The composition for surface treatment of composite polymer coatings rubber and carbon-graphite basics

 

(57) Abstract:

The invention is aimed at obtaining compositions for improving operational characteristics of polymeric coatings, materials, and composites and can be used in machine-building and chemical industries. The composition for surface treatment of composite polymer coatings rubber and carbon-graphite basics before impregnation phenol resin contains from 3.0 to 5.2 wt. % of cobalt naphthenate, of 0.8-1.0 wt.% triacetonamine and 94-96 wt. % N-methylpyrrolidone. Improve the operational characteristics of rubber products with a polymer coating and increases the strength of the composite material based on carbon and graphite cloth and phenol-formaldehyde resin. table 1.

The invention relates to compositions for improving operational characteristics of polymeric coatings, materials, and composites and can find application in the chemical industry and in mechanical engineering.

There is a method for activating the surface of carbon cloth, which is the reinforcing component of the composite material, and polymer coatings on mechanical rubber goods (MRG), based on N-methylpyrrolidone and naphthenate to the s [Modern problems of mechanical engineering: materials of the scientific-technical conference./Ed. D. the so-called Professor A. C. of Shaginyan. - Gomel: GUIs. 1998. - T1. - 170 S.]. The disadvantages of this structure are the low values of compressive strength for composite materials and low bending strength of coatings on RTI.

The authors goal was to improve operational performance rubber coated and increase the strength of composite material based on carbon and graphite cloth and phenol-formaldehyde resin.

This object is achieved in that the composition for surface treatment on the basis of N-methylpyrrolidone and cobalt naphthenate additionally introduced triacetonamine, and components are taken in the following ratio, wt.%:

The cobalt naphthenate - 3,0 - 5,2

Triacetonamine - 0,8 - 1,0

N-organic - 94,0 - 96,0

In the curing process elecrodeposition coating or impregnating fabrics resins leads to the formation of intermolecular spatial relations involving structural transformations of the foaming agent or resin.

The curing agent in the coating often occurs under the influence of oxygen through different energetic effects: heat, UV - radiation, transmission elektricheskaya in two stages. In the first stage are formed of unsaturated gidroperekisi and is the isomerization of double bonds according to the scheme:

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The second is the complex chemical transformations leading to the formation of a three-dimensional grid due to oxidation polymerization:

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Regardless of the conditions of the process of film formation always strive to acceleration and holding with minimal energy costs.

Accelerators curing of coatings are salts of monobasic organic acids. So the presence of cobalt naphthenate causes the reactions leading to the acceleration of the decomposition of hydroperoxides and the formation of radicals. Introduction in a mixture of triacetonamine initiates the formation of radicals. The combined effect of cobalt naphthenate and triacetonamine leads to the formation of large amounts of spatial relations and the formation of a more developed than usual, three-dimensional polymeric structure, which in turn increases the elasticity of the coating and improves their physical and mechanical properties.

Treatment of carbon cloth proposed composition helps to reduce the wetting angle and, consequently, a more complete p the ti fabric of cobalt naphthenate and triacetonamine helps, as in the case of curing coatings, a more complete course of formation of spatial cross-linked structure of the polymer binder.

The composition is prepared by mixing the components in the specified sequence, taken according to the recipe. As can be seen from the examples and tables, the introduction of triacetonamine more than 1 wt.% or less than 0.8 wt.% not conducive to achieving this goal. Introduction less than 0.8 wt.% improves elasticity and other performance properties. The concentration of more than 1 wt.% leads to an increase in the rate of polycondensation, which reduces the cohesive strength in the volume and the formation of cracks in the coating, and the composite material.

The effectiveness of the proposed composition for treatment of coatings on the surface of RTI before heat treatment and carbon fabrics before impregnation resins is well illustrated by the following examples.

Example 1. The rubber samples, pre-medlennye chemical method, the electroplating method is applied polymer composite coating composition of composition /wt.%/:

Lac HT-0125 - 15,0

Ammonia - 2,1

PTFE suspension 4D - 25,0

PTFE suspension 4MD - 10,0

Polyvinylpyrrolidon deposition is applied composite coating composition of composition /wt.%/:

Primer FF-093 - 18,0

Ammonia - 2,4

PTFE suspension 4D - 25,0

PTFE suspension 4MD - 10,0

Polyvinylpyrrolidone - 1,0

Water Up to 100

Example 3. The rubber samples, pre-medlennye chemical method, the electroplating method is applied composite coating composition of composition /wt.%/:

Uralkaliy resin - 15,0

Ammonia - 2,4

PTFE suspension 4D - 25,0

PTFE suspension 4MD - 10,0

Polyvinylpyrrolidone - - 1,0

Water Up to 100

The deposition of all the examples is carried out at 18-25oWith the voltage 120-140 In for 120 s, then the samples are washed with running distilled water. After washing, the samples treated with the proposed solution composition / wt.%/:

The cobalt naphthenate - 3 - 5,2

Triacetonamine - 0,8 - 1

N-Organic - 94 - 96

The treatment is carried out at a temperature of 18-25oC for 1-5 min Treated samples thermoablative at a temperature of 180oWith over 40 minutes

Example 4. Of carbon and graphite cloth cut sheet size 100100 mm and process proposed composition, and then dried in air. After drying, the sheets impregnated with phenol-formaldehyde resin, are collected in the package the/P> Evaluation of the effectiveness of the proposed composition is determined by the following parameters:

- for rubber - bending strength according to WD-1, the adhesion strength of the coating to the base, anti-friction properties;

for composite material compressive strength, impact strength, anti-friction properties.

The test results presented in the table.

Thus, the proposed structure allows to increase the elasticity of the coating on the rubber and the compressive strength of a composite material based on carbon and graphite cloth and phenol-formaldehyde resin, to reduce the coefficient of friction, prolong the service life of the products. Conducted patent information search showed that this solution has novelty.

The composition for surface treatment of composite polymer coatings rubber and carbon-graphite basics before impregnation phenol resin containing N-organic naphthenate and cobalt, characterized in that it further comprises triacetonamine and components are taken in the ratio, wt.%:

The cobalt naphthenate - 3-5,2

Triacetonamine - 0,8-1

N-Organic - 94-p

 

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