Chlorinated polyvinyl chloride resin acid-phase method production process
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A chlorinated polyvinyl chloride, production process technology, applied in the field of polymer material synthesis, can solve the problems of large waste water discharge, low production efficiency, unstable product quality, etc., to reduce waste acid discharge, improve efficiency, strengthen The effect of environmental protection
Inactive Publication Date: 2016-04-06
山东旭业新材料有限公司
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Problems solved by technology
However, the existing water-phase production process has disadvantages such as lo
Method used
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Embodiment 1
[0016] The ratio of raw materials is: 100kg of polyvinyl chloride powder, 500kg of 5% hydrochloric acid solution, 0.2kg of silicon dioxide, 0.1kg of ethylene oxide and propylene oxide copolymer, 0.3kg of di-tert-butyl peroxide, and 40kg of chlorine gas. The specific operation steps are:
[0017] (1) Add hydrochloric acid solution to the glass-lined reactor in sequence, add silicon dioxide, ethylene oxide and propylene oxide copolymer, and polyvinyl chloride powder, and then stir to emulsify and disperse for 1 hour.
[0018] (2) Raise the temperature to 80°C and add di-tert-butyl peroxide, then pass chlorine gas into the reaction solution for chlorination reaction, continuously raise the temperature to 110°C, control the reaction pressure at 0.4-0.45MPa, and keep the reaction time for about 6 hours.
[0019] (3) The reaction solution is filtered and deacidified through a crawler filter (or Hastelloy centrifuge), and the filter residue is subjected to conventional water washing,...
Embodiment 2
[0022] The ratio of raw materials is: 100kg of polyvinyl chloride powder, 500kg of 20% hydrochloric acid solution, 0.2kg of silicon dioxide, 0.1kg of ethylene oxide and propylene oxide copolymer, 0.3kg of di-tert-butyl peroxide, and 40kg of chlorine gas. The specific operation steps are:
[0023] (1) Add hydrochloric acid solution, silicon dioxide, ethylene oxide and propylene oxide copolymer, and polyvinyl chloride powder to the glass-lined reactor in sequence, and then stir to emulsify and disperse for 1 hour.
[0024] (2) Heat up to 80°C and add di-tert-butyl peroxide, then pass chlorine gas into the reaction solution for chlorination reaction, continue to heat up to 110°C to stop the reaction, control the reaction pressure 0.4-0.45MPa, and keep the reaction time for 6 hours about.
[0025] (3) The reaction solution is filtered and deacidified by a crawler filter (Hastelloy centrifuge), and the filter residue is subjected to conventional water washing, neutralization, dryi...
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Abstract
The invention discloses a chlorinated polyvinyl chloride resin acid-phase method production process. The working procedures of the production process comprises chlorination, deacidification by filtering, washing by water, neutralizing and drying, reactants of the chlorination procedure comprise the following components in parts by weight: 100 parts of polyvinyl chloride, 500 to 600 parts of hydrochloric acid solution with the mass concentration being 0.1 to 22 percent, 0.2 to 0.4 part of dispersing agent, 0.1 to 0.2 part of emulsifier and 0.1 to 0.3 part of initiator; the operating steps of the chlorination procedure are as follows: (1) adding the dispersing agent, the emulsifier and the polyvinyl chloride into the hydrochloric acid solution, and then stirring for emulsification and dispersion; (2) heating up to 70 to 80 DEG C, adding the initiator, then pumping a chlorine gas into reaction liquid for a chlorination reaction, wherein the reaction temperature is not over 110 DEG C, the pressure is controlled to be not higher than 0.45 MPa, and when the chlorine content reaches needing, the reaction is finished. According to the production process, the chlorination reaction is performed by replacing an aqueous medium with a hydrochloric acid medium with a certain concentration, so that the uniformity of the chlorination reaction is improved, and the chlorine content is stable; meanwhile, after the concentration of acid is increased, acid liquor is recycled, and an assistant in mother liquor is recycled, so that the discharge of waste acid is reduced, the discharge of organic matters is also reduced, the efficiency is improved, the cost is lowered and environment protection is strengthened.
Description
technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a chlorinated polyvinyl chloride resin acid phase production process. Background technique [0002] At present, the methods for producing chlorinated polyvinyl chloride resin in China are all water-phase methods. The solvent method has been eliminated due to high production costs. The product quality of the solid-phase method cannot meet the requirements and industrialization cannot be realized. Therefore, the water-phase method is the main production method. The aqueous phase suspension method is to use a certain amount of dispersant to disperse and suspend polyvinyl chloride in pure water, and pressurize chlorine gas under stirring for chlorination. When the required chlorine content is reached, filter and deacidify, wash with water, Neutralized and dried finished product. However, the existing water-phase production process has disadvantages such as low pro...
Claims
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