Anti-adhesive coating

 

(57) Abstract:

The invention relates to the field of application of non-stick, anti-adhesion, anti-corrosion coatings and can be used in the manufacture of bakery, confectionery and other products processing industry. The problem to which the invention is directed, is to improve the operational, mechanical, and thermal properties of anti-adhesive coatings and increase their adhesion to the surface of the aluminum grain shapes. Anti-adhesive coating consisting of a film of oxides of tin non-stoichiometric composition obtained by comminution in a pre-heated to 400-450oWith the aluminum surface to form a solution containing the ingredients in the following amounts, wt.%: SnCl45H2About 40-50; ethyl 40-45; isopropyl alcohol 10-15. The inventive coating has high performance, mechanical, thermal properties and good adhesion to the surface of the aluminum grain shapes. The use of the invention allows to increase the resource of grain shapes, and consequently, to reduce the downtime of the conveyor oven and increase its overall performance. table 2.

The image is used in the manufacture of bakery, confectionery and other products processing industry.

Known fluoropolymer composition for coatings, including pigments, fillers, surfactants, salt of zirconium and suspension of PTFE f-4D [1].

The disadvantage of this composition is a low adhesion to the surface to which is applied a composition.

The closest technical solution, selected as a prototype, is a composition for non-stick, anti-adhesion, anti-corrosion coatings obtained by the method of heterologously [2], including the components in the following amounts, by weight. %: suspension of 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.

The disadvantage of this arrangement is unsatisfactory fur is istii high temperature loads.

The problem to which the invention is directed, is to improve the operational, mechanical, and thermal properties of anti-adhesive coatings and increase their adhesion to the surface of the aluminum grain shapes.

This is achieved by the fact that the anti-adhesive coating consists of a film of oxides of tin non-stoichiometric composition obtained by comminution in a pre-heated to 400-450oWith the aluminum surface to form a solution containing the ingredients in the following amounts, wt.%:

SnCl45H2O - 40-50

Ethyl alcohol - 40-45

Isopropyl alcohol is 10 to 15

The specified ratio of the components, the formation is heated to 400-450oFrom the surface of the aluminum coverage form oxides of tin non-stoichiometric composition due to the occurrence of the following reactions [3]:

Snl4+H2About-->SnO2+HCl;

SNO2+restorer-->SNO+Sn+H2O;

SnO+O2-->SnO2;

SnO-->Sn+SnO2.

Thus obtained film of oxides of tin non-stoichiometric composition has anti-adhesive properties due to the lack of oxygen in the coating structure.

As aluminum bases use ebnoy forms with the aim of decamerone treated with 35% Hcl solution (GOST 3118-77) and washed in flowing deionized water, then for passivation of the working surface of its handle 75-80% solution NGO3(GOST 4461-77) followed by rinsing in flowing deionized water. To seal pestiviruses layer surface is treated 90% solution of N3RHO4(GOST 6552-80). After washing in flowing deionized water, grain shape is heated to 400-450oC and on its surface by a method of pulverizing put a solution prepared from the following ingredients: SnCl4H2O (TU 6-09-3084-82) 40-50%, ethyl alcohol (GOST 18300-87) 40-45%, isopropyl alcohol (GOST 9805-84) 10-15%, then the form is cooled naturally. Table 1 shows the compositions of the tested coatings.

Grain shape coated with the surface coating further passed laboratory and pilot tests in terms of the Mtsensk bakery.

As criteria of performance properties of the coating were taken, the number of production cycles bread forms prior to the termination of spontaneous separation of baked bread form while turning and the values of the contact angle of the surface with distilled water, determined by the method of "sedentary" drops.

In the adopted quality abrasion resistant coatings, some on brasiltri corresponding norms ARE norms UNI M7/European norm EN 154.

As a criterion of thermal properties of the coatings were determined number of idle production cycles bread forms to the loss of their operational properties.

To compare the operational characteristics of the claimed coating coatings known in the food industry were tested in parallel composition, obtained on the basis of the suspension of PTFE f-4D [1], and the composition obtained by the method of heterologously [2]. The results are given in table 2.

The inventive coating has high performance, mechanical, thermal properties and good adhesion to the surface of the aluminum grain shapes.

The use of the invention allows to increase the resource of grain shapes, and consequently, to reduce the downtime of the conveyor oven and increase its overall performance.

Sources of information

1. RF patent 2096435, IPC 09 D 127118, 1997.

2. RF patent 2087506, IPC 09 D 5/42, C 09 D 5/08, 1997 (prototype).

3. Antonov, O. N., Igoshin C. M., Frolenkov K. Y. Antiadhesive coatings based on films of complex oxides is about it consists of a film of oxides of tin non-stoichiometric composition, obtained by comminution in a pre-heated to 400-450oWith the aluminum surface to form a solution containing the ingredients in the following amounts, wt.%:

SnCl45H2ABOUT 40-50

Ethyl alcohol - 40-45

Alcohol isopropyl - 10-15h

 

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