A drum spray water-based fluorine coating and a preparation method thereof

Abstract

The present application relates to the field of paint, disclose a kind of drum spraying water-based fluorine coating and its preparation method.The coating includes: 100 parts by weight of silicone-modified fatty polyurethane emulsion, 10-35 parts by weight of thermosetting water-based acrylic resin, methyl etherified amino resin 10-20 parts by weight, polytetrafluoroethylene emulsion 10-30 parts by weight, PTFE micro powder 10-30 parts by weight, surfactant 1-40 parts by weight, ethanol 10-40 parts by weight, sodium formate 1-5 parts by weight, ammonia 10-30 parts by weight and water 80-200 parts by weight.The present application uses silicone-modified fatty polyurethane emulsion, methyl etherified amino resin, polytetrafluoroethylene emulsion, PTFE micro powder, improves the high temperature resistance of coating, can make coating reach the requirement of 200 degrees temperature resistance, coating does not fall off and cracking and discoloration.Through the compounding use of PTFE emulsion and PTFE micro powder, the paper RCA wiping resistance of product coating after high temperature resistance is improved, can pass RCA paper tape rubbing test 100-200 times, that is, it has wear resistance and scratch resistance, and has very excellent non-stick performance and waterproof performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to a kind of roller spraying water-based fluorine paint and preparation method thereof. BACKGROUND

[0002] Teflon is the alias of Polytetrafluoroethylene, chemical formula is -(CF2-CF2)n-, it is a kind of artificial synthetic polymer material by fluorine replacing all hydrogen atoms in polyethylene.Polytetrafluoroethylene has good mechanical properties, electrical properties, chemical resistance, weather resistance and non-stick and lubricity, is praised as "plastic king" in synthetic material field.Teflon material product is generally referred to as "non-stick coating", this material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents, almost insoluble in all solvents.

[0003] Water-based fluorine paint can be used in the following fields by spraying:

[0004] (1) automobile industry: oil seal, O-ring, glass inner and outer water bar, sealing strip and various sealing parts;

[0005] (2) chemical industry: can be used for the surface of various rubber and plastic products directly contacted with chemical products;

[0006] (3) petroleum industry: various oil drilling platforms and offshore operation platforms;

[0007] (4) engineering machinery: barrier or connecting piece of water, gas and electricity systems;

[0008] (5) household appliances: small hardware, small motor gasket sealing parts, bearings and shaft sleeve, etc;

[0009] (6) electronic products: parts or products with anti-scratch or water-repellent and anti-sticking performance requirements;

[0010] (7) high-speed rail industry: occasions with anti-sticking and wear-resistant performance requirements, such as toilets and restaurants, etc;

[0011] (8) children's toy market: lubricated and colored toys with green environmental protection and rich color performance requirements, such as various wooden, plastic or metal building blocks, etc;

[0012] (9) office supplies: paper, etc.

[0013] The spraying process of small parts often adopts the way of roller spraying, and the use environment of small parts is very complex, often requiring good high temperature resistance, but the adhesion of the coating of the prior art is not good at high temperature 200 degrees Celsius environment, so that the wear resistance and scratch resistance of the final product are not high. SUMMARY

[0014] The main purpose of the present application is to solve the problem of low wear and scratch resistance of products obtained by the spraying process of small parts in the prior art. The present application provides a kind of water-based fluorine coating for drum spraying, the coating comprises:

[0015] 100 parts by weight of silicone-modified fatty polyurethane emulsion, 10-35 parts by weight of thermosetting water-based acrylic resin, 10-20 parts by weight of methyl etherified amino resin, 10-30 parts by weight of polytetrafluoroethylene emulsion, 10-30 parts by weight of PTFE micro powder, 1-40 parts by weight of surfactant, 10-40 parts by weight of ethanol, 1-5 parts by weight of sodium formate, 10-30 parts by weight of ammonia and 80-200 parts by weight of water.

[0016] The acrylic resin can be water-soluble acrylic resin, the acrylic resin and ammonia are neutralized to obtain modified acrylic resin, or water-based acrylic resin can be directly used.

[0017] The surfactant is selected from one or more of lauryl alcohol polyoxyethylene ether, polyethylene glycol and heptadecanol polyoxyethylene ether carboxylate.

[0018] The concentration of the ammonia is 22-28wt%.

[0019] The particle size of polytetrafluoroethylene in the polytetrafluoroethylene emulsion is 0.2-0.4um.

[0020] The average particle size D50 of polytetrafluoroethylene in the PTFE micro powder is 1.6±0.6um.

