CN117624619B - Water-based hyperbranched polyacrylate modifier emulsion, preparation method and application thereof in cracking prevention of plates - Google Patents
Water-based hyperbranched polyacrylate modifier emulsion, preparation method and application thereof in cracking prevention of plates Download PDFInfo
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- 239000000839 emulsion Substances 0.000 title claims abstract description 128
- 229920000058 polyacrylate Polymers 0.000 title claims abstract description 68
- 239000003607 modifier Substances 0.000 title claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000005336 cracking Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000002265 prevention Effects 0.000 title claims abstract description 12
- 239000011120 plywood Substances 0.000 claims abstract description 41
- 238000007731 hot pressing Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 61
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 45
- 239000000123 paper Substances 0.000 claims description 36
- 239000007864 aqueous solution Substances 0.000 claims description 27
- 239000000178 monomer Substances 0.000 claims description 20
- -1 acrylic ester Chemical class 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 229920002635 polyurethane Polymers 0.000 claims description 18
- 239000004814 polyurethane Substances 0.000 claims description 18
- 239000003999 initiator Substances 0.000 claims description 17
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-UHFFFAOYSA-N 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 15
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000002562 thickening agent Substances 0.000 claims description 12
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 10
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical compound CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 claims description 9
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 9
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000012874 anionic emulsifier Substances 0.000 claims description 5
- 239000013530 defoamer Substances 0.000 claims description 5
- 239000012875 nonionic emulsifier Substances 0.000 claims description 5
- 150000004756 silanes Chemical class 0.000 claims description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- JMGZBMRVDHKMKB-UHFFFAOYSA-L disodium;2-sulfobutanedioate Chemical compound [Na+].[Na+].OS(=O)(=O)C(C([O-])=O)CC([O-])=O JMGZBMRVDHKMKB-UHFFFAOYSA-L 0.000 claims description 4
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 238000007774 anilox coating Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 239000003945 anionic surfactant Substances 0.000 claims description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 2
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 2
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 2
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 2
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 claims description 2
- 229920002521 macromolecule Polymers 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000002736 nonionic surfactant Substances 0.000 claims description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 235000017550 sodium carbonate Nutrition 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 229920000587 hyperbranched polymer Polymers 0.000 abstract description 8
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract description 7
- 229910000077 silane Inorganic materials 0.000 abstract description 7
- 125000000524 functional group Chemical group 0.000 abstract description 6
- 239000004593 Epoxy Substances 0.000 abstract description 3
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 abstract description 3
- 125000003277 amino group Chemical group 0.000 abstract description 2
- 230000001808 coupling effect Effects 0.000 abstract description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 13
- 230000004048 modification Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 11
- 239000004094 surface-active agent Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002023 wood Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000011094 fiberboard Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011093 chipboard Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 239000000412 dendrimer Substances 0.000 description 1
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- 239000002655 kraft paper Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
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- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
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- Polymerisation Methods In General (AREA)
Abstract
The invention discloses a water-based hyperbranched polyacrylate modifier emulsion, a preparation method and application thereof in cracking prevention of plates, and the preparation method comprises the following steps: s1, preparing a hyperbranched prepolymer; S2-S4, preparing an aqueous hyperbranched polyacrylate modifier emulsion; the invention utilizes the reaction of the triamine and the binary glycidyl ether to form a water-based hyperbranched prepolymer with amino at the tail end, and then the water-based hyperbranched prepolymer reacts with the polyacrylate emulsion with the epoxy functional group at the side chain to form the water-based hyperbranched polyacrylate emulsion; grafting hyperbranched polyacrylate on the surface of veneer artificial boards such as plywood and the like through silane coupling action to prepare a modified board, so that the hydrophobicity, dimensional stability and flatness of the surface of the board are improved; the impregnated bond paper is faced to the surface of the plate through the hot pressing effect, and the terminal amino groups of the hyperbranched polymer are further inserted between the impregnated bond paper layers to react with free formaldehyde, so that a firm physicochemical effect is formed, the interface binding force is enhanced, and the impregnated bond paper is prevented from cracking.
