RU2210648C1 - Heat-resistant material manufacture method - Google Patents

Abstract

FIELD: heat-protection materials. SUBSTANCE: two-layer coating is formed on fabric substrate by applying siliconorganic rubber-based composition followed by drying of each layer of coating. Utilized fabric is made from extra-strong fibers, breaking strength of fabric being at least 1000 N for warp, and at least 800 N for shute, and surface density of fabric being at least 100 g/sq.m, preferably 100-170 g/sq.m. Composition is supplemented by silica powder and hardener. Coating layers are dried at 170-220 C. Internal layer, adjoining substrate and representing 40-75% of the total coating weight, has density 30-70 g/sq.m and outside layer, adjoining internal one and representing 25-60% of the total coating weight, has density 25-45 g/sq.m. For manufacture of material, silicon-organic rubbers are used characterized by working temperature range from -50 C to +250 C and viscosity at least 16000 vPa. s. EFFECT: increased strength, fire and frost resistances, and waterproofness. 5 cl, 1 tbl, 4 ex

Description

 The invention relates to light industry and relates to a method for producing flame retardant material.

 A known method for producing a multilayer fire-resistant material by applying a two-layer coating on the woven substrate based on plasticized polyvinyl chloride (PVC) containing a mixture of antimony trioxide and a halogen-containing flame retardant (A.S. USSR 963886, D 06 N 3/00, dated 03.10.1983). In a known method, the inner layer is obtained by applying a composition containing 100 wt. including polyvinyl chloride 1 to 20 parts by weight antimony trioxide and 19-80 parts by weight halogen-containing flame retardant. The outer coating layer is obtained from a composition containing 100 parts by weight of polyvinyl chloride 9 - 29 parts by weight antimony trioxide and 1 to 10 parts by weight halogen-containing flame retardant.

 A disadvantage of the known solution is the presence of flame retardant migration to the surface of the product, which contributes to a decrease in the content of flame retardants in the product and ultimately leads to a decrease in the fire resistance of the material during operation under high temperature conditions.

A solution is known aimed at blocking the migration of the flame retardant composition and increasing the fire resistance of the material (RF Patent 2148116, D 06 N 3/00, 1999). The objective of the known invention is solved due to the fact that a halogen-containing flame retardant is additionally introduced into the flame retardant composition in the following ratio of components (wt.%):
2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane - 63 - 67
Antimony trioxide - 24 - 26
Epoxy Oligomer - 9 - 11
when the mass ratio of PVC and antipyretic composition 100: 5 100: 30
or
halogen-containing flame retardant has the following ratio of components, wt.%:
Decabromodiphenyl oxide - 40 - 44
Antimony trioxide - 12-14
Aluminum hydroxide - 26 - 28
Epoxy Oligomer - 17 - 19
with a mass ratio of PVC and antipyretic composition of 100: 5 - 100: 30.

 The disadvantage of the above solutions is the presence of harmful components (antimony trioxide, lead stabilizer, epoxy oligomer, etc.) in the compositions intended for coating.

It should be noted that the coatings in the known solutions do not have stable properties when exposed to high temperatures (more than 200 ^o C), because PVC decomposes under these conditions with the release of Hcl. The latter catalytically accelerates the decomposition of the polymer.

A solution is known (FR 02757546, D 06 N 3/12, publ. 06/26/98), according to which a fabric with a weak weave that does not have the necessary tightness and heat resistance is applied with a silicone coating in at least 2 layers. The density of the layers is selected from the condition of ensuring satisfactory thermal protection of the fabric. The resulting material (light and waterproof) is used for the manufacture of inflatable rescue bags. The density of the silicone coating does not exceed 70 g / m ² .

 The solution disclosed in FR 02757546, by the number of essential features is the closest to the claimed and selected as a prototype.

 The known solution has a limited scope because it does not have high fire resistance and antiwear properties. A weakly woven base fabric cannot withstand open flames and pressure under the pressure of a water jet and other means under extreme fire extinguishing conditions.

The objective of the invention is the creation of a technology for the manufacture of fire-resistant material with high strength properties, fire resistance, frost resistance and water resistance. The specified combination of properties allows the use of new material (products from it) in extreme fire extinguishing conditions, as well as long-term storage in harsh climatic conditions (with a wide temperature range in the range (-50) - (+50) ^o С) without reducing operational properties. Thus, it is possible to use the material in the temperature range (-50) ÷ (+350) ^o С and, accordingly, expand the range of its use.

