A method of obtaining a polyvinylchloride composition

 

(57) Abstract:

Usage: polymer-based building materials. Essence: polyvinyl chloride (PVC) mixed with chlorinated polyethylene, administered at 5 - 15% solution in carbon tetrachloride. The process is carried out at 40 - 50oC in aqueous medium in the presence of ionogenic emulsifier. The latter is introduced into the composition of emulsion PVC or add to the mixture containing suspension PVC, in the amount of 0.2% of water. table 1.

The invention relates to the field of modification of plastics, namely, the method of production of compositions based on polyvinyl chloride and chlorinated polyethylene, employees polymer basis for the manufacture of window frames, water troughs and other parts used in construction.

A method of obtaining legkoperevarivaemye compositions based on polyvinyl chloride and chlorinated polyolefins, in particular, chlorinated polyethylene, by mixing the powdered components [1]

The disadvantage of this method is the need for prior separation, drying and grinding chlorinated polyethylene.

The closest in technical essence is the JV shall Inishmore on stage latex, followed by separation of the composition to the spray dryer [2]

The disadvantages of this method is a complex process associated with the need to obtain a powder of polyethylene and the impossibility of obtaining a polymer composition containing more than 0.9 wt. chlorinated polyethylene.

The purpose of the invention is the simplification of the process by eliminating the stages of separation, drying and grinding for obtaining powdered chlorinated polyethylene, as well as a more profound modification of polyvinyl chloride by the introduction of more chlorinated polyethylene.

This objective is achieved in that the composition based on polyvinyl chloride and chlorinated polyethylene is produced by mixing the aqueous suspension of polyvinyl chloride with a solution of chlorinated polyethylene in carbon tetrachloride, taken directly after the stage of chlorination of the polyethylene and the process is conducted in the presence of ionogenic emulsifier, entered into the composition of emulsion polyvinyl chloride or added to the mixture containing the suspension polyvinyl chloride, in amount of 0.2 by weight of water.

The increase in the content of the emulsifier more than 0.2 mass. not economically feasible, and the process in the absence of p is icii.

Application for obtaining the compositions of the solution of the chlorinated polyethylene in carbon tetrachloride with a concentration of less than 5 is excluded by the fact that the obtaining of lower concentrations of polymer in the production environment is not economically feasible, and work with high-viscosity solutions of a concentration above 15 technically difficult.

The displacement components at a temperature below 40oC does not lead to the formation of a homogeneous particle size of the composition, and the temperature increases above the 50oC is not economically advisable.

The method allows to obtain compositions containing 85,0 to 99.9 wt. polyvinyl chloride and 0.1 to 15.0 wt. chlorinated polyethylene. The composition is determined by the requirements of specific products. In line with this is the amount added to the aqueous suspension of polyvinyl chloride, chlorinated polyethylene.

Example 1. In a two-liter three-neck reactor equipped with a stirrer, dropping funnel and downward fridge, pour 400 ml of water and add 189 g of polyvinyl chloride brand EJ (Kf64,3) with stirring, heated to 50oC and added dropwise within 15 minutes of 315 g of 7-aqueous solution of chlorinated polyethylene is neotrop of carbon tetrachloride with water. The resulting polymer composition is filtered on a Buechner funnel and dried in a vacuum drying Cabinet at 50oC. Get 207,9 g resin composition containing 100 wt. parts polyvinyl chloride 10 wt. parts chlorinated polyethylene. The quantitative output.

Example 2. According to the method described in example 1 to produce a mixture of 189 g of polyvinyl chloride brand EJ (Kf64,3) and 15 g 15-aqueous solution of chlorinated polyethylene containing 36, 2% of chlorine in carbon tetrachloride. Get 189,2 g resin composition containing 100 wt. parts polyvinyl chloride 0.1 wt.part of the chlorinated polyethylene. The quantitative output.

Example 3. According to the method described in example 1 to produce a mixture of 189 g of polyvinyl chloride brand EJ (Kf64,3) and 405 g of 7-aqueous solution of chlorinated polyethylene containing 36,2 chlorine in carbon tetrachloride. Get 217,4 g of the composition containing per 100 wt.parts polyvinyl chloride 15 wt. parts chlorinated polyethylene. The quantitative output.

Example 4. In a two-liter three-neck reactor equipped with a stirrer, dropping funnel and downward fridge, pour 400 ml of water, add 0.8 g (0,2) alkylsulfonate and 189 g polyvinylchloride 15 minutes 360 g of 5-aqueous solution of chlorinated polyethylene containing 37,4 chlorine in carbon tetrachloride. Next, the temperature in the reactor was raised to 85 90oC and distilled azeotrope of carbon tetrachloride with water. The resulting polymer composition is filtered on a Buechner funnel and dried in a vacuum drying Cabinet at 50oC.

Get 207,9 g resin composition containing 100 wt. parts polyvinyl chloride 10 wt.parts chlorinated polyethylene. The quantitative output.

Example 5. According to the method described in example 4, to produce a mixture of 189 g of polyvinyl chloride brand SM (Kf72) and 2.0 g of 10-aqueous solution of chlorinated polyethylene containing 37,4 chlorine in carbon tetrachloride. Get 189,2 g resin composition containing 100 wt. parts polyvinyl chloride 0.1 wt. part of the chlorinated polyethylene. The quantitative output.

Example 6. According to the method described in example 4, to produce a mixture of 189 g of polyvinyl chloride brand SM (Kf72) and 217,4 g 10-aqueous solution of chlorinated polyethylene containing 37,4 chlorine in carbon tetrachloride. Get to 217.5 g of the composition containing per 100 wt. parts polyvinyl chloride 15 wt. parts chlorinated polyethylene. VehicIe based on polyvinyl chloride and chlorinated polyethylene are shown in table.

As can be seen from the table, the proposed method allows to obtain a composition containing 15 times the quantity of chlorinated polyethylene, resulting in the formation of polymer base compositions used for the manufacture of window units and other specialized products used in the building materials industry [3] in Addition, the use of chlorinated polyethylene in the form of its solution in carbon tetrachloride allows you to use this solution, obtained directly after stage chlorination of polyethylene, and to avoid energy-intensive phase separation, drying and grinding chlorinated polyethylene.

The sources of information.

1. U.S. patent N 3682924, 1971.

2. Copyright certificate NRB N 13735, 1971.

3. Japanese patent N 61-308759, 1988.

A method of obtaining a polyvinylchloride composition by mixing polyvinyl chloride with chlorinated polyethylene, characterized in that the chlorinated polyethylene is injected in the form of 5 to 15% solution in carbon tetrachloride and the process is carried out at 40 to 50oWith in aqueous medium in the presence of ionogenic emulsifier, entered into the composition of emulsion polyvinyl chloride or add to mixture

 

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