[0021] A preparation method of a water-based fluorine coating, comprising the following steps:

[0022] Grind the silicone-modified fatty polyurethane emulsion, the thermosetting water-based acrylic resin, the methyl etherified amino resin, the PTFE micro powder, the ammonia, the ethanol, the sodium formate, the surfactant and the water to obtain a mixed solution;

[0023] Mix the mixed solution and the polytetrafluoroethylene emulsion to obtain the water-based fluorine coating.

[0024] The surfactant is selected from one or more of lauryl alcohol polyoxyethylene ether, polyethylene glycol and heptadecanol polyoxyethylene ether carboxylate.

[0025] The concentration of the ammonia is 22-28wt%.

[0026] The particle size of polytetrafluoroethylene in the polytetrafluoroethylene emulsion is 0.2-0.4um.

[0027] The average particle size D50 of polytetrafluoroethylene in the PTFE micro powder is 1.6±0.6um.

[0028] The present application adopts silicone-modified fatty polyurethane emulsion, thermosetting water-based acrylic resin, methyl etherified amino resin, polytetrafluoroethylene emulsion and PTFE micro powder, improves the high temperature resistance of the coating, and can make the coating reach the requirements of not falling off and cracking and not discoloring at 200 degrees. The use of PTFE emulsion and PTFE micro powder improves the paper RCA wiping resistance of the product coating after high temperature resistance, has wear-resistant and scratch-resistant performance, and has very excellent non-stick performance and waterproof performance. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The test result graph of the product prepared for Example 1 is shown.

[0030] Figure 2 The test result graph of the product prepared for Example 2 is shown.

[0031] Figure 3 The test result graph of the product prepared for Example 3 is shown.

[0032] Figure 4 The test result graph of the product prepared for Comparative Example 1 is shown.

[0033] Figure 5 The test result graph of the product prepared for Comparative Example 2 is shown.

[0034] Figure 6 The test result graph of the product prepared for Comparative Example 3 is shown.

[0035] Figure 7 The test result graph of the product prepared for Comparative Example 4 is shown. DETAILED DESCRIPTION

[0036] The terms "first", "second", "third", "fourth" and the like in the description and claims of the present application, and above drawings (if there are) are used to distinguish similar objects, and do not necessarily have to be used to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" or "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or production device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or production devices.

[0037] Silicone-modified fatty polyurethane emulsion: Yincui SILIKOPUR 8081.

[0038] Methyl etherified amino resin: cyan special amino resin 303 CYMEL 303LF.

[0039] Polytetrafluoroethylene emulsion: Juhua JF-4DCA, solid content 60%, particle size 0.2-0.4um.

[0040] PTFE micro powder: Shenyang Tianyuxiang micro powder material factory PTFE micro powder-A series.

[0041] Polyurethane emulsion: Andahuata water-based polyurethane resin AH-1502

[0042] Methyl ether amino resin: BASF / Luwipal 072 methyl ether amino resin.

[0043] Thermoplastic acrylic resin: ROPAQUE ULTRA-E, a water-based thermoplastic acrylic emulsion from Dow

[0044] Thermosetting water-based acrylic resin: Jining Tangyi Chemical Co., Ltd. J-668 water-based plastic resin dry fast yellowing resistant acrylic resin

[0045] Roll coating process includes the following steps:

[0046] (1) incoming product inspection; (2) incoming product storage; (3) warehouse inspection; (4) incoming product storage before spraying; (5) metering; (6) cleaning; (7) drying; (8) spraying; (9) tray separation; (10) baking; (11) cooling; (12) product inspection; (13) product packaging; (14) product delivery.

[0047] In the present application, the incoming product inspection preferably performs incoming inspection on the incoming product, confirms the material, shape, model, specification, quantity and spraying requirements of the incoming product; the incoming product storage preferably stores the incoming product in a ventilated and dry area at room temperature; the warehouse inspection preferably registers the incoming product according to the incoming product; the incoming product storage before spraying preferably stores the incoming product in a fixed processing area in a ventilated and dry manner at room temperature; the metering preferably meters the incoming product at 800-3000 per cylinder for basket spraying, too many workpieces will cause uneven spraying and thin coating; the cleaning preferably puts the incoming product with more oil stains or EPDM and silicone rubber and other special incoming products into the cleaning equipment for cleaning to ensure the adhesion and quality of the coating; the drying preferably puts the cleaned incoming product into an oven or a spraying machine for drying, the drying temperature is preferably 60-90°C, more preferably 70-80°C, the drying time is preferably 20-30 minutes, more preferably 23-27 minutes, and the moisture is evaporated until the surface is clean and dry; the spraying preferably pours the cleaned or metered incoming product into an automatic spraying machine for spraying; the tray separation preferably places the sprayed products that are easy to stick and cannot be stacked and baked on stainless steel baking trays according to the number; the baking preferably puts the baking trays, screens or high-temperature rods containing the sprayed products into an oven or a tunnel furnace for baking, the baking temperature is preferably 130-150°C, more preferably 135-145°C, and the baking time is preferably 20-40 minutes, more preferably 30 minutes; the cooling preferably cools the baked products naturally; the product inspection preferably performs quality inspection on the cooled products, including manual inspection and automatic visual inspection equipment inspection, the automatic video inspection equipment can automatically detect the product size, product and coating defects, color difference and mixed parts and other requirements, which is efficient and accurate.

