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Non-acid flocculation method for styrene-butadiene latex

A technology of styrene-butadiene latex and styrene-butadiene rubber, which is applied in the field of green and environmental protection flocculation, can solve problems such as pollution, storage difficulties, and increased processing costs of enterprises

Active Publication Date: 2022-07-29
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional styrene-butadiene latex flocculation process mostly uses acid flocculant to flocculate styrene-butadiene latex into styrene-butadiene rubber. Because the acid flocculant contains acidity, it is relatively difficult to store, and after flocculation with styrene-butadiene latex, the resulting water solution contains acid. Difficult to handle, causing pollution and increasing processing costs for businesses

Method used

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  • Non-acid flocculation method for styrene-butadiene latex
  • Non-acid flocculation method for styrene-butadiene latex
  • Non-acid flocculation method for styrene-butadiene latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Take 100 parts of styrene-butadiene latex with model 1502 and add it to 0.4 part of coupling agent KH690, heat to 55°C, stir evenly at a speed of 900 rpm, and stir for 3 hours to form the 1502 styrene-butadiene latex after coupling, Add the styrene-butadiene latex of 1502 after coupling into the prepared silicate flocculant solution, and continuously stir at a rotating speed of 900 to 1200 rpm, so that the styrene-butadiene latex of 1502 and the silicate flocculant solution are demulsified and glued. Particle agglomeration and coagulation achieve solid-liquid separation, and after stirring for 4 minutes, the flocculation of 1502 styrene-butadiene latex is completed, and the finished 1502 styrene-butadiene rubber and aqueous solution are obtained. By drying the flocculated finished product 1502 styrene-butadiene rubber on a fluidized bed, the styrene-butadiene rubber with a moisture content of 0.5% is obtained, and then kneading on an internal mixer, and adding 2 parts of ...

Embodiment 2

[0044] Take 100 parts of styrene-butadiene rubber flocculated with an acid flocculant of type 1502 and then knead it on an internal mixer, at the same time add 2 parts of stearic acid; 2.5 parts of antioxidant; 4 parts of zinc oxide; 5 parts of rubber oil vulcanization system mixture , the three groups of properties tested after vulcanization are shown in Table 1 below.

[0045]

[0046] Table 1: Comparison table of test performance after vulcanization

[0047] By comparing the test performance of 1502 finished styrene-butadiene latex and 1502 styrene-butadiene latex after vulcanization, the tensile strength of 1502 styrene-butadiene latex is increased by about 17%, the elongation at break is increased by about 5.3%, and the 100% constant elongation is increased by about 13%. The 300% constant elongation increased by about 12%, and the tear strength increased by about 7.4%.

[0048] In the present invention, silicate is selected as the flocculant, which does not generate a...

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Abstract

The invention discloses a styrene-butadiene latex non-acid flocculation method. The non-acid flocculation method for the styrene-butadiene latex comprises the following steps: (1) developing a green and environment-friendly silicate flocculant solution, wherein the silicate flocculant solution involved in the method needs to be carried out in an acid environment with the pH value of 5-6; and (2) developing a non-acid flocculation process method for the styrene-butadiene latex with the model number of 1502, namely demulsifying the styrene-butadiene latex with the model number of 1502, gathering colloidal particles, and coagulating to achieve solid-liquid separation to form the styrene-butadiene latex with the model number of 1502, so that the problem that the styrene-butadiene latex with the model number of 1502 is flocculated by using an acid flocculant traditionally is solved, the generation of polluted wastewater is avoided, and the environment is protected. The environment-friendly non-acid flocculant is developed, the flocculation process is simple, the butadiene-styrene rubber with the model number of 1502 prepared through the flocculation process is excellent in performance, and the tensile strength, the tearing strength, the fixed length and the elongation at break are superior to those of butadiene-styrene rubber prepared through flocculation of a traditional acid flocculant.

Description

technical field [0001] The invention relates to the technical field of green environmental protection flocculation, in particular to a non-acid flocculation method for styrene-butadiene latex. Background technique [0002] In recent years, with the high wear resistance, high heat resistance and aging resistance of styrene-butadiene rubber than natural rubber, and compared with natural rubber, the price advantage is obvious, so styrene-butadiene latex has replaced some natural rubber and has become a tire enterprise or rubber product enterprise. development trend. The preparation of styrene-butadiene rubber from styrene-butadiene latex generally adopts the flocculation process, which is simple in process and convenient in operation. The traditional styrene-butadiene latex flocculation process mostly uses an acid flocculant to flocculate the styrene-butadiene latex into styrene-butadiene rubber. Since the acid flocculant contains acid, it is relatively difficult to store, and...

Claims

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Application Information

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IPC IPC(8): C08C1/15C08C19/25C08L9/06C08L91/00C08K5/09C08K3/22
CPCC08C1/15C08C19/25C08L9/06C08K2003/2296C08L91/00C08K5/09C08K3/22Y02T10/86
Inventor 林广义李勇井源张苏刘扶民梁振宁刘虹刘彦昌赵瑞青张玉亮万金申
Owner QINGDAO UNIV OF SCI & TECH
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