RU2615378C1 - Rubber mixture for manufacturing acoustic coatings - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: rubber composition for the manufacture of acoustic coatings includes parts by weight of synthetic rubber epichlorohydrin - 70.0, -80.0; synthetic rubber, propylene oxide - 20.0-30.0; sulfur - 2.0-3.0; thiuram D - and kaptaks 2.0-3.0 - 0.5-1.5; zinc oxide - magnesium and 3.0-5.0 - 2.0-3.0; stearic acid - 1.0-1.5; active carbon black N 220 - 30.0-35.0; plasticiser - dibutyl - 3.0-5.0; softener - Industrial oil I-12A - 25.0-35.0; sorbitan monostearate technological additive - 1.0-2.0; polymer filler trans polynorbornene - 20.0-25.0.

EFFECT: invention can improve the processing properties of the moulding, to increase the effect of sonar protivogidrolokatsionny special multi-layer coating structure, made of a rubber mixture.

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Description

The invention relates to the rubber industry and can be used in the production of multilayer, perforated large-sized soundproof polymer coatings, the use of which reduces the levels of primary and secondary acoustic fields of the protected object located in water when exposed to hydraulic pressure.

The rubber mixture for the manufacture of acoustic coatings includes the following rubbers and ingredients: synthetic epichlorohydrin rubber (SKEHG-ST), synthetic propylene oxide rubber (SKPO), vulcanizing agent - sulfur, vulcanization accelerators - tetramethylthiuramdisulfide (thiuram D) and 2-mercaptoltases vulcanization - zinc and magnesium oxides, technological additive and vulcanization activator - stearic acid, filler - active carbon black, plasticizer - dibutyl phthalate, softener - oil industry And noe-12A, technological additive - sorbitan monostearate, a polymeric filler - trans polynorbornene.

A rubber mixture is known based on the composition of a triple copolymer of epichlorohydrin with ethylene oxide and allyl glycidyl ether of the Hydrin T 3000 brand, including a vulcanizing agent — sulfur, vulcanization accelerators — Captax and Tiuram D, vulcanization activators — zinc oxide and magnesium oxide, and filler — carbon black P 324 and stearins acid (Rumyantseva A.V., Klochkov V.I., Kurlyand S.K., et al. Structure and properties of rubbers based on organic oxides // Young Scientist. 2014. No. 14-1. P. 39-44). The specified rubber mixture is used for the manufacture of molded rubber products in oil-petrol-resistant design.

The disadvantage of the rubber compound is its low tensile strength at break and low soundproofing performance.

The closest in technical essence (prototype) is the rubber mixture described in the patent for the invention (RU 2 258718 C1) for the manufacture of an acoustic coating, comprising the following components, wt. hours: cis-isoprene rubber SKI-3 - 100, a vulcanizing group containing tiuram - 1.5-2.0, altax - 1.5-2.0, captax - 1.2-1.5, antioxidant Naftam- 2 - 1.2-1.5, zinc oxide - 10-12, filler - carbon black T 900 - 12-20 and stearic acid - 1.5-2.0. The disadvantage of this rubber is its low anti-sonar effect.

The objective of the present invention is to develop a rubber compounding for the manufacture of acoustic coatings with improved technological properties during molding and with high sound-proofing performance at specified frequency ranges, hydraulic pressure and effective reflection coefficient.

EFFECT: increased anti-sonar effect of a hydroacoustic multilayer coating of a special design (plate) made of a rubber mixture based on special rubbers with the addition of sorbitan monostearate and trans-polynorbornene.

The task is achieved by the selection of certain rubbers and special ingredients in the optimal ratio, wt. h:

epichlorohydrin rubber 70.0-80.0 propylene oxide rubber 20.0-30.0 sulfur 2.0-3.0 captax 0.5-1.5 tiuram D 2.0-3.0 zinc oxide 3.0-5.0 magnesium oxide 2.0-3.0 stearic acid 1.0-1.5 carbon black N 220 30.0-35.0 dibutyl phthalate 3.0-5.0 industrial oil I-12A 25.0-35.0 sorbitan monostearate 1.0-2.0 trans polynorbornene 20.0-25.0

New in the invention is a previously unused combination of known ingredients used in a similar proportion, and not used in the formulation of a rubber mixture of a polymer filler - trans-polynorbornene. This allows you to obtain the necessary technical result: improved manufacturability during molding and increased anti-sonar effect of sonar coating. Distinctive features of the claimed invention are additional ingredients of the rubber compound with the use of technological additives sorbitan monostearate and a polymer filler - trans-polynorbornene.

Trans-polynorbornene is an open chain polymer (molecular weight greater than 200,000) obtained by polymerization of norbornene, which is similar in structure and properties to polydienes. During the polymerization of norbornene, it has the form of an amorphous polymer (the catalyst is tungsten compounds, 80 ° C, 4 hours).