[0048] In the present application, the caliber of the spray gun for spraying is preferably 0.8-1.5 mm, the position (front, back, up, down) of the spray gun is set according to the volume of the material to be treated: when the volume of the material to be treated is not less than half a cylinder, the spray gun is placed at the back and the top, and when the volume of the material to be treated is less than half a cylinder, the spray gun is placed at the front and the bottom; the speed of the roller is preferably 1-30 rpm, more preferably 10-25 rpm; the distance between the spray gun and the material to be treated is preferably 10-20 cm, more preferably 14-18 cm; the number of spraying is preferably 80-200 times, more preferably 100-160 times; the time of single spraying is preferably 1-5 s, more preferably 1-2 s; the interval time between two spraying is preferably 0.1-1 s, more preferably 0.3-0.7 s; the total time of spraying is preferably 10-70 minutes, more preferably 30-50 minutes; the oil output of the spray gun is preferably 0.5-2 grids, more preferably 1-1.5 grids, and too much spraying oil will cause product sticking and surface bloom; the atomization size of the spray gun is preferably 1 / 4-1 / 2, more preferably 1 / 3; the spray width of the spray gun is preferably 20-120 degrees, more preferably 50-90 degrees.

[0049] In the present application, the curing device is preferably an oven; the curing temperature is preferably 80-150℃, more preferably 100-130℃, and further preferably 120℃, and the holding time is preferably 20-50 minutes, more preferably 25-40 minutes, and too low temperature or insufficient time will result in incomplete curing of the coating and reduced adhesion; the base adhesive resin has self-crosslinking properties and can be self-crosslinked and cured at low temperature, and the amino resin can further accelerate crosslinking and curing to form a film; after curing, the obtained material is preferably naturally ventilated for cooling and drying; the cooling and drying time is preferably 12 hours.

[0050] The above spraying method provided by the present application can spray water-based fluorine coating on substrates such as rubber, plastic, paper and wood, especially on rubber seals, to form a Teflon fluorine-containing coating on the surface of the rubber seals and other materials, and the obtained fluorine-containing coating has a smooth and flat appearance and has the effects of wear resistance, medium resistance and corrosion resistance; the coating can be transparent or colored, and can impart various colors such as white, black, red, orange, yellow and green to the sprayed products, facilitating differentiation and identification and improving the identification speed and overall efficiency of online automatic assembly; the fluorine-containing coating can impart UV identification function to the product, and the product coated with transparent or natural color fluorine-containing coating can display blue or green color under a UV lamp of 395 nm, which is conducive to identification and assembly and maintenance work.

[0051] Example 1

[0052] Silicone-modified fatty polyurethane emulsion (Wingate SILIKOPUR 8081) 100 parts by weight, thermosetting water-based acrylic resin 30 parts by weight, methyl etherified amino resin (Cytec Amino Resin 303 CYMEL 303LF) 10 parts by weight, polytetrafluoroethylene emulsion (Jumbo JF-4DCA) 20 parts by weight, PTFE micropowder (PTFE micropowder A series) 20 parts by weight, surfactant lauryl polyoxyethylene ether 30 parts by weight, ethanol 30 parts by weight, sodium formate 2 parts by weight, ammonia water 20 parts by weight, and water 120 parts by weight.

[0053] Example 2

[0054] Silicone-modified fatty polyurethane emulsion (Wingate SILIKOPUR 8081) 100 parts by weight, thermosetting water-based acrylic resin 30 parts by weight, methyl etherified amino resin (Cytec Amino Resin 303 CYMEL 303LF) 15 parts by weight, polytetrafluoroethylene emulsion (Jumbo JF-4DCA) 30 parts by weight, PTFE micropowder (PTFE micropowder A series) 10 parts by weight, surfactant lauryl polyoxyethylene ether 30 parts by weight, ethanol 30 parts by weight, sodium formate 2 parts by weight, ammonia water 20 parts by weight, and water 120 parts by weight.