The technical result is achieved by the fact that in the method of manufacturing a fire-resistant material by forming a two-layer coating on a fabric substrate when applying a composition based on silicone rubber with subsequent drying of each coating layer, a fabric made of extra-strong fibers is used as a substrate, the tensile strength of which is based on at least 1000 N, and for ducks - at least 800 N with a surface density of at least 100 g / m ² , preferably 100-170 g / m ² , aerosil and hardener are additionally introduced into the composition when the blowing ratio of components, parts by weight:
Silicone Rubber - 100
Aerosil - 3.0 - 5.0
Hardener - 2.0 - 5.0
and the coating layers are dried at a temperature of 170 ÷ 220 ^o C, while the inner coating layer adjacent to the substrate and constituting 40-75 wt.% of the entire coating is formed with a density of 30-70 g / m ² and the outer layer adjacent to the inner and constituting 25-60 wt.% of the total coating, form with a density of 25-45 g / m ² .

For the manufacture of the material using organosilicon rubbers having a range of operating temperatures (-50) ÷ (+250) ^o C, and a viscosity of not less than 16000 MPa • s, their specific electrical conductivity is usually not less than 10 ¹² cm, for example:
1. KS-5 TU 381103483-80.

 2. PPO TU 2252-043-05808020-99.

As hardeners, any known suitable hardeners may be used. The most technologically advanced for the proposed method are the following hardeners: methyltriacetoxysilane or ethyltriacetoxysilane or a mixture of methyltriacetoxysilane and ethyltriacetoxysilane taken in a ratio of 1: 1, in the amount of 4.0 to 5.0 wt.h. or methyltriacetoxysilane with the addition of tin at a ratio of 100 wt. including methyltriacetoxoxylan 4.7-7.4 parts by weight tin, in an amount of 2.0 to 4.0 parts by weight, for example, the following hardeners:
1. K-10C ethyltriacetoxysilane TU 6-02-874-79.

 2. Hardener 3187 by Bayer.

 3. Methyltriacetoxysilane - Hardener 3312 firm Bayer.

4. Methyltriacetoxysilane with the addition of tin at a ratio of 100 parts by weight methyltriacetoxysilane 4.7-7.4 parts by weight Bayer tin, grades C ₁ and C ₂ .

 It is possible to use the specified composition with hydrated alumina in an amount of 3.0-10.0 wt.h dispersion 160-190 microns.

The specified requirements for the substrate fabric are met, for example, by the following fabrics:
1. Extra-strong technical fabric made from CBM thread in accordance with TU 8378-014-31094986-97.

 2. Extra-strong technical fabric from CBM threads and aramid fibers in accordance with TU 8378-014-31094986-97.

 3. The fabric is technical extra-strong from aramid thread TU 8378-014-31094986-97.

 4. Technical fabric from aramid threads "Rucap O" TU 6-12-05763369-27-93.

 5. Tagelen - Terlon fabric TU-17-404-92.

 6. Technical fabric from cottage cheese yarn - Teosar and other fabrics.

 Used threads and bundles comply with GOST 28007-88.

 The fabrics indicated under 5, 6 are expensive, so it is currently preferable to use the fabrics indicated under 1-4.

 It is possible to use other durable fabrics that meet the above requirements.

 The invention is illustrated by the following examples.

Example 1
Twill weaving fabric from CBM threads corresponding to GOST 28007-88, 29.4 tex in warp and weft, with a density of 108 g / m ² , strength of 1450 N in warp and 1020 N in weft, was heat treated in a chamber at T = 200 ± 20 ^o C to remove the sizing. Further, a two-layer coating was applied to the fabric using a polymer composition of the following composition, parts by weight:
PPO Rubber Soprene Rubber - 100
Aerosil, A300 - 3.0
Alumina hydrate with a dispersion of 460-190 microns - 3.0
Bayer Methyltriacetoxysilane 3312 - 4.5
The specified composition was previously prepared by mixing these components at T ^o room. to obtain a homogeneous mass, and applied it on a tissue substrate layer by layer on a doctor blade in the following sequence:
- Application of the inner layer adjacent to the fabric, with a density of 50 g / m ² (64% of the total coating weight). The speed of movement of the fabric base is 3-5 m / s.

- Drying the resulting coating at T = 170-180 ^o With subsequent cooling to T ^o room.

- Application of the outer layer adjacent to the inner one under the same conditions as the inner one. The density of the outer layer is 30 g / m ² (36% of the coating weight). Application speed 2-4 m / s.

- Drying the resulting coating at T = 200-220 ^o With subsequent cooling to T ^o room.

Example 2
A material with a two-layer coating was obtained by the method described in Example 1, with a change in the fabric substrate and the composition of the composition for coating:
1. Aramid yarn weaving fabric, corresponding to TU 8378-014-31094986-97, 29.4 tex in weft, 58.8 tex in warp, with a density of 126 g / m ² , strength 1406 N per warp and 980 N per thread.

2. To obtain the coating used a composition of the following composition, parts by weight:
Silicone rubber KS-5 - 100
Aerosil A-300 - 4.0
Alumina hydrate with a fineness of 460-190 microns - 6.0
Ethyltriacetoxysilane 3034 l. Bayer - 4.0
The density of the inner coating layer is 60 g / m ² (63% of the coating weight). Application speed 2-4 m / s.

The outer layer with a density of 35 g / m ² (37% of the coating weight).

