CN110184019B - Polyurethane moisture-curing hot melt adhesive for edge sealing - Google Patents
Polyurethane moisture-curing hot melt adhesive for edge sealing Download PDFInfo
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- CN110184019B CN110184019B CN201910528704.9A CN201910528704A CN110184019B CN 110184019 B CN110184019 B CN 110184019B CN 201910528704 A CN201910528704 A CN 201910528704A CN 110184019 B CN110184019 B CN 110184019B
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- C—CHEMISTRY; METALLURGY
- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4202—Two or more polyesters of different physical or chemical nature
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09J175/06—Polyurethanes from polyesters
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Abstract
A polyurethane moisture-curing hot melt adhesive for edge sealing is prepared from the following raw materials: polyester polyol 7360, 5 polyester polyol 7380, polyester polyol 7150, 1 EA28400, polyester polyol L-3017, polyester polyol H3022, copolyester resin S1402, and MDI-100. Weighing the raw materials, adding polyester polyol and copolyester resin into a reaction kettle, heating to melt, dehydrating until no bubbles escape from liquid materials, cooling to 80-100 ℃, adding MDI-100, heating to 110-120 ℃, carrying out polymerization reaction for 1.5h until the molar percentage content of the residual isocyanic acid radical reaches 0.5% -2%, filtering while hot, and discharging to obtain the edge sealing polyurethane moisture curing hot melt adhesive. The polyurethane hot melt adhesive for edge sealing, which is prepared by the invention, has excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a polyurethane moisture-curing hot melt adhesive for edge sealing, and particularly relates to a polyurethane moisture-curing hot melt adhesive for edge sealing with strong adaptability.
Background
In order to make full use of wood resources, the furniture and building material industry is increasingly using remnants of leftover bits from wood processing: laminates, density boards, particle boards, etc. The edge and corner parts of furniture and decorative members made of the boards are made of white latex, all-purpose adhesive or EVA hot melt adhesive in the past. However, these adhesives contain more or less free formaldehyde or organic solvents which are harmful to the atmospheric environment, and the curing is achieved by chemical reaction or solvent volatilization, so that a certain time is required for relative positioning from glue application to an adhered piece, and the working efficiency and automation of the glue application process are limited.
In recent years, hot melt adhesives have been developed rapidly and used widely. The hot melt adhesive is a plastic adhesive, the physical state of which changes along with the change of temperature within a certain temperature range, and the chemical property of which is unchanged, is nontoxic and tasteless, and belongs to an environment-friendly chemical product. Particularly, the EVA hot melt adhesive has large demand and wide application range, and accounts for about 80 percent of the total consumption amount of the hot melt adhesive. The hot melt adhesive is developed quickly, mainly because the hot melt adhesive is different from thermosetting, solvent and water-based adhesives, the hot melt adhesive does not contain a solvent, is free from pollution, heating and curing, has no drying process, consumes less energy and is convenient to operate, and the hot melt adhesive can be used on a high-speed continuous production line to improve the production efficiency. However, the EVA hot melt adhesive composition is thermoplastic, can be heated for use after being attached, and is reversible, so that the EVA hot melt adhesive composition has the defects of poor heat resistance, weak bonding strength, poor weather resistance and the like.
The edge sealing decoration of furniture and plates aims to seal the side surfaces or end surfaces of the plates or the decoration parts and prevent the corrosion of moisture, acid, alkali, microorganisms and pests in the environment. After the decorative material is attached, the base material and the decorative surface are required to be compact, firm in bonding, free of hollowing, wear-resistant, high-temperature and high-humidity resistant and the like. When hot-pressing veneering operation is performed after edge sealing is performed by using traditional hot melt adhesive, the adhesive layer falls off due to the fact that the adhesive layer is not resistant to high temperature of hot pressing. The temperature resistance, the chemical corrosion resistance and the aging resistance are poor, and adhesives such as white latex, solvent adhesive and the like have free formaldehyde and chemical solvent to pollute the environment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a polyurethane moisture-curing hot melt adhesive for edge sealing with strong adaptability, which is prepared from the following raw materials: polyester polyol 7360, polyester polyol 7380, polyester polyol 7150, EA28400, polyester polyol L-3017, polyester polyol H3022, copolyester resin S1402, and MDI-100.
