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Polymer emulsion and preparation method thereof

A polymer emulsion and polymer solution technology, applied in the field of polymer emulsion, can solve the problems of poor product stability and emulsification effect, achieve excellent performance, avoid demulsification, and avoid adverse effects

Active Publication Date: 2021-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of polymer emulsion and its preparation method in order to overcome the problem that the existing method for preparing polymer emulsion has poor emulsification effect on higher viscosity polymers, resulting in poor product stability.

Method used

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  • Polymer emulsion and preparation method thereof
  • Polymer emulsion and preparation method thereof

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preparation example Construction

[0016] According to a first aspect of the present invention, the present invention provides a method for preparing a polymer emulsion, the method comprising an emulsification step and at least one emulsion separation step,

[0017] In the emulsification step, the polymer solution containing the polymer and the organic solvent is mixed with the aqueous solution containing the emulsifier, and the obtained mixed solution is emulsified to obtain an emulsion;

[0018] The step of separating and concentrating the emulsion includes successive organic solvent removal sub-steps and centrifugation sub-steps. In the organic solvent removal sub-step, the emulsion is subjected to at least one distillation to remove part of the organic solvent in the emulsion. solvent to obtain a dilute emulsion, and in the centrifugal separation sub-step, the dilute emulsion is subjected to at least one centrifugation;

[0019] The emulsifier is an anionic emulsifier, and the polymer is a polymer formed by...

preparation example 1

[0098] In this preparation example, all reagents and reactors were used after anhydrous and oxygen-free treatment.

[0099] Mix 3.6mL of neodecanoate n-hexane solution with a concentration of 0.5mol / L, 43mL of triisobutylaluminum n-hexane solution with a concentration of 0.5mol / L, and 11mL of diethylaluminum chloride with a concentration of 0.5mol / L in n-hexane Alkane solution and 242mL of n-hexane were mixed to prepare a catalyst solution C1 with a concentration of 6mmol / l for later use. Isoprene solution polymerization was performed using the prepared catalyst solution C1. Under the protection of nitrogen, 5.2 mol of isoprene (IP), n-hexane and catalyst solution C1 were successively added to the reactor, and the catalyst dosage was 0.12 mmol Nd / mol IP. After reacting at 30° C. for 40 minutes, a methanol solution of 2,6-di-tert-butylhydroquinone was added to terminate the reaction. A glue solution Y1 with a concentration of 16 wt% was obtained.

[0100] After measurement, ...

preparation example 2

[0102] Under nitrogen protection, 10mol isoprene, 8.2L n-hexane and 5.3mL butyllithium n-hexane solution with a concentration of 0.1mol / L were successively added to the reactor, and the molar ratio of butyllithium to isoprene was 5.3×10 -5 . After reacting at 40° C. for 70 minutes, the reaction was terminated. A glue solution Y2 with a concentration of 11 wt% was obtained.

[0103] After measurement, the cis 1,4-structure content of polyisoprene is 81% by weight, the weight average molecular weight is 1.3 million, and the molecular weight distribution is 1.3. The apparent viscosity of the diene solution is 16800cP.

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Abstract

The invention relates to a polymer emulsion, and discloses a polymer emulsion and a preparation method thereof. The method includes an emulsification step and at least one step of separating and concentrating the emulsion, combining a polymer solution containing a polymer and an organic solvent with an aqueous solution containing an emulsifier Mixing and emulsifying the mixed solution; the step of separating and concentrating the emulsion includes successive organic solvent removal sub-steps and centrifugal separation sub-steps, the emulsion is subjected to at least one distillation, and the thin emulsion is subjected to at least one centrifugation; the emulsifier is an anion Type emulsifier, the polymer is a polymer formed by homopolymerization and / or copolymerization of dienes or a polymer formed by copolymerization of dienes and C2-C4 alkenyl-substituted aromatic compounds, measured according to HG / T3323-2008 The apparent viscosity of the polymer solution at a concentration of 6-20% by weight at 25°C is 5000-20,000 cP. The method obtains a polymer emulsion with high polymer content, and the product has good stability.

Description

technical field [0001] The invention relates to a method for preparing a polymer emulsion, in particular to a method for preparing a polymer emulsion and a polymer emulsion prepared by the method. Background technique [0002] Synthetic polymer emulsions can be used to manufacture adhesives, paints, coatings, fabrics, etc., and are widely used in various fields related to daily life such as construction, papermaking, leather, medical and health care, etc. Compared with natural latex, the production of synthetic polymer emulsion is more flexible and controllable, and the product grades are more abundant, which can meet the needs of different fields and products. [0003] CN100369938C discloses an emulsion polymer and the formation of a first emulsion polymer by free radical polymerization of at least one first ethylenically unsaturated monomer, and subsequent use of a colloid stabilizer, at least one second ethylenically unsaturated Process for preparing the emulsion polymer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/07C08L9/00
Inventor 谭金枚张杰王超贺小进申翠萍辛益双徐林董江舟
Owner CHINA PETROLEUM & CHEM CORP
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