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Polystyrene seed emulsion and preparation method thereof

A technology of polystyrene and seeds, applied in the field of polystyrene seed emulsion and its preparation, to achieve the effects of easy availability of raw materials, high conversion rate of monomers, and low cost

Pending Publication Date: 2022-02-08
广东天银实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their research did not involve changes in polymerization rate and particle size, polymerization temperature and addition system. Liu Baijun and others paid more attention to the particle agglomeration of the initiator system in emulsion polymerization

Method used

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  • Polystyrene seed emulsion and preparation method thereof
  • Polystyrene seed emulsion and preparation method thereof
  • Polystyrene seed emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Materials: commercially available styrene monomer, Fluka's reagent grade potassium persulfate initiator, industrial grade BASF SLS103 (sodium dodecyl sulfate) emulsifier (30%), reagent grade Sigma Aldrich's t-DDM (tert-dodecyl sulfate) alkanethiol), reagent grade sodium bicarbonate, SigmaAldrich, distilled water as the polymerization medium.

[0038] First, according to the seed emulsion formula in Table 1, each mixture was prepared for emulsion polymerization. The first step was to replace the oxygen in the reactor with nitrogen, add the advanced mixture and the modified mixture to the reactor, and heat it to 85°C; when the temperature reached 85°C At 0C, the starter mix and monomer mixture were added simultaneously, polymerization began, the temperature would rise to 90C for about 5 minutes, and the reactor was immediately cooled to 80C and held for 5 hours.

[0039] Table 1 Recipe of seed emulsion

[0040]

[0041]

Embodiment 2

[0043] The preparation method is the same as that in Example 1. The polymerization is based on the seed latex formulation in Table 1. The dosage of the initiator potassium persulfate is 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45% and 0.50% respectively. The weight percentage of the monomer was added, the amount of potassium persulfate of the initiator was changed, and the influence of the monomer conversion rate and particle size of the initiator was observed. The solid content of latex at 105°C was determined by gravimetric method, and the conversion rate of monomer was calculated. The test results are as follows figure 1 shown. Use a particle size analyzer (Melvin particle size analyzer) to analyze the particle size, dilute the latex emulsion with a certain amount of water to obtain the concentration to be tested, and the test results are as follows figure 2 shown.

[0044] In other embodiments, ammonium persulfate and sodium persulfate can also be used as init...

Embodiment 3

[0048] The preparation method is the same as in Example 1, and the polymerization is based on the seed latex formula of Table 1, and the consumption of the initiator potassium persulfate is added by 0.20% monomer weight percentage, and the addition of the initiator in the reactor is controlled by the peristaltic metering pump, and the addition time is respectively 0 , 5, 10, 15, 20, 25, 30 minutes. The solid content of latex at 105°C was measured by gravimetric method, and the conversion rate of monomer was calculated. The influence of the addition time of initiator potassium persulfate on the conversion rate of monomer is as follows image 3 shown. Analyze the particle size with a particle size analyzer (Melvin particle size analyzer), dilute the latex emulsion with a certain amount of water to obtain the concentration to be tested, and the effect of the addition time of the initiator potassium persulfate on the particle size is shown in 4.

[0049] image 3Show that the hi...

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Abstract

The invention relates to a polystyrene seed emulsion, which is prepared from the following raw materials in parts by weight: 500-600 parts of a styrene monomer, 4-10 parts of t-DDM, 0.5-1 part of sodium bicarbonate, 200-220 parts of Disponil SLS103, 1-2 parts of potassium persulfate and 1200-1300 parts of water. The invention also provides a preparation method of the polystyrene seed emulsion. The operation steps are simple, the raw materials are easy to obtain, the cost is low, and the polystyrene seed emulsion with high monomer conversion rate and small particle size can be obtained through the method. It is found that the time for adding an initiator into an emulsion system plays an important role in monomer conversion rate and particle size distribution.

Description

technical field [0001] The invention belongs to the technical field of polymer polystyrene seed emulsion polymerization, and more particularly relates to a polystyrene seed emulsion and a preparation method thereof. Background technique [0002] Emulsion polymerization has the characteristics of easy heat dissipation, fast polymerization rate and high system stability, and has been widely used in industrial production. Emulsion polymerization is a heterogeneous process for producing polymers, usually carried out using water as the dispersion medium. The process involves multiple ingredients, including the hydrophobic phase (monomer) emulsified by an oil-in-water emulsifier (surfactant), followed by a water-soluble initiator (such as potassium persulfate) or an oil-soluble initiator (such as 2,2 - azoisobutyronitrile) to initiate the polymerization. The initiator decomposes into free radicals through thermal decomposition and redox reactions, a typical emulsion polymerizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/08C08F2/38C08F2/26
CPCC08F112/08C08F2/38C08F2/26
Inventor 张煜璇黄浩锋陈晓婷蔡镇源林濠生
Owner 广东天银实业有限公司
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