Description
Technical Field
The invention relates to the technical field of polyacrylate modifier synthesis, in particular to a water-based hyperbranched polyacrylate modifier emulsion, a preparation method and application thereof in cracking prevention of plates.
Background
The impregnated film paper facing artificial board has rich surface color, good visual effect, better wear resistance, heat resistance, cigarette burning resistance, pollution resistance and other performances, and is an important material for indoor furniture decoration. Impregnated bond paper veneer plywood and joinery board (commonly known as ecological board) are used as important members of veneer artificial board, and have been developed rapidly since 2010, and the market share is up to 50% -70%. The product yield in 2018 exceeds 1500 ten thousand m 2, market value is created to be 7000 hundred million yuan, and the product has good application prospect. However, compared with impregnated bond paper facing chipboards and fiber boards, the surface of the facing plywood and core-board is easy to crack and the like in the production and use processes, and the development of the impregnated bond paper facing artificial board is severely restricted. The main reason for this is probably due to the poor surface flatness and dimensional stability of plywood and joinery board, and the weak interfacial bonding force with impregnated bond paper veneer.
The existing solution is mainly to coat a layer of thin fiber board, phenolic resin impregnated kraft paper or recombined decorative veneer between the impregnated adhesive film paper and the base material as a buffer board so as to improve the surface evenness of the base material and reduce cracking caused by unstable surface layer size, but the facing process needs to be paved and hot pressed twice, and the operation is complex (Liu Yifan and the like, chinese artificial board, 2021); or by controlling and reducing the water content of the surface veneer (Chi Yongliang, chinese artificial board, 2017), the product produced by the method is only applicable to areas with small changes of the relative humidity of the environment, and can still generate phenomena such as cracks when being used in areas with large changes of the relative humidity. There are also methods of modifying the impregnating resin and adding flexible long-chain polymer resins such as polyethylene glycol, diallyl phthalate, polyurethane-acrylate (Zhou et al, european Journal of Wood and Wood Products, 2020) to increase the toughness of the impregnating resin, but the viscosity and permeability of the impregnating resin may be affected, resulting in problems of increased impregnating time, uneven impregnation, and the like, affecting the surface quality of the coated paper and veneer. Therefore, the polymer grafting modification of the surfaces of the plywood and the joinery board can improve the dimensional stability of the base material and increase the bonding force of the composite interface.
Hyperbranched polymer is a dendritic polymer with a highly branched structure. Compared with linear polymers, hyperbranched polymers have more molecular branching points, less molecular chain winding, difficult crystallization, high solubility, less influence on the viscosity of a system, and can be provided with a plurality of functional group end groups in the molecule, so that the material can be endowed with more properties after being modified. The water-based hyperbranched polymer is an important branch of the hyperbranched polymer, and has good solubility in water, so that the water can be used as a carrier to modify the material, and the water-based hyperbranched polymer is paid attention to by researchers. Patent No. 201910891448.X discloses a preparation method of aqueous hyperbranched polyacrylate emulsion, which can react with hydroxyl groups of wood through impregnation modification to improve the dimensional stability of the wood.
Therefore, the surface flatness and the dimensional stability are improved by grafting the coating water-based hyperbranched polymer on the surfaces of the plywood and the joinery board and reacting with the surface hydroxyl groups; meanwhile, the hyperbranched terminal group contains a functional group capable of reacting with melamine-formaldehyde resin, and the functional group is inserted into the impregnated bond paper in the hot pressing process, is completely solidified to generate a physical and chemical anchoring effect, so that the interface binding force is enhanced, and the generation of cracks can be prevented.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a water-based hyperbranched polyacrylate modifier emulsion, a preparation method and application thereof in cracking prevention of plates, wherein a water-based hyperbranched prepolymer with amino at the tail end is formed by utilizing the reaction of tertiary amine and binary glycidyl ether, and then the water-based hyperbranched prepolymer is reacted with polyacrylate emulsion with epoxy functional groups on the side chain to be grafted on the polyacrylate, so as to form the water-based hyperbranched polyacrylate emulsion; the hyperbranched polyacrylate is grafted to the surface of veneer artificial boards such as plywood and the like through silane coupling action to prepare the modified board, so that the hydrophobicity, the dimensional stability and the flatness of the surface of the board are improved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the aqueous hyperbranched polyacrylate modifier emulsion comprises the following components in parts by weight:
preferably, the acrylic hard monomer and acrylic soft monomer do not contain benzene ring, hydroxyl, carboxyl, cyano functional groups;
the acrylate hard monomer is further defined as methyl methacrylate;
The acrylic ester soft monomer is selected from one or more of methyl acrylate, butyl acrylate and n-octyl acrylate.
