CN114276777A - Reactive polyurethane hot melt adhesive and preparation method thereof - Google Patents
Reactive polyurethane hot melt adhesive and preparation method thereof Download PDFInfo
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- CN114276777A CN114276777A CN202111616044.3A CN202111616044A CN114276777A CN 114276777 A CN114276777 A CN 114276777A CN 202111616044 A CN202111616044 A CN 202111616044A CN 114276777 A CN114276777 A CN 114276777A
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- hot melt
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 36
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 36
- 239000004831 Hot glue Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 33
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 13
- 229920000570 polyether Polymers 0.000 claims abstract description 13
- 229920005862 polyol Polymers 0.000 claims abstract description 13
- 150000003077 polyols Chemical class 0.000 claims abstract description 13
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 12
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 12
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 239000005060 rubber Substances 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 5
- 239000012948 isocyanate Substances 0.000 claims abstract description 5
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 229920001451 polypropylene glycol Polymers 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 4
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 3
- -1 vinylidene octanoate Chemical compound 0.000 claims description 3
- 229940008841 1,6-hexamethylene diisocyanate Drugs 0.000 claims description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 2
- 125000005250 alkyl acrylate group Chemical group 0.000 claims description 2
- 235000010290 biphenyl Nutrition 0.000 claims description 2
- 239000004305 biphenyl Substances 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 2
- 150000002734 metacrylic acid derivatives Chemical class 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 2
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 239000003292 glue Substances 0.000 description 7
- ZMSQJSMSLXVTKN-UHFFFAOYSA-N 4-[2-(2-morpholin-4-ylethoxy)ethyl]morpholine Chemical compound C1COCCN1CCOCCN1CCOCC1 ZMSQJSMSLXVTKN-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000005062 Polybutadiene Substances 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920002857 polybutadiene Polymers 0.000 description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- BJZYYSAMLOBSDY-QMMMGPOBSA-N (2s)-2-butoxybutan-1-ol Chemical compound CCCCO[C@@H](CC)CO BJZYYSAMLOBSDY-QMMMGPOBSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- BSUDZBWVXUTEBZ-UHFFFAOYSA-N C=CC=C.OC(C#N)=C Chemical compound C=CC=C.OC(C#N)=C BSUDZBWVXUTEBZ-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- CHDFNIZLAAFFPX-UHFFFAOYSA-N ethoxyethane;oxolane Chemical compound CCOCC.C1CCOC1 CHDFNIZLAAFFPX-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 125000002560 nitrile group Chemical group 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Abstract
The invention discloses a reactive polyurethane hot melt adhesive which comprises the following components in parts by weight: 15-35 parts of crystalline polyester polyol; 15-30 parts of non-crystalline polyester polyol; 10-30 parts of polyether polyol; 10-20 parts of acrylic resin; 10-30 parts of isocyanate; 0-1 part of silane coupling agent; 0-1 part of a catalyst; 5-20 parts of modified hydroxyl-terminated butadiene-acrylonitrile rubber; the modified hydroxyl-terminated nitrile rubber is prepared by the following raw material components through reaction: toluene diisocyanate, nitrile rubber and PDP-70 polyester polyol. The invention also provides a preparation method of the reactive polyurethane hot melt adhesive. The reactive polyurethane hot melt adhesive provided by the invention has excellent high-temperature creep property and good impact resistance.
Description
Technical Field
The invention relates to the technical field of polyurethane, in particular to a reactive polyurethane hot melt adhesive and a preparation method thereof.
Background
The reactive polyurethane hot melt adhesive is solid at room temperature, but is melted under the heating condition, is coated in a liquid or fluid state, is contacted with a second bonding substrate before cooling, can form solid glue with certain bonding strength after cooling, and can be subjected to curing and crosslinking reaction after further reaction with moisture in the air, so that higher final bonding strength is obtained. In addition, the adhesive tape can be sprayed out to a size of less than 0.5mm, and the adhesive tape has the advantages of low odor, low volatility, high strength, high reliability, quick positioning and bonding and the like, so that the adhesive tape is more and more widely applied to the field of consumer electronics.
