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Preparation method for macromonomer modified nanometer silica aqueous silica sol and light-cured aqueous polyurethane nanometer composite emulsion of same

A nano-silica, macromonomer technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of lack of interaction, the mechanical properties of the coating surface are not significantly improved, agglomeration, etc., and the process is simple. , the reaction is easy to control, the effect of improving the mechanical properties

Active Publication Date: 2012-02-01
HAIMEN MAOFA ART DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Colloid Polymer Science" (Colloid Polym Sci 2006, 284, 1067) introduces the physical blending of water-based silica sol and photocurable water-based polyurethane acrylate dispersion to improve the mechanical properties of the coating surface such as hardness, etc., but due to It is just a simple physical blending of nano-silica sol and water-based urethane acrylate system. The lack of sufficient interaction between inorganic nano-silica and organic urethane acrylate will easily cause nano-silica to agglomerate, so that the coating The improvement of the surface mechanical properties of the layer is not very significant

Method used

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  • Preparation method for macromonomer modified nanometer silica aqueous silica sol and light-cured aqueous polyurethane nanometer composite emulsion of same
  • Preparation method for macromonomer modified nanometer silica aqueous silica sol and light-cured aqueous polyurethane nanometer composite emulsion of same
  • Preparation method for macromonomer modified nanometer silica aqueous silica sol and light-cured aqueous polyurethane nanometer composite emulsion of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 This example is a comparative example for the preparation of photocurable water-based polyurethane emulsion and latex film without silica sol modification.

[0023] Add 24.5g isophorone diisocyanate (IPDI) and four drops of dibutyltin dilaurate (DBTDL) catalyst in 250mL four-necked bottle, add 31.5g polyethylene glycol (PEG400) in dropping funnel and dropwise, Control the temperature at 40-50°C, react for 1-1.5 hours, measure the NCO content with the di-n-butylamine method, add 2.85g dimethylol butyric acid (DMPA) when the NCO content is close to the theoretical value, and the reaction temperature is 60-70 ℃, react for 2-3 hours, when the NCO content is close to the theoretical value, add 2.6g hydroxyethyl acrylate (HEA) (containing 0.1g polymerization inhibitor) dropwise and raise the temperature to 70℃, react for 3-4 hours, and take samples Infrared detection, observe the characteristic peak of NCO group at 2270cm -1 , until it disappears completely to obta...

Embodiment 2

[0024] Example 2 This example is a comparison example for the preparation of photocurable water-based polyurethane composite emulsion and composite latex film without silica sol modification

[0025] Add 24.5g isophorone diisocyanate (IPDI) and four drops of dibutyltin dilaurate (DBTDL) catalyst in 250mL four-necked bottle, add 31.5g polyethylene glycol (PEG400) in dropping funnel and dropwise, Control the temperature at 40-50°C, react for 1-1.5 hours, measure the NCO content with the di-n-butylamine method, add 2.85g dimethylol butyric acid (DMPA) when the NCO content is close to the theoretical value, and the reaction temperature is 60-70 ℃, react for 2-3 hours, when the NCO content is close to the theoretical value, add 2.6g hydroxyethyl acrylate (HEA) (containing 0.1g polymerization inhibitor) dropwise and raise the temperature to 70℃, react for 3-4 hours, and take samples Infrared detection, observe the characteristic peak of NCO group at 2270cm -1, until it disappears c...

Embodiment 3

[0026] Example 3 Synthesis of macromer-modified nano-silica hydrosilica sol and light-cured water-based polyurethane nanocomposite emulsion

[0027] (1) Macromer modified nano-silica hydrosilica sol

[0028] Take an appropriate amount of silica sol, put it into a 100mL three-necked bottle, add modified macromer PEGM1 or PEGM2 or PEG according to 5% of the mass of the silica sol, and stir for 24 hours at 25°C. Hydrogen bonding is formed between the monomers,

[0029] (2) Synthesis of photocurable waterborne polyurethane nanocomposite emulsion

[0030] Add 24.5g isophorone diisocyanate (IPDI) and four drops of dibutyltin dilaurate (DBTDL) catalyst in 250mL four-necked bottle, add 31.5g polyethylene glycol (PEG400) in dropping funnel and dropwise, Control the temperature at 40-50°C, react for 1-1.5 hours, measure the NCO content with the di-n-butylamine method, add 2.85g dimethylol butyric acid (DMPA) when the NCO content is close to the theoretical value, and the reaction temp...

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Abstract

The invention relates to a preparation method for macromonomer modified nanometer silica aqueous silica sol and light-cured aqueous polyurethane nanometer composite emulsion. According to the invention, since there are a great amount of silanol groups on the surface of unmodified nanometer silica, water-soluble polyethylene glycol acrylate macromonomers are employed and enabled to adhere to the surface of aqueous nanometer silica through hydrogen bonding, and the macromonomer modified nanometer silica aqueous silica sol is formed; the macromonomer modified nanometer silica aqueous silica sol is introduced in situ during the preparation process for light-cured aqueous polyurethane emulsion so as to prepare the light-cured aqueous polyurethane nanometer composite emulsion. The nanometer composite emulsion prepared by the method has good dispersion stability; simultaneously, nanometer silica has very good dispersibility in a polyurethane membrane; introduction of inorganic nanometer silica enables mechanical properties of a light-cured coating to be obviously improved. Obtained dispersion in the invention can be extensively applied in the field of surface coatings for high damage resistant and wear resistant woodenwares, metals, plastics, etc.

Description

technical field [0001] The invention relates to a novel organic-inorganic nanometer composite emulsion, and mainly relates to a green and environment-friendly preparation method of ultraviolet light-curable water-based polyurethane nanometer composite emulsion. It belongs to the field of new material technology. Background technique [0002] In recent years, UV-curable waterborne polyurethane emulsion (WPU) has the advantages of good comprehensive performance, high efficiency, energy saving, environmental protection, safety and hygiene, and has been well applied in the fields of coatings and adhesives. However, the mechanical properties (strength, modulus) of photo-crosslinked latex films are still not comparable to those of traditional cross-linked polyurethanes, thus limiting the wide application of the coating film. In addition, the light-cured waterborne polyurethane coating is easily damaged by abrasion during use, thus limiting its further application. Therefore, in p...

Claims

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Application Information

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IPC IPC(8): C08G18/72C08G18/67C08G18/66C08G18/48C08G18/34C08G18/10C08K9/06C08K3/36C08J3/03C09D175/16C09D175/08C09D7/12
Inventor 张胜文于爱霞张燕刘仁江金强刘晓亚
Owner HAIMEN MAOFA ART DESIGN CO LTD
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