RU2391368C1 - Modifying additive for water-based polyorganosiloxane polymer and copolymer of butadiene with styrene - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to modifying additives for making protective polymer coatings based on water-based polyorganosiloxane polymer and a copolymer of butadiene and styrene. Proposed is a modifying additive for water-based polyorganosilixane polymer and a copolymer of butadiene with styrene containing the following (in wt %): 60-70% solution of epoxyaminorubber adduct in a mixture of ethylglycolacetate and butanol, where the adduct is modified with melamineformaldehyde resin (11.0-14.0); water and additionally acetic or phosphoric acid (0.1-1.5), as well as 80% solution of diene epoxide resin (1.0-12.5) in a mixture of xylene and acetylcellosolve, taken in ratio of 5:1.

EFFECT: design of a modifying additive with high stability for not less than 6 months from the date of manufacture.

1 cl, 2 tbl

Description

The invention relates to the field of production of a modifying additive used for the manufacture of protective polymer coatings, mainly based on a water-borne polymer of polyorganansiloxane and a copolymer of butadiene with styrene. These protective coatings are applied to the cartridges of small-arms and hunting weapons for various purposes, as well as to the cartridges of construction cartridges.

A known method of applying a protective polymer coating on a cartridge sleeve (RF patent No. 2313058, IPC F42B 5/295; C23C 22/12; C23C 28/00; B21D 51/54, publ. 20.12.2007). According to this invention, a water-borne protective polymer layer is applied by treating the liner in an aqueous solution of a base polymer based on a polyorganosiloxane polymer and a copolymer of butadiene with styrene (the industrial name of this water-soluble composition: FPSM-51, (TU 2149-054-10964029-2005) and a water-borne modifier of this composition based on phenol-formaldehyde, epoxy, polyester or alkyd resins.The use of these modifiers in the FPSM-51, eliminates the "stickiness" of the coating and increase its corrosion resistance.

A known composition based on a water-borne resin VEK-M (TU 6-10-11-519-7-85), which is a 60-70% solution in a mixture of ethyl glycol acetate and butanol, partially neutralized with formic acid, an epoxyamine-rubber adduct modified with melamine-formaldehyde resin . However, a coating based on this composition requires the use of sophisticated technology for its application.

Known "Water-soluble varnish composition for coating by electrodeposition" according to the patent of Russian Federation No. 1764307, IPC C09D 119/00, C09D 5/44, publ. 06/20/1996 This lacquer composition contains a 60 ... 70% solution in a mixture of ethyl glycol acetate and butanol, partially neutralized with formic acid epoxyamino rubber adduct modified with melamine-formaldehyde resin (K-421-02), acetic acid, as well as carbon fluoride, diacetone alcohol or ethyl cellosolve and water. The disadvantages of this composition include its lack of stability during storage: 30 ... 60 days from the date of manufacture. In addition, the technology for applying this coating, namely, the electrodeposition method, is very complex and therefore of little use for the mass production of small arms cartridges.

Closest to the invention in technical essence is a water-soluble modifying additive E-MD-5a (TU225 1-01-34875572-2006) for modifying a water-soluble composition based on a polymer of polyorganansiloxane and a copolymer of butadiene with styrene in a ratio of 35:65. This modifying additive is an aqueous solution of a 60-70% solution in a mixture of ethyl glycol acetate and butanol of an epoxyamine rubber adduct modified with K-421-02 melamine-formaldehyde resin.

The disadvantages of the water-soluble modifying additive E-MD-5a include its lack of stability during storage (3 months from the date of manufacture).

The present invention was the creation of a modifying additive with high stability, at least 6 months from the date of its manufacture.

This is achieved by the fact that in the manufacture of a modifying additive for a water-borne polymer of polyorganansiloxane and a copolymer of butadiene with styrene, including a 60-70% solution of a mixture of ethyl glycol acetate and butanol, an epoxyamine-rubber adduct modified with a melamine-formaldehyde resin, and water, additionally, acetic acid or acetic acid or also an 80% solution in a mixture of xylene and ethyl cellosolve, taken in a ratio of 5: 1, diane epoxy, in the following ratio, wt.%:

60-70% solution in a mixture of ethyl glycol acetate and butanol modified epoxyamine-rubber adduct melamine formaldehyde resin 11.0 ... 14.0 acetic or phosphoric acid 0,1 ... 1,5 80% solution in a mixture of xylene and ethyl cellosolve taken in 5: 1 ratio, Diane epoxy 1,0 ... 12,5 distilled water Rest up to 100%

As a result of introducing into the composition of the modifying additive diane epoxy in the form of an 80% solution in a mixture of xylene and ethyl cellosolve, taken in a 5: 1 ratio, a modifying additive of increased stability was obtained, the use of which to modify the composition of FPSM-51 eliminates the "sticking effect" and increase the corrosion resistance of the obtained polymer coatings.