In a sound box or a loudspeaker in the electronic industry, the vibration of a vibrating diaphragm can cause the use environment to be a high-temperature environment, the temperature can often reach 80 ℃, if the strength attenuation is large at high temperature, poor bonding can be caused in the use process, degumming is caused, and bonding failure is caused.
The strength attenuation of the polyurethane hot melt adhesive at high temperature is larger due to the adopted conventional raw materials, the strength attenuation at the high temperature of 85 ℃ can reach 80% at most compared with the strength attenuation at normal temperature, and the lower strength is difficult to ensure good bonding effect and creep deformation effect. According to the formula of a plurality of polyurethane hot melt adhesives, polycarbonate dihydric alcohol is added, the cross-linking density is improved, and a benzene ring rigid group is introduced to increase the strength at high temperature and reduce the attenuation of the strength along with the temperature.
Therefore, the development of a glue which can maintain higher strength at high temperature and has good impact resistance is an urgent need in the field and has great market potential.
Disclosure of Invention
The invention aims to solve the technical problems of high strength attenuation and poor impact resistance of the polyurethane hot melt adhesive at high temperature in the prior art. The invention provides a reactive polyurethane hot melt adhesive and a preparation method thereof, which can be used for preparing the reactive polyurethane hot melt adhesive which can keep higher strength at high temperature and has good impact resistance.
In order to solve the technical problems, the embodiment of the invention discloses a reactive polyurethane hot melt adhesive which comprises the following components in parts by weight:
the modified hydroxyl-terminated nitrile rubber is prepared by the following raw material components through reaction:
toluene diisocyanate, nitrile rubber and PDP-70 polyester polyol.
According to another specific embodiment of the invention, the embodiment of the invention discloses a reactive polyurethane hot melt adhesive, and the modified hydroxyl-terminated nitrile rubber is prepared by the following method:
dehydrating the hydroxyl-terminated nitrile rubber, gradually adding the dehydrated hydroxyl-terminated nitrile rubber into toluene diisocyanate at 100 ℃ within 20 minutes, and heating to 120 ℃ for reaction for 1 hour after the addition is finished; then adding the PDP-70 polyester polyol, and reacting for 1 hour; and after the reaction is finished, cooling, and sealing and storing to obtain the modified hydroxyl-terminated butadiene-acrylonitrile rubber.
According to another embodiment of the invention, the invention discloses a reactive polyurethane hot melt adhesive, wherein the crystalline polyester polyol is one or two of the group consisting of Dynacoll 7330, Dynacoll 7340, Dynacoll 7360, Dynacoll 7380 and Dynacoll 7390.
According to another embodiment of the invention, the invention discloses a reactive polyurethane hot melt adhesive, and the non-crystalline polyester polyol is one or two selected from the group consisting of Dynacoll 7250, Dynacoll 7255, Asahi Sichuan chemical FLP2000N, Stramapan PD-56 and PDP-70.
According to another specific embodiment of the invention, the embodiment of the invention discloses a reactive polyurethane hot melt adhesive, and the polyether polyol is a polyol with a polyether structure as a main repeating chain unit, and is selected from one or two of polypropylene glycol, polytetrahydrofuran ether glycol and polymethyl tetrahydrofuran ether glycol. PPG1000, PPG2000, PTMG1000, PTMG2000 are preferred.
According to another embodiment of the present invention, there is disclosed a reactive polyurethane hot melt adhesive, the acrylic resin including, but not limited to, polymers or copolymers of alkyl acrylates or methacrylates;
the silane coupling agent comprises one or more of but not limited to KH560, KH550, y-9669, A-189, mercaptopropyltrimethoxysilane and ALINK 597;
the isocyanate includes but is not limited to one or two of toluene diisocyanate, diphenyl diisocyanate, 1, 6 hexamethylene diisocyanate and isophorone diisocyanate;
the catalyst comprises one or two of dibutyltin dilaurate, vinylidene octanoate, triethylene diamine and bismaleimido diethyl ether. The addition of the catalyst regulates the synthesis reaction and the final curing speed.