Preferably, the polyurethane moisture-curing hot melt adhesive for edge sealing is prepared from the following raw materials in parts by mass: 5-20 parts of polyester polyol 7360, 5-20 parts of polyester polyol 7380, 10-25 parts of polyester polyol 7150, 10-25 parts of EA28400, 10-30 parts of polyester polyol L-3017, 10-30 parts of polyester polyol H3022, 5-10 parts of copolyester resin S1402, and 7-10 parts of MDI-100.
Preferably, the polyurethane moisture-curing hot melt adhesive for edge sealing is prepared from the following raw materials in parts by mass: 5-15 parts of polyester polyol 7360, 5-15 parts of polyester polyol 7380, 15-20 parts of polyester polyol 7150, 15-20 parts of EA28400, 15-25 parts of polyester polyol L-3017, 10-20 parts of polyester polyol H3022, 5-8 parts of copolyester resin S1402, and 8-10 parts of MDI-100.
Preferably, the polyurethane moisture-curing hot melt adhesive for edge sealing is prepared from the following raw materials in parts by mass: 9 parts of polyester polyol 7360, 9 parts of polyester polyol 7380, 15 parts of polyester polyol 7150, 15 parts of EA28400, 20 parts of polyester polyol L-3017, 15 parts of polyester polyol H3022, 8 parts of copolyester resin S1402 and 9 parts of MDI-100.
The invention also provides a preparation method of the polyurethane moisture curing hot melt adhesive for edge sealing, which comprises the steps of weighing the raw materials according to the mass ratio, adding the polyester polyol and the copolyester resin into a reaction kettle, heating to 90-120 ℃ under the pressure of 0.08-0.1 MPa for melting, dehydrating until no bubbles escape from liquid materials, cooling to 80-100 ℃, adding MDI-100, heating to 110-120 ℃ for polymerization reaction for 1.5h until the molar percentage content of the residual isocyanate reaches 0.5-2%, filtering while hot, and discharging to obtain the polyurethane moisture curing hot melt adhesive for edge sealing.
The polyurethane hot melt adhesive for edge sealing with strong adaptability prepared by the invention is a block copolymer containing a soft segment, a hard segment and a transition segment, wherein the soft segment is composed of oligomer polyester and polyether, the hard segment is composed of polyisocyanate or other chain extenders, and the transition segment is composed of EVA resin. They are mutually cross-linked, and their performances are complementary, and they are formed into excellent structure of product. Due to the thermodynamic incompatibility of the three chain segments, the three chain segments can be subjected to microscopic phase separation, phase regions and microphase regions can exist in the three chain segments, and hydrogen bonds can be generated by ether, urea, urethane and other groups existing in polyurethane, wherein EVA has a large contribution to the flexibility of the product, urea bonds and urethane bonds have a large contribution to the hard segment of the product, and the hard segment, the soft segment and the EVA are mutually crosslinked and complemented, so that the unique flexibility and wide-range physical properties of the product are formed. The excellent properties of the product are firstly due to the formation of microscopic phase regions, and then the hydrogen bonding of hard and soft segments occurs with the passage of time.
The polyurethane hot melt adhesive for edge sealing, which is prepared by the invention, has the advantages of excellent initial adhesion, high curing speed, large later-period curing force, uniform glue sample, good heat conductivity, low temperature and high temperature resistance, no yellowing and no bubbles in the later period and the like. The defects that the ordinary hot melt adhesive or low-end polyurethane has small initial adhesion, long curing time, uneven glue appearance, poor heat conductivity, poor adaptability to low-temperature and high-temperature environments, easy yellowing in later periods, easy generation of bubbles when heated and the like are overcome. The polyurethane hot melt adhesive for edge sealing can improve the oil and paint resistance in the processing process of a wood veneer in the production of wood veneer panel type furniture, and meanwhile, when hot-pressing veneering operation is carried out after edge sealing of traditional hot melt adhesive, the adhesive layer can not resist high temperature of hot pressing to cause the falling of edge sealing materials, so that the traditional hot melt adhesive edge sealing technology determines that the production of the wood veneer can only adopt a process of firstly adhering and then sealing edges, and then inevitably generates adhesive seams after edge sealing to reduce the grade of products. However, the edge sealing by the polyurethane hot melt adhesive of the invention effectively solves the problem. In addition, the water dipping process of the polyurethane hot melt adhesive for edge sealing is also irreversible, and the quality and the service life of high-grade indoor furniture products such as bathroom cabinets, solid wood furniture, office furniture and the like can be well improved by using the polyurethane edge sealing technology.
