CN111303824A - Moisture-curing polyurethane hot melt adhesive, preparation method and application thereof, and steel member - Google Patents
Moisture-curing polyurethane hot melt adhesive, preparation method and application thereof, and steel member Download PDFInfo
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/08—Polyurethanes from polyethers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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- C08G18/40—High-molecular-weight compounds
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C09J11/06—Non-macromolecular additives organic
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/16—Metal
- C09J2400/163—Metal in the substrate
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- C09J2475/00—Presence of polyurethane
Abstract
The invention belongs to the technical field of polyurethane hot melt adhesives, and particularly relates to a moisture-curing polyurethane hot melt adhesive, and a preparation method, application and a steel member thereof. The single-component moisture-curing polyurethane hot melt adhesive comprises the following raw materials: a hot melt adhesive main body, a coupling agent and an auxiliary agent; and the components are suitable for forming the polyurethane hot melt adhesive with the solid content of 100 percent. The adhesive has the advantages of no release of small molecules in the using process, safety, environmental protection, no pollution, environmental friendliness, long service life, high bonding strength, safety, reliability and the like, has no particle and bubble phenomena after glue application, is flexible and elastic after glue curing, has better high and low temperature resistance, and can be widely applied to composite bonding of steel structure facing materials.
Description
Technical Field
The invention belongs to the technical field of polyurethane hot melt adhesives, and particularly relates to a moisture-curing polyurethane hot melt adhesive, and a preparation method, application and a steel member thereof.
Background
The steel structure building has the advantages of light weight, high strength, good integral rigidity, strong deformability and the like, and is widely used for building architectural facilities such as venues, airports, stations, high-rise buildings, factory buildings and the like. However, the steel structure building is easy to leak along with the lapse of time, and the service life of the building is seriously influenced. In the prior art, the sealant or SBS (styrene butadiene styrene) adhesive is generally adopted to treat the steel structure material, and the leakage problem of the steel structure building still cannot be solved.
Disclosure of Invention
The invention provides a moisture-curing polyurethane hot melt adhesive, a preparation method and application thereof and a steel member.
In order to solve the technical problems, the invention provides a moisture-curing polyurethane hot melt adhesive which comprises the following raw materials: a hot melt adhesive main body, a coupling agent and an auxiliary agent; and the components are suitable for forming the polyurethane hot melt adhesive with the solid content of 100 percent.
In a second aspect, the invention provides a preparation method of a polyurethane hot melt adhesive, which comprises the following steps: mixing and dispersing nano silicon dioxide and epoxy resin; heating; adding polyether polyol, crystalline polyester polyol, tackifying resin, acrylic resin, a coupling agent, a flatting agent and an antioxidant, and performing vacuum dehydration; cooling; adding isocyanate under the protection of nitrogen to react; adding a catalyst, and continuing the reaction; and discharging, filling with nitrogen, and sealing to obtain the polyurethane hot melt adhesive.
In a third aspect, the invention provides application of a polyurethane hot melt adhesive as an adhesive at the pasting position of PVC and a steel structure.
In a fourth aspect, the present invention provides a steel member comprising: the PVC heat-preservation steel structure comprises a steel structure, a PVC layer positioned on the surface of the steel structure and a polyurethane hot-melt adhesive layer positioned between the steel structure and the PVC layer.
