Process for producing polyvinyl chloride polymerization organosilicon inarch polyether antifoam agent
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A technique for polymerizing silicone and grafted polyether, which is applied in the field of silicone grafted polyether defoamer for polyvinyl chloride polymerization. Effect of good thermal and chemical stability
Inactive Publication Date: 2008-07-16
河北盛华化工有限公司
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[0004] Some large companies have begun to try high-efficiency defoamers imported from abroad, such as the TEG02-18 defoamer from Henkel in Germany and the Bevaloid 6688 defoamer from Ronaplan in France. Produced defoamer, but the price is more expensive, generally 3-4 times higher than domestic products
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Embodiment 1
[0036] The first step, the synthesis of hydrogen-containing intermediates: various raw materials and proportions:
[0043] Add the raw materials hydrogen-containing silicone oil, octamethylcyclotetrasiloxane and hexamethyldisiloxane into the reaction kettle in portions, pre-mix first, stir for 30 minutes, and then add concentrated sulfuric acid with a concentration of 96-98%. The synthesis reaction was carried out at room temperature. After reacting for 10 hours, sodium carbonate was added to neutralize the sulfuric acid. After 3 hours of neutralization reaction, the material is discharged, filtered and packaged with a 300-mesh stainless steel mesh, and the hydrogen-containing intermediate is obtained.
[0044...
Embodiment 2
[0051] The first step, the synthesis of hydrogen-containing intermediates: various raw materials and proportions:
[0058] Add the raw materials hydrogen-containing silicone oil, octamethylcyclotetrasiloxane and hexamethyldisiloxane into the reaction kettle in portions, pre-mix first, stir for 30 minutes, and then add concentrated sulfuric acid with a concentration of 96-98%. The synthesis reaction was carried out at room temperature. After reacting for 10 hours, sodium carbonate was added to neutralize the sulfuric acid. After 3 hours of neutralization reaction, the material is discharged, filtered and packaged with a 300-mesh stainless steel mesh, and the hydrogen-containing intermediate is obtained.
[0...
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Abstract
The invention relates to fine chemical products, in particular to a preparation method of a polyvinyl chloride polymerization organic silicon graft polyether defoamer. A defoamer is used for defoaming and foam inhibition in the process of producing polyvinyl chloride in a suspension method. Domestic defomer is classified into two types, wherein, one is pure polyether type with poor defoaming effect and foam inhibition effect, and the other one is oil defoamer which has good effect but contaminates a PVC resin. Foreign high-efficiency defoamer has a better defoaming and inhibition effect, but the price is higher. The preparation method of the invention is that: step 1, the synthesis of hydrogenous midbody, and the raw material and the proportion are as follows: 100 portions of octamethylcy-clotetrasiloxane, 25 to 30 portions of hydrogen-containing silicone oil, 15 to 20 portions of hexamethyl disiloxane, 6 to 8 portions of oil of vitriol and 15 to 18 portions of sodium carbonate. Step 2, the graft of the hydrogenous midbody and polyether with the raw material and the proportion of 100 portions of hydrogenous midbody, 300 to 350 portions of polyether and 0.001 to 0.0015 portions of palladium chloride catalyst.
Description
1. Technical field [0001] The invention relates to fine chemical products, in particular to an organosilicon grafted polyether defoamer specially used for polyvinyl chloride polymerization. 2. Background technology [0002] In the process of producing polyvinyl chloride by the suspension method, due to the existence of the dispersant, the suspension produces a large amount of foam under the action of stirring. The foam contains vinyl chloride monomer and initiator. If the polymerization is continued, a large amount of sticky wall material will be generated in the top of the kettle and the reflux condenser, and the header leading to the reflux condenser from the top of the kettle will be blocked, making it difficult to carry out normal production. In order to solve these problems in the production process of PVC resin, since the early 1980s, the country began to develop and use defoamers. There are two main types, one is pure polyether type, and the other is oil type. Pure p...
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