Method for comprehensively drying liquid rubber and drying device

[0021] Example 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 In the concentrator 1, the concentrator is equipped with a concentrating distributor and a concentrating demister, a disc with a concentric groove 2-1 and a raised structure 2-2 of the concentrating distributor 2 installed on the stirring shaft 8, The grooves are used for liquid transportation, the raised solvent vent holes are evenly distributed on the plane of the raised structure, and the rotating speed of the stirring shaft 8 is 300r/min. The concentrator 1 is jacketed, the concentrator is heated by steam, the system is evacuated to -50kPa by the concentrating vacuum pump 7, and the temperature in the concentrator is 80°C. The isoprene liquid rubber solution entering the concentrator is first uniformly distributed on the wall of the concentrator through the rotating distributor, and the volatilized solvent goes up, and enters the concentrated solvent condenser 5 and the concentrated solvent storage tank through the distributor and the demister. 6. The concentrated liquid rubber solution flows down the concentrator and enters the concentrated liquid storage tank 4 . The liquid rubber weight content in the concentrate is 80%.

[0024] (2) The concentrated liquid rubber solution enters continuously from the concentrated liquid storage tank 4 image 3 In the thin film evaporator 9, the liquid level of the concentrated liquid storage tank is kept unchanged during the feeding process, and the liquid flow rate entering the thin film evaporator is about 100L/h. The concentrated liquid entering the thin-film evaporator first flows to the wall of the thin-film evaporator through the evaporation distributor 11, and is evenly distributed on the wall of the thin-film evaporator under the action of the rotating scraper 10, and the solution on the wall is used by the scraper. Scrape into a very thin liquid film, use a fixed scraper for high viscosity liquid rubber, and use a movable scraper for low viscosity liquid rubber. The included angle is 45 degrees, so that the invention is not only suitable for drying liquid rubber with small viscosity, but also suitable for drying liquid rubber with large viscosity, especially suitable for drying liquid rubber with large viscosity. The solvent volatilized on the wall of the thin film evaporator enters the evaporative solvent condenser 13 and the evaporative solvent storage tank 14 through the evaporative distributor 11 and the evaporative demister 12, and the dried liquid rubber flows down the thin film evaporator and enters the liquid rubber storage tank 16. The thin film evaporator is jacketed, the thin film evaporator is heated by steam, the system is evacuated to -90kPa by the vacuum pump 15, and the temperature of the evaporator is 100°C.

[0025] The liquid polyisoprene rubber obtained after drying has a volatile content of 0.08% by weight, an appearance close to colorless and transparent, a number-average molecular weight of 30100, and a molecular weight distribution index of 1.08. The viscosity of liquid polyisoprene rubber at 38°C is about 90 Pa·s.

[0030] Example 2

[0031] According to the method for embodiment 1, only the weight concentration that the rubber solution to be dried is replaced with an anti-aging agent is 10%, the molecular weight is 30500, and the molecular weight distribution is the butadiene liquid rubber cyclohexane solution of 1.10, the liquid polybutadiene that obtains The volatile content of the rubber was 0.07% by weight, the appearance was nearly colorless and transparent, the number average molecular weight was 30400, and the molecular weight distribution index was 1.11. The viscosity of the obtained liquid polyisoprene rubber at 38°C was about 75 Pa·s.

[0032] Example 3

[0033] According to the method of embodiment 1, only the weight concentration that the rubber solution to be dried is replaced with an anti-aging agent is 10%, the molecular weight is 31100, and the molecular weight distribution is the isoprene\butadiene (isoprene and butadiene) of 1.12. The weight ratio of 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 viscosity of the obtained liquid polyisoprene rubber at 38°C was about 80 Pa·s.