Compared with the traditional hot melt adhesive, the bonding strength of the polyurethane hot melt adhesive for edge sealing with strong adaptability can be improved by multiple times, and particularly the peeling strength is obviously improved. The characteristic has the irreplaceable outstanding advantage for special edge sealing materials with high bonding strength, such as aluminum materials, acrylic materials and the like. In addition, the hot melt adhesive has relatively excellent water resistance after curing. Meanwhile, the polyurethane hot melt adhesive for edge sealing, which is prepared by the invention, has excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance. Compared with traditional edge sealing adhesives such as EVA hot melt adhesive and the like, the adhesive applying method such as roller coating or spraying can be adopted, the operability is good, and the adhesive bonding process can meet the environmental protection requirement more simply and conveniently.
Detailed Description
The present invention will be further described with reference to the following examples. All the raw materials of the invention are the existing products which are purchased in the market.
Example 1
A polyurethane hot melt adhesive for edge sealing with strong adaptability is prepared from the following raw materials in parts by mass: 10 parts of polyester polyol 7360, 10 parts of polyester polyol 7380, 15 parts of polyester polyol 7150, 20 parts of EA28400, 18 parts of polyester polyol L-3017, 10 parts of polyester polyol H3022, 8 parts of copolyester resin S1402 and 9 parts of MDI-100.
The preparation method of the polyurethane hot melt adhesive for edge sealing comprises the following steps:
weighing the raw materials according to the mass ratio, firstly adding polyester polyol and copolyester resin into a reaction kettle, heating to 100 ℃ under the pressure of 0.08MPa for melting, dehydrating until no bubbles escape from liquid materials, cooling to 80 ℃, adding MDI-100, heating to 120 ℃ for polymerization reaction for 1.5h until the residual isocyanic acid radical molar percentage content reaches 1%, and then filtering and discharging when the mixture is hot.
Example 2
A polyurethane hot melt adhesive for edge sealing with strong adaptability is prepared from the following raw materials in parts by mass: 10 parts of polyester polyol 7360, 10 parts of polyester polyol 7380, 12 parts of polyester polyol 7150, 18 parts of EA28400, 20 parts of polyester polyol L-3017, 13 parts of polyester polyol H3022, 8 parts of copolyester resin S1402 and 9 parts of MDI-100.
The preparation method of the polyurethane hot melt adhesive for edge sealing comprises the following steps:
weighing the raw materials according to the mass ratio, firstly adding polyester polyol and copolyester resin into a reaction kettle, heating to 90 ℃ under the pressure of 0.085MPa for melting, dehydrating until no bubbles escape from liquid materials, cooling to 85 ℃, then adding MDI-100, heating to 115 ℃ for polymerization reaction for 1.5h until the residual content of the isocyanic acid radical reaches 1.5 mol%, and then filtering and discharging when the mixture is hot.
Example 3
A polyurethane hot melt adhesive for edge sealing with strong adaptability is prepared from the following raw materials in parts by mass: 9 parts of polyester polyol 7360, 9 parts of polyester polyol 7380, 15 parts of polyester polyol 7150, 15 parts of EA28400, 20 parts of polyester polyol L-3017, 15 parts of polyester polyol H3022, 8 parts of copolyester resin S1402 and 9 parts of MDI-100.
The preparation method of the polyurethane hot melt adhesive for edge sealing comprises the following steps:
weighing the raw materials according to the mass ratio, firstly adding polyester polyol and copolyester resin into a reaction kettle, heating to 120 ℃ under the pressure of 0.09MPa for melting, dehydrating until no bubbles escape from liquid materials, cooling to 95 ℃, then adding MDI-100, heating to 120 ℃ for polymerization reaction for 1.5h until the residual content of the isocyanic acid radical reaches 0.5 percent, and then filtering and discharging while hot to obtain the isocyanate-modified copolyester.
Comparative example 1
A polyurethane hot melt adhesive for edge sealing with strong adaptability is prepared from the following raw materials in parts by mass: 4 parts of polyester polyol 7360, 3 parts of polyester polyol 7380, 9 parts of polyester polyol 7150, 20 parts of EA28400, 30 parts of polyester polyol L-3017, 32 parts of polyester polyol H3022, 8 parts of copolyester resin S1402 and 9 parts of MDI-100.
The preparation method is the same as that of example 1.
