CN115044317B - Preparation method and product of double-sided self-adhesive polyurethane foam - Google Patents
Preparation method and product of double-sided self-adhesive polyurethane foam Download PDFInfo
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- CN115044317B CN115044317B CN202210752145.1A CN202210752145A CN115044317B CN 115044317 B CN115044317 B CN 115044317B CN 202210752145 A CN202210752145 A CN 202210752145A CN 115044317 B CN115044317 B CN 115044317B
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- release film
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- 239000000853 adhesive Substances 0.000 title claims abstract description 100
- 229920005830 Polyurethane Foam Polymers 0.000 title claims abstract description 30
- 239000011496 polyurethane foam Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 79
- 239000011248 coating agent Substances 0.000 claims abstract description 63
- 238000000576 coating method Methods 0.000 claims abstract description 63
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 63
- 238000005187 foaming Methods 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 52
- 229920002635 polyurethane Polymers 0.000 claims abstract description 47
- 239000004814 polyurethane Substances 0.000 claims abstract description 47
- 239000006260 foam Substances 0.000 claims abstract description 42
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 25
- -1 acrylic ester Chemical class 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000002981 blocking agent Substances 0.000 claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 28
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims description 20
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 14
- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 9
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 8
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000004088 foaming agent Substances 0.000 claims description 7
- 239000003999 initiator Substances 0.000 claims description 7
- 238000010526 radical polymerization reaction Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 7
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 6
- JJRDRFZYKKFYMO-UHFFFAOYSA-N 2-methyl-2-(2-methylbutan-2-ylperoxy)butane Chemical compound CCC(C)(C)OOC(C)(C)CC JJRDRFZYKKFYMO-UHFFFAOYSA-N 0.000 claims description 6
- WYKYCHHWIJXDAO-UHFFFAOYSA-N tert-butyl 2-ethylhexaneperoxoate Chemical compound CCCCC(CC)C(=O)OOC(C)(C)C WYKYCHHWIJXDAO-UHFFFAOYSA-N 0.000 claims description 6
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 claims description 6
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 claims description 5
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 5
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 5
- OIWOHHBRDFKZNC-UHFFFAOYSA-N cyclohexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC1CCCCC1 OIWOHHBRDFKZNC-UHFFFAOYSA-N 0.000 claims description 5
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims description 5
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 5
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 5
- 229940090181 propyl acetate Drugs 0.000 claims description 5
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 claims description 5
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 14
- 239000012790 adhesive layer Substances 0.000 abstract description 5
- 239000003292 glue Substances 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 12
- 239000005020 polyethylene terephthalate Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000011888 foil Substances 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 238000004026 adhesive bonding Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical group NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012994 photoredox catalyst Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/26—Porous or cellular plastics
-
- 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
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
-
- 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
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/24—Presence of a foam
- C09J2400/243—Presence of a foam in the substrate
-
- 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
- C09J2475/00—Presence of polyurethane
- C09J2475/006—Presence of polyurethane in the substrate
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a preparation method and a product of double-sided self-bonding polyurethane foam, belonging to the field of foaming materials, and comprising the following steps: and S1, preparing a polyacrylate adhesive by taking acrylic ester as a main polymer body, then blocking the polyacrylate adhesive by using a blocking agent to prepare a polyacrylate adhesive with a hydroxyl-containing end group, coating the polyacrylate adhesive with the hydroxyl-containing end group prepared in the step S1 on one surface of a release film by S2, coating polyurethane A, B two-component foaming materials between the release films prepared in the step S2 on two layers of release films by S3, and positioning the polyurethane A, B two-component foaming materials between two opposite surfaces with the adhesive on the release film. The invention also provides a product prepared by the method. The invention realizes molecular link between the adhesive and the polyurethane foam body through novel and smart process method and material combination, and solves the problems of weak bonding force, glue overflow and coating missing between the traditional adhesive layer and foam.
Description
Technical Field
The invention belongs to the field of foaming materials, and particularly relates to double-sided self-bonding polyurethane foam and a preparation method thereof.
Background
Polyurethane foam is increasingly widely applied in the 3C industry due to the unique compression resistance, filling support and dimensional stability, becomes an indispensable material gradually, and provides excellent auxiliary functions for the normal function of electronic components.
