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Polymer latex agglomerated particles and preparation method thereof

A technology of polymer glue and condensed particles, which is applied in the field of polymer latex condensed particles and its preparation, can solve the problems of low curing molding rate and poor quality of polymer latex condensed particles, and reduce the residue of coagulant and the amount of coagulant and the amount of steam, the effect of reducing the amount of fine powder

Pending Publication Date: 2022-02-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of polymer latex coagulated particle and its preparation method, to solve the problems of low curing rate and poor quality of polymer latex coagulated particle in the prior art

Method used

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  • Polymer latex agglomerated particles and preparation method thereof
  • Polymer latex agglomerated particles and preparation method thereof
  • Polymer latex agglomerated particles and preparation method thereof

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preparation example Construction

[0019] In a typical implementation of the present application, a method for preparing polymer latex aggregated particles is provided, the method comprising: step S1: preparing the first latex with a core-first polymer shell structure; A latex is added with a polymerized monomer to react to obtain a second latex with a core-first polymer shell-second polymer shell structure, wherein the glass transition temperature of the second polymer is higher than the glass transition temperature of the first polymer Lower 5-20°C; step S3: make the second latex coagulate, ripen and then dehydrate to obtain polymer latex coagulated particles.

[0020] In the above method of the present application, the process of preparing the first latex in step S1 and the coagulation and dehydration process after aging in step S3 are well known to those skilled in the art. The first latex prepared in step S1 includes but not limited to ABS grafted latex such as polybutadiene latex grafted with acrylonitril...

Embodiment 1

[0036] (1) Use polybutadiene (PB) latex with a total solid content (TSC) of 57.5 to 58.5% to carry out ABS graft polymerization, the amount of PB latex is 1135kg, and the amount of incremental monomer composed of acrylonitrile and styrene is 440kg , wherein the weight percent of acrylonitrile is 25wt%. The graft polymerization reaction is carried out by adding incremental monomer step by step. First, 110kg incremental monomer and 0.75kg cumene hydroperoxide are added to start the first stage reaction. The temperature of the reactor jacket is set at 50°C. After the reaction was carried out for 60 minutes, the remaining incremental monomer and cumene hydroperoxide were added dropwise for 100 minutes to obtain the first latex with the core-first polymer shell structure. After the completion, the temperature of the jacket was raised to 65° C., and 55 kg of styrene and 0.25 kg of cumene hydroperoxide were added dropwise into the reactor, and the dropwise addition time was 20 minute...

Embodiment 2

[0040] Except that 55kg of styrene is added at one time, the process of embodiment 2 is all the same as embodiment 1.

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Abstract

The invention provides polymer latex agglomerated particles and a preparation method thereof. The method comprises the following steps: S1, preparing first latex with a core-first polymer shell structure; S2, adding a polymeric monomer into the first latex for a reaction, and obtaining second latex of a core-first polymer shell-second polymer shell structure, wherein the glass transition temperature of a second polymer is 5-20 DEG C lower than that of the first polymer; and S3, condensing the second latex, curing, and dehydrating to obtain polymer latex agglomerated particles. By applying the method, on the premise of not changing coagulation conditions, the curing forming rate of polymer particles is increased, the particle size of powder is increased, the micro powder amount in the powder is reduced, and the operation stability of a dehydration and drying system is improved.

Description

technical field [0001] The invention relates to polymer latex aggregated particles, in particular to a polymer latex aggregated particle and a preparation method thereof. Background technique [0002] Core-shell polymers produced by emulsion polymerization are mainly used in coatings and toughening agents. When used as a toughening agent, it is necessary to use the water precipitation coagulation process to recover the polymer in the latex to obtain a certain particle size of the polymer powder. During the coagulation process, the grafted polymer particles collide with each other, and the higher the frequency of collision, the higher the density of the coagulated particles; the larger the collision deformation, the larger the particle size of the coagulated particles. [0003] The production of polymers with core-shell structure is mostly carried out by seed emulsion polymerization. At different stages of the reaction, different monomers are added to obtain the polymers wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F285/00C08F212/08C08F220/18
CPCC08F285/00C08F212/08C08F220/1804
Inventor 孙春福刘姜张辉陆书来于万权宋振彪杨超张东杰闫柏郁
Owner PETROCHINA CO LTD
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