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Preparation method of nanometer silica polyether (ester) polyol dispersion for modifying polyurethane

A nano-silica and polyurethane technology, applied in chemical instruments and methods, dyed organic silicon compound treatment, dyed low-molecular organic compound treatment, etc., to achieve the effects of improving aging resistance, improving flexibility and reducing surface energy

Active Publication Date: 2015-02-11
WUYI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, so far, there have been no reports of a nano-silica monomer dispersion that can be highly uniformly dispersed in the form of primary particles in a monomer medium and can be stored stably for a long time. The nano-silica dispersion prepared by this patent No need to pass through nano-silica powder, avoiding agglomeration between nano-silica particles, nano-silica can be uniformly dispersed in polyether (ester) polyol monomers to form a stable dispersion

Method used

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  • Preparation method of nanometer silica polyether (ester) polyol dispersion for modifying polyurethane
  • Preparation method of nanometer silica polyether (ester) polyol dispersion for modifying polyurethane
  • Preparation method of nanometer silica polyether (ester) polyol dispersion for modifying polyurethane

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Embodiment Construction

[0027] 1. Take 40mL of 3.6mol / L hydrochloric acid, add it to the flask, cool it down to below 10°C with an ice bath, measure 50mL of 1.0mol / L sodium silicate, and drop it into the flask through the dropping funnel for about 30 minutes , then add 5%-30% silane coupling agent A174 of theoretical silica content, react at room temperature for 2 hours, add 35gNaCl and stir for 30min, then add an equal volume of THF, stir for 2h, pour the liquid in the flask into a separatory funnel, Stand still for 30 minutes, pour the upper liquid into a beaker, add 25g of anhydrous sodium sulfate, stir for 10 minutes, seal and dry overnight, then add 35g of polypropylene glycol (1000) according to 15% solid content, ultrasonic for 2 hours, and remove THF under reduced pressure at 60°C to obtain a clear and transparent Silica polypropylene glycol (1000) dispersion.

[0028] 2. Take 32mL of 3.8mol / L hydrochloric acid, add it to the flask, cool it down to below 10°C with an ice bath, measure 100mL o...

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Abstract

The invention provides a preparation method of a nanometer silica polyether (ester) polyol dispersion for modifying polyurethane. The method adopting precipitation and extraction combination comprises the following steps: preparing a nanometer silica dispersion by using alkali metal silicate under acid catalysis or other strong acidic and strong acid weak alkali salt double hydrolysis conditions, carrying out wrapping modification through a coupling agent, adding a corresponding strong acid strong alkali salt until the obtained solution is supersaturated, extracting nanometer silica from the obtained aqueous solution by using a low boiling point solvent, adding polyether (ester) polyol, mixing, and carrying out reduced pressure distillation at 80DEG C under an absolute pressure of below 0.010MPa to remove the low boiling point solvent and obtain the uniform nanometer silica polyether (ester) polyol dispersion. The dispersion can be used as a polyurethane modifier to improve the hardness, the toughness, the compactness, the antifriction property and the like of a film. The preparation method of the nanometer silica dispersion has the advantages of simplicity, cheap and easily available raw materials, low cost, and suitableness for large-scale industrial production.

Description

technical field [0001] This patent relates to a method for preparing a modified polyurethane nano-silica polyether (ester) polyol dispersion. It specifically relates to the preparation of nano silicon dioxide polyether (ester) polyol dispersion. Background technique [0002] Nano silica is an amorphous white powder, which is a non-toxic, odorless and non-polluting non-metallic functional material. nano-SiO 2 It is currently the inorganic nanomaterial with the largest industrial output and the most widely used. The primary particle size is generally between 10nm and 60nm, the relative density is 2.319-2.653, and the melting point is 1750°C. nano-SiO 2 The molecular state is a three-dimensional chain structure, and there are residual bonds and hydroxyl groups in different bonding states on the surface, and it deviates from the stable silicon-oxygen structure due to oxygen deficiency, so nano-SiO 2 The molecular formula can be expressed as SiO 2-x (x0.4~0.8). nano-SiO 2 ...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/42C08G18/32C08K9/04C08K9/06C08K3/36C09C1/28C09C3/08C09C3/12
CPCC08G18/4238C08G18/48C08G18/4833C08G18/4854C08K3/36C08K9/04C08K9/06C09C1/28C09C3/006
Inventor 陈永军卿宁候发秋
Owner WUYI UNIV
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