The moisture-curing polyurethane hot melt adhesive and the preparation method and application thereof have the advantages that the steel member does not contain a solvent, the solid content is 100%, no micromolecules are released in the using process, the moisture-curing polyurethane hot melt adhesive is safe, environment-friendly and pollution-free, the moisture-curing polyurethane hot melt adhesive has the advantages of being environment-friendly, long in service life, high in bonding strength, safe, reliable and the like, particles and bubbling are avoided after glue is applied, an adhesive film after glue curing is flexible and elastic, high and low temperature resistant is good, and the moisture-curing polyurethane hot melt adhesive can be widely applied to composite bonding.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of the process for preparing the moisture-curing polyurethane hot melt adhesive of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A first part: description of the technical solution
The leakage problem of steel structure buildings is difficult to solve by generally adopting sealant or SBS (styrene butadiene styrene) glue aiming at the leakage phenomenon of steel components. Therefore, the invention provides a polyurethane hot melt adhesive, which comprises the following raw materials: a hot melt adhesive main body, a coupling agent and an auxiliary agent; and the components are suitable for forming the polyurethane hot melt adhesive with the solid content of 100 percent. Specifically, a PVC full-bonding method is adopted to prepare a steel structure material, namely, an isocyanate-terminated polyurethane prepolymer (namely the hot melt adhesive main body) is adopted as a main component to prepare a single-component adhesive (namely the polyurethane hot melt adhesive of the scheme), and the polyurethane hot melt adhesive is generally in a solid state at normal temperature, can be coated on a steel structure after being heated and melted to be in a liquid state, and then is compounded with an adherend (such as PVC) for molding, and the adhesive is applied, cooled and solidified. Optionally, the coupling agent includes, but is not limited to, at least one of KH 550 and a 187, and is used for improving the adhesion of the hot melt adhesive to the steel structure.
As an alternative embodiment of the hot melt adhesive body.
The hot melt adhesive main body comprises the following raw materials in parts by mass: epoxy resin: 30-60 parts; nano silicon dioxide: 5-10 parts; polyether polyol: 20-60 parts; crystalline polyester polyol: 10-30 parts; tackifying resin: 2-10 parts; acrylic resin: 10-40 parts; and an isocyanate: 10-30 parts.
Optionally, the hot melt adhesive main body comprises the following raw materials in parts by mass: epoxy resin: 42 parts of (A); nano silicon dioxide: 6 parts of (1); polyether polyol: 46 parts of (a); crystalline polyester polyol: 22 parts of (A); tackifying resin: 7 parts; acrylic resin: 18 parts of a mixture; and an isocyanate: 12 parts.
The raw materials in the hot melt adhesive main body can be matched by adopting the following specific substances:
optionally, the epoxy resin includes, but is not limited to, at least one of EP-12, EP-13, EP-16, EP-20; the nano silicon dioxide comprises but is not limited to at least one of R972, R974, R202 and TS 720; the polyether polyol includes but is not limited to at least one of PPG 400, PPG 1000 and PPG2000, and the number average molecular weight of the polyether polyol is 400-2000, optionally 1000, 2000; the crystalline polyester polyol comprises but is not limited to at least one of Dynacoll 7360, Dynacoll7380, POL-S3500 and XCP-3500H, and the number average molecular weight of the crystalline polyester polyol is 2000-4000, optionally 3000 and 3500; the tackifying resin comprises at least one of but not limited to hydrocarbon resin, rosin resin, terpene resin and thermoplastic polyurethane resin; the acrylic resin has the number average molecular weight of 30000-90000 and the Tg of 30-90 ℃, and can be selected from at least one of BR113, BR106, BR116, Elvacite2013, Elvacite 2016, B60, B66, B735, B725, MB685, Degalan LP 64/12 and AC 1630; the isocyanate includes, but is not limited to, at least one of diphenylmethane diisocyanate (MDI), Toluene Diisocyanate (TDI), Hexamethylene Diisocyanate (HDI), isophorone diisocyanate (IPDI), 4-dicyclohexylmethane diisocyanate (HMDI).
The hot melt adhesive main body of the embodiment endows the hot melt adhesive with different performances through various raw materials and the combination effect thereof, for example, the epoxy resin can effectively improve the bonding strength between PVC and steel; for example, the nano silicon dioxide can be used for modifying the epoxy resin, so that the temperature resistance and the toughness of the epoxy resin are effectively improved; for example, polyether polyol reduces the viscosity of the hot melt adhesive and improves the fluidity and the adhesiveness of the hot melt adhesive; for example, the tackifying resin can improve the bonding strength of the hot melt adhesive and improve the compatibility of the acrylic resin in a system; for example, the crystalline polyester polyol endows the hot melt adhesive with better final adhesive strength and positioning property; the acrylic resin can improve the initial adhesive strength of the hot melt adhesive; meanwhile, the joint use of the acrylic resin and the crystalline polyester polyol can also determine the final adhesive strength of the hot melt adhesive; in addition, the addition amount of the acrylic resin is controlled, so that the situation that the hot melt adhesive is granulated after being melted when the content of the acrylic resin is too much can be prevented, and the normal use of the veneering of the PVC and the steel structure after bonding is influenced.
