Modified waterborne polyurethane latex film and preparation method thereof

A water-based polyurethane and latex film technology, applied in chemical instruments and methods, coatings, layered products, etc., can solve problems such as only cashmere knitted fabrics, unable to obtain water-repellent products, and limited product water repellency, etc. Improve hydrophobic performance, strengthen negative ion release performance, and simple preparation method

Active Publication Date: 2016-08-31
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the product and its synthesis method have shortcomings. First, the water repellency of the product has a limited improvement, only 73.5 degrees, and the range of use is limited, and it can only be used for cashmere knitted fabrics; secondly, the synthesis method Products with higher water repellency cannot be obtained

Method used

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  • Modified waterborne polyurethane latex film and preparation method thereof
  • Modified waterborne polyurethane latex film and preparation method thereof
  • Modified waterborne polyurethane latex film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The concrete steps of preparation are:

[0037] Step 1, first casting the water-based polyurethane emulsion on the substrate, and drying it at 40°C to form a film; wherein, the substrate is flat glass to obtain a water-based polyurethane emulsion film. Then dissolve polyvinylidene fluoride into the solvent to prepare a polyvinylidene fluoride solution with a solid content of 8% as a spraying liquid; wherein, the solvent is N,N-dimethylformamide (or tetrahydrofuran, or two mixture of species).

[0038] Step 2, first spray the spray liquid onto the water-based polyurethane latex film, and dry it at room temperature for 5 hours; wherein, the pressure during spraying is 2×10 5 Pa, an intermediate product was obtained. Then the intermediate product was dried at 60°C to form a film, and a product similar to figure 1 and Figure 5 shown, and as Figure 6 The modified waterborne polyurethane latex films are shown in the data.

Embodiment 2

[0040] The concrete steps of preparation are:

[0041] Step 1, first cast the water-based polyurethane emulsion on the substrate, and dry it at 50°C to form a film; wherein, the substrate is flat glass to obtain a water-based polyurethane emulsion film. Then dissolve the polytetrafluoroethylene into the solvent to prepare a polyvinylidene fluoride solution with a solid content of 9% as a spraying liquid; wherein, the solvent is N,N-dimethylformamide (or tetrahydrofuran, or two mixture of species).

[0042] Step 2, first spray the spray liquid onto the water-based polyurethane latex film, and dry it at room temperature for 5.5 hours; wherein, the pressure during spraying is 2.3×10 5 Pa, an intermediate product was obtained. Then the intermediate product was dried at 65°C to form a film, and a product similar to figure 1 and Figure 5 shown, and as Figure 6 The modified waterborne polyurethane latex films are shown in the data.

Embodiment 3

[0044] The concrete steps of preparation are:

[0045] Step 1, first cast the water-based polyurethane emulsion on the substrate, and dry it at 60°C to form a film; wherein, the substrate is flat glass to obtain a water-based polyurethane emulsion film. Then dissolve polyvinylidene fluoride into the solvent to prepare a polyvinylidene fluoride solution with a solid content of 10% as a spraying liquid; wherein, the solvent is N,N-dimethylformamide (or tetrahydrofuran, or two mixture of species).

[0046] Step 2, first spray the spray liquid onto the water-based polyurethane latex film, and dry it at room temperature for 6 hours; wherein, the pressure during spraying is 2.5×10 5 Pa, an intermediate product was obtained. Then the intermediate product was dried at 70°C to form a film, and the following figure 1 and Figure 5 shown, and as Figure 6 The modified waterborne polyurethane latex films are shown in the data.

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Abstract

The invention discloses a modified waterborne polyurethane latex film and a preparation method thereof. The waterborne polyurethane latex film is covers a composite layer and is a polyviny-tetrafluoroethylene micro-sphere or a mixture of the polyviny-tetrafluoroethylene micro-sphere and polyurethane or a mixture of tourmaline powder and polyviny-tetrafluoroethylene or a mixture of the tourmaline powder, the polyviny-tetrafluoroethylene and the polyurethane. The method comprises the steps of casting waterborne polyurethane latex on a substrate, drying to form a film, so as to obtain a waterborne polyurethane latex film, dissolving the polyviny-tetrafluoroethylene, or the polyviny-tetrafluoroethylene and the polyurethane, or the tourmaline powder and the polyviny-tetrafluoroethylene, or the tourmaline powder, the polyviny-tetrafluoroethylene and the polyurethane into a solvent to prepare spraying liquid with the content of solid of 8-12 percent, spraying the spraying liquid to the waterborne polyurethane latex film, drying under room temperature for 5-8 hours, and then drying under the temperature of 60-80 DEG C to form the film, so as to obtain a target product. The modified waterborne polyurethane latex film is high in hydrophobicity and can be widely applied to the field of wood materials, leather, building materials, metal materials and the like.

Description

technical field [0001] The invention relates to a polyurethane latex film and a preparation method thereof, in particular to a modified water-based polyurethane latex film and a preparation method thereof. Background technique [0002] Water-based polyurethane (WPU) with water as the dispersion medium has the advantages of non-toxic, non-combustible, environmental protection and energy saving. Economy, Efficiency, Ecology, Energy Energy). In recent years, based on the versatility and environmental friendliness of waterborne polyurethane, waterborne polyurethane as a coating has been widely used. However, due to the limitation of its molecular structure, the water resistance of waterborne polyurethane coating film is insufficient. For this reason, people have made various attempts and efforts to modify it to improve the hydrophobicity of waterborne polyurethane, such as "Synthesis and Application of Amino Silicone Oil Modified Waterborne Polyurethane Finishing Agent" publis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/40B32B27/30B32B27/18C08J7/04
Inventor 吴钊峰王化田兴友郑康周海峰叶显柱徐飞
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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