The density range of the polyurethane foam currently used covers 150kg/m 3～500kg/m3, most of the polyurethane foam is delivered in the form of coiled materials, the polyurethane foam is used after die cutting, and the die cutting process needs to carry out single-sided or double-sided back adhesive, namely, the adhesive tape with the surface (single-sided or double-sided) coated with the adhesive is compounded with the die-cut foam. Due to the difference of the surface energy of the foam or the local position inconsistency of the surface energy of a PET layer (the conventional foam foams on the PET film) carrying the foam on the back, the adverse phenomena of inconsistent binding force, middle air inlet bulge, small range wrinkles and the like often occur. Meanwhile, in the field of self-bonding of the two sides, the double-sided adhesive tape on the upper surface and the lower surface of the foam is required to be attached, and as the double-sided adhesive tape is a layer of PET or paper-based bearing material, the hardness and the function release of the foam are affected, and the normal performance of the conventional foam is restricted. In addition, some applications use an acrylate adhesive to coat the foam surface and then use the foam, namely, the foam adhesive tape is manufactured. However, the polyurethane foam in the gluing process needs to be integrated with PET, and gluing is performed under the condition that a substrate is used as a substrate, so that a product with only single foam double-sided gluing is difficult to prepare. Meanwhile, the adhesive layer is only physically combined on the surface of the foam or the PET surface, chemical reaction is not involved, the combining force is generally weak, and phenomena of adhesive overflow and coating missing are easy to occur.
Therefore, the problem of glue overflow and missing coating in the current single-double sided adhesive bonding and foam gluing process is solved, the problem of connection between polyurethane and acrylic ester molecular level is required to be solved, and only then the performance advantage of the existing polyurethane foam can be better exerted, and the bonding and the fixation of the foam and devices are realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method and a product of double-sided self-adhesive polyurethane foam, which are characterized in that molecular links are generated between an adhesive and a polyurethane foam body through novel and smart technological methods and structural combinations, the prepared foam does not need to carry out secondary back adhesive or adhesive coating to realize double-sided self-adhesive, and the problems of weak bonding force, glue overflow and coating leakage between the traditional adhesive layer and foam are eliminated.
In order to achieve the above purpose, the invention provides a preparation method of double-sided self-adhesive polyurethane foam, which comprises the following steps:
s1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups,
S2: coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step S1, on one surface of the release film,
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive.
In step S1, the acrylate is one or more of ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, and cyclohexyl methacrylate, and the end-capping agent is one or more of allyl alcohol, hydroxyethyl acrylate, and hydroxypropyl acrylate.
In step S1, one or more of ethyl acetate, butyl acetate and propyl acetate are used as solvents in the synthesis process of the polyacrylate adhesive with the hydroxyl-containing end groups, and one of tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate and di-tert-amyl peroxide is used as an initiator for free radical polymerization.
Further, in the step S1, the solid content in the polyacrylate adhesive with the terminal group containing hydroxyl groups is 25-35 wt%.
In the step S1, the release film is an organosilicon coating release film, the thickness of the release film is 50-75 μm, the coating thickness is 50-110 μm, the release film is made of PET (polyethylene terephthalate), PC (polycarbonate) or PBT (polybutylene terephthalate), and the drying temperature after the coating is 120-140 ℃.
Further, in step S3, the coating mass ratio of the polyurethane A, B two-component foaming material is 100: (101-105), wherein the component B contains isocyanate groups, and the excessive isocyanate groups are used for reacting with hydroxyl groups contained in the end groups of the polyacrylate adhesive, so that the components can be crosslinked into a whole. In fact, from a theoretical point of view, the polyurethane A, B two-component foaming material is a conventional polyether two-component foaming material, and the coating mass ratio of A, B two components is 100:100, i.e., the ratio of hydroxyl groups to isocyanate groups is 1:1, but in actual engineering time, component B is often present in a slight excess.
Further, in step S3, in the polyurethane A, B two-component foaming material, the foaming agent is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 200KG/m 3～400KG/m3.
Further, in the step S3, the coating thickness of the polyurethane A, B two-component foaming material is 0.1 mm-0.5 mm after mixing, the heating and curing temperature is 110-120 ℃, and the heating and curing time is 15-20 min.
