A kind of method for preparing chlorinated polyvinyl chloride resin based on tubular reactor

A chlorinated polyvinyl chloride, tubular reactor technology, applied in the field of new polymer materials and new processes, can solve the problems of high production cost, low production efficiency, poor chlorination uniformity, etc. The effect of reducing production cost and improving thermal stability

Active Publication Date: 2021-04-13
山东高信化学股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above method improves the thermal stability of chlorinated polyvinyl chloride resin, but the uniformity of chlorination is poor, the Vicat softening temperature is low, and the market application range is narrow
The following problems exist in the prior art: poor chlorination uniformity of chlorinated polyvinyl chloride resin; poor chlorination thermal stability of chlorinated polyvinyl chloride resin; low production efficiency and high production cost

Method used

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  • A kind of method for preparing chlorinated polyvinyl chloride resin based on tubular reactor
  • A kind of method for preparing chlorinated polyvinyl chloride resin based on tubular reactor
  • A kind of method for preparing chlorinated polyvinyl chloride resin based on tubular reactor

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Experimental program
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Effect test

Embodiment 1

[0048] (1), ingredients

[0049] Put the material into the batching kettle, stir evenly, and wait for the material to be transferred.

[0050] Materials include 1600kg PVC resin, 8000kg medium, 0.8kg dispersant, 2.4kg initiator.

[0051] Among them, PVC resin is selected with an apparent density of 0.60g / ml, a particle size of 100-130μm, and a porosity of 20-30%;

[0052] The reaction medium is deionized water or dilute hydrochloric acid water, and the concentration of hydrochloric acid water is 1%-3%;

[0053] The dispersant is one of polyvinyl alcohol, sodium polymethacrylate and sodium polystyrene sulfonate.

[0054] Initiators include low-temperature initiators and medium-temperature initiators;

[0055] The dosage ratio of low-temperature and medium-temperature initiators is 3:1;

[0056] The low-temperature initiator is one or more of diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate or tert-butyl peroxy tert-valerate;

[0057] The medium-temperature ini...

Embodiment 2

[0065] Embodiment 2 adopts the batching method identical with embodiment 1, has changed material feeding speed, reaction time, chlorine feeding speed.

[0066] Medium temperature reaction stage: press the material to 0.09m 3 / min, that is, 14.4kg / min speed is pressed into the first reactor, the liquid chlorine feed rate is 4.5kg / min, the reaction time is 3min, the temperature is 60-100°C, and the temperature is controlled from the inlet to the outlet according to 1.33°C / dm regular increase.

[0067] High-temperature reaction stage: After the reaction in the medium-temperature reactor is completed, it is directly transferred to the second reactor. The reaction time in the high-temperature reactor is 3 minutes, the feeding rate of liquid chlorine is 6.2kg / min, and the temperature is 100-120°C. The temperature is controlled by the feed From the outlet to the discharge outlet, it increases gradually according to the law of 0.67°C / dm.

[0068] Chlorine passage time in the middle ...

Embodiment 3

[0070] Embodiment 3 adopts the batching method identical with embodiment 1, has changed material feeding speed, reaction time, chlorine feeding speed.

[0071] Medium temperature reaction stage: press the material to 0.07m 3 / min, that is, the speed of 11.2kg / min is pressed into the first reactor, the feeding speed of liquid chlorine is 3.5kg / min, the reaction time is 4min, the temperature is 60-100°C, and the temperature is controlled from the inlet to the outlet according to 1.33°C / dm regular increase.

[0072] High-temperature reaction stage: After the reaction in the medium-temperature reactor is completed, it is directly transferred to the second reactor. The reaction time in the high-temperature reactor is 4 minutes, the feeding rate of liquid chlorine is 4.7kg / min, and the temperature is 100-120°C. The temperature is controlled by the feed From the outlet to the discharge outlet, it increases gradually according to the law of 0.67°C / dm.

[0073] Chlorine passage time ...

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Abstract

The invention discloses a method for preparing chlorinated polyvinyl chloride resin based on a tubular reactor. The method includes a batching step, a chlorination step, and a post-treatment step. The chlorination step is divided into a medium-temperature reaction stage and a high-temperature reaction stage; The reaction stage is carried out in the first reactor; the high temperature reaction stage is carried out in the second reactor; the first reactor and the second reactor are tubular reactors. Compared with the prior art, it can effectively prevent the bonding between the resin particles, improve the chlorination uniformity of the chlorinated polyvinyl chloride resin, improve the thermal stability of the chlorinated polyvinyl chloride resin, and effectively control the reaction temperature. The heat released by the chemical substitution reaction can be exported in time to achieve strict temperature control; at the same time, the tubular reactor is made of silicon carbide, which is durable and not easy to damage, and the equipment occupies a small area. reduce manufacturing cost.

Description

technical field [0001] The invention relates to a chlorinated polyvinyl chloride resin chlorination process technology, in particular to a tubular reactor preparation method for a chlorinated polyvinyl chloride resin, and belongs to the technical field of new polymer materials and new processes. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) resin is a product of polyvinyl chloride (PVC) resin modified by chlorination. Due to the increase of chlorine content, the intermolecular polarity increases, so that the product has better corrosion resistance, Heat resistance, flame retardancy, mechanical strength and other properties. In foreign countries, CPVC resin has replaced some traditional general-purpose plastic pipes and metal pipes in a certain range, and is widely used in hot and cold water piping systems, fire sprinkler piping systems, corrosion-resistant and high-temperature resistant piping systems, power pipe buried Ground laying and some plates, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/22C08F114/06
CPCC08F8/22C08F114/06
Inventor 胡海波金胜波张道同孙猛侯兰明
Owner 山东高信化学股份有限公司
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