Preferably, the unsaturated silane is selected from one or more of gamma-methacryloxypropyl trimethoxysilane or vinyl trimethoxysilane;
The nonionic emulsifier is selected from alkylphenol ethoxylates of NP series, further defined as NP-10 to NP-20;
the anionic emulsifier is one or more selected from sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and disodium sulfosuccinate monoester.
Preferably, the initiator is persulfate, further defined as one or more of ammonium persulfate, potassium persulfate and sodium persulfate;
the pH regulator is selected from one or more of ammonia water, sodium bicarbonate or sodium carbonate;
the protective colloid is polyvinyl alcohol 1788.
A method for preparing an aqueous hyperbranched polyacrylate modifier emulsion, which is used for preparing the aqueous hyperbranched polyacrylate modifier emulsion, and comprises the following steps:
s1, preparing hyperbranched prepolymer:
Dissolving diethylenetriamine in methanol, adding the methanol into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, stirring, heating to 65 ℃ under the protection of nitrogen, starting to dropwise add ethylene glycol diglycidyl ether, keeping the temperature for stirring for 2-4 hours after the dropwise addition is finished, and then removing the methanol in a rotary evaporator under reduced pressure to prepare a hyperbranched prepolymer;
S2, preparing seed emulsion:
Adding 1/3 of acrylate hard monomer, 1/3 of acrylate soft monomer, 1/3 of glycidyl acrylate, 1/3 of initiator, all pH regulator, nonionic emulsifier, anionic emulsifier, protective colloid and deionized water into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, uniformly stirring, heating to 55-65 ℃ and reacting until blue light appears, thus obtaining seed emulsion;
s3, preparing aqueous acrylic ester emulsion:
Uniformly mixing the rest hard acrylate monomer, soft acrylate monomer and glycidyl acrylate, respectively and simultaneously dripping the mixture and the rest initiator into seed emulsion at 55-65 ℃, when the residual volume of the dripping liquid is about 1/3, adding all unsaturated silane into the rest liquid, continuously dripping, finishing dripping all liquid within 1 hour, keeping the stirring speed, heating to 80-85 ℃ for 2-4 hours, cooling to room temperature, and filtering by gauze to obtain the water-based acrylate emulsion;
s4, preparing an aqueous hyperbranched polyacrylate modifier emulsion:
And mixing the hyperbranched prepolymer with the aqueous acrylic ester emulsion, and stirring and reacting for 0.5-1 hour at 40-50 ℃ to obtain the aqueous hyperbranched polyacrylate modifier emulsion.
Preferably, in S1, the molar ratio of diethylenetriamine to ethylene glycol diglycidyl ether monomer is 1:1.5-3;
the working parameters of the stirring are as follows: the stirring speed is 180-240r/min;
S2, the anionic surfactant and the nonionic surfactant are required to be prepared into an aqueous solution with the mass fraction of 20% in advance, and can be prepared into a mixed solution; the protective colloid is required to be prepared into an aqueous solution with the mass fraction of 8 percent in advance; the initiator needs to be prepared into an aqueous solution with the mass fraction of 10% in advance;
the working parameters of the stirring are as follows: the stirring speed is 180-240r/min.
Preferably, in S3, the working parameters of stirring are: the stirring speed is 200-300r/min;
The weight ratio of the hyperbranched prepolymer to the aqueous acrylate emulsion is 1:10-20, wherein the working parameters of stirring are as follows: the stirring speed is 180-240r/min.
