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High-toughness polyurethane adhesive

A polyurethane adhesive, high toughness technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, polymer adhesive additives, etc., can solve the problem that the bonding strength cannot meet its requirements, and achieve the bonding strength and heat resistance. Good properties, good water resistance, and the effect of improving wettability

Inactive Publication Date: 2020-03-24
界首市鸿鑫塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the strong polar and chemically active groups contained in polyurethane adhesives, it has excellent chemical adhesion to porous materials such as foam plastics, leather, fabrics, paper, ceramics, and materials with smooth surfaces such as metal, glass, and plastics. However, for materials in special environments, the bond strength of existing polyurethane adhesives cannot meet its requirements. For example, when applied to metals, there are higher requirements for its toughness and bond strength; or due to its use The environment needs to be in the environment of high temperature and high humidity in coastal summer, which requires the adhesives they use to have better bonding strength and high temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-toughness polyurethane adhesive made from the following raw materials in parts by weight:

[0020] Mica powder modified bentonite compound 15, casein 5, epoxy resin 10, polyurethane prepolymer 60, water-based silicone defoamer 2, plasticizer 0.8, catalyst 0.5;

[0021] Wherein the -NCO content of the polyurethane prepolymer is 2%;

[0022] Mix polyurethane prepolymer with casein and epoxy resin, stir and mix at 30°C and 200rpm for 30 minutes, then add water-based silicone defoamer, continue stirring for 10 minutes, heat to 52°C, add mica powder modified bentonite to compound Material and plasticizer, stirred for 4 minutes, heated to 80°C, added catalyst, stirred and reacted at 100rpm for 3 hours, cooled and discharged.

[0023] Further, the preparation method of the mica powder modified bentonite composite comprises the following steps:

[0024] (1) Ball mill 8 parts of mica powder at 10°C, add 8 parts of dilute nitric acid solution with a mass fraction of 5%, ...

Embodiment 2

[0031] A high-toughness polyurethane adhesive made from the following raw materials in parts by weight:

[0032] Mica powder modified bentonite compound 18, casein 7, epoxy resin 12, polyurethane prepolymer 80, water-based silicone defoamer 3, plasticizer 0.9, catalyst 0.55;

[0033] Wherein the -NCO content of the polyurethane prepolymer is 4%;

[0034] Mix polyurethane prepolymer with casein and epoxy resin, stir and mix at 35°C and 210rpm for 35 minutes, then add water-based silicone defoamer, continue stirring for 12 minutes, heat to 53°C, add mica powder modified bentonite to compound Material and plasticizer, stirred for 5 minutes, heated to 83°C, added catalyst, stirred and reacted at 120rpm for 4 hours, cooled and discharged.

[0035] Further, the preparation method of the mica powder modified bentonite composite comprises the following steps:

[0036] (1) Ball mill 9 parts of mica powder at 11°C, add 10 parts of dilute nitric acid solution with a mass fraction of 7%...

Embodiment 3

[0042] A high-toughness polyurethane adhesive made from the following raw materials in parts by weight:

[0043] Mica powder modified bentonite compound 20, casein 8, epoxy resin 15, polyurethane prepolymer 100, water-based silicone defoamer 3, plasticizer 1, catalyst 0.6;

[0044] Wherein the -NCO content of the polyurethane prepolymer is 5%;

[0045] Mix polyurethane prepolymer with casein and epoxy resin, stir and mix at 40°C and 220rpm for 40 minutes, then add water-based silicone defoamer, continue stirring for 15 minutes, heat to 55°C, add mica powder modified bentonite to compound Material and plasticizer, stirred for 6 minutes, heated to 85°C, added catalyst, stirred and reacted at 150rpm for 5 hours, cooled and discharged.

[0046] Further, the preparation method of the mica powder modified bentonite composite comprises the following steps:

[0047] (1) Ball mill 10 parts of mica powder at 12°C, add 15 parts of dilute nitric acid solution with a mass fraction of 10%...

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Abstract

The invention discloses a high-toughness polyurethane adhesive. The adhesive has the advantages of high strength, good water resistance, good toughness and good yellowing aging resistance, bonding strength and heat resistance after being cured. According to the invention, mica powder is subjected to ball milling treatment by utilizing diluted nitric acid, so a lamellar structure of the mica powderis preliminarily separated; the mica powder is modified by utilizing a silane coupling agent and alginic acid, so the dispersion characteristic of the mica powder is reinforced, and the polarity of the mica powder is improved; sodium ions are contained among sodium bentonite layers, and the sodium bentonite is subjected to an ion exchange reaction by utilizing hexadecyl trimethyl ammonium bromide, so cations of the hexadecyl trimethyl ammonium bromide enter bentonite layers to enlarge the interlayer spacing of the bentonite, and the dispersity and toughness of the bentonite are improved; andthe bentonite is subjected to ion exchange again by utilizing benzyltributylammonium bromide, so the steric hindrance of the bentonite is larger, and the discreteness of the bentonite is higher.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a high-toughness polyurethane adhesive. Background technique [0002] Due to the strong polar and chemically active groups contained in polyurethane adhesives, it has excellent chemical adhesion to porous materials such as foam plastics, leather, fabrics, paper, ceramics, and materials with smooth surfaces such as metal, glass, and plastics. However, for materials in special environments, the bond strength of existing polyurethane adhesives cannot meet its requirements. For example, when applied to metals, there are higher requirements for its toughness and bond strength; or due to its use The environment needs to be in the environment of high temperature and high humidity in coastal summer, which requires the adhesives they use to have better bonding strength and high temperature resistance. Contents of the invention [0003] To address the above problems, the present inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J189/00C09J163/00C09J11/04C09J11/08
CPCC08L2201/08C08L2205/035C09J11/04C09J11/08C09J175/04C08L63/00C08L89/00C08K9/04C08K9/02C08K3/346
Inventor 魏永灵
Owner 界首市鸿鑫塑业有限公司
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