Polyurethane-based composition

A composition and polyurethane technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as low reactivity, limited mechanical properties, and extrusion difficulties

Pending Publication Date: 2020-11-20
BOSTIK SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these compositions have at least one of the following disadvantages: high viscosity, difficult extrusion, low reactivity, limited mechanical properties, creep after application, etc.

Method used

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  • Polyurethane-based composition
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  • Polyurethane-based composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0331] Embodiment 1:-Preparation of NCO component:

[0332] 1.A. Preparation of polyurethane (PU) with NCO end groups :

[0333] The polyurethanes PU with NCO end groups used in the following examples were prepared using the various ingredients given in Table 1 . The amount of one or more diisocyanates and one or more polyols used (expressed as weight percent of the commercial product relative to the weight of the -NCO component) corresponds to an NCO / OH molar ratio (r1) of about 1.75, as shown in the table 1.

[0334] One or more diisocyanates and one or more polyols are mixed in a reactor at a temperature T1 of 65°C to 80°C, maintaining constant stirring and under nitrogen. The temperature was controlled to not exceed 82°C.

[0335] The entire mixture is kept mixing at this temperature until the hydroxyl functionality of the polyol is completely consumed.

[0336] The progress of the reaction was monitored by measuring the content of NCO groups by back-titration of dic...

Embodiment 2

[0343] Embodiment 2: Preparation of -OH component

[0344] The various components constituting the -OH component were mixed in the ratios shown in Table 1 at a temperature ranging from 20°C to 80°C in a reactor kept under constant stirring and under nitrogen.

[0345] After homogenization of the mixture (approximately 3 hours), the content of OH groups in the -OH fraction was measured in mg KOH / gram of -OH fraction (mg KOH / g).

Embodiment 3

[0346] Embodiment 3: the preparation of adhesive composition

[0347] The -NCO component prepared in Example 1 and the -OH component prepared in Example 2 were mixed.

[0348] Mixing was performed using a 50 ml double cylinder at a temperature of about 23°C.

[0349]

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Abstract

The present invention relates to a composition comprising: an -NCO component comprising: A) at least one polyurethane comprising at least two NCO end groups obtained by polyaddition reaction: of a composition comprising at least one diisocyanate, of a composition comprising at least one polyol, B) at least one polyisocyanate comprising at least three isocyanate NCO functions, selected from the group consisting of biurets, of isocyanurates, of adducts of diisocyanates and triols, and of mixtures thereof; an -OH component comprising: at least two polyols P1 having a number-average molecular weight of strictly less than 500 g/mol and at least one polyol P2 having a number-average molecular weight of strictly greater than 1000 g/mol, said composition comprising at least one rheology agent.

Description

technical field [0001] The present invention relates to polyurethane-based compositions. [0002] The invention also relates to the use of said composition for the repair and / or bonding of materials in the automotive, marine and / or construction sector. Background technique [0003] Two-component polyurethane-based adhesive compositions are generally used to obtain improved mechanical performance qualities. These compositions may be in the form of two compositions (or components): [0004] - one containing a chemical with isocyanate end groups (called -NCO component), and [0005] - The other (called the -OH component) contains chemicals with hydroxyl end groups. [0006] However, these polyurethane-based adhesive compositions generally have the disadvantage of using -NCO components comprising high residual amounts of diisocyanate monomers derived from synthetic (or with NCO end groups) of polyurethane prepolymers. This is because these residual diisocyanate monomers can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/66C08G18/72C08G18/76C08G18/78C08G18/16C08G18/18C08G18/22C08G18/32C08G18/42C08G18/12C08K3/26
CPCC08G18/12C08G18/163C08G18/1816C08G18/227C08G18/3206C08G18/3284C08G18/425C08G18/4825C08G18/664C08G18/6655C08G18/6674C08G18/6688C08G18/725C08G18/7621C08G18/7831C08K2003/265C08K3/36C09J175/08C08K3/26C08K3/34C08K7/16C08G18/48C08G18/32C08G18/66C08G18/3228C08G18/4238C08G18/6685C08G18/721C08G18/73C09J175/12
Inventor S·穆勒-塞拉克A·布鲁内尔
Owner BOSTIK SA
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