Example 4 measurement of Properties of polyurethane Hot melt adhesive product for edge sealing
The performance of the polyurethane hot melt adhesive products for edge sealing prepared in examples 1 to 3 and comparative example 1 was tested. The specific detection method comprises the following steps:
the yellowing and aging resistance is tested by referring to GB/T2409 standard, the yellowing index of each adhesive after being irradiated by ultraviolet rays for 200 hours is tested, and the lower the yellowing index is, the better the yellowing and aging resistance is; the bonding strength refers to GB/T7124 standard, and is tested by a universal tensile testing machine, the size of the tested iron sheet base material is 100mm multiplied by 25mm multiplied by 5mm, and the gluing area is 12mm multiplied by 24 mm; testing the thermal decomposition temperature of each adhesive by a thermogravimetric analyzer under the test conditions of nitrogen protection, the heating rate of 10 ℃/min and the test temperature range of 100-500 ℃; the results of the measurement were as follows:
table 1 performance test of polyurethane hot melt adhesive for edge sealing
| Group of | Temperature of thermal decomposition (. degree.C.) | Adhesive Strength (MPa) | Yellowing index (%) |
| Comparative example 1 | 286.5 | 30.8 | 9.3 |
| Example 1 | 298.3 | 34.5 | 8.0 |
| Example 2 | 305.5 | 32.8 | 7.6 |
| Example 3 | 321.6 | 36.5 | 6.9 |
The detection results in table 1 show that the polyurethane hot melt adhesive for edge sealing prepared by the invention has excellent performance, the yellowing indexes of the adhesives prepared in the embodiments 1-3 of the invention are obviously lower than those of the comparative example 1, the bonding strength and the thermal decomposition temperature are obviously higher than those of the comparative example 1, the yellowing and aging resistance, the bonding strength and the heat resistance are good, and the polyurethane hot melt adhesive has a wide prospect in the development of the hot melt adhesive industry. Meanwhile, test results show that the influence of the raw material ratio on the product performance is obvious.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (1)
1. The preparation method of the polyurethane moisture-curing hot melt adhesive for edge sealing is characterized in that the hot melt adhesive is prepared from the following raw materials in parts by mass: 9 parts of polyester polyol 7360, 9 parts of polyester polyol 7380, 15 parts of polyester polyol 7150, 15 parts of EA28400, 20 parts of polyester polyol L-3017, 15 parts of polyester polyol H3022, 8 parts of copolyester resin S1402 and 9 parts of MDI-100; the preparation method comprises the following steps: weighing the raw materials according to the mass ratio, adding polyester polyol and copolyester resin into a reaction kettle, heating to 120 ℃ under the pressure of 0.09MPa for melting, dehydrating until no bubbles escape from liquid materials, cooling to 95 ℃, adding MDI-100, heating to 120 ℃ for polymerization reaction for 1.5 hours until the residual content of the isocyanic acid radical reaches 0.5 percent, filtering while hot, and discharging to obtain the edge sealing polyurethane moisture curing hot melt adhesive.
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| CN201910528704.9A CN110184019B (en) | 2019-06-18 | 2019-06-18 | Polyurethane moisture-curing hot melt adhesive for edge sealing |
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| CN111978907A (en) * | 2020-09-01 | 2020-11-24 | 重庆韩拓科技有限公司 | Preparation and use methods of moisture-curing polyurethane edge sealing adhesive with high initial adhesion |
| CN112341978B (en) * | 2020-11-26 | 2022-07-26 | 汉盛(青岛)新材料有限公司 | Reactive polyurethane hot melt adhesive with good stability and preparation method thereof |
| CN113388359B (en) * | 2021-06-28 | 2023-02-03 | 成都硅宝科技股份有限公司 | Edge-sealing reaction type moisture-curing polyurethane hot melt adhesive for furniture and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107502173A (en) * | 2017-09-08 | 2017-12-22 | 广州市极威新材料有限公司 | A kind of moisture-curable polyurethane hot melt adhesive stick for sheet material edge sealing |
| CN108822784A (en) * | 2018-05-25 | 2018-11-16 | 南通天洋新材料有限公司 | A kind of moisture-curable polyurethane hot melt adhesive and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107502173A (en) * | 2017-09-08 | 2017-12-22 | 广州市极威新材料有限公司 | A kind of moisture-curable polyurethane hot melt adhesive stick for sheet material edge sealing |
| CN108822784A (en) * | 2018-05-25 | 2018-11-16 | 南通天洋新材料有限公司 | A kind of moisture-curable polyurethane hot melt adhesive and preparation method thereof |
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