Strengthening polyurethane composition

FIELD: construction.

SUBSTANCE: composition contains the following components, wt %: 74.42-83.63 - hydroxyl-containing polybutadiene rubber SKD-GTRA, 1.63-2.11 - 1.4-butanediol, 0.07-0.09 - trimethylolpropane, 4.76-13.04 - transformer oil, 8.90-11.53 - hexamethylenediisocyanate, 0.5-5.0 - technical carbon (over 100%), 0.02-0.03 - dibutyldilaurate of tin (over 100%).

EFFECT: reduced viscosity of strengthening polyurethane composition, its increased pot life, provision of technological process, higher hydrolytic and chemical resistance, provision of hardening temperature within the limits and high physical-mechanical properties.

4 ex, 1 tbl

 

The invention relates to securing polyurethane compositions intended for the booking and bonding booked a charge of solid propellant (TRT) to the housing of the gas generator (GG), precluding longitudinal movement of charge in the housing GG.

Known fastening structure according to the patent of the Russian Federation 2264427, CL 09J 175/04, 109/00 for manufacturing brush-type. This composition has a high mechanical, adhesive characteristics and low temperature embrittlement. The disadvantages of this holding structure is a relatively high temperature curing (80°C), the lack of viability (20 minutes), the relatively high initial viscosity of 30 PA·s, impairing bond of the booked charge with the case).

Closest to the proposed invention the technical essence is bystrotverdeyuschie polyurethane composition to bond the fuel cell at one end with the case of starting the engine by the injection method is the reaction of forming the RF patent 2167903, CL 09J 175/04, 109/00 prototype containing hydroxyl-containing polybutadiene rubber SKD-GTR, isocyanate curing agent is 4,4'-diphenylmethanediisocyanate, curing catalyst - dibutylthiourea tin, chain extension - 1,4-butanediol, a crosslinking agent - trimethylolpropane, plasticizer - transformational, the filler is zinc oxide. The disadvantage of this bystrotverdeyushchego polyurethane composition is complete unfitness for fastening charge TRT housing BIENNIUM by the method of filling and displacement as a result of very low viability (30-40 s).

The technical problem of the invention is to reduce the viscosity of the fastening polyurethane composition, improving its viability to ensure the technological process, improving its hydrolytic and chemical resistance, as well as providing temperature curing in the range 15-35°C and high physical-mechanical characteristics.

The technical result is achieved in that the securing polyurethane composition includes a hydroxyl-containing polybutadiene rubber SKD-GTR, 1,4-butanediol, trimethylolpropane, transformer oil, dibutylthiourea tin, isocyanate curing agent and a filler, as a hardener contains hexamethylenediisocyanate, as filler - carbon technical in the following ratio, wt.%:

- hydroxyl-containing polybutadiene rubber
SKD-GTR74,42-83,63
- 1,4-butanediol 1,63-2,11
- trimethylolpropane0,07-0,09
- transformer oil4,76-13,04
- hexamethylenediisocyanate8,90-11,53
- carbon technical (over 100%)0,5-5,0
- dibutylthiourea tin (over 100%)0,02-0,03

In securing the polyurethane composition includes a hydroxyl-containing polybutadiene rubber SKD-HTRA (TU 38.103315-86) with terminal hydroxyl groups, which allows you to get fit for booking and bonding the booked charge TRT housing GG secures the polyurethane composition with satisfactory mechanical characteristics, high hydrolytic and chemical resistance. High elastic parameters (elongation at break) securing the cured polyurethane composition ensures the chain extension of 1,4-butanediol (TU 6-14-59-90) and a crosslinking agent - trimethylolpropane (TU 38.102101-76). Improvement of technological properties securing the polyurethane composition (decrease in viscosity, increase vitality) is achieved by introducing a relatively large number (up to 13 wt.%) transformer oil (the OST 10121-76) without deterioration of physical and mechanical characteristics. The required mechanical characteristics (tensile strength) securing the cured polyurethane composition are provided by the use of filler - carbon technical (GOST 7885-86). We offer secure polyurethane composition cures at a temperature of 15-35°C in the reaction with hexamethylenediisocyanate (TU 113-03-38-104-90). When cooking secures the polyurethane composition is applied, the stoichiometric ratio of the reactive groups (NCO-groups of the hardener and Oh-groups of the hydroxyl-containing components) with a slight excess of isocyanate. Optimal properties securing the polyurethane composition were achieved with a ratio of NCO/OH=1.0 mol/0.95 mol. The use of ORGANOMETALLIC curing catalyst - dibutylthiourea tin (TU 6-02-1-001-88 or THE 6-02-1-002-88) provides for the regulation of technological characteristics (pot life, curing time) secures the polyurethane composition.

Example 1.