The application of the aqueous hyperbranched polyacrylate modifier emulsion prepared according to the aqueous hyperbranched polyacrylate modifier emulsion or the preparation method in the cracking prevention of the plate.
Preferably, the aqueous hyperbranched polyacrylate modifier emulsion is diluted into an emulsion with 25 to 35 percent of solid content by water, and a defoaming agent and a thickening agent are added;
The defoaming agent is an organic silicon defoaming agent, and the mass fraction of the defoaming agent is 0.1-0.5% of the diluted emulsion;
The thickener is macromolecule modified hydroxymethyl cellulose thickener; the mass fraction of the thickener is 1-3% of the diluted emulsion.
Preferably, the method specifically comprises the following steps:
Coating the prepared aqueous hyperbranched polyurethane emulsion modifier on the surface of a veneer type artificial board such as a plywood by adopting equipment such as an anilox roller, a silk rod, a rubber roller and the like, wherein the wet coating weight is 10-40g/m 2, drying by blowing until the surface is not sticky, and repeating the steps for 1-4 times to obtain the aqueous hyperbranched polyacrylate emulsion modified board;
And hot-pressing the impregnated bond paper to the surface of the water-based hyperbranched polyacrylate emulsion modified plate, thus obtaining the anti-cracking impregnated bond paper veneer.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention uses the reaction of the triamine and the binary glycidyl ether to form the water-based hyperbranched prepolymer with the amino at the tail end, then reacts with the polyacrylate emulsion with the epoxy functional group at the side chain, and grafts on the polyacrylate to form the water-based hyperbranched polyacrylate emulsion. And the hyperbranched polyacrylate is grafted to the surface of the board through silane coupling, so that the modified plywood and the joinery board are prepared, and the hydrophobicity, the dimensional stability and the flatness of the surface of the board are improved. The impregnated bond paper is faced on the surfaces of the plywood and the joinery board through the hot pressing action, and the terminal amino groups of the hyperbranched polymer are further penetrated between the impregnated bond paper layers to react with free formaldehyde, so that a firm physicochemical action is formed, the interface binding force is enhanced, and the impregnated bond paper is prevented from cracking;
2. the water-based hyperbranched polyacrylate modifier emulsion prepared by the invention can also be applied to wood impregnation modification treatment;
3. the water-based hyperbranched polyacrylate modifier emulsion prepared by the invention can also be compounded with wood modifiers such as paraffin waterproof agents, CCA wood preservatives and the like.
Drawings
FIG. 1 is a flow chart of a preparation process of the aqueous hyperbranched polyacrylate modifier emulsion of the invention;
FIG. 2 is a schematic diagram of a crack resistant test specimen of the impregnated bond paper faced plywood of example 1 of the invention;
FIG. 3 is a schematic diagram of a crack resistant test specimen of the impregnated bond paper faced plywood of example 2 of the invention;
FIG. 4 is a schematic diagram of a crack resistant test specimen of the impregnated bond paper faced plywood of example 3 of the invention;
FIG. 5 is a schematic illustration of a crack resistant test specimen of impregnated bond paper faced plywood of example 4 of the invention;
Fig. 6 is a schematic representation of a crack resistant test specimen of the impregnated bond paper faced plywood of comparative example 1 of the invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which it is shown, however, to illustrate some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, the present invention provides a technical solution:
Example 1:
the preparation method of the water-based hyperbranched polyacrylate modifier emulsion comprises the following steps:
s1, preparing hyperbranched prepolymer:
10g of diethylenetriamine was dissolved in 10g of methanol, and the solution was stirred in a three-necked flask equipped with a stirrer, a thermometer and a condenser. Heating to 65 ℃ under the protection of nitrogen, starting to dropwise add 26g of ethylene glycol diglycidyl ether, keeping the temperature for stirring for 2 hours after the dropwise adding is finished, wherein the stirring speed is 180r/min, and then removing methanol in a rotary evaporator under reduced pressure to obtain the hyperbranched prepolymer;
S2, preparing seed emulsion:
0.5g of potassium persulfate is prepared into a 10% aqueous solution in advance, 2g of polyvinyl alcohol 1788 is prepared into an 8% aqueous solution in mass fraction, and 5g of NP-10 and 10g of sodium dodecyl benzene sulfonate are mixed to prepare a 20% aqueous surfactant solution in mass fraction. Adding 12g of methyl methacrylate, 19g of butyl acrylate, 2g of glycidyl acrylate, 0.5g of ammonia water, 1/3 of an initiator aqueous solution, all of a surfactant aqueous solution and a polyvinyl alcohol 1788 aqueous solution, adding 110g of water into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, uniformly stirring, heating to 55 ℃ and reacting until blue light appears to obtain seed emulsion;
s3, preparing aqueous acrylic ester emulsion:
24g of methyl methacrylate, 38g of butyl acrylate and 4g of glycidyl acrylate are uniformly mixed with the rest 2/3 of the initiator aqueous solution, and are respectively added into the seed emulsion in a dropwise manner at the temperature of 55 ℃ at the same time, and the stirring speed is increased to 200r/min. When the residual volume of the mixed methyl methacrylate, butyl acrylate and glycidyl acrylate is 1/3, 5g KH570 silane is added into the mixed liquid, the mixed liquid is continuously dripped at 55 ℃ until all the liquid is dripped in 1 hour, the stirring speed is maintained, the temperature is raised to 80 ℃ for 4 hours, the reaction is cooled to room temperature, and the water-based acrylic ester emulsion with the solid content of 38.2% is obtained after filtering by gauze;
s4, preparing an aqueous hyperbranched polyacrylate modifier emulsion:
10g of hyperbranched prepolymer and 100g of aqueous acrylic ester emulsion are mixed and stirred at 40 ℃ for reaction for 0.5 hour, and the stirring speed is 240r/min, so that the aqueous hyperbranched polyacrylate modifier emulsion can be obtained.
The invention also provides an application method of the water-based hyperbranched polyacrylate modifier emulsion in the cracking prevention of the plate, which comprises the following steps:
s5, surface modification of plywood
S501, modifying the aqueous hyperbranched polyacrylate modifier emulsion:
the aqueous hyperbranched polyurethane emulsion modifier is prepared into emulsion with 35% of solid content by water, and LAB-65A defoamer with the mass fraction of 0.1% and C-1 thickener with the mass fraction of 1wt% are added.
S502, preparing a waterborne hyperbranched polyurethane emulsion modified plywood:
The formulated aqueous hyperbranched polyurethane emulsion modifier was applied to the plywood surface using an anilox roll, wet applied at 10g/m 2, and then dried by air blast until the surface was tack free. Repeating the steps for 2 times to obtain the water-based hyperbranched polyurethane emulsion modified plywood.
S503 preparation of anti-cracking impregnated bond paper veneer plywood
And hot-pressing the impregnated bond paper on the plywood for 8min at the temperature of 160 ℃ under the pressure of 0.4Mpa, thus obtaining the anti-cracking impregnated bond paper veneer plywood.