Trans-polynorbornene is a granular white powder, combines well and vulcanizes with propylene oxide and epichlorohydrin rubbers, gives vulcanizates increased elasticity, resistance to abrasion, tearing and thermal aging. Due to the ability to orientational crystallization, increasing the degree of filling with carbon black and plasticizers has little effect on the basic elastic strength characteristics.

The direct introduction of powdered trans-polynorbornene into the rubber mixture, without preliminary technological refinement, does not create the necessary conditions for achieving a technical result due to the lack of combining it with the rubber matrix. To eliminate this drawback, powdered trans-polynorbornene in a combination of plasticizers is swollen (industrial oil grade I-12A and dibutyl phthalate) at a mass ratio: trans-polynorbornene: industrial oil grade I-12A: dibutyl phthalate = 1: 4: 0.5 by exposure to within 24 hours at room temperature in a special container with a mixing device. The rubber-like (swollen) trans-polynorbornene obtained as a result of swelling in plasticizers is used to make the uterine rubber mixture.

According to the applicants, this rubber compound is unknown and it can be concluded that the invention meets the condition of patentability “novelty”.

Since the claimed combination of essential features exhibits new properties that make it possible to obtain a change in the quantitative measure of the result, namely, a decrease in the levels of the primary and secondary acoustic fields of the protected object located in water when exposed to hydraulic pressure, compared with the known rubber, we can conclude that the invention patentability condition “inventive step”.

The rubber mixture was prepared in laboratory conditions by mixing all the recipe components with rubbers on rollers LB 320/150/150, and under production conditions - in an Intermix SKI-50L rubber mixer. The manufacturing mode of the rubber mixture in the rubber mixer "Intermix SKI-50L":

1. The introduction of rubbers, 0.5 parts of carbon black H 220, swollen trans-polynorbornene and sorbitan monostearate.

2. The introduction of Captax, zinc and magnesium oxides, stearic acid, 0.5 parts of carbon black H 220, the input of sulfur, tiuram.

Mixing time is 20-25 minutes.

The inventive rubber compound is made of the following materials:

- epichlorohydrin rubber (TU 2294-049-16818126-99);

- propylene oxide rubber (TU 2294-067-16810126-2003);

- sulfur (GOST 127.2-93);

- captax (GOST 739-94); Tiuram D (GOST 740-76);

- zinc oxide (GOST 202-84);

- magnesium oxide (GOST 844-79);

- stearic acid (GOST 6484-96);

- carbon black N 220 (GOST 7885-86);

- dibutyl phthalate (GOST 8728-98);

- industrial oil I-12A (GOST 20799-88);

- sorbitan monostearate (GOST 32770-2014);

- trans-polynorbornene (Astron Industriebeteiligungs GmbH, Austria).

In the proposed rubber composition can be used analogues of rubbers and ingredients produced by various companies.

Options investigated compounds of rubber compounds are given in table. one

Physico-mechanical properties of rubber compounds are given in table. 2

Sound insulation and sound reflection performance are determined in arbitrary units using a special technique using a sonar measuring tube, which includes a sonar waveguide filled with water, at the end of which there is a loading chamber in communication with a source of compressed air. The test sample and the receiving-emitting system are placed in the waveguide. To simulate the load of the samples with the acoustic resistance of the aquatic environment in a closed volume of a sonar pipe under pressure (when measuring the efficiency of sound reflection), and also to create a traveling sound wave mode (when measuring sound insulation), an absorber is installed at the upper end of the water column sound energy made of rubber-like material.

An analysis of the data shown in Table 2 shows that a new formulation of a rubber mixture based on epichlorohydrin and propylene oxide rubbers containing sorbitan monostearate and a previously not used polymer filler of trans-polynorbornene has better results in all main indicators, and taking into account experimental experimental work provides a significant reduction in the levels of primary and secondary acoustic fields of the protected object located in water when exposed to hydraulic pressure.

In view of the foregoing, in the applicant's opinion, the invention meets the patentability condition “industrial applicability”.

Claims (2)

A rubber mixture for the manufacture of acoustic coatings, characterized in that it includes epichlorohydrin rubber, propylene oxide rubber, sulfur, captax, thiuram D, zinc oxide, magnesium oxide, stearic acid, carbon black H 220, dibutyl phthalate, industrial oil I-12A, sorbitan monostearate, trans-polynorbornene, with the following ratio of components, wt. hours:  epichlorohydrin rubber 70.0-80.0  propylene oxide rubber 20.0-30.0  sulfur 2.0-3.0  captax 0.5-1.5  tiuram D 2.0-3.0  zinc oxide 3.0-5.0  magnesium oxide 2.0-3.0  stearic acid 1.0-1.5  carbon black N 220 30.0-35.0  dibutyl phthalate 3.0-5.0  industrial oil I-12A 25.0-35.0  sorbitan monostearate 1.0-2.0 trans polynorbornene 20.0-25.0