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Anti-staining coating solution comprising inorganic polysilazane

An inorganic polysilazane and coating solution technology, applied in antifouling/underwater coatings, biocide-containing paints, coatings, etc. Uniformity, image distortion, etc.

Inactive Publication Date: 2003-12-17
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the waterproofing effect of waterproofing with conventional waterproofing wax cannot be said to be satisfactory, or even if sufficient waterproofing is performed initially, the waterproofing effect cannot be said to be long-lasting, so that a long-lasting and sufficient antifouling effect cannot be exhibited
Moreover, traditional hydrophilic coatings can only bring hydrophilicity briefly or in a very short period of time, so it is almost impossible to expect sufficient durability of the hydrophilic effect, and it is difficult to have a uniform water film on the hydrophilic coating , thus distorting the transmitted or reflected image and making their practical application on items problematic

Method used

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  • Anti-staining coating solution comprising inorganic polysilazane

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0102] Preparation Example 1 (preparation of inorganic polysilazane)

[0103] A gas inlet, a mechanical stirrer and a Dewar condenser were installed in a four-necked flask with an inner capacity of 300ml. The inside of the reactor was replaced with dry deoxygenated nitrogen, and then 150 ml of dry degassed pyridine was added to a four-necked flask and cooled on ice. Then, 16.1 g of dichlorosilane was added to the four-necked flask over 50 minutes to form a white solid adduct (SiH 2 Cl 2 2Py). The reaction mixture was cooled on ice under vigorous stirring and sparging over 1 hour with a mixture of nitrogen and 10.9 g of ammonia, which had been previously purified by passing through soda lime tubes and activated carbon tubes. After the reaction was complete, the solid product was removed by centrifugation and subsequent filtration. By removing the solvent from the filtrate under reduced pressure (50° C., 5 mmHg, 2 hours), 5.52 g of glassy solid polysilazane was obtained. Th...

Embodiment 1

[0105] 0.5 parts by weight of the inorganic polysilazane obtained in Preparation Example 1 and 0.02 parts by weight of DMPP (catalyst) were dissolved in a solvent to obtain an antifouling coating solution for automobile bodies and wheels, wherein the solvent consisted of 1.98 parts by weight Composed of xylene and 97.5 parts by weight of Pegasol AN45 (Mobil Sekiyu Corp.).

[0106] The coating solution was spray-coated onto the coated steel sheet by means of a spray gun in such an amount as to give a coating layer thickness of 0.2 µm after conversion to silica. After drying, the coating was tested in an outdoor irradiation test, and the change at the contact angle was observed, and the results in Table 1 were obtained.

[0107] Days of outdoor exposure (days)

0

7

14

21

28

3 months

6 months

1 year

Contact angle (degrees)

65

41

23

16

11

10

9

10

[0108] As can b...

Embodiment 2

[0112] 1 part by weight of the inorganic polysilazane obtained in Preparation Example 1 and 0.04 parts by weight of DMPP (catalyst) were dissolved in a solvent to obtain an antifouling coating solution for dentures, wherein the solvent consisted of 98.96 parts by weight of Pegasol AN45 (Mobil Sekiyu Corp.).

[0113] The coating solution was spray-coated over the entire denture by a spray gun to form a silica coating with a thickness of 0.3 μm on the denture. The coating was dried in an oven at 45° C. for 60 minutes, and then treated in a high-temperature and high-humidity device at 40° C. and 90% relative humidity for 12 hours. A hydrophilic and dense silica coating is formed on the surface of the denture, and when the denture is used, the coating will not be damaged, dirt can be easily washed off with water, and no odor will be produced.

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Abstract

An anti-staining coating solution which comprises 0.5 to 10 wt % of a solvent-soluble inorganic polysilazane having a recurring unit represented by the following general formula: (I), 0.5 to 10 wt % relative to the pure polysilazane of a catalyst such as 4,4'-trimethylenebis(1-methylpyrizine), and a diluting solvent. The solvent is appropriately selected, depending on an article to be coated, from among a mineral spirit, a paraffinic solvent, an aromatic solvent, an alicyclic solvent and their mixtures. The coating solution having been applied on an automobile body, an automobile wheel, a denture, a grave stone, an interior or exterior of a house, a toilet, a kitchen, an article for use in a water section in a house such as a bath, a toilet stool, a sign board, a plastic article, a glass article or the like forms a strong and close coating film and imparts good hydrophilic and anti-staining properties being durable over a long period of time to an article coated.

Description

technical field [0001] The present invention relates to an antifouling paint solution by applying it to the casings and wheels of automobiles, trains, airplanes, etc., dentures, tombstones, the interior and exterior of houses, in toilets, kitchens, washrooms, bathtubs, etc. A hydrophilic coating with excellent antifouling function can be formed on the surface of products used together with water, notice boards, signboards, plastic products, glass products, etc. Background technique [0002] Various measures are generally taken to prevent contamination of the surface of the article. For example, car bodies are easily soiled by dust, combustion products such as exhaust fumes, and the like. The vehicle body is thus coated with wax to form a wax coating, thus preventing contamination of the vehicle body. By making the surface of the vehicle body waterproof, when water touches the surface of the vehicle body, the water forms water droplets and flows down the surface of the vehi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/16
CPCC09D183/16C08L2666/28
Inventor 铃木直
Owner MERCK PATENT GMBH