WO2022007613A1 - Adhésif de polyuréthane durcissant à l'humidité, monocomposant et sans solvant destiné à être utilisé sur du bois et procédé de préparation associé - Google Patents

Adhésif de polyuréthane durcissant à l'humidité, monocomposant et sans solvant destiné à être utilisé sur du bois et procédé de préparation associé Download PDF

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Publication number
WO2022007613A1
WO2022007613A1 PCT/CN2021/100815 CN2021100815W WO2022007613A1 WO 2022007613 A1 WO2022007613 A1 WO 2022007613A1 CN 2021100815 W CN2021100815 W CN 2021100815W WO 2022007613 A1 WO2022007613 A1 WO 2022007613A1
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Prior art keywords
polyol
polyurethane adhesive
solvent
molecular weight
average molecular
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PCT/CN2021/100815
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English (en)
Chinese (zh)
Inventor
陈由亮
江平
柳红毅
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旭川化学（苏州）有限公司
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Publication of WO2022007613A1 publication Critical patent/WO2022007613A1/fr

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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
    • C09J175/08—Polyurethanes from polyethers
    • 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
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • 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
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
    • 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
    • C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
    • C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
    • 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
    • C08G18/44—Polycarbonates
    • 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
    • C08G18/48—Polyethers
    • C08G18/4804—Two or more polyethers of different physical or chemical nature
    • C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
    • 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
    • C08G18/48—Polyethers
    • C08G18/4829—Polyethers containing at least three hydroxy groups
    • 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
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
    • 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
    • C08G18/48—Polyethers
    • C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
    • 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

