Polymer composition for the application of anti-friction coatings on rubber products

 

(57) Abstract:

Purpose: for the application of anti-friction coatings on rubber products and can be used in the automotive industry. The inventive composition comprises, in wt.%: -aminopropyltriethoxysilane 60 - 65; phthalic anhydride 4 - 8; acetoacetic ester 8 - 12; ethyl silicate with the content of SiO238 - 42 wt.% 15 - 28. The invention allows to reduce the coefficient of friction surface rubber products in contact with the working surface of the glass. 3 table.

The invention relates to the field of compositions of macromolecular substances, namely, to compositions obtained by the reaction of formation of links containing silicon in combination with nitrogen, oxygen, and can be used in the automotive industry.

It is known that the surface modification of rubber in the interests of improving the durability of the cuffs can be performed by introducing into the composition of the rubber mixture of polytetrafluoroethylene (Golubev, A. and any other Contact sealing rotating shafts.-M: Mechanical Engineering, 1976.-S. 76), silicon nitride (Rybalov S. L., Grigorova E. B. L. Fomina, On the influence of silicon nitride on the lubricating properties of the sealing rubber.-Rubber is mirovaniya rubber radial rotary shaft seals.-In Proc. : Achievements of science and technology in the field of rubber.-M.: Chemistry, 1969.-C. 262-273).

Antifriction properties of rubbers from fluoro increase with the introduction of rubber graphite in combination with PTFE (Belova, I. S. and other

The use of solid lubricants in the compounding of rubber from silicone elastomer to increase its wear resistance.-Rubber & rubber, N 12, 1973.-c.24-25).

A method for reducing the coefficient of friction and wear of rubber parts by chemical modification of their surfaces, creating a surface film of fluorinated hydrocarbons. The film thickness 50..100 μm (Gladston H. M., Sheterby W. B. Reduce Friction and Wear Slippery Rubber Surface. Product Engineering, vol. 35, No. 15, 1964. - p. 96-98). The same method is characterized by technology education fluorinated film, was used in the domestic industry (Nudelman H. N. and others About the increase of wear resistance of rubber parts by fluorination of the surface.-Rubber & rubber, N 3, 1969, S. 21-23).

A known method of manufacturing RTI in accordance with THE 38.105257-89

(The rubber seals with a spray-surge pile for car Windows). This method in essence is two-stage. The operation of applying polyamide pile precedes the operation of applying polihlorirovanie surface (explanatory note to the technical regulations for production belts wiper blades.-AO -"Balakovorezinotekhnika", TR 57-047-91).

It is also known that to reduce friction on the surface of the products can be applied antifriction coating based on PTFE (SU, Author's certificate N 227807, Bulletin of inventions, N 23, 1965) or polytetrafluoroethylene and fluorinated rubber (SU, Author's certificate N 994295, class C 08 J 5/16, 1983 - prototype).

The present invention is to reduce the coefficient of friction of rubber in contact with the working surface of the glass.

To solve this task we offer coating the surface of the RTI polymeric organosilicon composition comprising the following components (wt.%):

- aminopropyltriethoxysilane - 60...65

phthalic anhydride (PA) - 4...8

acetoacetic ether (AU) - 8...12

ethyl silicate-40 (ethyl silicate with the content of SiO238-42 wt.%) - 15...28

with a flow rate of the composition 0.015 0.020...mg/cm2products.

Example 1. Preparation of polymeric compositions.

Mix 130 grams of acetoacetic ester with 380 grams of AGM-9 ( - aminopropyltriethoxysilane).

IR-spectrum: 1090 cm-1- (Si-O-C), 1170 cm-1- (CH3C(O)C), 1655 cm-1- (C=O), 1610 cm-1- (C=C), 3300 cm-1- acc(OH) enol form AU.

the Ah AGM-9.

IR-spectrum: 1650 cm-1- (C=O) when pairing with aromatic nucleus, 1560 cm-1- (NH), 3300 cm-1and 3070 cm-1- secondary amide /acc(NH) and overtone/, 1090 cm-1- (Si-O-C).

Example 3. Preparation of polymeric compositions.

The polymer composition is prepared as follows. Dissolve 74 grams of phthalic anhydride (GOST 5869-77) in 800 grams of AGM-9 (TU 6-02-724-77), then added with stirring to 130 grams of acetoacetic ester (GOST 9799-79). After cooling, the mixture there was added 250 grams of ethyl silicate-40 (oligomeric ethyl esters articlenews acid).

IR-spectrum: 1090 cm-1- (Si-O-C), 1170 cm-1- (CH3C(O)C), 1655 cm-1- (C=O), 1610 cm-1- (C=C), 3300 cm-1-acc(OH) enol form AU, 1560 cm-1- (NH), 3300 cm-1and 3070 cm-1- secondary amide / acc(NH) and overtone/.

Example 4. The results of the tests.

Testing the slipperiness of the surface layer was conducted by the following method. Prepared samples of rubber area of 8 cm2and they applied the test polymer composition and the polyamide pile. The samples were placed in glass test surface and is covered over the entire area of rubber with a metal plate on which stavins block. One end of the thread attached to the metal plate, clamping rubber sample, and on the other end hung bowl, which was placed the weights for measuring the shearing forces of the rubber pattern on the glass.

Controlling the magnitude of the shearing forces was defined as the amount of cargo in the bowl, which was the shift of the sample of rubber and its uniform motion in a glass.

The results of the force measurement shear samples, depending on the efforts of the clamp for different polymer compositions and pile are given in table 1.

Sample 3 was prepared in accordance with THE 38.105257-89.

Visually under the microscope were used to assess the adhesion of the polymer compositions to the surface of the rubber by scraping with a scalpel (with a needle). Before observation under a microscope rubber plate area of 8 cm2(4 x 2 x 0.2 cm) coated with a polymer film was exposed to a relative elongation of 100%.

Analysis of the data table. 1 shows a smaller shear for sample 9 in comparison with the other tested samples.

Prepared as described in example 4, various examples of polymer compositions (see table. 2). The results of the tests are presented in table. 3.

238-42 wt.% and additionally aminopropyltriethoxysilane, phthalic anhydride and acetoacetic ester in the following ratio, wt.%:

-Aminopropyltriethoxysilane - 60-65

Phthalic anhydride - 4-8

Acetoacetic ether - 8-12

Ethyl silicate with the content of SiO238-42 wt.% - 15-28explaining your

 

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