Example 3
The material was obtained in accordance with Example 1 with a change in the composition of the composition for coating:
1. For coating used a composition of the following composition, parts by weight:
Siloprene rubber E-18 - 100
Aerosil A-300 - 5.0
A mixture of methyltriacetoxysilane and ethyltriacetoxysilane, taken in a ratio of 1: 1, - 4.0
The density of the inner coating layer is 66.5 g / m ² (70% of the coating weight). The outer layer with a density of 28.5 g / m ² (30% of the coating weight).

Example 4
The material was obtained in accordance with Example 1 with a change in the tissue substrate and the composition of the composition for coating:
1. Blended fabric from aramid yarn "Rusar O", TU 6-12-05763369-27-93, and aramid yarn, TU 8378-014-31094986-97, 29.4 tex based and 40 tex duck, density 110 g / m ² , strength 1480 N on the basis and 1100 N on the weft.

2. For coating used the composition of the following composition, parts by weight:
Siloprene rubber E-18 - 100
Aerosil A-300 - 5.0
Alumina hydrate with a fineness of 160-190 microns - 10.0
Methyltriacetoxysilane with the addition of tin at a ratio of 100 parts by weight of methyltriacetoxysilane 7.4 wt.h. tin - 3.0
The density of the inner coating layer is 55 g / m ² (64.7% of the coating weight). The outer layer with a density of 30 g / m ² (35.3% of the coating weight).

Example 5
The material was obtained in accordance with Example 1 with a change in the tissue substrate and the composition of the composition for coating:
1. Tegelon-terlon mixed fabric, TU-17-404-92, 29.4 tex on the basis and 58.8 tex on the weft, with a density of 160 g / m ² , strength 1300 N on the basis and 900 N on the weft.

2. For coating used the composition of the following composition, parts by weight:
Siloprene rubber E-18 - 100
Aerosil A-300 - 5.0
Alumina hydrate with a fineness of 160-190 microns - 10.0
Methyltriacetoxysilane with the addition of tin at a ratio of 100 parts by weight methyltriacetoxysilane 7.4 parts by weight tin - 3.0
The density of the inner coating layer is 55 g / m ² (64.7% of the coating weight). The outer layer with a density of 30 g / m ² (35.3% of the coating weight).

 The properties of the material obtained in accordance with the claimed invention are presented in the table.

 The results presented in the table indicate that when sequentially applying to a fabric made of extra-strong fibers two layers of a coating of a composition based on silicone rubber, according to the invention, a high level of strength is achieved, 1.3-1.4 times higher than the requirements regulatory documents (see p. 1, 2 tables): fire resistance - 1.2 times, water resistance - 2 times (paragraph 3 of the table), while maintaining a high level of wear resistance. The indicated properties of the new material can significantly expand the range of its application.

Claims (5)

1. A method of manufacturing a fire-resistant material by forming a two-layer coating on a fabric substrate when applying a composition based on silicone rubber with subsequent drying of each coating layer, characterized in that the fabric is made of extra-strong fibers, the tensile strength of which is based on at least 1000N and for weft not less than 800 N with a surface density of not less than 100 g / m ² , into a composition based on silicon-organic rubber with a range of operating temperatures in the range of (-50) ÷ (+250) ^o С and viscous with a minimum of 16,000 mPa • s, aerosil and hardener are additionally introduced in the following ratio of components, wt. hours:
Organosilicon rubber with a range of operating temperatures in the range -50 ^o С ÷ +250 ^o С and a viscosity of at least 16000 m Pa • s - 100
Aerosil - 3.0-5.0
Hardener - 2.0-5.0
and the coating layers are dried at a temperature of 170 ÷ 220 ^o C, while the inner coating layer adjacent to the substrate and comprising 40-75 wt. % of the total coating is formed with a density of 30-70 g / m ² and the outer layer adjacent to the inner one and comprising 25-60 wt. % of the total coating is formed with a density of 25-45 g / m ² . 2. A method of manufacturing a fire-resistant material according to claim 1, characterized in that a fabric with a surface density of 100-170 g / m ^{2 is} used as a substrate.  3. A method of manufacturing a fire-resistant material according to claim 1 or 2, characterized in that the composition for forming a coating further comprises aluminum oxide hydrate with a particle size of 160-190 microns in an amount of 3.0-10 wt. h  4. A method of manufacturing a flame retardant material according to any one of paragraphs. 1-3, characterized in that as the hardener use methyltriacetoxysilane, or ethyltriacetoxysilane, or a mixture of methyltriacetoxysilane and ethyltriacetoxysilane taken in a ratio of 1: 1, in the amount of 4.0-5.0 wt. h  5. A method of manufacturing a fire-resistant material according to claim 4, characterized in that methyltriacetoxysilane with the addition of tin is used as a hardener in a ratio of 100 wt. including methyltriacetoxysilane 4.7-7.4 wt. including tin in an amount of 2.0-4.0 wt. h

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