Method for Synthesizing Polysiloxane Miniemulsion Using Microlatex Seeds under Single Emulsifier

A technology of microlatex seeds and polysiloxane is applied in polysiloxane miniemulsion and application fields, and can solve problems such as complicated corresponding processes, and achieve the effects of simplifying process steps, saving production costs and narrowing distribution.

Active Publication Date: 2017-08-25
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 Using Microlatex Seeds under Single Emulsifier
  • Method for Synthesizing Polysiloxane Miniemulsion Using Microlatex Seeds under Single Emulsifier
  • Method for Synthesizing Polysiloxane Miniemulsion Using Microlatex Seeds under Single Emulsifier

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 polysiloxane emulsion preparation, and discloses a method for synthesizing polysiloxane microemulsion by using microlatex seeds under a single emulsifier, as well as polysiloxane microemulsion and application thereof. The method comprises the following specific steps: dissolving the emulsifier in water, adding organosilicon monomer, mechanically stirring for pre-emulsification, adding strong base catalyst after heating, and stirring at constant temperature to obtain organosiloxane microlatex seed emulsion; The organosilicon monomer is added dropwise to the organosiloxane microlatex seed emulsion semi-intermittently, and after the dropwise addition is completed, the reaction is continued with stirring at a constant temperature, cooled, and neutralized to obtain a polysiloxane microemulsion. The invention uses long-chain alkyl dipolyoxyethylene quaternary ammonium salt as a single cationic emulsifier, uses polysiloxane microlatex as a seed, adds the same monomer in a semi-batch method, and synthesizes the particle size without other means of homogenization Small polysiloxane microemulsion with narrow distribution and good stability can be widely used in the fields of textiles, coatings and daily chemical products.

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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Patent Type & Authority Patents(China)
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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