One-step method for producing chlorinated polyethylene

Abstract

The invention discloses a one-step production method of chlorinated polyethylene. The method comprises the following steps: adding 10-20 parts by mass of high-density polyethylene to 80-90 parts by mass of water to generate a chlorination in the presence of an emulgator, a dispersing agent, an initiator and chlorine gas, adding 5-7 parts by mass of calcium oxide in batches in the chlorination process, thus generating chlorinated polyethylene resin and an aqueous solution of calcium chloride, wherein the addition speed of calcium oxide has to ensure that the pH value of the reaction system is controlled to be between 7.0 and 8.5; centrifuging and drying the obtained chlorinated polyethylene resin to obtain a finished chlorinated polyethylene product; and concentrating and drying the aqueous solution of calcium chloride to obtain a byproduct calcium chloride. The one-step production method of chlorinated polyethylene has the advantages that the process flow is simplified, the space occupied by devices and investment in devices are reduced, and the production cost is lowered; in the preparation process of chlorinated polyethylene, waste acid water is made a full use and prepared into a byproduct, and therefore the clean production level is high and relatively high economic benefit can be created.

Description

1. Technical field

[0001] The present invention relates to the preparation method of macromolecular compound, exactly one-step method production chlorinated polyethylene and its preparation method. 2. Background technology

[0002] At present, the industrialized chlorinated polyethylene (CPE) production equipment that has been built in my country generally adopts the water phase production process, that is, the polyethylene (PE) powder is dispersed in the water phase medium and chlorine gas is introduced, and the chlorinated modified polyethylene is produced. Get CPE products. The reaction process is as follows:

[0003]

[0004] It can be seen from the above reaction principle that in the production process of the water phase method, hydrogen chloride products are generated, and hydrochloric acid is formed in the water phase system, and the generated CPE is a porous elastic polymer material, resulting in a large amount of hydrochloric acid adsorbed on the surface and int...

Examples

Embodiment 1

[0024] Dissolve 2.0g of sodium dodecylbenzenesulfonate, 8.0g of OP-10, 10.0g of polyolefin pyrrolidone (k-30), and 70.0g of active silica in 1000g of water, put them into the reactor, and add 1.0 g benzoyl peroxide, 100.0g high-density polyethylene, close the reactor, raise the temperature to 80°C, and start to feed chlorine gas. 2.5 hours, then keep warm at 135°C for 1 hour. Calcium oxide is added in batches during the reaction process, the calcium oxide is added at a rate such that the pH value of the reaction system is controlled between 7.0 and 8.5, and the total amount of calcium oxide added is 40 g.

[0025] When the kettle temperature drops to 80°C, the reaction system is purged with compressed air, the materials in the kettle are centrifuged, and the solid chlorinated polyethylene is dried to obtain a CPE product with a chlorine content of 35.5%; the centrifuged mother liquor is concentrated and dried to obtain dihydrate with a content of 70.1%. Calcium chloride 105.0...

Embodiment 2

[0027] Dissolve 0.3g of sodium dodecylbenzenesulfonate, 0.7g of OP-10, and 5.0g of polyolefin pyrrolidone (k-30) in 1000g of water, put them into the reactor, and add 5.0g of benzoyl peroxide, 200.0g high-density polyethylene airtight reactor, heat up to 80°C, start to feed chlorine gas, when the temperature rises to 135°C, feed 210.0g of chlorine gas in total, stop chlorine flow, chlorine flow time is 2.5 hours, keep warm at 135°C for 1 Hour. Calcium oxide was added in batches during the reaction, the rate of calcium oxide addition was such that the pH value of the reaction system was controlled between 7.0 and 8.5, and the total amount of calcium oxide added was 81 g.

[0028] When the temperature of the kettle drops to 80°C, the reaction system is purged with compressed air, the materials in the kettle are centrifuged, and the solid chlorinated polyethylene is dried to obtain a CPE product with a chlorine content of 36.0%; the centrifuged mother liquor is concentrated and d...

Embodiment 3

[0030] Dissolve 2.0g of sodium dodecylbenzenesulfonate, 8.0g of OP-10, 10.0g of polyolefin pyrrolidone (k-30), and 70.0g of active silica in 1000g of water, put them into the reactor, and add 1.0 g azobisisobutyronitrile, 100.0g high-density polyethylene, seal the reactor, raise the temperature to 80°C, and start to feed chlorine gas. The time is 2.5 hours, and the temperature is kept at 135° C. for 1 hour. Calcium oxide is added in batches during the reaction process, the calcium oxide is added at a rate such that the pH value of the reaction system is controlled between 7.0 and 8.5, and the total amount of calcium oxide added is 40 g.