As an alternative embodiment of the auxiliary.
The auxiliary agent comprises the following raw materials in parts by weight: leveling agent: 0.1-1 part; antioxidant: 0.1-1 part; and a catalyst: 0.01-0.1 portion.
Optionally, the auxiliary agent comprises the following raw materials in parts by mass: leveling agent: 0.7 part; antioxidant: 0.3 part; and a catalyst: 0.06 part.
The raw materials in the auxiliary agent can be matched by the following specific substances:
optionally, the leveling agent includes but is not limited to at least one of acrylics, silicones and fluorine, and is used for improving the wettability of the hot melt adhesive on the surface of the steel structure and improving the flatness of the adhesive film after coating; the antioxidant comprises at least one of antioxidants 1010 and 168, and is used for delaying or inhibiting the oxidative decomposition of the hot melt adhesive; the catalyst is selected from amine catalysts.
The auxiliary agent of the embodiment is selectively blended through the leveling agent, the antioxidant and the catalyst, so that the wettability of the hot melt adhesive on the surface of a steel structure can be improved, the curing time of the hot melt adhesive is prolonged through slowing down or inhibiting the oxidative decomposition of the hot melt adhesive and other modes, the hot melt adhesive has enough flowing time after being coated, and the flatness of the adhesive film is improved.
Since the conventional one-component polyurethane adhesive generally contains a solvent, environmental pollution is caused when it is used. The moisture-curing polyurethane hot melt adhesive is prepared by mixing various raw materials such as epoxy resin, nano silicon dioxide, polyether glycol, crystalline polyester polyol, tackifying resin, acrylic resin, isocyanate and the like to prepare a hot melt adhesive main body, and then matching with a coupling agent, other additives and the like to prepare the polyurethane hot melt adhesive, wherein an isocyanate-terminated polyurethane prepolymer is taken as a class of adhesive which is generally in a solid state at normal temperature, is heated and melted to be in a liquid state during use, is coated on a steel structure, and is compounded and formed with an adherend, after the adhesive is applied with glue, cooled and cured, the blocked isocyanate groups can continuously react with active hydrogen on the surface of a base material and moisture in the air to extend chains, and are cured and crosslinked, so the polyurethane hot melt adhesive does not contain a solvent, has 100 percent of solid content, does not release small molecules during use, is safe, environment-, the adhesive is an effective combination of the adhesive strength and the environmental protection property of the polyurethane hot melt adhesive, is particularly suitable for being used as an adhesive material for PVC and steel structure veneering, and has the advantages of environmental protection, high adhesive strength, good heat resistance, almost no environmental pollution, safety, reliability and the like.
In addition, compared with the prior art, the moisture-curing polyurethane hot melt adhesive disclosed by the invention also has the following advantages:
(1) the environment-friendly water-based paint does not contain any solvent, has 100 percent of solid content, does not release small molecules in the using process, and is safe, environment-friendly and pollution-free.
(2) The initial adhesion strength and the final adhesion strength of the hot melt adhesive are both high, the curing time is short, and the cured adhesive film is flexible and elastic and has good high-temperature and low-temperature resistance.
(3) After the temperature of the hot melt adhesive is raised and melted, the glue is in a uniform flowing state, and no particles or bubbles occur after the glue is applied.
(4) When the hot melt adhesive is used, the curing process is simple, the curing speed is high, and the working efficiency is favorably improved.
Further, referring to fig. 1, the invention provides a preparation method of a polyurethane hot melt adhesive, comprising the following steps: mixing and dispersing nano silicon dioxide and epoxy resin; heating; adding polyether polyol, crystalline polyester polyol, tackifying resin, acrylic resin, a coupling agent, a flatting agent and an antioxidant, and performing vacuum dehydration; cooling; adding isocyanate under the protection of nitrogen to react; adding a catalyst, and continuing the reaction; and discharging, filling with nitrogen, and sealing to obtain the polyurethane hot melt adhesive.
