-butyl peroxyneodecanoate; Neutralizer carbonate is prepared into 3% solution for standby;

[0045] Polymerization kettle feeding: After the reaction, rinse the polymerization kettle with high-pressure water, and spray the inner wall of the polymerization kettle with an anti-adhesion machine after the residual liquid is drained. Add cold deionized water and hot deionized water, neutralizer, polyvinyl alcohol solution with alcoholysis degree of 75%, polyvinyl alcohol solution wi...