Definitions

  • the invention belongs to the technical field of adhesives, and in particular relates to a solvent-free single-component moisture-curing polyurethane adhesive suitable for wood and a preparation method thereof.
  • synthetic resins used as wood adhesives generally refer to thermosetting resins.
  • Traditional wood adhesives include resorcinol-formaldehyde resin, phenol resorcinol-formaldehyde resin, melamine-urea-formaldehyde and other adhesives with formaldehyde as the main raw material.
  • such adhesives have higher shrinkage rates during curing.
  • the adhesive layer is prone to cracks and has poor water resistance; it contains free formaldehyde, which will emit formaldehyde gas to the surrounding environment during use and pollute the environment. After contact, it will cause multiple diseases such as bronchitis, asthma, dermatitis, and even malignant tumors after prolonged contact. .
  • polyurethane adhesives both It will not release toxic substances, and has the characteristics of fast curing speed, lighter color of cured product, high bonding strength, flexible structure design and convenient production and construction. According to the method of use, polyurethane adhesives can be divided into one-component and two-component.
  • One obvious advantage of one-component polyurethane adhesives over two-component polyurethane adhesives is that there is no need to perform chemical calculations or add other cross-linking agents when using them. It can be cured to produce bonding effect, which brings great convenience to construction, so it is widely used.
  • the one-component moisture-curable polyurethane adhesive used in industry is liquid, used at room temperature, and can bond to many non-wood substrates such as textile fibers, metals, plastics, rubber, etc.
  • the polyurethane adhesive includes polyol, diisocyanate, catalyst, coupling agent and chain extender, and by weight percentage, polyol 40-70 %, diisocyanate 30-55%, chain extender 0-5%, catalyst 0.1-0.5% and coupling agent 0-1%
  • the polyurethane adhesive is cured by the moisture in the air and the material, it is aimed at aluminum
  • the adhesive that can be bonded to aluminum is not necessarily suitable for use on wood, and the raw materials implemented from this patent are It can be seen from the above that only ordinary polyester polyols and polyether polyols are used, which may not
  • the present invention provides a solvent-free one-component moisture-curing polyurethane adhesive suitable for wood and a preparation method thereof.
  • a solvent-free one-component moisture-curing polyurethane adhesive in terms of mass percentage, the raw material formula of the polyurethane adhesive includes the following components:
  • the polyether polyol is a polypropylene oxide ether polyol with a functionality of 3 and a number average molecular weight of 5000-6000, a random copolymer of ethylene oxide and propylene oxide.
  • Alcohol a mixture of polytetrahydrofuran ether polyols with a functionality of 2 and a number average molecular weight of 1000-2000.
  • the polyether polyol is the random copolymerization polyether polyol of ethylene oxide and propylene oxide, the polypropylene oxide ether polyol, and the polytetrahydrofuran ether polyol in a mass ratio of 1 : 0.5 to 1: A combination of 0.5 to 3.
  • the number average molecular weight of the random copolymerized polyether polyol of ethylene oxide and propylene oxide is 2500-3500, and the molar ratio of ethylene oxide and propylene oxide is 6:3 ⁇ 5 with a functionality of 3.
  • the random copolymerized polyether polyol of ethylene oxide and propylene oxide is a polyether with a number average molecular weight of 3000, a functionality of 3, and a molar ratio of ethylene oxide to propylene oxide of 6:4 Triol. Specifically such as AD-3300E.
  • the polypropylene oxide ether polyol has a number-average molecular weight of 5000 and a degree of unsaturation of 0.005 mmol/g, a number-average molecular weight of 6000 and a degree of unsaturation of 0.005.
  • One or more of mmol/g polypropylene oxide ether polyols includes but is not limited to one or more of 330N and EP-3600.
  • the polyester polyol is a polycarbonate polyol having a functionality of 2 and a number-average molecular weight of 1000-2000, and adipic acid having a functionality of 2 and a number-average molecular weight of 1000-2000
  • adipic acid having a functionality of 2 and a number-average molecular weight of 1000-2000
  • One or more of the polyadipate-ester polyols synthesized with neopentyl glycol includes but is not limited to one or more of PCDL1000, AN-1000, and AN-2000.
  • the isocyanate is diphenylmethane diisocyanate (MDI-100), carbodiimide-modified diphenylmethane diisocyanate and mixtures thereof (liquefied MDI), 4,4' - One or more of the mixture of diphenylmethane diisocyanate and polyphenylmethane polyisocyanate (polymeric MDI).
  • the adjuvant is a surface activity modifier.
  • the auxiliary agent is one or more of organic chromium complexes, silane coupling agents, titanate coupling agents and aluminate compound coupling agents.
  • the catalyst is at least one of triethylenediamine, bismorpholine diethyl ether, N,N-dimethylcyclohexylamine, and bis(dimethylaminoethyl) ether kind.
  • Another technical solution adopted by the present invention is: the use of the above solvent-free single-component moisture-curing polyurethane adhesive in wood bonding.
  • the moisture content of the wood is a low moisture content of 8-15%.
  • Another technical solution adopted in the present invention is: the above-mentioned preparation method of solvent-free one-component moisture-curing polyurethane adhesive: reacting isocyanate, polyether polyol and polyester polyol at 70-80° C. to prepare A polyurethane prepolymer is obtained, the temperature is lowered to 50° C. or below, a catalyst and an auxiliary agent are added, and the NCO-terminated polyurethane adhesive is prepared by stirring uniformly.
  • the NCO% content of the polyurethane prepolymer is 10%-16%.
  • the present invention has the following advantages compared with the prior art:
  • the polyol in the formula is formulated with specific polyether polyol and polyester polyol, and the prepared polyurethane adhesive is used for bonding between wood and wood, and the The combined compressive shear strength is greater than 9.7MPa.
  • the single-component moisture-curable polyurethane adhesive of the present invention is used at room temperature, and is simply coated on the surface of wood, and can be cured only by using air or moisture of wood, resulting in a bonding effect, and the construction and operation are convenient.
  • the solvent-free one-component moisture-curable polyurethane adhesive for wood provided in this example is prepared by reacting polyether polyol, polyester polyol and isocyanate to obtain prepolymer, and then adding catalyst and auxiliary agent to stir uniformly to prepare The obtained NCO-terminated polyurethane prepolymer, wherein,
  • Isocyanates are carbodiimide-modified diphenylmethane diisocyanates and their mixtures (liquefied MDI), combinations of 4,4'-diphenylmethane diisocyanate and mixtures of polyphenylmethane polyisocyanates (polymeric MDI) ;
  • the polyether polyol is a combination of polypropylene oxide ether triol, ethylene oxide and propylene oxide random copolymer polyether triol, and polytetrahydrofuran ether polyol, and the number average number of polypropylene oxide ether triol is used 330N with molecular weight of 5000 and degree of unsaturation of 0.005mmol/g; ethylene oxide and propylene oxide random copolymerization polyether triol, the molar ratio of ethylene oxide and propylene oxide is 6/4, and the number average molecular weight is 3000 AD-3300E (Asahikawa Chemical); polytetrahydrofuran ether polyol adopts PTMG-2000 with a functionality of 2 and a number average molecular weight of 2000;
  • Polyester polyol uses polycarbonate polyol PCDL1000 with functionality of 2 and number average molecular weight of 1000;
