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Preparation process of blending modified polyurethane adhesive

A technology of polyurethane adhesive and preparation process, applied in the directions of polyurea/polyurethane adhesives, adhesives, adhesive additives, etc., can solve the problems of high use cost of nano-SiO2 molecules, cumbersome operations, complex components, etc., to avoid Continuity and compactness, simple physical blending operation, simple operation process effect

Pending Publication Date: 2022-08-02
郑春华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the mechanical properties of the existing prepared polyurethane materials are general, and the use cost of nano-SiO2 molecules is relatively high, and the silica particles are not as good as micro-droplets.
At the same time, the above-mentioned patents have complex components and cumbersome operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation process of blended modified polyurethane adhesive,

[0039] Including but not limited to the following steps:

[0040] To prepare polyethersulfone, mix polyethersulfone with dichloromethane until a milky white solution is obtained;

[0041] Then 4,4'-diphenylmethane diisocyanate and polyurethane are mixed to obtain a mixture;

[0042] The milky white solution is mixed with the mixture, and the dichloromethane is evaporated using an oil bath until the dichloromethane is fully volatilized to obtain a secondary mixture; during this process,

[0043] The secondary mixture was transferred to a twin screw extruder for processing to obtain the product.

[0044] The preparation technology of the above-mentioned modified polyurethane adhesive,

[0045] The mass ratio of polyethersulfone to dichloromethane is 1:5;

[0046] Polyethersulfone is in powder form, its mesh number is 2000 mesh;

[0047] The mixing temperature was 60°C.

[0048] The preparation technolo...

Embodiment 2

[0066] The samples prepared in Example 1 were selected and tested for performance using laboratory instruments.

[0067] Meanwhile, in conjunction with embodiment 1 and comparative examples 1-3, carry out preliminary test in conjunction with following test:

[0068] Take 5g and apply it to a PTFE plate and cure it at 60°C for 48h to obtain a coating film, and then the following results are obtained:

[0069]The tensile properties were tested in accordance with QB / T2415-1998, the film-forming samples were cut into dumbbell shapes, the temperature was 25°C, the relative humidity was 65%-85%, the tensile rate was 100mm / min, and 5 experiments were taken. The average is the final result;

[0070] According to GB / T2791-1995, the T-peel strength test was carried out on the cured polyurethane film, with 5 samples in each group, and the average value was calculated.

[0071] Example 1: Peel strength / 6.1N·mm -1 , tensile strength / 30.8MPa;

[0072] Comparative Example 1: Peel Strengt...

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Abstract

The invention discloses a preparation process of a blending modified polyurethane adhesive, and belongs to the technical field of improved materials. The preparation process of the blending modified polyurethane adhesive comprises but is not limited to the following steps: preparing polyethersulfone, and mixing the polyethersulfone with dichloromethane until a milk white solution is obtained; then, 4, 4 '-diphenylmethane diisocyanate and polyurethane are mixed, and a mixture is obtained; mixing the milky white solution with the mixture, and evaporating dichloromethane by adopting an oil bath until the dichloromethane is fully volatilized to obtain a secondary mixture; and transferring the secondary mixture to a double-screw extruder for treatment to obtain a product. According to the preparation process of the blending modified polyurethane adhesive, the raw material components are simple, processing operation is facilitated, and various properties are good.

Description

technical field [0001] The invention belongs to the technical field of improved materials, in particular to an improved modified polyurethane adhesive. Background technique [0002] Polyurethane (PU) adhesives refer to adhesives containing urethane groups (—NHCOO—) or isocyanate groups (—NCO) in the molecular chain. It has excellent performance and is widely used. Due to the strong polarity of urethane and isocyanate groups, high reactivity, and can react with active hydrogen in materials, for materials containing active hydrogen such as wood, paper, leather and foam, polyurethane adhesives can be used. Provides strong adhesion. [0003] For example, prior art provides a kind of preparation method of solvent-free polyurethane adhesive, and its technical scheme is as follows: [0004] "The preparation method of solvent-free polyurethane adhesive comprises the following steps: [0005] Step 1. Preparation of polyurethane emulsion: [0006] In a three-necked flask equipped...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/08
CPCC09J175/04C09J11/08C08L81/06
Inventor 郑春华王夫华
Owner 郑春华
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