According to a second aspect of the present invention, there is also provided a double-sided self-adhesive polyurethane foam prepared by the preparation method as described above.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
The invention creates the acrylate adhesive with the end group containing the hydroxyl, so that the bonding between the isocyanate group in the polyurethane molecular structure and the hydroxyl in the adhesive is possible, and finally the polyurethane and the polyacrylate are linked into a unified whole. The liquid double-component polyurethane foaming material is foamed between the double-layer release films coated with the hydroxyl-terminated polyacrylate, is solidified and molded, and enables the final foam to have double-sided self-adhesion property through interfacial transfer, and has simple process and excellent effect; and the procedures of back coating and gluing are thoroughly avoided, and the material is endowed with good processing and using performances.
The foam material disclosed by the invention is different from the conventional method that a single-sided adhesive and a double-sided adhesive are compounded on the surface of foam, and is also different from the method that a common polyacrylate adhesive is coated on the surface of foam, wherein polyacrylate containing hydroxyl in an end group is firstly coated into a film, and then a double-component liquid polyurethane component material is uniformly coated between two layers of film materials, wherein excessive isocyanate groups can chemically react with residual hydroxyl components in the polyacrylate to generate carbamate groups, a final foaming layer and an adhesive layer become an organic whole to form unified macromolecules, an interface structure similar to an ABA (architecture) is formed, and an interface of an A layer in the structure are transferred by virtue of a release film of organic silicon and are singly present to form a complete interface, so that the final polyurethane foam has a unique upper interface layer and a unique lower interface layer, and double-sided self-bonding is realized.
Drawings
Fig. 1 is a schematic diagram of a preparation method of a double-sided self-adhesive polyurethane foam provided by an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention discloses a preparation method of double-sided self-adhesive polyurethane foam, which mainly comprises the following steps of S1: taking acrylic ester as a main polymer body, and blocking with a blocking agent to prepare a polyacrylate adhesive with a hydroxyl-containing end group; s2: coating polyacrylate adhesives with hydroxyl groups at the end groups synthesized in the step S1 on the surface of the release film respectively for standby; s3: and (2) coating polyurethane A, B bi-component foaming materials between the two release films coated with the adhesive in the step (S2) for foaming. In the foaming process of the self-adhesive foam, excessive isocyanate groups react with residual hydroxyl groups in the polyacrylate adhesive layers on the upper and lower film substrates to form a whole, so that the upper and lower surfaces of the final polyurethane foam are provided with the acrylate modified layers, and the self-adhesive property is realized.
Fig. 1 is a schematic diagram of a preparation method of a double-sided self-adhesive polyurethane foam according to an embodiment of the present invention, and the method of the present invention includes the following steps:
S1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, and then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups. In the step S1, the acrylic ester is one or more of ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate and cyclohexyl methacrylate, and the end capping agent is one or more of allyl alcohol, hydroxyethyl acrylate and hydroxypropyl acrylate. In the synthesis process of the polyacrylate adhesive with the hydroxyl-containing end groups, one or more of ethyl acetate, butyl acetate and propyl acetate are adopted as solvents, and the solid content in the polyacrylate adhesive with the hydroxyl-containing end groups is 25-35 wt%. One of tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate and di-tert-amyl peroxide is used as an initiator for free radical polymerization.
S2: and (3) coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step (S1), on one surface of the release film. The release film is an organosilicon coating release film, the thickness of the release film is 50-75 mu m, the coating thickness is 50-110 mu m, the release film is made of PET, PC or PBT, and the drying temperature after the coating is 120-140 ℃.
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive. The coating mass ratio of the polyurethane A, B two-component foaming material is 100: (101-105), wherein the component B contains isocyanate groups, and the excessive isocyanate groups are used for reacting with hydroxyl groups contained in the end groups of the polyacrylate adhesive, so that the component B can be crosslinked into a whole. In the polyurethane A, B double-component foaming material, the foaming agent is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 200KG/m 3～400KG/m3. The coating thickness of the polyurethane A, B double-component foaming material is 0.1 mm-0.5 mm after mixing, the heating curing temperature is 110-120 ℃, and the heating curing time is 15-20 min.
