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Method for agglomerating rubber latex

A rubber latex and latex technology, which is applied in the field of rubber latex coagulation, can solve the problems of large production consumption, low efficiency and large amount of filler, and achieve the effects of high production efficiency, low impurity content and short coagulation time.

Active Publication Date: 2012-12-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid mixture is conveyed through at least one throttling position arranged in the pipe, which has a variable throttling cross-section; the method is characterized by mixing first and throttling, that is, mixing the rubber latex and filler into a suspension and throttling Mixing, then adding coagulant or coating agent and then further throttling mixing, this method consumes a lot of fillers, the efficiency is not high, and the production consumption is relatively large

Method used

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  • Method for agglomerating rubber latex
  • Method for agglomerating rubber latex
  • Method for agglomerating rubber latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The latex coagulation device usesfigure 1 In the device shown, the diameter of the main pipe is DN125, and the diameter of the branch pipe is DN100. The coagulation temperature is 35°C, and the coagulation time is 2 minutes. (coagulation time refers to the time interval from latex and coagulant starting to add coagulation tube to coagulation flow into receiving box, and the following examples are the same.)

[0048] The first step: the saturated sodium chloride solution is mixed with soft water to form a mixed solution A;

[0049] The second step: the NBR latex is sent to the latex coagulation device through the filter by the pump of the storage tank-the coagulation main pipe, and the mixed solution A sent to the first branch pipe in the first nozzle (its addition is 25% of the latex solid content) %) mixed to form flocs;

[0050] The third step: the floc obtained in the second step is mixed with the mixed solution B (the addition amount is 8% of the latex solid conte...

Embodiment 2

[0054] The latex coagulation device uses figure 1 In the device shown, the diameter of the main pipe is DN125, and the diameter of the branch pipe is DN100. The coagulation temperature is 40°C, and the coagulation time is 4 minutes.

[0055] The first step: the saturated sodium chloride solution is mixed with soft water to form a mixed solution A;

[0056] Second step: the NBR latex sent to the coagulation tube through the filter by the storage tank is mixed with the mixed solution A (its addition is 18% of the latex solid content) in the first nozzle to form flocs;

[0057] The third step: mix the floc obtained in the second step with the mixed solution B (MgSO 4 Aqueous solution, the addition amount is 12% of latex solid content) mixes, forms coagulation;

[0058] The fourth step: the condensate obtained in the third step is mixed with water in the third nozzle, the condensate is added to the slurry receiving tank along the pipeline, and the release agent potassium steara...

Embodiment 3

[0060] The latex coagulation device uses figure 1 In the device shown, the diameter of the main pipe is DN125, and the diameter of the branch pipe is DN100. The coagulation temperature is 35°C, and the coagulation time is 5 minutes.

[0061] The first step: the saturated sodium chloride solution is mixed with soft water to form a mixed solution A;

[0062] Second step: the NBR latex sent to the coagulation tube through the filter by the storage tank is mixed with the mixed solution A (its addition is 25% of the latex solid content) in the first nozzle to form flocs;

[0063] The third step: the floc obtained in the second step is mixed with the mixed solution B (the addition amount is 8-9% of the solid content of the latex) in the second nozzle to form a coagulation; B is ZnSO 4 aqueous solution.

[0064] The fourth step: the condensate obtained in the third step is mixed with water in the third nozzle, and the condensate is added to the receiving box in front of the filter...

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Abstract

The invention relates to a method for continuously agglomerating latex at low energy consumption and high production efficiency. A tubular static mixer is adopted; rubber latex is added into a main tube, branch tubes are convergent to be added with a flocculant or / and other aids, one or more nozzles are arranged in the main tube, and the branch tubes are preferably arranged on the rear of the nozzles. One or more branch tubes can be arranged, and are respectively used as pipelines for addition of the flocculant or / and other aids; and the branch tubes are arranged on the rear of the nozzles, so that the latex and the flocculant are continuously mixed at certain temperature for certain time, and the latex is continuously agglomerated into a suspended mixture containing small solid rubber particles and agglomerated mother solution in a turbulence flowing state. Rubber particles prepared by the method for agglomerating the latex are uniform and low in impurity content; and the agglomeration time is short and the production efficiency is high. The method is suitable for strong cohesiveness synthetic rubber latex and natural rubber latex which contains gel or no gel, has high or low Mooney viscosity, is provided with polar groups and the like.

Description

technical field [0001] The invention relates to a coagulation method of rubber latex, more specifically, a continuous coagulation method of rubber latex. Background technique [0002] At present, there are many kinds of coagulation methods related to latex, such as the positive coagulation method of adding coagulant with latex as raw material; the anti-coagulation method of adding latex with coagulant as raw material; . [0003] Positive aggregation method: [0004] The direct coagulation method refers to the method of adding a coagulant to the latex in stages under stirring conditions, or directly adding the latex to the coagulant to coagulate the rubber. Although rubber with good performance can be obtained, this method is intermittently prepared. Production The efficiency is low, the energy consumption is high, and the shape of the rubber after coagulation is irregular and the shape is large, so it needs to be pressed and packaged. [0005] The preparation method of ni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C1/14C08C1/15
Inventor 张元寿赵继忠梁滔钟启林于奎桂强徐典宏孙红霞董万卓吴宇张志强李炳泉朱晶武爱军
Owner PETROCHINA CO LTD