Specifically, the epoxy resin is placed under a high-speed dispersion machine, and the nano-silica is added to the epoxy resin for high-speed dispersion to prepare the component A. Then heating the reaction kettle to 130 ℃ to form mixed dispersion liquid; adding the component A, polyether polyol, crystalline polyester polyol, tackifying resin, acrylic resin, a coupling agent, a leveling agent and an antioxidant, dehydrating in vacuum for 3 hours, cooling to 90-110 ℃, adding isocyanate under the protection of nitrogen, reacting for 1-2 hours at 110 ℃ until the NCO% content of a reaction product reaches a theoretical value (about 1.5%), adding a catalyst, continuing to react for 10-20 minutes, stopping the reaction, discharging to an aluminum foil bag, and sealing after filling with nitrogen to obtain the polyurethane hot melt adhesive.
Further, the invention provides application of the polyurethane hot melt adhesive as an adhesive at the position of the pasting surface of PVC and a steel structure.
Further, the present invention provides a steel member comprising: the PVC heat-preservation steel structure comprises a steel structure, a PVC layer positioned on the surface of the steel structure and a polyurethane hot-melt adhesive layer positioned between the steel structure and the PVC layer.
Alternatively, the polyurethane hot melt adhesive layer is suitable for being formed by curing the polyurethane hot melt adhesive as described above.
A second part: DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
40 parts of EP-16 (epoxy resin) is placed under a high-speed dispersion machine, 5 parts of R974 (nano silicon dioxide) is added, and then the mixture is dispersed at high speed to prepare a component A. Heating the reaction kettle to 130 ℃, adding 40 parts of A, PPG2000 (polyether polyol), 20 parts of Dynacoll 7360 (crystalline polyester polyol), 25 parts of Elvacite2013 (acrylic resin), 5 parts of Vestoplast508 (tackifying resin), 1 part of KH 550 (coupling agent), 10100.1 parts of antioxidant and 0.1 part of flatting agent, cooling to 90-110 ℃ after vacuum dehydration is carried out for 3 hours, adding 13 parts of MDI (isocyanate) under the protection of nitrogen, reacting for 1-2 hours at 110 ℃ until the NCO% content of a reaction product reaches a theoretical value (about 1.5%), adding 0.1 part of DMDEE (amine catalyst), reacting for 10-20 minutes, stopping the reaction, discharging to an aluminum foil bag, and sealing after nitrogen filling to obtain the polyurethane hot melt adhesive.
Example 2
Example 2 differs from example 1 in that the amounts of the respective raw materials were adjusted, namely:
EP-16 (epoxy resin) 40 parts;
5 parts of R974 (nano silicon dioxide);
60 parts of PPG2000 (polyether glycol);
20 parts of Dynacoll 7360 (crystalline polyester polyol);
elvacite2013 (acrylic resin) 25 parts;
5 parts of Vestoplast508 (tackifying resin);
1 part of KH 550 (coupling agent);
10100.1 parts of an antioxidant;
0.1 part of a leveling agent;
13 parts of MDI (isocyanate);
0.1 part of DMDEE (amine catalyst).
Example 3
Example 3 differs from example 1 in that the amounts of the respective raw materials were adjusted, namely:
EP-16 (epoxy resin) 40 parts;
5 parts of R974 (nano silicon dioxide);
40 parts of PPG2000 (polyether glycol);
dynacoll 7360 (crystalline polyester polyol) 40 parts;
elvacite2013 (acrylic resin) 25 parts;
5 parts of Vestoplast508 (tackifying resin);
1 part of KH 550 (coupling agent);
10100.1 parts of an antioxidant;
0.1 part of a leveling agent;
13 parts of MDI (isocyanate);
0.1 part of DMDEE (amine catalyst).
