Composition for non-stick, anti-adhesion, anti-corrosion coating method heterologously

 

(57) Abstract:

Composition for non-stick, anti-adhesion, anti-corrosion coatings, which are applied by way of heterologously on a hard surface, can be used in the manufacture of homeparty, dishes, appliances. The proposed composition includes components, wt.%: suspension PTFE f-4D 36,0 - 43,0 concentration of 50 - 60% 36,0-43,0 based 57%, including f-4D of 20.5 and 24.5; suspension of PTFE f-4MD concentration of 53% 16,0-20,0, including f-4MD of 8.5 to 10.6; mica ground 2,4 - 3,5; titanium dioxide 1,0 - 2,0; Aerosil 1,0 - 2,5; oxalate of Nickel 1,0 - 2,0; aluminum powder of 2.0 to 3.0; ethoxylated alkyl phenol of 1.5 to 2.5; polyvinylpyrrolidone 0,7 - 1,5; polyorganosiloxane 3.5 to 4.5; alcohol is 1,4-butanediol or furfuryl 1,0 - 2,0; xylene 0,7-1,5; ethyl cellosolve 0,7 - 1,5; phosphoric acid of 0.2 - 0.3; 4-amino-2,2,6,6-tetramethylpiperidine 2.0 to 2.5; water - the rest. table 2.

The invention relates to the field of application of non-stick, anti-adhesion, anti-corrosion coating by way of heterologously on a hard surface and can be used in the manufacture of chemical equipment, utensils, appliances, etc.

Known composition (Application N 62-234675, Apesta film-forming components, as well as the substance of the main character for the complete or partial neutralization of the carboxyl groups of the polymer, organic solvent and water, the water dispersion of a solid at normal temperature paraffin with a melting point below the temperature of curing of the film.

A disadvantage of the known compositions are low physico-mechanical properties of the coating low adhesive strength to a metal substrate and elasticity.

Known composition (Application N 59-34799, Japan, 1984), consisting per 1 l of the main solvent (distilled water or a hydrophilic organic solvent), 30 350 ml capable of electrolytic deposition of the resin and 10 to 100 ml of electrically neutral filler type molybdenum disulfide, aluminum oxide, silicate aluminum, silicon oxide, titanium oxide, graphite (carbon technical) and mica; fluoride resin and auxiliary solvent of alcohol, butanol, isopropanol or ethyl cellosolve.

The disadvantage of this arrangement is the obtaining of coatings limited thickness, its low maintenance properties: wear resistance, temperature resistance, anti-stick properties, corrosion resistance and nestabilnost the resin), due to the presence in the composition of ionic additives.

Closest to the technical essence and the achieved result to the present invention is a composition (Application N 1557230, MKI C 09 D 3/74, B 05 D 5/08, UK, 1979) for non-stick coating comprising polytetrafluoroethylene in the form of 50 to 65% water suspension, xylene, mica, ethoxylated Nonylphenol pigment titanium dioxide and water.

The disadvantage of this composition are low maintenance properties of the coating non-stick, anti-adhesion and anti-corrosion; not sufficiently high adhesive strength of the coating, due to the absence of active fillers; the impossibility of applying its way heterologously because it doesn't include additives possessing thixotropic properties; inability to cover a long time to resist without fracture and thermal shock.

Object of the invention is the improvement of performance, corrosion-protective properties and adhesive strength of the coating to substrate by anchoring engagement on the surface due to the implementation of heterologously.

This object is achieved due to the fact that the composition containing 57% aqueous suspension of poly is the added 53% aqueous suspension of a copolymer of tetrafluoroethylene with HEXAFLUOROPROPYLENE, Aerosil, Nickel oxalate, aluminum powder, polyvinylpyrrolidone, 30% solution of polymethylphenylsiloxane in toluene, 1,4-butanediol or furfuryl alcohol, phosphoric acid and 4-amino-2,2,6,6-tetramethylpiperidine.

The proposed composition of the following composition, wt.