According to another specific embodiment of the invention, the embodiment of the invention discloses a reactive polyurethane hot melt adhesive, and the acrylic resin is selected from one or more of WK502, WK501, BR113, BR115, ELVACITE 2044 and ELVACITE 2927.
The embodiment of the invention also discloses a preparation method of the reactive polyurethane hot melt adhesive, which comprises the following steps:
and (2) dehydrating the crystalline polyester polyol, the non-crystalline polyester polyol, the polyether polyol, the modified hydroxyl-terminated nitrile rubber and the acrylic resin in vacuum at 140 ℃ and under the pressure of-0.095 MPa for 2 hours, cooling to 120 ℃ after dehydration, adding the isocyanate, continuously reacting for 45 minutes, continuously stirring the silane coupling agent and the catalyst for 1-3 hours, defoaming, sealing and packaging to obtain the reactive polyurethane hot melt adhesive.
According to another specific embodiment of the invention, the embodiment of the invention discloses a preparation method of a reactive polyurethane hot melt adhesive, wherein the modified hydroxyl-terminated nitrile rubber is prepared by the following steps:
dehydrating 1mol of hydroxyl-terminated butadiene-acrylonitrile rubber at 100 ℃ for 2 hours, adding 2mol of toluene diisocyanate into a reaction bottle, heating to 100 ℃, adding the dehydrated hydroxyl-terminated butadiene-acrylonitrile rubber in succession within 20 minutes, and heating to 120 ℃ for reaction for 1 hour after the addition is finished; then adding 2.1mol of PDP-70 polyester polyol, and continuing to react for 1 hour after adding; and after the reaction is finished, cooling, and sealing and storing to obtain the modified hydroxyl-terminated butadiene-acrylonitrile rubber.
Compared with the prior art, the invention has the following technical effects:
polybutadiene contains a large number of carbon-carbon double bonds in the main chain, although the double bonds cannot rotate, the single bonds connected with the polybutadiene are easy to rotate, and because the number of atoms or groups connected with the double bonds is less than that of the single bonds, and the distance between non-bonded atoms is longer than that of the single bonds, the interaction force is reduced, and the rotation resistance is small; the polybutadiene is therefore very flexible. The hydroxyl-terminated nitrile rubber is a high-molecular polymer obtained by copolymerizing butadiene and acrylonitrile, and because a nitrile group is introduced into a main chain, the compatibility with a polyurethane chain segment and the adhesion to a base material are improved;
according to the invention, the hydroxyl acrylonitrile-butadiene rubber at the opposite end is modified, so that the compatibility with a polyurethane chain segment and the adhesion to a base material are improved, meanwhile, the performance difference and the glue spraying smoothness are not generated, and in addition, the excellent performance brought by the acrylonitrile-butadiene rubber can be ensured;
the reactive polyurethane hot melt adhesive prepared by the invention has the advantages of reduced strength attenuation at high temperature and good impact resistance.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following performance tests were performed:
1. adhesion Strength test
The selected base material: PC + 20% GF;
and (3) testing the drawing strength: a circular glue line of area 60um 2;
stretching speed: 10 mm/min;
curing conditions are as follows: curing for 72 hours at 25 ℃ and 50% humidity;
testing the environmental temperature: 25 ℃ and 85 ℃;
2. dupont impact test
Making the glue into a sheet with the thickness of 0.5mm, soaking the sheet in oleic acid, and placing the oleic acid in an oven at 65 ℃ for 24 hours.
The specific implementation scheme is as follows:
example 1:
weighing Dynacoll 736090 g, polyether polyol PPG 200060 g, Asahchuan chemical polyester polyol FLP2000N 40g, modified hydroxyl-terminated butadiene-acrylonitrile rubber 20g in a reaction kettle, acrylic resin 259540 g, dehydrating at 140 ℃ under reduced pressure for 2h, then reducing the temperature to 100 ℃, adding 40g MDI, heating to 120 ℃, continuing to react for 45 minutes, then adding mercaptopropyl trimethoxy silane 1g and catalyst DMDEE 0.6g, and continuing to react for 45 minutes. Then the nitrogen is broken into vacuum, and the mixture is filled into a special sealed container while the mixture is hot and waits for testing.