Example 4
Example 4 differs from example 1 in that the amounts of the respective raw materials were adjusted, namely:
EP-16 (epoxy resin) 40 parts;
5 parts of R974 (nano silicon dioxide);
40 parts of PPG2000 (polyether glycol);
20 parts of Dynacoll 7360 (crystalline polyester polyol);
elvacite2013 (acrylic resin) 40 parts;
5 parts of Vestoplast508 (tackifying resin);
1 part of KH 550 (coupling agent);
10100.1 parts of an antioxidant;
0.1 part of a leveling agent;
13 parts of MDI (isocyanate);
0.1 part of DMDEE (amine catalyst).
Example 5
Example 5 differs from example 1 in that the amounts of the respective raw materials were adjusted, namely:
EP-16 (epoxy resin) 40 parts;
5 parts of R974 (nano silicon dioxide);
40 parts of PPG2000 (polyether glycol);
20 parts of Dynacoll 7360 (crystalline polyester polyol);
elvacite2013 (acrylic resin) 25 parts;
1 part of KH 550 (coupling agent);
10100.1 parts of an antioxidant;
0.1 part of a leveling agent;
13 parts of MDI (isocyanate);
0.1 part of DMDEE (amine catalyst).
Example 6
Example 6 differs from example 1 in that the amounts of the respective raw materials were adjusted, namely:
60 parts of EP-16 (epoxy resin);
10 parts of R974 (nano silicon dioxide);
20 parts of PPG2000 (polyether glycol);
10 parts of Dynacoll 7360 (crystalline polyester polyol);
elvacite2013 (acrylic resin) 40 parts;
1 part of KH 550 (coupling agent);
10101 parts of an antioxidant;
0.1 part of a leveling agent;
10 parts of MDI (isocyanate);
0.1 part of DMDEE (amine catalyst).
Example 7
Example 7 differs from example 1 in that the amounts of the respective raw materials were adjusted, namely:
EP-16 (epoxy resin) 30 parts;
5 parts of R974 (nano silicon dioxide);
60 parts of PPG2000 (polyether glycol);
30 parts of Dynacoll 7360 (crystalline polyester polyol);
10 parts of Elvacite2013 (acrylic resin);
1 part of KH 550 (coupling agent);
10100.8 parts of an antioxidant;
0.6 part of a leveling agent;
MDI (isocyanate) 30 parts;
0.04 part of DMDEE (amine catalyst).
Comparative example 1
Comparative example 1 differs from example 1 in that: the amount of PPG2000 (polyether polyol) used is 80 parts.
Comparative example 2
Comparative example 2 differs from example 1 in that: dynacoll 7360 (crystalline polyester polyol) was used in an amount of 40 parts.
Comparative example 3
Comparative example 3 differs from example 1 in that: the amount of Elvacite2013 (acrylic resin) is 50 parts.
Comparative example 4
Comparative example 4 differs from example 1 in that: the amount of Vestoplast508 (tackifying resin) was 0 parts, i.e. Vestoplast508 (tackifying resin) was not added.
And a third part: comparison of Performance
The present application contains various embodiments of moisture-curing polyurethane hot melt adhesives, and now only the performances of the moisture-curing polyurethane hot melt adhesives prepared in example 1 and comparative examples 1 to 4 are compared, wherein the raw material components in each example are shown in table 1, and the results of the comparison of the adhesion performances are shown in table 2.
TABLE 1 raw Material Components and contents of Hot melt adhesive
| Raw materials | Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| EP-16 (epoxy resin) | 40 | 40 | 40 | 40 | 40 |
| R974 (nanometer silicon dioxide) | 5 | 5 | 5 | 5 | 5 |
| PPG2000 (polyether polyol) | 40 | 80 | 40 | 40 | 40 |
| Dynacoll 7360 (crystalline polyester polyol) | 20 | 20 | 40 | 20 | 20 |
| Elvacite2013 (acrylic resin) | 25 | 25 | 25 | 50 | 25 |
| Vestoplast508 (tackifying resin) | 5 | 5 | 5 | 5 | 0 |
| KH 550 (coupling agent) | 1 | 1 | 1 | 1 | 1 |
| Antioxidant 1010 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Leveling agent | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| MDI (isocyanate) | 13 | 13 | 13 | 13 | 13 |
| DMDEE (amine catalyst) | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
The contents of the components in table 1 are parts by mass.
