The sealing composition

 

(57) Abstract:

The invention relates to the field of production of two-component compounds with increased strength and can be used to seal the membrane elements. The effect is achieved that the polyurethane compound comprising isocyanate component, the hydroxyl-containing component and the catalyst, as the isocyanate component used is a prepolymer based on 4,4'-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol m 200 m and 2000 in the ratio 61,5 : 5,80 : 8,30-80,0 : 18,0 : 29,1. As hydroxyl-containing component is a mixture of polyoxy of propylene glycols m 1000 m and 2000 and nitrogen polyester m 200 m in the ratio: 0,01 : 0,01 : 1,40-73,60 : 75,00 : 31,00. As the catalyst - dibutylthiourea tin, in the following ratio of components, wt.h.

Hydroxyl-containing component 1

Isocyanate component - 0,80-1,22

Catalyst - 0,013-0,016 n

The invention relates to the production of two compounds based on polyurethane and can be used to seal the membrane elements, including medical devices, as well as other purposes.

Famous PU-compound-based forpremium oil or a mixture of trimethylolpropane with a ratio of CO:IT 1-1,6-1.

However, the composition has a long curing time of 1 h at 20oC and 0.5 h at 50oC.

The closest to the invention is a sealing composition comprising a urethane prepolymer, liquid divinely rubber with terminal hydroxyl groups and a catalyst.

Urethane prepolymer based on deviceloop rubber contains 2.8 to 4.2% of the isocyanate groups.

Curing of the composition occurs in the presence of triethanolamine.

The disadvantage of the sealing composition is not sufficiently high strength (table, example 1), which does not allow its use for sealing membrane elements operating at high pressure filtered liquid (in particular ultrafiltration water purification).

This invention is directed to receive sealant composition with increased strength for sealing membrane elements for various applications, including medical.

The effect is achieved that the sealing composition including a urethane prepolymer, a hydroxyl-containing component and the catalyst, as the urethane prepolymer contains a prepolymer based on 4,4-diphenyl is 8 8,3 80,8 18 29,1, as hydroxyl-containing component is a mixture of polyoxypropyleneglycol mol. m 1000 and 2000, respectively, and ethoxylated Ethylenediamine mol. m 200 at a ratio (wt.h.) 0,01 0,01 1,4 73,6 75,0 31,0 respectively, as catalyst dibutyltindilaurate tin in the following ratio of the components of the composition (wt.h.):

A prepolymer based on 4,4-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol mol. m 200 and 2000 0,8 1,22

A mixture of polyoxypropyleneglycol mol. m 1000 and 2000 ethoxylated Ethylenediamine mol. m 200 1,0

Dibutyltindilaurate tin 0,013 0,016

Use in sealing compositions of prepolymer based on 4,4-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol different weights and hydroxyl-containing component in the form of a mixture of polyoxypropyleneglycol different molecular weight and nitrogen-containing polyester can improve the durability of the sealing compositions, without significant changes in other properties. This increase in strength is achieved by the fact that the aforementioned ratio of components allows to synthesize polyurethane polymer with a certain ratio of flexible and rigid units in the macromolecule.

As raw materials for po THE 6205

Laprol 202 THE 6-05-221-826-86

Lupranol 294 THE 6-05-1881-80

4,4-Diphenylmethanediisocyanate THE 113-03-604-86

For experimental verification of the claimed sealing compositions were prepared 14 formulations (table).

To obtain samples of the sealant composition was mixed prepolymer, a hydroxyl-containing component was added to the catalyst in the amount of 0.015 wt. including cast samples sealing compositions by the method of centrifugal casting.

The strength of the samples was determined by the tensile strength according to GOST 270-75, also was determined elongation at break according to GOST 270-75 and hardness shore a according to GOST 263-75.

Example 1 corresponds to the prototype.

Example 2 corresponds to the minimum content of 4,4 MDI in the system.

Example 3 corresponds to the maximum content of 4,4 MDI in the system.

Example 4 corresponds to the minimum content of polyoxypropyleneglycol mol.m. 200 in the prepolymer.

Example 5 corresponds to the maximum content POPG mol.m. 200 in the prepolymer.

Example 6 corresponds to the minimum content POPG mol.m. 2000 prepolymer.

Example 7 corresponds to the maximum content POPG mol.m. 2000 meets isocyanate index 6 in the prepolymer.

Example 10 corresponds to the composition which is hydroxylation component is missing POPG mol.m. 1000.

Example 11 corresponds to the maximum content POPG mol.m. 1000 in hydroxylation component.

Example 12 corresponds to the composition which is hydroxylation component is missing POPG mol.m. 2000.

Example 13 corresponds to the maximum content POPG mol.m. 2000 hydroxylation component.

Example 14 corresponds to the minimum content of nitrogen-containing polyester mol.m. 200 hydroxylation component.

Example 15 corresponds to the maximum content of nitrogen-containing polyester mol.m. 200 hydroxylation component.

The sealing properties of the composition given in the table.

A sealing composition comprising a urethane prepolymer, a hydroxyl-containing component and a catalyst, characterized in that as the urethane prepolymer contains a prepolymer based on 4,4'-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol mol.m. 200 and 20,000, respectively, at a ratio (wt.h.) accordingly 61,5 5,8 8,3 80,8 18 29,1, as the hydroxyl-containing component is a mixture of reproach (wt.h.) 0,01 0,01 1,4 73,6 75,0 31,0 respectively, as the catalyst - dibutylthiourea tin in the following ratio of the components of the composition, wt.h.

A prepolymer based on 4,4'-diphenylmethanediisocyanate and mixtures of polyoxypropyleneglycol mol.m. 200 and 2000 0,8 1,22

A mixture of polyoxypropyleneglycol mol.m. 1000 and 2000 and ethoxylated Ethylenediamine mol.m. 200 1

Dibutyltindilaurate tin 0,013 0,016$

 

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15 cl, 2 ex

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8 cl, 12 ex

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EFFECT: improved preparing method.

5 cl, 1 tbl, 2 ex

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