[0055] Example 3

[0056] Silicone-modified fatty polyurethane emulsion (Wingate SILIKOPUR 8081) 100 parts by weight, thermosetting water-based acrylic resin 30 parts by weight, methyl etherified amino resin (Cytec Amino Resin 303 CYMEL 303LF) 12 parts by weight, polytetrafluoroethylene emulsion (Jumbo JF-4DCA) 25 parts by weight, PTFE micropowder (PTFE micropowder A series) 15 parts by weight, surfactant lauryl polyoxyethylene ether 30 parts by weight, ethanol 30 parts by weight, sodium formate 2 parts by weight, ammonia water 20 parts by weight, and water 120 parts by weight.

[0057] Comparative Example 1

[0058] The same as Example 1, except that Anhua Tai water-based polyurethane pu resin AH-1502 was used instead of Wingate SILIKOPUR 8081 in Example 1. The resin in AH-1502 is a polyurethane that is not modified with silicone.

[0059] Comparative Example 2

[0060] The same as Example 1, except that BASF / Luwi methyl etherified amino resin Luwipal 072 was used instead of Cytec Amino Resin 303 CYMEL 303LF in Example 1. 303 CYMEL 303LF is a highly etherified, while Luwipal 072 is a medium etherified methyl etherified amino resin.

[0061] Comparative Example 3

[0062] The same as Example 1, except that three-leaf AquaFLON 52 PTFE aqueous dispersion was used instead of PTFE micro powder A series.

[0063] Comparative Example 4

[0064] The same as Example 1, except that the thermoplastic acrylic resin ROPAQUE ULTRA-E aqueous thermoplastic acrylic emulsion of Dow was used instead of the thermosetting aqueous acrylic resin: J-668 aqueous plastic resin dry fast yellowing resistant acrylic resin of Jining Tangyi Chemical Co., Ltd.

[0065] The circular ring workpiece was sprayed in a roll spraying device, and the circular ring workpiece with a surface coating thickness of 30 microns was selected. After the circular ring workpiece sample was placed at 200 degrees for 48 hours, the 175g paper RCA wiping performance of the test coating was tested, and the wiping frequency was 50 times. The test results of Examples 1-3 and Comparative Examples 1-3 are shown in the following figure: Figures 1-7 It can be seen that Examples 1-3 have better wiping resistance in high temperature environment. The thermosetting aqueous acrylic resin has high gloss, high hardness, excellent adhesion, excellent alcohol resistance, and salt spray resistance.

[0066] The above-described examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art will understand that they can still modify the technical solutions described in the foregoing examples, or make equivalent replacements to some of the technical features. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A drum-sprayed aqueous fluorocarbon coating, characterized in that, The coating comprises: 100 parts by weight of silicone-modified fatty polyurethane emulsion, 10-35 parts by weight of thermosetting water-based acrylic resin, 10-20 parts by weight of methyl etherified amino resin, 10-30 parts by weight of polytetrafluoroethylene emulsion, 10-30 parts by weight of PTFE micro powder, 1-40 parts by weight of surfactant, 10-40 parts by weight of ethanol, 1-5 parts by weight of sodium formate, 10-30 parts by weight of ammonia water and 80-200 parts by weight of water; The methyl etherified amino resin is a highly etherified amino resin; The particle size of polytetrafluoroethylene in the polytetrafluoroethylene emulsion is 0.2-0.4um; The PTFE micro powder is PTFE micro powder-A series of Shenyang Tianyuxiang Micro Powder Material Factory.

2. A roll-spraying water-based fluorocarbon coating according to claim 1, characterized in that, The surfactant is selected from one or more of lauryl alcohol polyoxyethylene ether, polyethylene glycol, and heptadecanol polyoxyethylene ether carboxylate.

3. A roll-spraying water-based fluorocarbon coating according to claim 1, wherein The concentration of ammonia water is 22-28wt%.

4. The method of claim 1, wherein the water-based fluorocarbon coating is applied by a rotary atomizer. 5 The method comprises the following steps: Grinding silicone-modified fatty polyurethane emulsion, thermosetting water-based acrylic resin, methyl etherified amino resin, PTFE micro powder, ammonia water, ethanol, sodium formate, surfactant and water to obtain a mixed solution; Mixing the mixed solution and polytetrafluoroethylene emulsion to obtain a water-based fluorine coating; The methyl etherified amino resin is a highly etherified amino resin; The particle size of polytetrafluoroethylene in the polytetrafluoroethylene emulsion is 0.2-0.4um; The PTFE micro powder is PTFE micro powder-A series of Shenyang Tianyuxiang Micro Powder Material Factory.

5. A method of preparing a drum-sprayed aqueous fluorocarbon coating according to claim 4, characterized in that, The surfactant is selected from one or more of lauryl alcohol polyoxyethylene ether, polyethylene glycol, and heptadecanol polyoxyethylene ether carboxylate.

6. A method of preparing a drum-sprayed aqueous fluorocarbon coating according to claim 4, characterized in that, The concentration of ammonia water is 22-28wt%.

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