Example 2:
weighing Dynacoll 736090 g, polyether polyol PPG 200060 g, Asahchuan chemical polyester polyol FLP2000N 40g, modified hydroxyl-terminated butadiene-acrylonitrile rubber 40g in a reaction kettle, acrylic resin 259540 g, dehydrating at 140 ℃ under reduced pressure for 2h, then reducing the temperature to 100 ℃, adding 41g of MDI, heating to 120 ℃, continuing to react for 45 minutes, then adding mercaptopropyl trimethoxy silane 1g and catalyst DMDEE 0.6g, and continuing to react for 45 minutes. Then the nitrogen is broken into vacuum, and the mixture is filled into a special sealed container while the mixture is hot and waits for testing.
Example 3:
weighing 736090 g of Dynacoll, PPG 200060 g g of polyether polyol, FLP2000N 60g of Asahchuan chemical polyester polyol, 40g of modified hydroxyl-terminated nitrile rubber in a reaction kettle, 259540 g of acrylic resin, dehydrating for 2h at 140 ℃ under reduced pressure, then reducing the temperature to 100 ℃, adding 46g of MDI, raising the temperature to 120 ℃, continuing to react for 45 minutes, then adding 1g of mercaptopropyl trimethoxy silane and 0.6g of catalyst DMDEE, and continuing to react for 45 minutes. Then the nitrogen is broken into vacuum, and the mixture is filled into a special sealed container while the mixture is hot and waits for testing.
Example 4:
weighing 736090 g of Dynacoll, PPG 200040 g g of polyether polyol, FLP2000N 60g of Asahuan chemical polyester polyol, 41g of modified hydroxyl-terminated butadiene-acrylonitrile rubber in a reaction kettle, 259540 g of acrylic resin, dehydrating for 2h at 140 ℃ under reduced pressure, then reducing the temperature to 100 ℃, adding 41g of MDI, heating to 120 ℃, continuing to react for 45 minutes, then adding 1g of mercaptopropyl trimethoxy silane and 0.6g of catalyst DMDEE, and continuing to react for 45 minutes. Then the nitrogen is broken into vacuum, and the mixture is filled into a special sealed container while the mixture is hot and waits for testing.
Comparative example 1:
weighing 736090 g of Dynacoll, PPG 200040 g g of polyether polyol, FLP2000N 60g of Asahchuan chemical polyester polyol, 46g of hydroxyl-terminated liquid nitrile rubber in a reaction kettle, 259540 g of acrylic resin, dehydrating for 2 hours at 140 ℃ under reduced pressure, then reducing the temperature to 100 ℃, adding 48g of MDI, heating to 120 ℃, continuing to react for 45 minutes, then adding 1g of mercaptopropyl trimethoxysilane and 0.6g of catalyst DMDEE, and continuing to react for 45 minutes. Then the nitrogen is broken into vacuum, and the mixture is filled into a special sealed container while the mixture is hot and waits for testing.
The hot melt adhesives obtained in examples 1 to 5 and comparative example 1 were tested and the results are shown in Table 1.
Table 1 results of performance testing
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | |
| Spray glue | Fluency | Fluency | Fluency | Fluency | Easy-to-glue |
| Shear strength at 25 ℃ in MPa | 9.5 | 9 | 12 | 8.6 | 6.9 |
| Shear strength at 85 ℃ in MPa | 3.9 | 4.6 | 4.9 | 4.6 | 2.6 |
| Dupont impact/times | 72 | 90 | 102 | 60 | 90 |
While the invention has been described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more particular description of the invention than is possible with reference to the specific embodiments, which are not to be construed as limiting the invention. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A reactive polyurethane hot melt adhesive is characterized by comprising the following components in parts by weight:
the modified hydroxyl-terminated nitrile rubber is prepared by the following raw material components through reaction:
toluene diisocyanate, nitrile rubber and PDP-70 polyester polyol.