1.Aqueous suspension of polytetrafluoroethylene f-4D (concentration 50,6-65%), THE 6-05 (57%) 36,0 43,0

including PTFE 20,5 24,5

2. Aqueous suspension of a copolymer of tetrafluoroethylene with HEXAFLUOROPROPYLENE (53%), THE 6-05-2012-85 16,0 20,0

including PTFE 8,5 10,6

3.Mica ground, GOST 855-74 2,4 3,5

4.The polyvinylpyrrolidone, THE 6-02-1858-81 0,7 1,5

5.Titanium dioxide, GOST 9808-84 1,0 2,0

6.Ethoxylated alkyl phenol, GOST 8433-81 1,5 2,5

7. 30% solution of polymethylphenylsiloxane in toluene, GOST 15081-78 3,5 4,5

8. 4-amino-2,2,6,6-tetramethylpiperidine 2,0 2,5

9.Alcohol is 1,4-butanediol or furfuryl, THE 6-092-40-0259-84 1,0 2,0

10.Xylene, GOST 9949-76 0,7 1,5

11.The ethyl cellosolve, GOST 8313-76 0,7 1,5

12.Aerosil, mark AA 1,0 2,5

13.Phosphoric acid, GOST 6552-80 0,2 0,3

14.Aluminum powder 2,0 3,0

15.Oxalate of Nickel 1,0 2,0

16.Water, GOST 6709-72 else.

As polyorganosiloxane used 30%-NY toluene solution of the film, are optimal from the point of view of most rapid deposition of the desired amount of polymer, and also from the point of view that of this composition in a selected range of pH in the presence of a filler having thixotropic properties of Aerosil, a polymer film is formed by heterologously.

As components contributing to the high performance properties of coatings produced by heterologously proposed composition used Aerosil, titanium dioxide, Nickel oxalate, fine mica, aluminum powder, polytetrafluoroethylene in the aqueous dispersion, polyorganosiloxane and polyvinylpyrrolidone.

It is known the use of these components to a specified destination:

titanium dioxide and mica, as wear-resistant fillers;

polyorganosiloxane as heat resistant additive;

Aerosil, as a filler for improving the corrosion resistance and adhesive strength of ties;

PTFE, as an additive, providing anti-stick properties.

However, there are no known technical solution for the application of polymer films by heterologously, where it would use a combination of fillers: th form scaly mica with a high degree of anisotropy of the form of the oxalate of Nickel. Moreover, titanium dioxide, mica, Aerosil, Nickel oxalate, aluminum powder was pre-treated with emulsion consisting of adhesive, which is used polyvinylpyrrolidone, modifier ethoxylated alkylphenol and a mixture of organic solvents.

It is the combination of system fillers, organic and mineral, one of which has a high thixotropic properties, as well as pre-treatment of the latter aqueous-organic emulsion, allowed to achieve non-stick, anti-adhesion, anti-corrosion, wear and heat resistant properties, which is a significant contrast to the known coatings obtained by electrophoretic method.

Significant difference from the known coatings with non-stick properties, is that it can, in addition to the metal surface, be applied to the surface, which has a sufficiently high porosity and roughness and thanks to anchor the engagement of the polymer film in the pores of the framework to improve the performance properties and adhesive strength of the coating.

The inclusion in the composition paliwal, the ethyl cellosolve) and water provides a uniform removal of the contained polytetrafluoroethylene and all mineral fillers, processed the specified mixture in the coating process. As a result, the composition is depleted evenly on all parts, which allows to obtain coatings of consistent quality and to exclude the component adjustment. None of the known technical solutions are not proposed for inclusion in the composition for application by way of heterologously polyvinylpyrrolidon in combination with organic solvents, therefore, this characteristic is a significant difference between the proposed solutions from the known.

The availability of songs for non-stick, anti-adhesion, anti-corrosion coatings produced by means of heterologously, polymethylphenylsiloxane in combination with polytetrafluoroethylene in an environment of 1,4-butanediol or furfuryl alcohol provides a high temperature resistant coating and the stability of the composition during oscillation of the external conditions. Therefore, this characteristic is also significant difference between the proposed solutions from the known.

Keeping in song 4-amino-2,2,6,6-tetramethylpiperidine to pH 9-11 enhances textrect. It is also significant difference between the proposed solutions from well-known not only in the technological, technical and theoretical terms.

The use of ionic surfactants ethoxylated alkylphenol (OP-10) in combination with polyvinylpyrrolidone and a mixture of organic solvents based on the rendered heat-resistant together with polyorganosiloxanes done by the method of heterologously, we do not know. Therefore, this characteristic is also characterized by substantial novelty.