For a more detailed description of the process according to the invention, reference is made further to the following specific examples and comparative examples.
Example 1:
(a) Synthesizing a polyacrylate adhesive containing end groups: 100g (or integer times of 100g, the same applies below) of ethyl acetate is adopted as a solvent, 29g of ethyl acrylate and 0.01g of tert-butyl peroxybenzoate are added, the mixture is prepolymerized for 2 hours at 50 ℃, then 1g of allyl alcohol is added for end capping, and then the mixture is prepolymerized for 1 hour for later use.
(B) And (3) coating the hydroxyl-terminated polyacrylate adhesive synthesized in the step (a) with the thickness of 50 mu m on a PET release film with the thickness of 50 mu m, and drying at 130 ℃ for later use.
(C) A, B two-component polyurethane with the density of 200kg/m 3 is mixed according to the proportion of 100:101 (namely, the excess of isocyanate groups is 1 percent), then the mixture is coated in the release film interlayer in the step (b) according to the thickness of 0.1mm, and the mixture is transferred to an oven at 110 ℃ for curing for 15 minutes after finishing.
(D) Taking out the foam cured in the step (c), cutting the foam into strips with the width of 25mm, peeling off the release film, adhering the release film on an aluminum foil and a steel plate, performing 180-degree peeling test, and peeling off the foam pore layer with the peeling force of 550gf/25 mm.
Comparative example 1:
The two-component material in step (c) of example 1 was directly foamed between the release films in (b), and the prepared foam was cut into 25mm pieces as well, attached to an aluminum foil and a steel plate, and subjected to 180 ° peel test with a peel force of 25gf/25mm, and peeled off at the interface of the foam and the aluminum foil or the steel plate without damaging the foam.
Example 2:
(a) Synthesizing a polyacrylate adhesive containing end groups: 100g (or integral multiple of 100g, the same applies below) of propyl acetate is adopted as a solvent, 29g (the proportions are 5, 5 and 9 g) of ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, cyclohexyl methacrylate and 0.01g of tert-butyl peroxy-2-ethylhexanoate are added for prepolymerization for 2h at 70 ℃, then 1g of hydroxyethyl acrylate is added for end sealing, and then prepolymerization is carried out for 1h for standby.
(B) And (3) coating the hydroxyl-terminated polyacrylate adhesive synthesized in the step (a) with the thickness of 110 mu m on a PET release film with the thickness of 75 mu m, and drying at 130 ℃ for later use.
(C) A, B two-component polyurethane with the density of 400kg/m 3 is mixed according to the proportion of 100:105 (namely, the excess of isocyanate groups is 5 percent), then the mixture is coated in the release film interlayer in the step (b) according to the thickness of 0.5mm, and the mixture is transferred to a baking oven at 120 ℃ for curing for 20 minutes after finishing.
(D) Taking out the foam cured in the step (c), cutting the foam into strips with the width of 25mm, peeling off the release film, adhering the release film on an aluminum foil and a steel plate, performing 180-degree peeling test, and peeling off the foam pore layer with the peeling force of 1380gf/25 mm.
Comparative example 2:
The two-component material in step (c) of example 2 was directly foamed between the release films in (b), and the prepared foam was cut into 25mm pieces as well, attached to an aluminum foil and a steel plate, and subjected to 180 ° peel test with a peel force of 75gf/25mm, peeled off at the interface of the foam and the aluminum foil or the steel plate, and the foam was not damaged.
Example 3:
(a) Synthesizing a polyacrylate adhesive containing end groups: 100g (or integer times of 100g, the same applies below) of butyl acetate is adopted as a solvent, 29g (the proportions are 14.5 and 14.5 g) of ethyl acrylate, 29g (methyl cyclohexyl acrylate) and 0.01g of di-tertiary amyl peroxide are added for prepolymerization for 2 hours at 90 ℃, then 1g of hydroxypropyl acrylate is added for end capping, and then prepolymerization is carried out for 1 hour for standby.
(B) Coating the end hydroxyl polyacrylate adhesive synthesized in the step (a) with the thickness of 75 μm on a 60 μm PET release film, and drying at 130 ℃ for later use.
