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Organic silicone modified polyurethane/epoxy/acrylate composite emulsion and preparation method thereof

A technology of acrylate and composite emulsion, applied in the direction of coating, etc., can solve the problems of poor modification effect of epoxy addition, incomplete ring opening of epoxy groups, and reduced emulsion stability, and achieve excellent centrifugal stability , Excellent weather resistance, and the effect of improving water resistance

Active Publication Date: 2017-07-11
山东新而奇新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods are likely to cause incomplete ring opening of epoxy groups during the reaction process. Adding salt-forming agent triethylamine and chain extender ethylenediamine during the synthesis of polyurethane will continue to cause crosslinking and eventually cause emulsion instability. , poor storage performance
Or in order to prepare a stable emulsion, the amount of epoxy added is too small to make the modification effect not good
In order to solve the problem that the addition of epoxy causes the stability of the emulsion to decrease, the present invention proposes to first use an excess of primary amines with high activity to completely open the epoxy ring, and then add it to the reaction system of polyurethane to avoid ring-opening due to epoxy The problem of emulsion instability caused by incompleteness and increased the maximum amount of epoxy resin added

Method used

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  • Organic silicone modified polyurethane/epoxy/acrylate composite emulsion and preparation method thereof
  • Organic silicone modified polyurethane/epoxy/acrylate composite emulsion and preparation method thereof
  • Organic silicone modified polyurethane/epoxy/acrylate composite emulsion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Prepare organosilicon-modified polyurethane / epoxy / acrylate composite emulsion, the method is as follows:

[0034] In the first step, add 50mL of epoxy resin diluted with butanol (E51) into a 250mL three-necked flask with stirring and heating functions, where the volume ratio of epoxy resin:butanol=1:3, and the epoxy Add 2.52g of ethylenediamine (EDA) at a time and stir at a medium speed for 1.5h at a molar ratio of the epoxy group in the resin to the amino group in ethylenediamine at a ratio of 1:3. ) after heating up to 70° C., removing excess ethylenediamine and solvent under vacuum conditions of 2-5 KPa to prepare an amino-terminated epoxy oligomer for future use.

[0035] In the second step, 6.23g of toluene diisocyanate (TDI) was added in a three-necked flask with stirring and heating functions under the protection of nitrogen, and the temperature was raised to 75°C, and 20.00g of polypropylene glycol 2000 (PPG) was added dropwise. After reacting for 0.5h, Gradual...

Embodiment 2

[0038] Adopt the method similar to embodiment 1 to prepare organosilicon modified polyurethane / epoxy / acrylate composite emulsion, difference is:

[0039] The first step: replace epoxy E51 in Example 1 with epoxy F51, and other conditions are the same as Example 1

[0040] Second step: replace toluene diisocyanate (TDI) in embodiment 1 with isophorone diisocyanate (IPDI), replace polypropylene glycol 2000 (PPG) in embodiment 1 with polytetrahydrofuran (PTHF), add organic silicon When γ-aminopropyltriethoxysilane (KH550) and the above-mentioned amino-terminated epoxy prepolymer, add 1.52g 1.4 butanediol (BDO), add 0.2g sodium dodecylsulfonate when emulsifying polyurethane , other conditions are with embodiment 1.

Embodiment 3

[0042] Prepare organosilicon-modified polyurethane / epoxy / acrylate composite emulsion, the method is as follows:

[0043] The first step: replace epoxy E51 in example 1 with epoxy E44, drop 0.4g triethylamine while adding ethylenediamine, other conditions are the same as example 1.

[0044] The second step: use KH560 to replace the organic silicon KH550 in the example, increase the amount of DMPA to 1.55g, add 5mL of acetone to reduce the viscosity when adding acrylic acid monomer, use ice water instead of deionized water at room temperature, and other conditions are the same as in Example 2 .

[0045] The third step: place the silicone-modified polyurethane / epoxy / acrylate composite emulsion obtained in the third step in a vacuum drying oven at 80° C., and dry for 5-8 hours to remove the acetone added before. Other conditions are the same as in Example 1.

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Abstract

The invention relates to an organic silicone modified polyurethane / epoxy / acrylate composite emulsion and a preparation method thereof. The preparation method comprises three steps: a first step, synthesizing a low-molecular-weight epoxy prepolymer; a second step, preparing an organic silicone modified polyurethane, introducing the epoxy prepolymer into a polyurethane system, and terminating with hydroxyl, to prepare a polyurethane / epoxy composite prepolymer; and a third step, adding the prepolymer into an acrylate reaction system under a condition without addition of an emulsifier, carrying out a reaction with acrylic acid monomers under the action of an initiator, and thus preparing the organic silicone modified polyurethane / epoxy / acrylate composite emulsion. The prepared composite emulsion has excellent centrifugal stability, freeze-thaw stability and static stability; after film coating, the appearance is bright, clean and smooth, no bubbles and cracks exist, the tensile strength reaches 7-15 MPa, the elongation at break reaches 400-600%, a coating film has excellent weather resistance, the lowest decomposition temperature is 180 DEG C or more, and the surface contact angle is 70-95 DEG.

Description

technical field [0001] The invention belongs to the technical field of coatings, and relates to a silicone-modified polyurethane / epoxy / acrylate composite emulsion and a preparation method thereof. Background technique [0002] Waterborne polyurethane coatings not only have the characteristics of non-toxic, non-polluting, and non-combustible, but also have the characteristics of wear resistance, strong flexibility, and strong adhesion. With the improvement of people's health awareness and the successive introduction of the government's restrictions on volatile organic solvents (VOC), the demand for water-based environmentally friendly coatings is increasing year by year, and it has become an inevitable trend for water-based coatings to replace solvent-based coatings on a large scale. As far as water-based polyurethane is concerned, most of the water-based polyurethanes on the market are single-component water-based polyurethanes, and their application ranges are mostly concen...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/18C08F220/14C08G18/08C08G18/28C08G18/32C08G18/34C08G18/40C08G18/48C08G18/58C08G18/66C08G18/67C09D151/08
CPCC08F283/008C08G18/0823C08G18/289C08G18/3228C08G18/348C08G18/4045C08G18/4833C08G18/4854C08G18/58C08G18/6659C08G18/672C09D151/08C08G18/6692C08F220/1804
Inventor 翁睿穆正杰王文波徐可
Owner 山东新而奇新材料有限公司
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