CN1667074A - Polyurethanes moisture cured mono-component adhesive - Google Patents
Polyurethanes moisture cured mono-component adhesive Download PDFInfo
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- CN1667074A CN1667074A CN 200510033987 CN200510033987A CN1667074A CN 1667074 A CN1667074 A CN 1667074A CN 200510033987 CN200510033987 CN 200510033987 CN 200510033987 A CN200510033987 A CN 200510033987A CN 1667074 A CN1667074 A CN 1667074A
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- adhesive
- polyurethane
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- component adhesive
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Abstract
This invention relates to polyurethane adhesive technique field, especially one kind of polyurethanes wet curing monocomponent adhesive. The receipt is that diphenyl methane diisocyanate and polypropylene oxide diol or/and polypropylene oxide three alcohol prepared by mol ratio, additive, solvent are also included in the receipt. This invention is different from existing wet curing product, the toluene diisocynate in existing product is replaced by diphenyl methane diisocyanate, the toxicity is little and no harm to human body or environment, so it is an environment protected polyurethane adhesive. Good chemical adhesive, good shear resistant intension and shock resistant capability are possessed of this invention, so it can be used to all kinds of structural adhesion field.
Description
The technical field is as follows:
the invention relates to the technical field of polyurethane adhesives, in particular to a polyurethane moisture-curing single-component adhesive.
Background art:
polyurethane (PU) adhesives are adhesives containing urethane (- -NHCOO- -) and/or isocyanate (- -NCO) groups in the molecular chain. The polyurethane adhesive has excellent performance, is widely applied in national economy, and is one of important varieties in synthetic adhesives.
Polyurethane adhesives were first commercialized in germany in the 40 th of the 20 th century. Later, due to the research of chemical bases and the continuous progress of adhesive technology, various varieties are gradually developed, mainly including polyisocyanate solvent adhesives, thermoplastic polyurethane solvent adhesives, reactive single-component and double-component solvent adhesives, solvent-free, water-dispersible, hot-melt and reactive hot-melt polyurethane adhesives and the like. The polyurethane adhesive has good adhesion to various base materials because the main resin molecules contain a large amount of polar groups and active reaction groups. The variety of synthetic raw materials and auxiliary agents is wide, the variation range of resin composition, structure and adhesive formula is wide, a series of adhesives with great variation range of performance can be synthesized and prepared from molecular design, and the requirements of bonding and using conditions of different base materials can be met, so that the rapid development is achieved.
In the current production process of polyurethane adhesives, one main raw material is isocyanate, and the main chemical reaction is as follows: the reaction of isocyanates with alcohol compounds produces polyurethanes. The isocyanate most commonly used today is toluene diisocyanate (TDI, e.g., TDI-80, TDI-65, TDI-100). Toluene diisocyanate is hazardous to production personnel and environment due to certain toxicity.
In addition, the weather resistance and aging resistance of the conventional polyurethane adhesives are weak.
The invention content is as follows:
the invention aims to overcome the defectsof the prior art and provide a polyurethane moisture-curing single-component adhesive with environmental protection and excellent performance.
In order to solve the technical problems, the invention adopts the following technical scheme: the formula of the adhesive comprises: the adhesive comprises diphenylmethane diisocyanate and polyoxypropylene diol or/and polyoxypropylene triol in a reaction molar ratio, and also comprises an additive and a solvent in the formula.
The additive is antioxidant and ultraviolet absorbent.
The solvent is acetone or ethyl acetate.
The invention is different from the current moisture-curing product, adopts diphenylmethane diisocyanate to replace the current toluene diisocyanate, has low toxicity and no harm to human bodies or environment, and is an environment-friendly polyurethane adhesive. Meanwhile, the adhesive has excellent chemical bonding force, good splicing resistance and impact resistance, and is suitable for various structural bonding fields.
The specific implementation mode is as follows:
the invention relates to a polyurethane moisture-curing single-component adhesive, the formula of which comprises: the adhesive comprises diphenylmethane diisocyanate and polyoxypropylene diol or/and polyoxypropylene triol in a reaction molar ratio, and also comprises an additive and a solvent in the formula. The additive is antioxidant and ultraviolet absorbent. The solvent is acetone or ethyl acetate. The main chemical reaction principle of the invention is as follows:
since the present invention contains active NCO groups, it can react with trace moisture in the air when exposed to the air. When in bonding, the invention generates chemical reaction with the active hydrogen groups such as hydroxyl and the like in the raw materials and the surface of the base material to be bonded to absorb moisture, thereby generating a urea bond structure. Due to the cross-linking bridge of the polyurea, the invention has short hot pressing time, excellent water resistance and weather resistance and low dosage of the adhesive.