[0031] When the kettle temperature drops to 80°C, the reaction system is purged with compressed air, the materials in the kettle are centrifuged, and the solid chlorinated polyethylene is dried to obtain a finished product with a chlorine content of 35.8% CPE; the centrifuged mother liquor is concentrated and dried to obtain a dihydrate with ...

1. Technical field

[0001] The present invention relates to the preparation method of macromolecular compound, exactly one-step method production chlorinated polyethylene and its preparation method. 2. Background technology

[0002] At present, the industrialized chlorinated polyethylene (CPE) production equipment that has been built in my country generally adopts the water phase production process, that is, the polyethylene (PE) powder is dispersed in the water phase medium and chlorine gas is introduced, and the chlorinated modified polyethylene is produced. Get CPE products. The reaction process is as follows:

[0003]

[0004] It can be seen from the above reaction principle that in the production process of the water phase method, hydrogen chloride products are generated, and hydrochloric acid is formed in the water phase system, and the generated CPE is a porous elastic polymer material, resulting in a large amount of hydrochloric acid adsorbed on the surface and int...

Examples

Embodiment 1

[0024] Dissolve 2.0g of sodium dodecylbenzenesulfonate, 8.0g of OP-10, 10.0g of polyolefin pyrrolidone (k-30), and 70.0g of active silica in 1000g of water, put them into the reactor, and add 1.0 g benzoyl peroxide, 100.0g high-density polyethylene, close the reactor, raise the temperature to 80°C, and start to feed chlorine gas. 2.5 hours, then keep warm at 135°C for 1 hour. Calcium oxide is added in batches during the reaction process, the calcium oxide is added at a rate such that the pH value of the reaction system is controlled between 7.0 and 8.5, and the total amount of calcium oxide added is 40 g.

[0025] When the kettle temperature drops to 80°C, the reaction system is purged with compressed air, the materials in the kettle are centrifuged, and the solid chlorinated polyethylene is dried to obtain a CPE product with a chlorine content of 35.5%; the centrifuged mother liquor is concentrated and dried to obtain dihydrate with a content of 70.1%. Calcium chloride 105.0...

Embodiment 2

[0027] Dissolve 0.3g of sodium dodecylbenzenesulfonate, 0.7g of OP-10, and 5.0g of polyolefin pyrrolidone (k-30) in 1000g of water, put them into the reactor, and add 5.0g of benzoyl peroxide, 200.0g high-density polyethylene airtight reactor, heat up to 80°C, start to feed chlorine gas, when the temperature rises to 135°C, feed 210.0g of chlorine gas in total, stop chlorine flow, chlorine flow time is 2.5 hours, keep warm at 135°C for 1 Hour. Calcium oxide was added in batches during the reaction, the rate of calcium oxide addition was such that the pH value of the reaction system was controlled between 7.0 and 8.5, and the total amount of calcium oxide added was 81 g.

[0028] When the temperature of the kettle drops to 80°C, the reaction system is purged with compressed air, the materials in the kettle are centrifuged, and the solid chlorinated polyethylene is dried to obtain a CPE product with a chlorine content of 36.0%; the centrifuged mother liquor is concentrated and d...

Embodiment 3

[0030] Dissolve 2.0g of sodium dodecylbenzenesulfonate, 8.0g of OP-10, 10.0g of polyolefin pyrrolidone (k-30), and 70.0g of active silica in 1000g of water, put them into the reactor, and add 1.0 g azobisisobutyronitrile, 100.0g high-density polyethylene, seal the reactor, raise the temperature to 80°C, and start to feed chlorine gas. The time is 2.5 hours, and the temperature is kept at 135° C. for 1 hour. Calcium oxide is added in batches during the reaction process, the calcium oxide is added at a rate such that the pH value of the reaction system is controlled between 7.0 and 8.5, and the total amount of calcium oxide added is 40 g.

[0031] When the kettle temperature drops to 80°C, the reaction system is purged with compressed air, the materials in the kettle are centrifuged, and the solid chlorinated polyethylene is dried to obtain a finished product with a chlorine content of 35.8% CPE; the centrifuged mother liquor is concentrated and dried to obtain a dihydrate with ...

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