(C) A, B two-component polyurethane with the density of 300kg/m 3 is mixed according to the proportion of 100:103 (namely, the excess of isocyanate groups is 3 percent), then the mixture is coated in the release film interlayer in the step (b) according to the thickness of 0.3mm, and the mixture is transferred to an oven at 115 ℃ for curing for 18 minutes after finishing.
(D) Taking out the foam cured in the step (c), cutting the foam into strips with the width of 25mm, peeling off the release film, adhering the release film on an aluminum foil and a steel plate, performing 180-degree peeling test, and peeling off the foam pore layer with the peeling force of 820gf/25 mm.
Comparative example 3: the two-component material in step (c) of example 3 was directly foamed between the release films in (b), and the prepared foam was cut into 25mm pieces as well, attached to an aluminum foil and a steel plate, and subjected to 180 ° peel test with a peel force of 40gf/25mm, peeled off at the interface of the foam and the aluminum foil or the steel plate, and the foam was not damaged.
From the above examples, it is evident that the prepared double-sided self-adhesive polyurethane foam has an obvious bonding effect at two interfaces, and the bonding force is obviously greater than the cohesive force of the foam pore layer.
Example 4:
S1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, and then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups. In the step S1, the acrylic ester is ethyl acrylate, and the end capping agent is allyl alcohol. In the synthesis process of the polyacrylate adhesive with the hydroxyl-containing end groups, ethyl acetate is used as a solvent, and the solid content in the polyacrylate adhesive with the hydroxyl-containing end groups is 25wt%. Di-tert-amyl peroxide was used as an initiator for free radical polymerization.
S2: and (3) coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step (S1), on one surface of the release film. The release film is an organosilicon coating release film, the thickness of the release film is 50 mu m, the coating thickness is 90 mu m, the release film is made of PET, and the drying temperature after the coating is finished is 125 ℃.
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive. The coating mass ratio of the polyurethane A, B two-component foaming material is 100:101. in the polyurethane A, B double-component foaming material, the foaming agent is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 325KG/m 3. The coating thickness of the polyurethane A, B double-component foaming material is 0.1mm after mixing, the heating curing temperature is 118 ℃, and the heating curing time is 17min.
Example 5
S1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, and then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups. In the step S1, the acrylic ester is ethyl methacrylate and cyclohexyl methacrylate, and the end capping agent is hydroxyethyl acrylate. In the synthesis process of the polyacrylate adhesive with the terminal group containing hydroxyl, the polyacrylate adhesive with the terminal group containing hydroxyl has the solid content of 35 weight percent by adopting propyl acetate as a solvent. Tert-butyl peroxy-2-ethylhexanoate is used as an initiator for radical polymerization.
S2: and (3) coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step (S1), on one surface of the release film. The release film is an organosilicon coating release film, the thickness of the release film is 75 mu m, the coating thickness is 100 mu m, the release film is made of PBT, and the drying temperature after the coating is finished is 130 ℃.
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive. The coating mass ratio of the polyurethane A, B two-component foaming material is 100:105. in the polyurethane A, B double-component foaming material, the foaming agent is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 300KG/m 3. The coating thickness of the polyurethane A, B double-component foaming material is 0.5mm after mixing, the heating curing temperature is 115 ℃, and the heating curing time is 18min.
Example 6:
s1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, and then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups. In the step S1, the acrylic ester is methyl methacrylate, and the end capping agent is hydroxypropyl acrylate. In the synthesis process of the polyacrylate adhesive with the hydroxyl-containing end groups, butyl acetate is used as a solvent, and the solid content in the polyacrylate adhesive with the hydroxyl-containing end groups is 30 weight percent. One of tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate and di-tert-amyl peroxide is used as an initiator for free radical polymerization.
S2: and (3) coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step (S1), on one surface of the release film. The release film is an organosilicon coating release film, the thickness of the release film is 60 mu m, the coating thickness is 110 mu m, the release film is made of PC, and the drying temperature after the coating is finished is 140 ℃.
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive. The coating mass ratio of the polyurethane A, B two-component foaming material is 100:103. in the polyurethane A, B double-component foaming material, the foaming agent is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 400KG/m 3. The coating thickness of the polyurethane A, B double-component foaming material is 0.4mm after mixing, the heating curing temperature is 120 ℃, and the heating curing time is 15min.