Uniform exit of the liquid aqueous phase of the thickness of the coating provides its formation on the basis of the four solvents are toluene, xylene, ethyl cellosolve, ethanol (1/4-butanediol or furfuryl) and water, having a large difference of boiling points (from 100 to 172oC) that helps to maintain the ratio of solid and liquid phases in the microlayer forming coating prevents the formation of cracks in the floor that leads to high operational properties, increases non-stick properties of the coating due to the "floating" of polytetrafluoroethylene regarding mineral fillers and other binders slow "serialno, before processing the aqueous-organic emulsion was processed phosphoric acid, which was created on its surface a protective phosphate layer that protects from interaction with water, the office accompanied by the release of hydrogen. This technical solution is unknown. Therefore, this characteristic is also characterized by substantial novelty.

Also unknown is used as filler oxalate of Nickel, which, if the heat treatment is implemented in the structural mesh PTFE and thus increases the durability of the coating.

Thus, all distinctive features of the proposed composition is not identical to the known technical solutions are not equivalent.

In the process carried out by the authors of complex studies were established ranges of maximum permissible values of each component of the composition.

The optimum content of the fluoroplastic f-4D in the composition corresponds to 20.5

24,5% calculated on dry substance, which is 36,0 43,0% aqueous suspension of PTFE 57,0% concentration and 8.5 10.6% of fluoroplastic f-4D, calculated on dry substance, which corresponds to 16 of 20% aqueous suspension of PTFE 53% concentration. With the introduction of ft the cover, and most of these decreases the stability of the coating to abrasion.

The combination of system dispersion of fillers,

Titanium dioxide 1,0 2,0

Anisotropy mica 2,4 3,5

Aerosil 1,0 2,5

Aluminum powder 2,0 3,0

Oxalate of Nickel 1,0 2,0

helped to implement the process of heterologously, to improve the performance of the coating wear resistance, corrosion resistance, ability a long time to resist without fracture and thermal shock.

Introduction to the composition of polyorganosiloxane less than 3.5% lower thermal resistance and impair the technological properties of the composition. Excess polyorganosiloxane than the 4.5% creates large internal stresses that cause cracks in the floor.

When the content oksietilirovannykh alkylphenol less than 1.5% reduced kinetic stability of fillers in the composition, when the content is more than 2.5% of the composition produces rich foam and deteriorate the mechanical properties of the coating, as there has been a marked degradation of the modifier during curing of the coating.

Organic amine, 4-amino-2,2,6,6-tetramethylpiperidine, provides the optimal pH of the medium 9,0 11,0, in which the most strongly proyavlyayutsya coating are given in table.1.

To characterize the properties of coatings obtained by the method of heterologously of composite material, at various ratios of the constituent components in accordance with table.1, defined:

the coating thickness with a micrometer type MK-25;

porosity in the cathode polarization plate coated in a solution of 20% sulfuric acid at a voltage of 10 V (when sealed porous coating of the release of hydrogen occurs on uncovered parts);

adhesion, a method of parallel incisions with the use of adhesive tape LT-40;

corrosion resistance of solsticetm in 5% NaCl;

the strength of the attack on GOST 4765-73;

elasticities Eriksen;

anti-stick properties for fast removal of burnt milk with water;

durability.

Example 1. A plate of aluminum alloy AK-5M2 in size HH,7 mm degreased by cathodic polarization in distilled water to which is added a surfactant, and then successively washed with technical and distilled water. You can also use any metal surface and the surface has a sufficiently high porosity and roughness. The plate causing the f-4D, 57% 36,0

