Preparation of chlorinated polyvinyl chloride resin for pipe fittings
A technology of chlorinated polyvinyl chloride and polyvinyl chloride resin, which is applied in the field of aqueous phase suspension chlorination method, can solve the problems of resin fluidity deterioration, increase, and influence, and achieve good processing fluidity and heat resistance stability Effect
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Embodiment 1
[0026] In a 100L enamel reaction kettle, add 10kg of PVC resin with a polymerization degree of 500 and 90kg of hydrochloric acid with a weight concentration of 20%, and use different types of initiators under the same operating conditions except for different initiator conditions. Initiator consumption is 0.1% (wt %) of PVC consumption, i.e. 10g lauroyl peroxide, 10g benzoyl peroxide, 33.3g weight concentration are 30% hydrogen peroxide, 10g tert-butyl peroxycarbonate, 10g weight Concentration is the composite initiator of 30% hydrogen peroxide and 7g lauroyl peroxide, after adding 166.7g30% silica sol solution, feed nitrogen for 30 minutes, while the jacket feeds steam to raise the temperature to 75°C, turn off nitrogen, and pass through After 5 minutes of chlorine gas with a flow rate of 15L / min, close the tail gas valve, and at the same time raise the temperature to 95°C, adjust the chlorine flow rate to 6L / min for 40 minutes; raise the temperature to 105°C, adjust the chlor...
Embodiment 2
[0031] In a 100L enamel reaction kettle, add 25kg of PVC resin with a degree of polymerization of 800 and 75kg of hydrochloric acid with a weight concentration of 10%, and use different types of initiators under the same operating conditions except for different initiator conditions. Initiator consumption is 0.5% (wt%) of PVC consumption, i.e. 125g lauroyl peroxide, 125g benzoyl peroxide, 416.7g weight concentration are 30% hydrogen peroxide, 125g tert-butyl peroxycarbonate, 60g peroxide The composite initiator of benzoyl oxide and 65g lauroyl peroxide, after adding 2500g of polyvinyl alcohol 10% solution with a molar alcoholysis degree of 78%, feed nitrogen for 30 minutes, while the jacket feeds steam and heats up to 75 ℃, turn off the nitrogen, let in chlorine gas with a flow rate of 15L / min for 5 minutes, then close the tail gas valve, and at the same time raise the temperature to 95°C, and maintain the chlorine flow rate for 40 minutes; raise the temperature to 105°C, adjus...
Embodiment 3
[0035]In a 100L enamel reaction kettle, add 35kg of PVC resin with a polymerization degree of 1000 and 65kg of deionized water. Except for different initiator conditions, under the same operating conditions, add different types of initiators. The amount of initiators is 1.0% (wt %) of PVC consumption, i.e. 350g lauroyl peroxide, 350g benzoyl peroxide, 1166.7g weight concentration is 30% hydrogen peroxide, 350g tert-butyl peroxycarbonate, 500g weight concentration is 30% Hydrogen peroxide and 200g of benzoyl peroxide compound initiator, after adding 1750g of 30% silica sol solution, nitrogen gas was passed in for 30 minutes, while steam was passed into the jacket to raise the temperature to 75°C, nitrogen gas was turned off, and the flow rate was 15L / After 10 minutes of chlorine gas, close the tail gas valve, and at the same time raise the temperature to 95°C, adjust the chlorine gas flow rate to 20L / min for 40 minutes; raise the temperature to 105°C, adjust the chlorine flow r...
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