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Preparing process and application of wet-solidifying single-component polyurethane adhesive

A polyurethane adhesive, moisture curing technology, applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., can solve the problems of high activity, poor storage stability, gelling, etc., and achieve storage stability Good performance, non-polluting performance, strong adhesion effect

Inactive Publication Date: 2002-12-25
丛树枫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the equal reactivity of the two equivalent NCO groups in the MDI molecule, when it reacts with polyether polyols, its activity is too large, the reaction is difficult to control and prone to gelation, even if it is made into an adhesive, its storage stability also bad
Therefore, it is difficult to industrialize the preparation method using MDI as raw material, which also affects the application of this type of adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] (1) Preparation of one-component moisture-curing polyurethane adhesive

[0016]

Raw material name and specification

Feeding amount% (weight percent)

Example 1

Example 2

Example 3

Example 4

Polyether diol

N-220, hydroxyl value 56mgKOH / g

N-210, hydroxyl value 100mgKOH / g

28.16

18.88

45.5

12.5

-

45

22.6

25.2

polyether triol

N-330, hydroxyl value 56mgKOH / g

-

-

-

2.6

MDI

Pure MDI, industrial product, solid, molten

point 38~39℃,

Modified MDI, industrial product, liquid,

NCO% 25~31

32.96

-

42.0

-

-

55

-

49.6

solvent

Dioctyl phthalate

20.00

-

-

-

[0017] Note: The modified MDI in the table is carbodiimide modified MDI

[0018] 2. Preparation step...

example 1

[0020] In the existing reaction kettle with vacuum dehydration device, put N-220 and N-210 according to the ratio specified in the formula, heat to 95°C, carry out vacuum dehydration at a vacuum degree of 0.6mPa until the water content is 0.05%, and cool down to 45°C, while stirring, add the solvent dioctyl phthalate and pure MDI solid powder in the formula amount, and then raise the temperature to 80°C and keep it warm until the NCO content is 7±2% as measured by conventional methods, that is, The temperature can be lowered to 60°C, and the material is discharged and packaged tightly.

example 2

[0022] In the reactor with reflux device, put N-220 and N-210 according to the proportion specified in the formula, add an appropriate amount of reflux solvent xylene, reflux dehydration to 0.05% water content, cool down to 45 ° C, add the formula specified while stirring Proportion of pure MDI solid powder, after adding, heat up to 85°C and keep it warm for reaction. Measure the NCO content of 7±2% by conventional methods, then cool down to 55°C and discharge and seal the package.

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Abstract

A wet-solidifying single-component polyurethane adhesive for rubber particles used to make plastic-rubber athletic track, elastic rubber mat, etc is prepared from polyetherdiol or polyethertriol and 4,4'-diphenylmethane diisocyanate through reaction. Its advantages are easy control of reaction, high storage stability, high adhesion and no toxicity and pollution.

Description

technical field [0001] The invention relates to the preparation and application of a one-component moisture-curing polyurethane adhesive. Background technique [0002] Currently, 2,4-toluene diisocyanate (hereinafter referred to as TDI) is usually used to react with polyether polyol to prepare a one-component moisture-curing polyurethane adhesive. The isocyanate end group (hereinafter referred to as NCO end group) contained in this adhesive reacts with the moisture in the air to form a urea bond to achieve the purpose of curing and bonding. The reason why this preparation method is widely used is: the price of TDI and polyether polyol is lower, and the reactivity of two isocyanate groups (hereinafter referred to as NCO groups) of TDI is affected by the steric hindrance of the intramolecular methyl group, and the activity is limited. difference. Therefore, the reaction is easy to control during the preparation process. However, the vapor pressure of TDI is relatively high ...

Claims

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Application Information

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IPC IPC(8): C09J175/04
Inventor 丛树枫喻露如
Owner 丛树枫
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