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Two-component polyurithane compound exhibiting a high early strength

A two-component polyurethane, polyurethane prepolymer technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of high initial strength and long processing time

Inactive Publication Date: 2006-12-20
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] No two-component polyurethane compositions have been disclosed so far which have long processing times, high green strength, fast and bubble-free curing, good adhesion and low odor during curing, which are composed of isocyanate group-containing Composition of first component A and second component B containing water and at least one polyaldimine

Method used

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  • Two-component polyurithane compound exhibiting a high early strength
  • Two-component polyurithane compound exhibiting a high early strength
  • Two-component polyurithane compound exhibiting a high early strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] Embodiment 1 (component A)

[0173] In a vacuum mixer, 3400 g of polyurethane prepolymer A1, prepared as follows: 1402 g of diisodecyl phthalate (DIDP), 14 g of p-tolylsulfonyl isocyanate (Zusatzmittel TI  , Bayer), 21g 3-glycidoxypropyltrimethoxysilane (Silquest  A-187, OSi Crompton), 1052g calcined kaolin, 1052g carbon black and 7g di-n-butyltin dichloride (1.8% in DIDP), processed to a lump-free, homogeneous Paste, and stored under the exclusion of moisture. The material has an isocyanate group content of 0.241 mmol NCO / g and a density of 1.23 g / cm 3 .

[0174] After complete curing of the first component A only by means of atmospheric moisture at 23° C. and 50% relative air humidity, it has

[0175] Shore A-hardness of 47,

[0176] The tensile strength is 7.4MPa, and

[0177] The elongation at break was 310%.

[0178] Polyurethane prepolymer A1 was prepared as follows:

[0179] 1290g polyol Acclaim  4200N, 2580g Polyol Caradol  MD34-02, 630g 4,4'-methy...

Embodiment 2 to 17

[0181] Examples 2 to 17 (Component B)

[0182] In a vacuum mixer, the components given in Tables 2a and 2b were mixed under exclusion of moisture and processed to form a lump-free homogeneous paste, which was stored under exclusion of moisture.

[0183] The density of component B of examples 2 to 17 corresponds to the density of component A of example 1, except for examples 5 and 14.

[0184] In Tables 2a and 2b, "DIDP" means diisodecyl phthalate, "DOA" means dioctyl adipate, and "kaolin" means calcined kaolin. "Tin catalyst"means a 1.8% solution of di-n-butyltin dichloride in DIDP.

[0185] "Ketimine" in Table 2b and Table 7 means polyketimine formed from 3,3,5-trimethyl-5-aminomethylcyclohexylamine (IPDA) and methyl ethyl ketone. Preparation was carried out as described in US 4108842 as "Curing Agent 1". Its ketimine content determined by amine content is 3.37mmolNH 2 / g, and has a strong pungent solvent odor.

[0186] Example

[0187] Example

[018...

Embodiment 24

[0203] Example 24 differs from Example 20 in the polyaldimines used, in which case the same aldehyde is reacted with two different polyamines. Although the different amines have no major influence on the mechanical properties of the final product, they have more influence on the development of green strength: the green strength develops significantly faster in Example 24 than in Example 20 at similar open times Construct. Both examples cured with neither bubbles nor detectable odors.

[0204] Example

[0205] "n.b." means "not determined"

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Abstract

The invention relates to a two-component compound in which the first component A comprises at lest one type of polyurethane prepolymer A1 which contains isocyanate end-groups and is produced from at least one type of polyisocyanate and the second component B which comprises water and at least one type of polyaldimine B1 and is obtainable from at least one type of polyamine PA containing aliphatic primary aminogroups and at least one type of aldehyde ALD of formula (I) or formula (II). The inventive compound is outstanding by the fact of the long processing time and high early strength thereof, a fast setting time, nevertheless without bubble formation, in particular said compound is odourless or exhibits a very low odour before, during and after thermosetting.

Description

technical field [0001] The invention relates to two-component polyurethane compositions suitable as pastse adhesives, sealants and coatings, which have long processing times, high initial strength, fast and bubble-free curing, good adhesion and Low odor, the composition consists of a first component A containing isocyanate groups and a second component B containing water and at least one polyaldimine. Background technique [0002] Polyurethane compositions are used in particular for various types of bonding, sealing and coating. It is particularly suitable for gluing or sealing where elasticity of the adhesive connection is required. Polyurethane compositions for elastic bonding are generally paste-like materials and are used as one-component or two-component systems. [0003] Adhesives that are actually suitable must have some special properties. On the one hand, a sufficiently long processing time (pot life and open time) must be ensured so that the user has enough tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/48C09J175/04
CPCC08G2190/00C08G18/12C09J175/04C08G18/3256
Inventor U·伯克哈德特S·基斯利格
Owner SIKA TECH AG
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