For experimental verification, a series of modifying additives was prepared; the results of eight of them are given in table No. 1. As can be seen from table No. 1, the stability of the modifying additives of the claimed composition during storage, compared with the prototype, is increased by 2 times.

In the experimental work were used:

- water-borne resin VEK-M, which is a 60-70% solution in a mixture of ethyl glycol acetate and butanol epoxyamine rubber adduct modified with melamine-formaldehyde resin K-421-02,

- acetic acid (glacial) or phosphoric acid;

- 80% solution in a mixture of xylene and ethyl cellosolve, taken in a 5: 1 ratio of diane epoxy (ED-20 or ED-16);

- distilled water.

- composition FPSM-51, which is a water-soluble polymer of organopolysiloxane and a copolymer of butadiene with styrene.

Modifying additives with different concentrations of the starting components were prepared as follows: acetic acid or phosphoric acid, 80% diane epoxy resin (ED-20 or ED-16) in a mixture of xylene and ethyl cellosolve, taken in the ratio, were added to the VEC-M water-borne resin with stirring 5: 1, and distilled water.

The storage stability of the modifier was determined by the presence of irreversible separation of the solution into “immiscible” sediment and water.

To assess the properties of protective polymer coatings, working aqueous solutions were prepared on the basis of a water-borne polymer of polyorganansiloxane and a copolymer of butadiene with styrene (FPSM-51) using modifying additives with the compositions shown in Table No. 1.

In all cases, in the preparation of working solutions (Table No. 2) the following were used: 4.0 wt.% Polymer composition FPSM-51, to which 10.0 wt.% Modifying additives, various compositions, and 86.0 wt.% Distilled water were added .

Coatings on the products were obtained from working solutions (table No. 2), by treating the products by immersion in a working solution for 2-3 minutes, followed by separation of the excess solution and curing the resulting coatings at a temperature of 200-220 ° C for 10-20 minutes .

Corrosion resistance of coatings was evaluated by continuous immersion of samples of products with a polymer coating in a 3% NaCl solution until the first signs of corrosion appear.

The continuity of the coatings was evaluated by wrapping the tested samples of products with a polymer coating in filter paper soaked in a solution of the following formulation: sodium chloride 20 g, potassium ferruginous 7.6 g, distilled water 1 liter. The exposure time is 10 minutes.

The effect of "sticking" was determined by the presence of contact of the powder particles with samples of products on which a protective polymer coating was applied.

The results of the properties of protective polymer coatings on samples of products based on a water-borne polymer of polyorganansiloxane and a copolymer of butadiene with styrene using modifying additives with the stated concentration ranges of the starting components are shown in table No. 2.

From table No. 2 it follows that only with the claimed combination of components and the ratio of the declared concentrations of the starting components increases the temporary stability of the modifying additive while maintaining the protective properties of the polymer coatings and the absence of the “sticking” effect.

Thus, it has been experimentally shown that the solution of the problem is achieved only with the claimed combination of features.

Claims (1)

Modifying additive for a water-borne polymer of polyorganansiloxane and a copolymer of butadiene with styrene, including a 60-70% solution in a mixture of ethyl glycol acetate and butanol, an epoxyamine-rubber adduct modified with a melamine-formaldehyde resin, and water, which additionally contains acetic acid or acetic acid or acetic acid 80% solution in a mixture of xylene and ethyl cellosolve, taken in a ratio of 5: 1, diane epoxy in the following ratio, wt.%:
60-70% solution in a mixture of ethyl glycol acetate and butanol modified epoxyamine-rubber adduct melamine formaldehyde resin 11.0 ... 14.0 acetic or phosphoric acid 0,1 ... 1,5 80% solution in a mixture of xylene and ethyl cellosolve taken in 5: 1 ratio, Diane epoxy 1,0 ... 12,5 distilled water rest