2. The reactive polyurethane hot melt adhesive of claim 1, wherein the modified hydroxyl-terminated nitrile rubber is prepared by the following method:
dehydrating the hydroxyl-terminated nitrile rubber, gradually adding the dehydrated hydroxyl-terminated nitrile rubber into toluene diisocyanate at 100 ℃ within 20 minutes, and heating to 120 ℃ for reaction for 1 hour after the addition is finished; then adding the PDP-70 polyester polyol, and reacting for 1 hour; and after the reaction is finished, cooling, and sealing and storing to obtain the modified hydroxyl-terminated butadiene-acrylonitrile rubber.
3. The reactive polyurethane hot melt adhesive of claim 1, wherein the crystalline polyester polyol is selected from one or two of the group consisting of Dynacoll 7330, Dynacoll 7340, Dynacoll 7360, Dynacoll 7380, and Dynacoll 7390.
4. The reactive polyurethane hot melt adhesive of claim 1, wherein the non-crystalline polyester polyol is one or two selected from the group consisting of Dynacoll 7250, Dynacoll 7255, asahi chemical FLP2000N, stainppan PD-56, and PDP-70.
5. The reactive polyurethane hot melt adhesive according to claim 1, wherein the polyether polyol is a polyol having a polyether structure as a main repeating chain unit, and the polyether polyol is one or two selected from polypropylene glycol, polytetrahydrofuran ether glycol and polymethyltetrahydrofuran ether glycol.
6. The reactive polyurethane hot melt adhesive of claim 1, wherein said acrylic resins include, but are not limited to, polymers or copolymers of alkyl acrylates or methacrylates;
the silane coupling agent comprises one or more of but not limited to KH560, KH550, y-9669, A-189, mercaptopropyltrimethoxysilane and ALINK 597;
the isocyanate includes but is not limited to one or two of toluene diisocyanate, diphenyl diisocyanate, 1, 6 hexamethylene diisocyanate and isophorone diisocyanate;
the catalyst comprises one or two of dibutyltin dilaurate, vinylidene octanoate, triethylene diamine and bismaleimido diethyl ether.
7. The reactive polyurethane hot melt adhesive of claim 6, wherein the acrylic resin is selected from one or more of WK502, WK501, BR113, BR115, ELVACITE 2044 and ELVACITE 2927.
8. A method for preparing the reactive polyurethane hot melt adhesive according to any one of claims 1 to 7, which is characterized by comprising the following steps:
and (2) dehydrating the crystalline polyester polyol, the non-crystalline polyester polyol, the polyether polyol, the modified hydroxyl-terminated nitrile rubber and the acrylic resin in vacuum at 120 ℃ and under the pressure of-0.095 MPa for 2 hours, adding the isocyanate, the silane coupling agent and the catalyst after the dehydration is finished, continuously stirring for 1-3 hours, defoaming, sealing and packaging to obtain the reactive polyurethane hot melt adhesive.
9. The preparation method of the reactive polyurethane hot melt adhesive according to claim 8, wherein the modified hydroxyl-terminated nitrile rubber is prepared by the following method:
dehydrating 1mol of hydroxyl-terminated butadiene-acrylonitrile rubber at 100 ℃ for 2 hours, adding 2mol of toluene diisocyanate into a reaction bottle, heating to 100 ℃, adding the dehydrated hydroxyl-terminated butadiene-acrylonitrile rubber in succession within 20 minutes, and heating to 120 ℃ for reaction for 1 hour after the addition is finished; then adding 2.1mol of PDP-70 polyester polyol, and continuing to react for 1 hour after adding; and after the reaction is finished, cooling, and sealing and storing to obtain the modified hydroxyl-terminated butadiene-acrylonitrile rubber.
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| CN115851213A (en) * | 2022-12-26 | 2023-03-28 | 广州市白云化工实业有限公司 | Reactive polyurethane hot melt adhesive for nitrile rubber bonding and preparation method thereof |
Citations (5)
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| CN115851213A (en) * | 2022-12-26 | 2023-03-28 | 广州市白云化工实业有限公司 | Reactive polyurethane hot melt adhesive for nitrile rubber bonding and preparation method thereof |
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