Example 2:
the preparation method of the water-based hyperbranched polyacrylate modifier emulsion comprises the following steps:
s1, preparing hyperbranched prepolymer:
10g of diethylenetriamine was dissolved in 20g of methanol, and the solution was stirred in a three-necked flask equipped with a stirrer, a thermometer and a condenser. Dropwise adding 52g of ethylene glycol diglycidyl ether after the dropwise adding is finished after the temperature is raised to 65 ℃ under the protection of nitrogen, stirring for 4 hours at the stirring speed of 240r/min, and then removing methanol in a rotary evaporator under reduced pressure to obtain the hyperbranched prepolymer;
S2, preparing seed emulsion:
1g of potassium persulfate is prepared into a 10% aqueous solution in advance, 4g of polyvinyl alcohol 1788 is prepared into an 8% aqueous solution by mass fraction, and 10g of NP-20 and 14g of sodium dodecyl sulfate are mixed to prepare a 20% aqueous surfactant solution by mass fraction. 15g of methyl methacrylate, 22g of n-octyl acrylate, 4g of glycidyl acrylate, 2g of sodium bicarbonate, 1/3 of an aqueous solution of an initiator, all of an aqueous solution of a surfactant and an aqueous solution of polyvinyl alcohol 1788, 130g of water are added into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, uniformly stirred at a stirring speed of 240r/min, and heated to 65 ℃ for reaction until blue light appears to obtain seed emulsion;
s3, preparing aqueous acrylic ester emulsion:
30g of methyl methacrylate, 44g of n-octyl acrylate and 8g of glycidyl acrylate are uniformly mixed with the rest 2/3 of the initiator aqueous solution, and are respectively added into the seed emulsion in a dropwise manner at the temperature of 65 ℃ at the same time, and the stirring speed is increased to 300r/min. When the residual volume of the mixed methyl methacrylate, n-octyl acrylate and glycidyl acrylate is 1/3, 8g KH151 silane is added into the mixed liquid, the mixed liquid is continuously dripped at 65 ℃ until all the liquid is dripped in 1 hour, the stirring speed is maintained, the temperature is raised to 85 ℃ for 2 hours, the reaction is carried out, the cooled reaction is carried out to room temperature, and the water-based acrylic ester emulsion with the solid content of 36.6% is obtained after filtering by gauze;
s4, preparing an aqueous hyperbranched polyacrylate modifier emulsion:
Mixing 5g of hyperbranched prepolymer with 200g of aqueous acrylic ester emulsion, stirring and reacting for 1 hour at 40 ℃, wherein the stirring speed is 240r/min, and obtaining the aqueous hyperbranched polyacrylate modifier emulsion.
The invention also provides an application method of the water-based hyperbranched polyacrylate modifier emulsion in the cracking prevention of the plate, which comprises the following steps:
s5, surface modification of plywood
S501, modifying the aqueous hyperbranched polyacrylate modifier emulsion:
The aqueous hyperbranched polyurethane emulsion modifier is prepared into emulsion with 25 percent of solid content by water, and LAB-65A defoamer with the mass fraction of 0.2 percent and C-1 thickener with the mass fraction of 3 percent are added.
S502, preparing a waterborne hyperbranched polyurethane emulsion modified plywood:
The prepared aqueous hyperbranched polyurethane emulsion modifier is coated on the glued surface by a silk rod, and the wet coating weight is 20g/m 2. And then dried by air blast until the surface is tack free. Repeating the steps for 3 times to obtain the water-based hyperbranched polyurethane emulsion modified plywood.
S503 preparation of anti-cracking impregnated bond paper veneer plywood
And hot-pressing the impregnated bond paper on the plywood for 8min at the temperature of 160 ℃ under the pressure of 0.4Mpa, thus obtaining the anti-cracking impregnated bond paper veneer plywood.