TABLE 2 comparison table of bonding performance of PVC and steel structure at veneering position
The data in tables 1 and 2 show that the hot melt adhesive prepared in example 1 has bonding performance far better than that of the hot melt adhesives prepared in comparative examples 1, 2, 3 and 4, and the main reason is that the amount of polyether polyol used in comparative example 1 is increased, so that the bonding performance is reduced; the increase of the dosage of the crystalline polyester polyol in the comparative example 2 leads to the increase of the crystallization speed, the increase of the crystallinity and the decrease of the final bonding strength; comparative example 3 increases the amount of acrylic resin, which can improve the adhesive strength, but increases the amount of acrylic resin, which is liable to generate particles in later operations, affecting the use; comparative example 4, in which no tackifying resin was added, resulted in a decrease in adhesive strength.
In conclusion, the moisture-curing polyurethane hot melt adhesive and the preparation method and application thereof, and the steel component are prepared by reacting epoxy resin, nano silicon dioxide, polyether polyol, crystalline polyester polyol, tackifying resin and acrylic resin which are used as main raw materials with auxiliary agents, coupling agents, flatting agents and antioxidants and isocyanate. The glue film has the advantages of environmental friendliness, long service life, high bonding strength, safety, reliability and the like, has no particle and bubble phenomenon after glue application, is flexible and elastic after glue curing, has better high and low temperature resistance, and can be widely applied to composite bonding of a steel structure and a PVC material veneer.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The polyurethane hot melt adhesive is characterized by comprising the following raw materials:
a hot melt adhesive main body, a coupling agent and an auxiliary agent; and
the components are suitable for forming the polyurethane hot melt adhesive with the solid content of 100 percent.
2. The polyurethane hot melt adhesive of claim 1,
the hot melt adhesive main body comprises the following raw materials in parts by mass:
epoxy resin: 30-60 parts;
nano silicon dioxide: 5-10 parts;
polyether polyol: 20-60 parts;
crystalline polyester polyol: 10-30 parts;
tackifying resin: 2-10 parts;
acrylic resin: 10-40 parts; and
isocyanate: 10-30 parts.
3. The polyurethane hot melt adhesive of claim 2,
the polyether polyol has a number average molecular weight of 400-.
4. The polyurethane hot melt adhesive of claim 2,
the number average molecular weight of the crystalline polyester polyol is 2000-4000.
5. The polyurethane hot melt adhesive of claim 2,
the number average molecular weight of the acrylic resin is 30000-90000, and the Tg is 30-90 ℃.
6. The polyurethane hot melt adhesive of claim 1,
the auxiliary agent comprises the following raw materials in parts by weight:
leveling agent: 0.1-1 part;
antioxidant: 0.1-1 part; and
catalyst: 0.01-0.1 portion.
7. A preparation method of a polyurethane hot melt adhesive is characterized by comprising the following steps:
mixing and dispersing nano silicon dioxide and epoxy resin;
heating;
adding polyether polyol, crystalline polyester polyol, tackifying resin, acrylic resin, a coupling agent, a flatting agent and an antioxidant, and performing vacuum dehydration;
cooling;
adding isocyanate under the protection of nitrogen to react;
adding a catalyst, and continuing the reaction; and
discharging, filling with nitrogen, and sealing to obtain the polyurethane hot melt adhesive.
8. An application of a polyurethane hot melt adhesive as a binder at the pasting position of PVC and a steel structure.
9. A steel member, comprising:
the PVC heat-preservation steel structure comprises a steel structure, a PVC layer positioned on the surface of the steel structure and a polyurethane hot-melt adhesive layer positioned between the steel structure and the PVC layer.
10. Steel structure according to claim 9,
the polyurethane hot melt adhesive layer is suitable for being formed by curing the polyurethane hot melt adhesive according to any one of claims 1 to 6.
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| CN112646530A (en) * | 2020-12-18 | 2021-04-13 | 黄世斌 | Moisture-curing hot melt adhesive capable of being rapidly cured at low temperature |
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