In mestel equipped with a stirrer and heated sequentially load 81,50 wt.% rubber SKD-GTR, 2,11 wt.% 1,4-butanediol, and 0.09 wt.% of trimethylolpropane, was 4.76 wt.% transformer oil, 0.02 wt.% in excess of 100% dibutyltindilaurate tin, 1.0% carbon technical, thoroughly mixed with a spatula by hand until complete wetting of the carbon technical, then mix with a mixer without the Vake the mA for 15 minutes at a temperature of 85±5°C, next vacuum for 30 minutes at a temperature of 85±5°C) and pressures (minus 0.9 - minus 1) kgf/see the Mixture with continuous stirring and vacuum cooled to a temperature of 15±5°C, then download 11,53 wt.% hexamethylenediisocyanate and mix thoroughly and vacuum at the temperature of 15±5°C) and pressures (minus 0.9 - minus 1) kgf/cm2within 3-5 minutes. Ready to secure the polyurethane composition discharged into the supply tank, pour in the camera GG and immerse booked a charge of TRT in a case with a secure polyurethane composition, turn around the axis at least 5 times. Then using a special centering snap booked charge TRT center and presses, utverjdayut secures the polyurethane composition at a temperature of 15-35°C for at least 72 hours. After curing centering snap retrieve.

Examples 2-4 carried out analogously to example 1, but the ratio of the components specified in table 1.

Table 1
The formulation and properties of the proposed secures the polyurethane composition according to the examples and prototype
Name of indicatorValue
The placeholderExample 1Example 2Example 3Example 4
123456
Hydroxyl-containing polybutadiene rubber SKD-GTR, wt.%50,8 is 66.281.51 seen83,6376,3674,42
1,4-butanediol, wt.%1,0-1,72,111,781,631,93
Trimethylolpropane, wt.%0,1-0,50,090,080,070,08
Transformer oil, wt.%11,0-of 17.04,764,7713,0413,04
4,4'-diphenylmethanediisocyanate, wt.%10,0-13,0 ----
Hexamethylenediisocyanate, wt.%-11,539,748,910,53
Technical carbon (over 100%), wt.%-1,00,52,55,0
Zinc oxide, wt.%11,0-of 17.0---
Dibutyltindilaurate tin (over 100%), wt.%0,02-0,050,020,030,030,02

Continuation of table 1
123456
1. The tensile strength, kgf/cm at 20°C 8-40of 54.846,053,162,6
at a temperature of + 50°C-24,924,326,325,8
at a temperature of minus 50°C-78,164,672,372,9
2. Elongation at break, %
at a temperature of + 20°C150-500506765595563
at a temperature of + 50°C-344,3370,4378,1378,6
at a temperature of minus 50°C-379,4351,9 377,3312.5
3. The elastic modulus at 2%elongation, kg/cm at a temperature of + 20°C-157141153166
at a temperature of + 50°C-184137141170
at a temperature of minus 50°C-227155175230
4. Viscosity, PA·s20-2718152020
5. Viable30-4060 min55 min45 min50 min
Themperature curing, °C8015-35
Themperature vitrification, °C minus 60 to minus 80minus 83,5minus 81,0minus 79,3minus a 76.5
8. Hydrolytic resistance-When exposed to 100%humidity and a temperature of 60°C and retains its physical and mechanical characteristics over a long period of time
9. Chemical resistance-Sustainable, not depolymerized from exposure to aqueous solutions of inorganic acids.

From the data presented in table 1, it is seen that the proposed secures the polyurethane composition has a high physical-mechanical and technological characteristics in comparison with the prototype, namely:

- viscosity secures the polyurethane composition at a temperature of 20°C 15-20 PA·s, so you can use it for booking and bonding the booked charge TRT camera GT by the method of filling and displacement;

- the viability of secure polyurethane with the tava increased 90 times compared with the prototype and amounted to 40-60 minutes;

- temperature curing secures the polyurethane composition of 15-35°C, i.e. curing occurs at ambient temperature, which drastically reduces the power consumption;

the most important strength indicator - tensile strength for the proposed secures the polyurethane composition at a temperature of 20°C reaches the value 62,6 kgf/cm, which exceeds the performance of the prototype;

- elongation at break at 20°C is 506-765%that indicates a high elastic properties securing the polyurethane composition;

- high hydrolytic resistance secures the polyurethane composition is that it is resistant to moisture and high temperatures;

- secures the polyurethane composition has a high chemical resistance.

All the above allows the use of secure polyurethane composition for booking and bonding the booked charge TRT with the case of GT, while ensuring high operational reliability charge TRT in a wide temperature range within ±50°C and in humid tropical climate in the long warranty period of storage (up to 25 years).

We offer secure polyurethane composition tested with positive results when booking and the bond is a separate charge TRT with the camera, the experimental chemical plant FSUE "December".

Secures the polyurethane composition for booking and bonding booked a charge of solid propellant to the housing of the gas generator, comprising a hydroxyl-containing polybutadiene rubber SKD-GTR, 1,4-butanediol, trimethylolpropane, transformer oil, dibutylthiourea tin, characterized in that it contains as the hardener hexamethylenediisocyanate, and as filler - carbon technical in the following ratio, wt.%:

hydroxyl-containing polybutadiene
rubber SKD-GTR74,42-83,63
1,4-butanediol1,63-2,11
trimethylolpropane0,07-0,09
transformer oil4,76-13,04
hexamethylenediisocyanate8,90-11,53
technical carbon (over 100%)0,5-5,0
dibutyltindilaurate tin (over 100%)0,02-0,03



 

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1 tbl, 1 ex

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