including f-4D 20,5

OP-7 2,2

water 13,3

2.Suspension of PTFE f-4D 16,0

including f-4MD, 53% 8,5

OP-7 0,96

water 6,56

3.Mica ground 3,5

4.Titanium dioxide 2,0

5.Aerosil 2,5

6.Oxalate of Nickel 2,0

7.Aluminum powder 3,0

8.Ethoxylated alkyl phenol 2,5

9.Polyvinylpyrrolidone 1,5

10.Polyorganosiloxane, KO 08 4,5

including CO-08 1,5

toluene 3,0

11.Alcohol 2,4-butanediol or furfuryl 2,0

12.Xylene 1,5

13.The ethyl cellosolve 1,5

14.Phosphoric acid 0,3

15. 4-Amino-2,2,6,6-tetramethylpiperidine 2,5

16.Water 18,7

The composition of this composition is prepared as follows: mix 13 ml of distilled water, 3.5 g of mica and 2.5 g of ethoxylated alkylphenol, after which the resulting suspension for 5-10 min is subjected to ultrasound treatment using a disperser of UZDN-2T. Get the emulsion, consisting of 1.5 ml of polyvinylpyrrolidone, and 4.5 ml of polyorganosiloxane, 2.0 ml of 1,4-butanediol, 1,5 ml of xylene, 1.5 ml of ethyl cellosolve and 2.5 ml of an ethoxylated alkylphenol. To it under continuous stirring of 5.7 ml of distilled water, 2.5 g of Aerosil suspension of mica, 2.0 g of the oxalate of Nickel, 2.0 g of titanium dioxide, 3.0 g of aluminum powder predvaritel-2T. Then in this system under continuous stirring, the aqueous suspension of PTFE f-4D and f-4MD respectively 36 g and 16 g, together with 2.5 ml of 4-amino-2,2,6,6-tetramethylpiperidine.

The coating obtained is subjected to a sintering operation at a temperature of 380oC and determine its basic properties: the coating thickness of 20 μm, the corrosion-protective properties (test duration until you see signs of corrosion) 480 h floor without visible changes, adhesion 1 point, resistance to shock 4.5 MPa, modulus of elasticity for Eriksen 1 mm, anti-stick properties - burnt milk is removed freely running water, wear resistance when operating in 8 months there are no violations on the floor.

Example 2. On prepared plate of aluminum alloy AK-5M2 coated way of heterologously of composition of composition 4 of table.1, wt.

1.Suspension of PTFE f-4D, 57% 43,0

including f-4L 24,5

OP-7 2,6

water 15,9

2.Suspension of PTFE f-4MD, 53% 20,0

including f-4MD 10,6

water 8,2

OP-7 1,2

3.Mica ground 2.4GHz

4.Titanium dioxide 1,0

5.Aerosil 1,7

6.Oxalate of Nickel 1,0

7.Aluminum powder 2,0

8.Ethoxylated alkyphenol 1,5

9.Watering is 7

13.The ethyl cellosolve 0,7

14.Phosphoric acid 0,2

15.4-Amino-2,2,6,6-tetramethylpiperidine 2,0

16.Water 19,3

The composition of this composition is prepared as in example 1. The coating obtained has the following characteristics: thickness of 18 μm, the corrosion-protective properties (test duration until you see signs of corrosion) 480 h floor without visible changes, adhesion 1 point, resistance to shock 5 MPa, the elastic Eriksen 1 mm, anti-stick properties - burnt milk is removed freely running water, wear resistance when operating in 8 months there are no violations on the floor.

Similarly preparing compounds 1, 3, 5, of which are applied coating. The properties of coatings obtained from the compositions listed in table.1, are presented in table.2.

Thus, the proposed composition allows to obtain by way of heterologously coatings with high enough, non-stick, anti-adhesion and anti-corrosion properties.

Composition for non-stick, release, antikorrozionnoe coating method heterologously containing 57% aqueous suspension of polytetrafluoroethylene, ethoxylated alkyl phenol, suspensio polytetrafluoroethylene f 4D and an additional 53 percent aqueous suspension of a copolymer of tetrafluoroethylene with HEXAFLUOROPROPYLENE f - 4M, Aerosil, Nickel oxalate, aluminum powder, polyvinylpyrrolidone, 30% solution of polymethylphenylsiloxane in toluene, 1,4-butanediol or furfuryl alcohol, phosphoric acid and 4-amino-2,2,6,6-tetramethylpiperidine in the following ratio, wt.

57% aqueous suspension of polytetrafluoroethylene f 4D 36,0 43,0

53% suspension in water of a copolymer of tetrafluoroethylene with HEXAFLUOROPROPYLENE f 4MD 16,0 20,0

Mica ground 2,4 3,5

Titanium dioxide 1,0 2,0

Aerosil 1,0 2,5

Oxalate of Nickel 1,0 2,0

Aluminum powder 2,0 3,0

Ethoxylated alkyl phenol 1,5 2,5

Polyvinylpyrrolidone 0,7 1,5

30% solution of polymethylphenylsiloxane in toluene 3,5 4,5

1,4-Butanediol or furfuryl alcohol 1,0 2,0

Xylene 0,7 1,5

The ethyl cellosolve 0,7 1,5

Phosphoric acid 0,2 0,3

4-Amino-2,2,6,6-tetramethylpiperidine 2,0 2,5

Water Ostalnoe

 

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