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High-efficiency and environment-friendly polyvinyl chloride polymerization process

A technology of polyvinyl chloride and polymerization process, applied in the field of polyvinyl chloride preparation, can solve the problems of physical and mechanical performance indicators not meeting the requirements, affecting the application range, low product purity, etc. High conversion effect

Inactive Publication Date: 2017-08-29
HWASU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bulk polymerization method in the prior art refers to the direct reaction of monomers and initiators. The polyvinyl chloride product has a large particle size and is prone to agglomeration or caking phenomenon. At the same time, the initiator and the produced hydrogen chloride are mixed in the polyvinyl chloride. In ethylene products, the product has low purity and poor quality, and the physical and mechanical properties of the product do not meet the requirements, which affects its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A highly efficient and environment-friendly polyvinyl chloride polymerization process comprises the following specific steps:

[0026] (1) First, add 3Kg of azobisisobutyronitrile and 12Kg of barium sulfate into 100Kg of methanol solvent, heat to 56°C, then use a liquid sprayer to spray into the reaction kettle, and the blower installed inside the reaction kettle blows into 56°C Hot air makes the small droplets formed by azobisisobutyronitrile and barium sulfate suspended in the reaction kettle and circulates up and down;

[0027] (2), then feed the gaseous vinyl chloride monomer with a flow rate of 5L / min, the gas feeding time is 5min, and the reaction is 15min;

[0028] (3) Continue to feed the gaseous vinyl chloride monomer with a flow rate of 5L / min, the gas feeding time is 30min, and the reaction is 60min;

[0029] (4) Use the wind force of the blower to sweep the droplet-shaped methanol mixed system mixed with azobisisobutyronitrile and barium sulfate into anothe...

Embodiment 2

[0033] A highly efficient and environment-friendly polyvinyl chloride polymerization process comprises the following specific steps:

[0034] (1) First, add 1Kg of dicumyl peroxide and 15Kg of aluminum hydroxide into 100Kg of ethanol solvent, heat it to 68°C, then use a liquid sprayer to spray it into the reaction kettle, and the blower installed inside the reaction kettle blows it into 68°C The hot air makes the small droplets formed by dicumyl peroxide and aluminum hydroxide suspended in the reactor and circulates up and down;

[0035] (2), then feed the gaseous vinyl chloride monomer with a flow rate of 5L / min, the gas feeding time is 5min, and the reaction is 10min;

[0036] (3) Continue to feed the gaseous vinyl chloride monomer with a flow rate of 5L / min, the gas feeding time is 10 minutes, and the reaction is 30 minutes;

[0037](4) Use the wind force of the blower to blow the droplet ethanol mixed system mixed with dicumyl peroxide and aluminum hydroxide into another ...

Embodiment 3

[0041] A highly efficient and environment-friendly polyvinyl chloride polymerization process comprises the following specific steps:

[0042] (1) First, add 5Kg dimethyl azobisisobutyrate and 8Kg talcum powder into 100Kg methanol solvent, heat to 54°C, then use a liquid sprayer to spray into the reaction kettle, and the blower installed inside the reaction kettle blows The hot air at 54°C suspends the small droplets formed by dimethyl azobisisobutyrate and talcum powder in the reactor and circulates up and down;

[0043] (2), then feed the gaseous vinyl chloride monomer with a flow rate of 5L / min, the gas feeding time is 5min, and the reaction is 30min;

[0044] (3) Continue to feed the gaseous vinyl chloride monomer with a flow rate of 5L / min, the gas feeding time is 50min, and the reaction is 90min;

[0045] (4) Use the wind force of the blower to sweep the droplet-shaped methanol mixed system mixed with dimethyl azobisisobutyrate and talcum powder into another collection t...

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Abstract

The invention provides a high-efficiency and environment-friendly polyvinyl chloride polymerization process, which comprises the steps of adding an initiator and an anti-adhesive agent to a low-boiling-point organic solvent; under a heating condition, spraying the solution into a reaction kettle by using a liquid sprayer to form liquid drops; carrying out up and down circulating motion on the suspending liquid drops under the action of hot air of a blast blower; and adding vinyl chloride gas twice, removing impurity gas or liquid drops and drying to obtain a granular product. Compared with the prior art, the high-efficiency and environment-friendly polyvinyl chloride polymerization process has the advantages that the initiation effect is increased and the product is good in mobility and uniform in granularity; the probability of forming monomer radicals by primary radicals and vinyl chloride molecules is increased to accelerate the reaction process; according to the properties that polyvinyl chloride is not dissolved into methyl alcohol or ethyl alcohol and is relatively large in granularity, quick and effective separation of polyvinyl chloride from other substances is achieved through a filter plate and a product is high in purity; and the technique is convenient to operate, low in additive dosage, few in addition variety, high in polymerization conversion rate and free of liquid or solid waste, and thus has a wide application prospect.

Description

technical field [0001] The invention relates to the field of polyvinyl chloride preparation, in particular to an efficient and environment-friendly polyvinyl chloride polymerization process. Background technique [0002] Polyvinyl chloride, English abbreviation PVC (Polyvinyl chloride), is a polymer formed by the polymerization of vinyl chloride monomer according to the mechanism of free radical polymerization. It is a white powder with an amorphous structure, with a small degree of branching and a relative density of about 1.4. Glass The melting temperature is 77-90°C, and the stability to light and heat is poor. In practical applications, a stabilizer must be added to improve the stability to heat and light. The molecular weight of industrially produced PVC is generally in the range of 50,000-110,000. It has a large polydispersity. The molecular weight increases with the decrease of the polymerization temperature. There is no fixed melting point. It starts to soften at 80-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/06C08F4/04C08F4/34
CPCC08F114/06C08F4/04C08F4/34
Inventor 丘永桂李毅王小勇王明钦魏昭辉
Owner HWASU
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