Method for synthesizing CPVC resin by gas-solid phase method

A chlorinated polyvinyl chloride, gas-solid phase technology, applied in the field of gas-solid phase synthesis of chlorinated polyvinyl chloride resin, can solve the problems of high cost, unsuitable for large-scale production, and many wastes

Inactive Publication Date: 2012-11-21
苏州宝津塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a long process, produces more "three wastes" and relatively high cost
Yang Jinping used the gas-solid phase stirring chlorination method to produce CPVC. This method has a simple process and low pollutant emissions, but the heat transfer effect is poor, and it is not suitable for large-scale production.

Method used

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  • Method for synthesizing CPVC resin by gas-solid phase method
  • Method for synthesizing CPVC resin by gas-solid phase method
  • Method for synthesizing CPVC resin by gas-solid phase method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] This embodiment illustrates the impact of reaction time on PVC chlorination, figure 1 For the relationship between reaction time and ω(Cl), the ω(Cl) of CPVC increases with time, up to 68.14%. After more than 3 h, the trend of this change weakened, and the reaction gradually tended to balance. This is because PVC undergoes a free radical substitution reaction during chlorination, and the PVC molecular chain contains more -CH2- and -CHCl- in the initial stage of the reaction. Chlorination is faster. As the reaction proceeds, in the PVC molecular chain -CCl 2 - increases gradually, while -CH2- and -CHCl- decrease gradually, and the reaction becomes more difficult for chlorine substitution to a certain extent, and the reaction tends to be gentle at this time. Therefore, 3 h is selected as the optimal reaction time for PVC chlorine chlorination, and the ω (Cl) in the product is 67.78% at this time.

Embodiment 2

[0022] This embodiment illustrates the impact of temperature of reaction on PVC chlorination, figure 2 is the relationship between the reaction temperature and ω(Cl), by figure 2 It can be seen that the ω(Cl) of CPVC increases with the increase of the reaction temperature, but this trend weakens after reaching 112°C, and the product ω(Cl) can reach 68.65% at 125°C. This is because the reaction is an exothermic reaction, the higher the temperature, the greater the reaction resistance and the reduced reaction rate. Experiments have found that if the temperature is too high, the material will stick and turn yellow, and the reaction cannot be carried out normally. This is because CPVC with a certain ω (Cl) will degrade and de-HCl at a higher temperature. Therefore, the optimal temperature for PVC chlorination is 112°C.

Embodiment 3

[0024] This embodiment illustrates that the feed gas φ(Cl 2 ) on the impact of PVC chlorination, the chemical reaction between polymers depends on the collision probability of active groups on the polymer chain, the higher the collision probability, the easier the intermolecular reaction, and the greater the reaction rate, if φ(Cl 2 ) is too low, so that the effective collision probability of the chemical reaction is reduced. Depend on image 3 It can be seen that: φ(Cl 2 ) is less than 30%, change Cl 2 Flow has a significant effect on ω(Cl), but with φ(Cl 2 ) further increases, this effect weakens rapidly, when φ(Cl 2 ) exceeds 45%, it has little effect on the product ω(Cl). Therefore, the preferred φ(Cl 2 ) is 45%.

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Abstract

The invention provides a method for synthesizing CPVC resin by gas-solid phase method. According to the invention, in a fluidized bed reactor, the synthetic process of the CPVC resin initiated by ultraviolet lights is studied, and the reaction time, reaction temperature, and Phi (C12) in the raw material gas and the influence of the ultraviolet light intensity to a product Omega (C1) are investigated.

Description

technical field [0001] The invention relates to a synthesis method of chlorinated polyvinyl chloride resin, in particular to a method for synthesizing chlorinated polyvinyl chloride resin by a gas-solid phase method. Background technique [0002] Polyvinyl chloride is one of the five general-purpose resins, and its output is second only to polyethylene. With the extensive promotion and use of chemical building materials, the proportion of PVC hard products is increasing, especially the demand for pipes, plates and profiles is growing rapidly, so there are higher requirements for the performance of PVC. Polyvinyl chloride resin is relatively brittle, and the traditional toughening modification technology usually adds rubber elastomers to the resin, but at the cost of reducing the precious rigidity, heat resistance, and dimensional stability of the material. [0003] Chlorinated polyvinyl chloride (CPVC) is the product of further chlorinated modification of polyvinyl chloride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/06C08F8/22
Inventor 徐培君
Owner 苏州宝津塑业有限公司
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