  • the catalyst is selected from triethylenediamine
  • the auxiliary uses organic chromium complex.
  • the specific raw material formula of the polyurethane adhesive of this example is as follows (in mass percent):
  • the polyurethane adhesive is specifically prepared by the following method:
  • polyether polyol and polyester polyol to the reaction kettle, set the reaction temperature to 100 ⁇ 110°C, pressure -0.095MPa, mix well and dehydrate to less than 0.05% moisture, cool down to 50°C, add polymerized MDI and liquefaction MDI, set the reaction temperature to 70-80°C, stir the reaction for 3 hours, cool down to 50°C, add catalyst and auxiliary agent, stir for 0.5 hour, detect NCO% as 10%, and discharge qualified.
  • the adhesive of this example is uniformly coated under the conditions of an air temperature of 24°C, an air humidity of 50%, and a wood moisture content of 8%, and the bonding pressure is 7-10kg/square centimeter, and the final compressive shear strength is obtained after 48 hours. is 9.8MPa.
  • the solvent-free one-component moisture-curing polyurethane adhesive for wood provided in this example is different from Example 1 in that the polypropylene oxide ether triol in the polyether polyol adopts a number average molecular weight of 6000.
  • polyester polyol is a polyester polyol synthesized from adipic acid and neopentyl glycol with a functionality of 2 and a number average molecular weight of 1000 AN-1000 (Asahikawa Chemical)
  • the catalyst is selected from bismorpholine diethyl ether
  • the auxiliary agent is a silane coupling agent.
  • the specific raw material formula of the polyurethane adhesive of this example is as follows (in mass percent):
  • the polyurethane adhesive is specifically prepared by the following method:
  • polyether polyol and polyester polyol to the reaction kettle, set the reaction temperature to 100 ⁇ 110°C, pressure -0.095MPa, mix well and dehydrate to less than 0.05% moisture, cool down to 50°C, add polymerized MDI and liquefaction MDI, set the reaction temperature to 70-80°C, stir the reaction for 3 hours, cool down to 50°C, add catalyst and auxiliary agent, stir for 0.5 hour, detect NCO% as 12%, and discharge qualified.
  • the adhesive of this example is uniformly coated under the conditions of air temperature 24°C, air humidity 50%, and wood moisture content 10%, and the bonding pressure is 7-10kg/square centimeter, and the final compressive shear strength after 48 hours is 10.6MPa.
  • the solvent-free one-component moisture-curing polyurethane adhesive for wood provided in this example is different from Example 2 in that: diphenylmethane diisocyanate (MDI-100) and liquefied MDI are selected as isocyanates; polyether The polytetrahydrofuran ether polyol in the polyol is PTMG-1000 with a functionality of 2 and a number average molecular weight of 1000; the polyester polyol is a polycarbonate polyol with a functionality of 2 and a number average molecular weight of 2000, PCDL2000; the catalyst is selected from N, N-dimethylcyclohexylamine; auxiliary agent adopts titanate coupling agent.
  • MDI-100 diphenylmethane diisocyanate
  • liquefied MDI are selected as isocyanates
  • polyether The polytetrahydrofuran ether polyol in the polyol is PTMG-1000 with a functionality of 2 and a number average molecular weight of
  • the specific raw material formula of the polyurethane adhesive of this example is as follows (in mass percent):
  • the polyurethane adhesive is specifically prepared by the following method:
  • polyether polyol and polyester polyol to the reaction kettle, set the reaction temperature to 100-110°C, pressure to -0.095MPa, mix well and dehydrate to less than 0.05% moisture, cool down to 50°C, add MDI-100 and Liquefy MDI, set the reaction temperature to 70-80°C, stir and react for 3 hours, cool down to 50°C, add catalyst and auxiliary agent, stir for 0.5 hours, detect NCO% as 14%, and discharge qualified.
  • the adhesive of this example is uniformly coated under the conditions of air temperature of 24 ° C, air humidity of 50%, and wood moisture content of 14%, and the bonding pressure is 7-10kg/square centimeter, and the final compressive shear strength after 48 hours is 11.1MPa.
  • the solvent-free one-component moisture-curing polyurethane adhesive for wood provided in this example is different from Example 3 in that: the polypropylene oxide ether triol in the polyether polyol is 330N; polyester The polyol is a polyester polyol AN-2000 (Asahikawa Chemical) synthesized from adipic acid and neopentyl glycol with a functionality of 2 and a number average molecular weight of 2000; the catalyst is selected from bismorpholine diethyl ether; the auxiliary agent is aluminum Acid compound coupling agent.
  • the polypropylene oxide ether triol in the polyether polyol is 330N
  • polyester The polyol is a polyester polyol AN-2000 (Asahikawa Chemical) synthesized from adipic acid and neopentyl glycol with a functionality of 2 and a number average molecular weight of 2000
  • the catalyst is selected from bismorpholine diethyl ether
  • the auxiliary agent is aluminum Acid compound
  • the specific raw material formula of the polyurethane adhesive of this example is as follows (in mass percent):
  • the polyurethane adhesive is specifically prepared by the following method:
  • polyether polyol and polyester polyol to the reaction kettle, set the reaction temperature to 100-110°C, pressure to -0.095MPa, mix well and dehydrate to less than 0.05% moisture, cool down to 50°C, add MDI-100 and Liquefy MDI, set the reaction temperature to 70-80°C, stir and react for 3 hours, cool down to 50°C, add catalyst and auxiliary agent, stir for 0.5 hours, detect NCO% as 16%, and discharge qualified.
  • the adhesive of this example is uniformly coated under the conditions of air temperature of 24 ° C, air humidity of 50%, and wood moisture content of 15%, and the bonding pressure is 7-10kg/square centimeter, and the final compressive shear strength after 48 hours is 12.3MPa.
  • the solvent-free one-component moisture-curing polyurethane adhesive provided in this comparative example differs from Example 4 in that AD-3300E is not used.
  • the specific raw material formula of the polyurethane adhesive of this example is as follows (in mass percent):
  • the polyurethane adhesive is specifically prepared by the following method:
  • polyether polyol and polyester polyol to the reaction kettle, set the reaction temperature to 100-110°C, pressure to -0.095MPa, mix well and dehydrate to less than 0.05% moisture, cool down to 50°C, add MDI-100 and Liquefy MDI, set the reaction temperature to 70-80°C, stir and react for 3 hours, cool down to 50°C, add catalyst and auxiliary, stir for 0.5 hours, and discharge.
  • the adhesive of this example is uniformly coated under the conditions of air temperature of 24 ° C, air humidity of 50%, and wood moisture content of 15%, and the bonding pressure is 7-10kg/square centimeter, and the final compressive shear strength after 48 hours is 6.8MPa.
  • the solvent-free one-component moisture-curable polyurethane adhesive provided in this comparative example differs from Example 4 in that only AD-3300E is used for the polyether polyol.
  • the specific raw material formula of the polyurethane adhesive of this example is as follows (in mass percent):
  • the polyurethane adhesive is specifically prepared by the following method:
  • polyether polyol and polyester polyol to the reaction kettle, set the reaction temperature to 100-110°C, pressure to -0.095MPa, mix well and dehydrate to less than 0.05% moisture, cool down to 50°C, add MDI-100 and Liquefy MDI, set the reaction temperature to 70-80°C, stir and react for 3 hours, cool down to 50°C, add catalyst and auxiliary, stir for 0.5 hours, and discharge.
  • the adhesive of this example is uniformly coated under the conditions of air temperature of 24 ° C, air humidity of 50%, and wood moisture content of 15%, and the bonding pressure is 7-10kg/square centimeter, and the final compressive shear strength after 48 hours is 7.9MPa.