Specifically, firstly, polyoxypropylene diol and/or polyoxypropylene triol is added to 100 parts of diphenylmethane diisocyanate in the molar ratio of reaction, and stirring is carried out for 30 minutes. The amount of the diphenylmethane diisocyanate can be 2-7 times more than that of the polyol hydroxyl according to the reaction molar ratio.
Then adding antioxidant and ultraviolet absorbent, wherein the antioxidant can be BHT (dibutyl hydroxy toluene), and the ultraviolet absorbent can be UV 770. The proportion of the additive in the total amount of the invention is as follows: 0.05-5%.
Finally, adding Ethyl Acetate (EAC) or acetone solvent (AC), stirring, and mixing well. The content of the solvent is 50-85 parts.
The technical indexes of the invention prepared by the method are shown in the following table:
| item | Index (I) | Item | Index (I) |
| Appearance of the product | Colorless, transparent liquid | Viscosity mpa.s/25 deg.C | 2000±500 |
| Percentage of NCO | 12±0.2 | Density g/cm3 | 12±0.5 |
| Percent of solid content | 95％ | Flash point. C | About-0.3 |
The invention is different from the current moisture-curing product, adopts diphenylmethane diisocyanate to replace the current toluene diisocyanate, has low toxicity and no harm to human bodies or environment, and is an environment-friendly polyurethane adhesive.
Secondly, the invention has strong polar chemical activity-NCO-, -NHCOO-group, and has excellent chemical adhesive force with base material containing active hydrogen, such as foam, plastic, wood, leather, fabric, paper, ceramic and other porous materials, and metal, glass, rubber, plastic and other materials with smooth surfaces.
Furthermore, the invention has good anti-splicing strength and impact resistance, is suitable for various structural bonding fields, and also has good flexibility.
The invention also has good rubber characteristic, can adapt to the bonding of base materials with different thermal expansion coefficients, forms a soft and hard transition layer between the base materials, has strong bonding force and simultaneously has good buffering and damping functions.
In addition, the invention has more stable characteristics than similar products under the conditions of low temperature and ultralow temperature, has better weather resistance under the high-temperature environment, and can not be hydrolyzed and aged.
Claims (3)
1. The polyurethane moisture-curing single-component adhesive is characterized in that: the formula of the adhesive comprises: the adhesive comprises diphenylmethane diisocyanate and polyoxypropylene diol or/and polyoxypropylene triol in a reaction molar ratio, and also comprises an additive and a solvent in the formula.
2. The polyurethane-based moisture-curing one-component adhesive according to claim 1, characterized in that: the additive is antioxidant and ultraviolet absorbent.
3. The polyurethane-based moisture-curing one-component adhesive according to claim 1, characterized in that: the solvent is acetone or ethyl acetate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510033987 CN1667074A (en) | 2005-04-08 | 2005-04-08 | Polyurethanes moisture cured mono-component adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510033987 CN1667074A (en) | 2005-04-08 | 2005-04-08 | Polyurethanes moisture cured mono-component adhesive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1667074A true CN1667074A (en) | 2005-09-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510033987 Pending CN1667074A (en) | 2005-04-08 | 2005-04-08 | Polyurethanes moisture cured mono-component adhesive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1667074A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824301A (en) * | 2010-03-22 | 2010-09-08 | 袁敏华 | Whole anti-UV antifatigue and anti-melanin cell adhesive and preparation method thereof |
| CN104845580A (en) * | 2015-05-15 | 2015-08-19 | 饶玉明 | Single-component elastic polyurethane sealant |
| CN104861921A (en) * | 2015-05-15 | 2015-08-26 | 饶玉明 | Preparation method of one-component elastic polyurethane sealant |
-
2005
- 2005-04-08 CN CN 200510033987 patent/CN1667074A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824301A (en) * | 2010-03-22 | 2010-09-08 | 袁敏华 | Whole anti-UV antifatigue and anti-melanin cell adhesive and preparation method thereof |
| CN101824301B (en) * | 2010-03-22 | 2011-12-14 | 袁敏华 | Whole anti-UV antifatigue and anti-melanin cell adhesive and preparation method thereof |
| CN104845580A (en) * | 2015-05-15 | 2015-08-19 | 饶玉明 | Single-component elastic polyurethane sealant |
| CN104861921A (en) * | 2015-05-15 | 2015-08-26 | 饶玉明 | Preparation method of one-component elastic polyurethane sealant |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |