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Method for synthesizing polysiloxane miniemulsion by utilizing microlatex seeds under single emulgator

A technology of microlatex seeds and polysiloxane, which is applied in polysiloxane microemulsions and application fields, can solve problems such as cumbersome corresponding processes, and achieve the effects of simplifying process steps, reducing production costs, and simplifying post-processing procedures

Active Publication Date: 2015-07-01
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the compounding of various additives and the preparation of pre-emulsion, and the corresponding process becomes cumbersome

Method used

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  • Method for synthesizing polysiloxane miniemulsion by utilizing microlatex seeds under single emulgator
  • Method for synthesizing polysiloxane miniemulsion by utilizing microlatex seeds under single emulgator
  • Method for synthesizing polysiloxane miniemulsion by utilizing microlatex seeds under single emulgator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Take 2.4 g of octadecyldipolyoxyethylene benzyl ammonium chloride (oxyethylene group x+y=15 in the structure), add 67.6 g of deionized water, stir mechanically until it is completely dissolved, add 3 g of octamethyl Cyclotetrasiloxane (D 4 ), make it mix evenly by stirring, then carry out pre-emulsification by 600r / min mechanical shearing homogeneous 25min, add 1.25g mass fraction after emulsification is 40% potassium hydroxide solution, under the condition of 450r / min at the rotating speed, heat up to 70°C and react for 20 minutes to prepare polysiloxane microlatex seeds.

[0044](2) Add 27g D dropwise at 0.225g / min to the polysiloxane microlatex seeds of the above (1). 4 , keep the rotational speed at 450r / min and the reaction temperature at 70°C, continue the reaction for 1h after the dropwise addition, and neutralize with acid to pH=7 after cooling to obtain polysiloxane miniemulsion.

[0045] (3) The particle size of the miniemulsion measured by the dynamic l...

Embodiment 2

[0047] (1) Take 3.6 g of dodecyl bispolyoxyethylene benzyl ammonium bromide (oxyethylene group x+y=15 in the structure), add 101.4 g of deionized water, stir mechanically until it is completely dissolved, add 4 g of octamethyl Cyclotetrasiloxane (D 4 ), then carry out pre-emulsification by 1000r / min mechanical shear homogenization for 10min, after the emulsification is completed, add 1.875g mass fraction of 40% sodium hydroxide solution, under the condition of 500r / min, heat up to 80°C, react for 30min, The polysiloxane microlatex seeds were prepared.

[0048] (2) Add 36g D dropwise at 0.45g / min to the polysiloxane microlatex seeds 4 , keep the rotational speed at 500r / min and the reaction temperature at 80°C, continue the reaction for 2h after the dropwise addition, and neutralize with acid to pH=7 after cooling to obtain polysiloxane miniemulsion.

[0049] (3) The particle size of the miniemulsion measured by the dynamic light scattering method is 77.52nm (Z-Average), and ...

Embodiment 3

[0051] (1) Take 4.8 g of octadecyldipolyoxyethylene benzyl ammonium chloride (oxyethylene group x+y=15 in the structure) and add 135.2 g of deionized water, stir mechanically until it dissolves completely, add 6 g of octamethyl Cyclotetrasiloxane (D 4 ), make it mix uniformly by stirring, then carry out pre-emulsification by 1200r / min mechanical shearing homogeneous 20min, add 3g mass fraction after emulsification and be 20% potassium hydroxide solution, under the condition of 350r / min, be warming up to React at 85°C for 20 minutes to prepare polysiloxane microlatex seeds.

[0052] (2) Add 54g D dropwise at 0.9g / min to the above polysiloxane microlatex seeds 4 , keep the rotational speed at 350r / min and the reaction temperature at 85°C, continue the reaction for 4h after the dropwise addition, and neutralize with acid to pH=7 after cooling to obtain polysiloxane miniemulsion.

[0053] (3) The particle size of the miniemulsion measured by the dynamic light scattering method i...

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Abstract

The invention belongs to the technical field of preparation of polysiloxane emulsion, and discloses a method for synthesizing polysiloxane miniemulsion by utilizing microlatex seeds under a single emulgator as well as the polysiloxane miniemulsion and application of the polysiloxane miniemulsion. The method comprises the following specific steps of dissolving the emulgator in water, adding an organosilicone monomer, mixing mechanically for pre-emulsification, adding a super basic catalyst after heating, and mixing at a constant temperature to obtain the organic siloxane microlatex seed emulsion; dropwise adding the organosilicone monomer in the organic siloxane microlatex seed emulsion semi-intermittently while mixing at the constant temperature, mixing continuously at the constant temperature for reaction after the dropwise adding, cooling, and neutralizing to obtain the polysiloxane miniemulsion. According to the method, long-chain alkyl-di-polyoxyethylene quaternary ammonium salt is used as the single cationic emulsifier, the polysiloxane microlatex is used as seeds, the same monomer is added semi-intermittently, the polysiloxane miniemulsion which is small in grain size, narrow in distribution and good in stability is prepared without relying on other homogenizing means, and the polysiloxane miniemulsion can be widely applied to the fields of textiles, coatings and household chemicals.

Description

technical field [0001] The invention belongs to the technical field of polysiloxane emulsion preparation, and in particular relates to a method for synthesizing polysiloxane miniemulsion with microlatex seeds under a single emulsifier, polysiloxane microemulsion and application thereof. Background technique [0002] The chemical structure of polysiloxane is -Si-O- composed of Si and O inorganic elements as the main chain, -CH 3 Such organic groups are used as side groups. This chemical structure makes polysiloxane have the properties of both organic and inorganic polymers, such as high and low temperature resistance, high elasticity, air permeability, mold release and low surface tension, so that Polysiloxane is widely used in the fields of textile, rubber, construction, electronic appliances and cosmetics. Based on considerations of environmental friendliness and economical production, emulsion-type polysiloxane occupies most of the current market. [0003] There are two ...

Claims

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Application Information

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IPC IPC(8): C08G77/06C08G77/04
Inventor 沈敏敏王俊凤哈成勇翟俊菱
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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