Example 7:
s1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, and then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups. In the step S1, the acrylic ester is ethyl acrylate and propyl acrylate, and the end capping agent is hydroxyethyl acrylate. In the synthesis process of the polyacrylate adhesive with the hydroxyl-containing end groups, ethyl acetate is adopted, and the solid content in the polyacrylate adhesive with the hydroxyl-containing end groups is 33 weight percent. Tert-butyl peroxybenzoate is used as an initiator for radical polymerization.
S2: and (3) coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step (S1), on one surface of the release film. The release film is an organosilicon coating release film, the thickness of the release film is 65 mu m, the coating thickness is 50 mu m, the release film is made of PET, and the drying temperature after the coating is finished is 120 ℃.
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive. The coating mass ratio of the polyurethane A, B two-component foaming material is 100:104. in the polyurethane A, B double-component foaming material, the foaming agent is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 200KG/m 3. The coating thickness of the polyurethane A, B double-component foaming material is 0.2mm after mixing, the heating curing temperature is 110 ℃, and the heating curing time is 20min.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The preparation method of the double-sided self-adhesive polyurethane foam is characterized by comprising the following steps of:
s1: the polyacrylate adhesive is prepared by taking acrylic ester as a main polymer body, then the polyacrylate adhesive is blocked by a blocking agent to prepare the polyacrylate adhesive with hydroxyl-containing end groups,
The end capping agent is one or more of allyl alcohol, hydroxyethyl acrylate and hydroxypropyl acrylate,
S2: coating the polyacrylate adhesive with the end group containing hydroxyl group, which is prepared in the step S1, on one surface of the release film,
S3: and (2) coating polyurethane A, B and a two-component foaming material between the release films prepared in the two steps S2, wherein the polyurethane A, B and the two-component foaming material are positioned between two opposite surfaces of the release film with adhesive.
2. The method for preparing double-sided self-adhesive polyurethane foam according to claim 1, wherein in the step S1, the acrylic ester is one or more of ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate and cyclohexyl methacrylate.
3. The method for preparing double-sided self-adhesive polyurethane foam according to claim 2, wherein in the step S1, one or more of ethyl acetate, butyl acetate and propyl acetate are used as solvents and one of tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate and di-tert-amyl peroxide is used as an initiator for free radical polymerization in the synthesis process of the polyacrylate adhesive with hydroxyl groups at the end groups.
4. A method for producing a double-sided self-adhesive polyurethane foam according to claim 3, wherein in step S1, the solid content in the polyacrylate adhesive having hydroxyl groups at the end groups is 25wt.% to 35wt.%.
5. The method of producing double-sided self-adhesive polyurethane foam according to claim 4, wherein in the step S1, the release film is an organosilicon coating release film, the thickness of the release film is 50 μm-75 μm, the coating thickness is 50 μm-110 μm, the release film is made of PET, PC or PBT, and the drying temperature after the coating is 120 ℃ to 140 ℃.
6. The method for preparing double-sided self-adhesive polyurethane foam according to any one of claims 1 to 5, wherein in step S3, the coating mass ratio of polyurethane A, B two-component foam is 100: (101-105), wherein the component B contains isocyanate groups, and the excessive isocyanate groups are used for reacting with hydroxyl groups contained in the end groups of the polyacrylate adhesive, so that the component B can be crosslinked into a whole.
7. The method for preparing double-sided self-adhesive polyurethane foam according to claim 6, wherein in the step S3, the foaming agent in the polyurethane A, B double-component foaming material is water, the water reacts with isocyanate groups to release carbon dioxide, the carbon dioxide is used as a foaming air source, and the final foaming density is 200 kg/m-400 kg/m.
8. The method for preparing double-sided self-adhesive polyurethane foam according to claim 7, wherein in the step S3, polyurethane A, B is mixed with a double-component foaming material, the coating thickness is 0.1 mm-0.5 mm, the heating curing temperature is 110-120 ℃, and the heating curing time is 15-20 min.
9. The double-sided self-adhesive polyurethane foam prepared by the preparation method according to any one of claims 1 to 8.
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