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A kind of natural rubber latex multiphase co-current coagulation method

A natural latex and latex technology, applied in the field of natural latex multiphase co-current coagulation, can solve problems such as difficult operation of the coagulation process, uneven thickness of the wet gel, and affecting the continuity of processing, so as to achieve good product consistency and ensure continuous process Sexuality, the effect of ensuring product consistency

Active Publication Date: 2022-06-07
HAINAN ZHONG XIANG TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The coagulation co-sedimentation time matches the dispersion of the powder slurry in the latex and the process continuity. If the latex coagulation and co-sedimentation time is too long after the powder filler is fully dispersed, the powder filler will settle due to its specific gravity , the filler content of the latex powder in the lower layer is higher than that in the upper layer, which affects the consistency of the product; and when the latex solidification time is too short, the latex has solidified before flowing to the end of the solidification tank, resulting in uneven thickness of the wet gel and affecting the continuity of processing , and it is difficult to operate because the solidification process is too fast

Method used

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  • A kind of natural rubber latex multiphase co-current coagulation method
  • A kind of natural rubber latex multiphase co-current coagulation method
  • A kind of natural rubber latex multiphase co-current coagulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A natural latex multiphase coagulation method consisting of the following steps:

[0027] S1: The powder filler (nano clay) is dispersed in water to make a filler slurry with a mass concentration of 20%;

[0028] S2: Filler slurry and natural latex high-speed mixing, mixing speed of 2000r / min, time 15min, to get latex mixture; The temperature of the latex mixture is controlled at 25~28°C;

[0029] S3: Through the two phases of parallel flow, the mass concentration of 2% acid (acetic acid) and latex mixture at the same time through gravity transport into the mixing hopper, and then automatically mixed in the mixing hopper and into the solidification tank solidification co-settling, co-settling time of 20min, the ambient temperature of co-settling when coagulating co-sinking is 32 ~ 35 ° C.

[0030] The mass ratio of the powder filler to natural latex and acid is 1:150:20, wherein the natural latex is measured by dry glue.

[0031] Real-time flow control of filler slurry, nat...

Embodiment 2

[0033] A natural latex multiphase coagulation method consisting of the following steps:

[0034] S1: The powder filler (silica) is dispersed in water to make a filler slurry with a mass concentration of 30%;

[0035] S2: Filler slurry and natural latex high-speed mixing, mixing speed of 5000r / min, time 45min, to get latex mixture; The temperature of the latex mixture is controlled at 25~28°C;

[0036] S3: Through two phases of parallel flow, the mass concentration of 3% acid (formic acid) and latex mixture at the same time through gravity into the mixing hopper, and then automatically mixed in the mixing hopper and into the solidification tank solidification co-settling, co-settling time of 60min, ambient temperature of 32 ~ 35 °C.

[0037]The mass ratio of the powder filler to natural latex and acid is 1:180:25, wherein the natural latex is measured by dry glue.

[0038] Real-time flow control of filler slurry, natural latex and acid liquid is carried out by flow calculator.

Embodiment 3

[0040] The difference between Example 3 and Example 1 is: the speed of high-speed mixing in step S2 is 3000r / m, and the mixing time is 15min.

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Abstract

The invention discloses a multi-phase co-current coagulation method of natural latex, which comprises the steps of mixing powder filler slurry with natural latex at high speed, mixing acid solution and latex mixed solution through two-phase co-current, coagulation and co-precipitation, and the like. In the present invention, the filler can be evenly dispersed in the natural latex through the reasonable combination of the ratio of the filler and the latex, the stirring speed, the stirring time and the coagulation co-sedimentation speed, and the co-sedimentation with the latex during the coagulation process ensures the consistency of the product. The finished product is of good quality.

Description

Technical field [0001] The present invention relates to a natural latex heterogeneous coagulation method, belongs to the field of natural latex processing technology. Background [0002] Natural rubber (NR) is a kind of natural polymer compound mainly processed from the three-leaf rubber tree latex, through the filling of powder filler, you can obtain inorganic powder / natural rubber composite material with good comprehensive performance, widely used in tires, hoses, tapes and various industrial rubber products. [0003] Powder fillers such as silica, nano clay, etc. due to their polarity, specific gravity, often can not match the sedimentation rate of latex, resulting in the dispersion of the reinforcing agent in the latex system is not easy to be uniform, often damage to the performance of rubber. In order to achieve a better dispersion and reinforcement effect of wet mixing, the wet mixing process must meet the following basic conditions: (1) Powder filler particles can be un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/02C08K3/34C08K3/36C08K3/04C08C1/15C08C1/14C08J3/205
CPCC08K3/346C08K3/36C08K3/042C08C1/15C08C1/14C08K2201/011C08L7/02
Inventor 丁爱武林壮苧李德新唐海龙白先权王任飞李奇胜谢兴怀
Owner HAINAN ZHONG XIANG TECH CO LTD