Abstract

L'invention concerne un adhésif de polyuréthane durcissant à l'humidité, monocomposant, sans solvant destiné à être utilisé sur du bois et un procédé de préparation associé. Calculée en pourcentage en masse, la formule de matière première de l'adhésif de polyuréthane comprend les composants suivants : 45,6-58 %, d'un acide isocyanique, 18,7-30 % d'un polyéther polyol, 20-27 % d'un polyester polyol, 0,1-0,3 % d'un catalyseur et 0,1-0,3 %. d'un ajduvant Le polyol de polyéther est un mélange d'un polyéther polyol d'oxyde de propylène ayant une fonctionnalité de 3 et un poids moléculaire moyen en nombre de 5 000 à 6 000, d'un copolymère statistique de polyéther polyol d'oxyde d'éthylène et d'oxyde de propylène, et un éther polyol de polytétrahydrofurane ayant une fonctionnalité de 2 et un poids moléculaire moyen en nombre de 1 000 à 2 000. Le polyol dans l'adhésif de polyuréthane utilise une combinaison spécifique d'un polyéther polyol et d'un polyester polyol. L'adhésif de polyuréthane obtenu par la présente préparation est utilisé comme adhésif entre des morceaux de bois, a une résistance élevée au cisaillement en compression, et permet une durabilité du bois.
PCT/CN2021/100815 2020-07-09 2021-06-18 Adhésif de polyuréthane durcissant à l'humidité, monocomposant et sans solvant destiné à être utilisé sur du bois et procédé de préparation associé WO2022007613A1 (fr)

Applications Claiming Priority (2)

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CN202010656086.9 2020-07-09
CN202010656086.9A CN111704883B (zh) 2020-07-09 2020-07-09 一种适用于木材的无溶剂单组分湿气固化聚氨酯粘合剂及其制备方法

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CN115322725A (zh) * 2022-08-22 2022-11-11 哈尔滨工业大学无锡新材料研究院 一种环氧树脂改性的单组分湿气固化聚氨酯胶粘剂及其制备方法
CN116855221A (zh) * 2023-07-12 2023-10-10 韦尔通科技股份有限公司 一种uv延迟固化聚氨酯胶黏剂及其制备方法

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