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Method for comprehensively drying liquid rubber and drying device

A liquid rubber and drying device technology, applied in separation methods, chemical instruments and methods, evaporation, etc., can solve the problems of affecting solvent evaporation efficiency, short residence time, small changes in physical properties and appearance, etc., to improve drying efficiency and throughput , reduce residence time, avoid performance and appearance changes

Inactive Publication Date: 2012-09-26
LIAONING HEYUN SYNTHETIC RUBBER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopt this inventive method liquid rubber solution to be difficult to form thinner liquid film when flowing in this equipment, make the evaporation area of ​​unit volume liquid rubber solution limited, when adopting this inventive method, because the solvent volatilized by the barrier effect of tray is relatively small It is difficult to enter the upper condenser through the tray, which affects the volatilization efficiency of the solvent, and this invention is only suitable for the drying of liquid rubber with a relatively high concentration of the original emulsion (for example, the water content in the original emulsion is 63.2%). The volatile matter content requirement in the product is relatively low (such as volatile matter content<1%, and the volatile matter content requirement of the present invention is less than 0.5%), when the solvent content is larger, that is, when the concentration of the liquid rubber solution is smaller, it is difficult to pass through the method of the invention Obtain the qualified liquid rubber of volatile matter content, especially this inventive method is only suitable for the drying of liquid rubber viscosity less than 450Pa·S viscous material, when the viscosity of viscous material increases further, when for example viscosity is greater than 450Pa·S, viscous When the material passes through the middle hole of the concave-convex surface, the fluidity is poor, and it is easy to block the middle hole, which affects the normal drying of the liquid rubber; In the interim, the drying of end-group modified liquid butadiene rubber was introduced and compared with the stirring drying method. The drying efficiency of the thin film evaporator is much higher than that of the stirring tank, and the residence time of the material at high temperature is short, and the physical properties and appearance change little. , the volatile content is qualified, but this method only mentions the drying of liquid rubber with a number average molecular weight of less than 4000 and a viscosity of less than 70Pa·s, and does not mention the drying of liquid rubber with high molecular weight and high viscosity. When used for drying liquid rubber with high viscosity , will cause the liquid flow at the outlet of the thin film evaporator to be unsmooth, thus affecting the normal operation of the drying process, and this method is only suitable for the drying of liquid rubber with a large liquid rubber content in the liquid rubber solution or emulsion, that is, the solvent content is relatively low, such as about 50% liquid rubber. , when the liquid rubber content in the liquid rubber solution or emulsion is smaller, that is, the solvent content is larger, it is difficult to make the volatile content of the final product qualified

Method used

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  • Method for comprehensively drying liquid rubber and drying device
  • Method for comprehensively drying liquid rubber and drying device
  • Method for comprehensively drying liquid rubber and drying device

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The rubber solution to be dried is an isoprene liquid rubber cyclohexane solution containing an anti-aging agent with a weight concentration of 10%, a molecular weight of 30,000, and a molecular weight distribution of 1.07.

[0023] (1) The rubber solution to be dried enters step (1) at a speed of 800L / h figure 1 The concentrator 1 in the concentrator has a concentrated distributor and a concentrated demister, and the concentrated distributor 2 installed on the stirring shaft 8 is a disc with a concentric groove 2-1 and a raised structure 2-2, The grooves are used for liquid delivery, and the rising solvent ventilation holes are evenly distributed on the raised structure plane, and the rotation speed of the stirring shaft 8 is 300r / min. The concentrator 1 has a jacket, and the concentrator is heated by steam, and the system is evacuated to -50kPa by the concentrator vacuum pump 7, and the temperature in the concentrator is 80°C. The isoprene liquid rubber solution ...

Embodiment 2

[0031] According to the method of embodiment 1, the weight concentration that just needs to be dried rubber solution to change to contain antioxidant is 10%, and molecular weight is 30500, and molecular weight distribution is the butadiene liquid rubber cyclohexane solution of 1.10, and the obtained liquid polybutadiene The volatile content of the rubber is 0.07% by weight, the appearance is nearly colorless and transparent, the number average molecular weight is 30400, and the molecular weight distribution index is 1.11. The obtained liquid polyisoprene rubber had a viscosity of about 75 Pa·s at 38°C.

Embodiment 3

[0033] According to the method of Example 1, only the rubber solution to be dried is replaced with an anti-aging agent with a weight concentration of 10%, a molecular weight of 31100, and a molecular weight distribution of 1.12. Isoprene\butadiene (isoprene and butadiene The weight ratio is 50:50) copolymerized liquid rubber hydrogenated gasoline (boiling range is 55-100 ℃) solution, the volatile content of the obtained liquid polybutadiene rubber is 0.08% by weight, the appearance is close to colorless and transparent, and the number average The molecular weight was 31300, and the molecular weight distribution index was 1.12. The obtained liquid polyisoprene rubber had a viscosity of about 80 Pa·s at 38°C.

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Abstract

The invention provides a method for comprehensively drying liquid rubber. The method comprises the following steps of: 1) concentrating; and 2) performing thin film evaporation. The method for comprehensively drying the liquid rubber is suitable for drying the liquid rubber with both low viscosity and high viscosity, particularly the liquid rubber of which a liquid rubber solution or emulsion is low in concentration and high in solvent content, and the final product is high in viscosity. By adopting the drying device with a special structure and a combined mode, so that the drying efficiency and the treatment amount of the liquid rubber can be improved greatly, a liquid rubber product with qualified volatile matter can be obtained in a short period of time, and the residence time of the liquid rubber at high temperature can be reduced greatly; and therefore, the change of the performance and appearance of the liquid rubber remained at high temperature for a long time can be avoided.

Description

technical field [0001] The invention relates to a comprehensive drying method and drying device for liquid rubber. Background technique [0002] Liquid rubber is a viscous flowable liquid with an index average molecular weight of less than 100,000. Its main advantages are: easy to operate, can be processed by casting or injection, simple equipment, and convenient construction; it can produce rubber shoes, industrial products to tires Various rubber products; the best processing aids in the rubber industry, such as plasticizers, softeners, co-vulcanizing agents, modifiers, etc.; plasticizers in the plastics industry; potting agents and coating agents in the electronics industry ; and asphalt modifiers. In addition, liquid rubber can also be widely used to make various coatings such as anti-corrosion coatings, low-temperature coatings, electrical insulation coatings, water-soluble coatings and electrophoretic coatings, etc., which have the advantages of toughness and impact r...

Claims

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Application Information

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IPC IPC(8): C08C1/12C08C2/00B01D1/24
Inventor 孙育成裴素明迟海卢冬明刘丰群韩颖黄华翟芳静
Owner LIAONING HEYUN SYNTHETIC RUBBER RES INST
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