Example 3:
the preparation method of the water-based hyperbranched polyacrylate modifier emulsion comprises the following steps:
s1, preparing hyperbranched prepolymer:
10g of diethylenetriamine was dissolved in 15g of methanol, and the mixture was stirred in a three-necked flask equipped with a stirrer, a thermometer and a condenser. Heating to 65 ℃ under the protection of nitrogen, starting to dropwise add 35g of ethylene glycol diglycidyl ether, keeping the temperature for stirring for 3 hours after the dropwise adding is finished, wherein the stirring speed is 200r/min, and then removing methanol in a rotary evaporator under reduced pressure to obtain the hyperbranched prepolymer;
S2, preparing seed emulsion:
0.8g of sodium persulfate is prepared into a 10% aqueous solution in advance, 3g of polyvinyl alcohol 1788 is prepared into an 8% aqueous solution in mass fraction, and 8g of NP-15 and 10g of disodium sulfosuccinate monoester are mixed to prepare a 20% aqueous surfactant solution in mass fraction. 13g of methyl methacrylate, 13g of methyl acrylate, 7g of n-butyl acrylate, 3g of glycidyl acrylate, 1g of sodium bicarbonate, 1/3 of aqueous solution of an initiator, all aqueous solution of a surfactant and aqueous solution of polyvinyl alcohol 1788, 120g of water are added into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, uniformly stirred at a stirring speed of 200r/min, and heated to 60 ℃ to react until blue light appears, so as to obtain seed emulsion;
s3, preparing aqueous acrylic ester emulsion:
26g of methyl methacrylate, 26g of methyl acrylate, 14g of n-octyl acrylate and 6g of glycidyl acrylate are uniformly mixed and are respectively added into the seed emulsion at 60 ℃ in a dropwise manner at the same time with the rest 2/3 of the initiator aqueous solution, and the stirring speed is increased to 240r/min. When the residual volume of the mixed methyl methacrylate, methyl acrylate, n-octyl acrylate and glycidyl acrylate is 1/3, 6g KH570 silane is added into the mixed liquid, the temperature is kept at 60 ℃ and the residual mixed liquid is continuously dripped, so that all the liquid is dripped in 1 hour, the stirring speed is kept, the temperature is raised to 81 ℃ for 3 hours, the reaction is carried out, the temperature is cooled to room temperature, and the water-based acrylic ester emulsion with the solid content of 36.8% is obtained after filtering by gauze;
s4, preparing an aqueous hyperbranched polyacrylate modifier emulsion:
mixing 5g of hyperbranched prepolymer with 150g of aqueous acrylic ester emulsion, stirring and reacting for 1 hour at 40 ℃, wherein the stirring speed is 200r/min, and obtaining the aqueous hyperbranched polyacrylate modifier emulsion.
The invention also provides an application method of the water-based hyperbranched polyacrylate modifier emulsion in the cracking prevention of the plate, which comprises the following steps:
s5, surface modification of plywood
S501, modifying the aqueous hyperbranched polyacrylate modifier emulsion:
The aqueous hyperbranched polyurethane emulsion modifier is prepared into emulsion with 30% of solid content by water, and LAB-65A defoamer with the mass fraction of 0.5% and C-1 thickener with the mass fraction of 2% are added.
S502, preparing a waterborne hyperbranched polyurethane emulsion modified plywood:
The prepared aqueous hyperbranched polyurethane emulsion modifier is coated on the surface of the plywood by a silk rod, and the wet coating weight is 40g/m 2. And then drying by blowing until the surface is not sticky, thus obtaining the waterborne hyperbranched polyurethane emulsion modified plywood.
S503 preparation of anti-cracking impregnated bond paper veneer plywood
And hot-pressing the impregnated bond paper on the plywood for 8min at the temperature of 160 ℃ under the pressure of 0.4Mpa, thus obtaining the anti-cracking impregnated bond paper veneer plywood.
Example 4:
the preparation method of the water-based hyperbranched polyacrylate modifier emulsion comprises the following steps:
s1, preparing hyperbranched prepolymer:
10g of diethylenetriamine was dissolved in 10g of methanol, and the solution was stirred in a three-necked flask equipped with a stirrer, a thermometer and a condenser. Heating to 60 ℃ under the protection of nitrogen, starting to dropwise add 31g of ethylene glycol diglycidyl ether, keeping the temperature for stirring for 2 hours after the dropwise adding is finished, wherein the stirring speed is 220r/min, and then removing methanol in a rotary evaporator under reduced pressure to obtain the hyperbranched prepolymer;
S2, preparing seed emulsion:
0.6g of sodium persulfate is prepared into a 10% aqueous solution in advance, 2g of polyvinyl alcohol 1788 is prepared into an 8% aqueous solution in mass fraction, and 6g of NP-12, 4g of sodium dodecylbenzenesulfonate and 8g of disodium sulfosuccinate monoester are mixed to prepare a 20% aqueous surfactant solution in mass fraction. 14g of methyl methacrylate, 10g of butyl acrylate, 11g of n-butyl acrylate, 3g of glycidyl acrylate, 1.5g of ammonia water, 1/3 of aqueous initiator solution, all aqueous surfactant solution and aqueous polyvinyl alcohol 1788 solution, and 110g of water are added into a three-neck flask with a stirring paddle, a thermometer and a condenser tube to be uniformly stirred, the stirring speed is 220r/min, and the temperature is raised to 60 ℃ to react until blue light appears, so as to obtain seed emulsion;
s3, preparing aqueous acrylic ester emulsion:
28g of methyl methacrylate, 20g of butyl acrylate, 22g of n-octyl acrylate and 6g of glycidyl acrylate are uniformly mixed and are respectively added into the seed emulsion at 60 ℃ in a dropwise manner at the same time with the rest 2/3 of the initiator aqueous solution, and the stirring speed is increased to 280r/min. When the residual volume of the mixed methyl methacrylate, butyl acrylate, n-octyl acrylate and glycidyl acrylate is 1/3, 7g KH570 silane is added into the mixed liquid, the temperature is kept at 60 ℃ and the residual mixed liquid is continuously added dropwise, so that all the liquid is completely added dropwise within 1 hour, the stirring speed is kept, the temperature is raised to 81 ℃ for 3 hours, the reaction is carried out, then the room temperature is cooled, and the water-based acrylic ester emulsion is obtained after filtering by gauze, wherein the solid content is 36.8%;
s4, preparing an aqueous hyperbranched polyacrylate modifier emulsion:
Mixing 5g of hyperbranched prepolymer with 120g of aqueous acrylic ester emulsion, stirring and reacting for 1.5 hours at 45 ℃, wherein the stirring speed is 220r/min, and obtaining the aqueous hyperbranched polyacrylate modifier emulsion.
The invention also provides an application method of the water-based hyperbranched polyacrylate modifier emulsion in the cracking prevention of the plate, which comprises the following steps:
S5, surface modification of joinery board
S501, modifying the aqueous hyperbranched polyacrylate modifier emulsion:
the aqueous hyperbranched polyurethane emulsion modifier is prepared into an emulsion with 28 percent of solid content by water, and LAB-65A defoamer with the mass fraction of 0.3 percent and C-1 thickener with the mass fraction of 1.5 percent are added.
S502, preparing a water-based hyperbranched polyurethane emulsion modified joinery board:
the prepared aqueous hyperbranched polyurethane emulsion modifier is coated on the surface of a joinery board by a rubber roller, and the wet coating weight is 30g/m 2. And then dried by air blast until the surface is tack free. Repeating the steps for 4 times to obtain the water-based hyperbranched polyurethane emulsion modified joinery board.
S503, preparation of anti-cracking impregnated film paper facing joinery board
And hot-pressing the impregnated bond paper on the joinery board for 8min at the temperature of 160 ℃ under the pressure of 0.4Mpa, thus obtaining the anti-cracking impregnated bond paper veneer joinery board.
Comparative example
Comparative example 1: comparative example 1 the hot press overlay of impregnated bond paper was carried out using only plywood without surface graft modification, the remaining conditions being the same as in example 1.
Performance testing
Examples 1 to 4 and comparative example 1 were tested for crack resistance, cold and heat cycle resistance and surface bond strength with reference to the national standard impregnated bond paper faced plywood and joinery panel (GB/T34722-2017), the results of which are shown in fig. 2 to 6 and table 1:
TABLE 1 crack resistance, cold and Heat cycle resistance and surface bond Strength of impregnated bond paper faced plywood or core board
The results show that: after the veneer plywood or the joinery board is subjected to the cracking resistance test, more than 10 cracks can be observed on the surface of the control example 1, the grade is 2, the cracking resistance of the examples 1-4 is obviously improved, no cracks are observed, and the grade reaches 5. After cold and hot resistance circulation, more than 3 penetrating cracks appear on the surface of the comparative example 1, the grade is 2, no cracks are observed on the surfaces of the experimental examples 1-4, and the grade reaches 5. In addition, the surface bonding strength of the plywood and the joinery board after the surface modification treatment is increased from 0.67MPa to 1.19-1.43MPa compared with that of comparative example 1, which shows that the interface bonding force between the surface of the test piece and the impregnated bond paper after the modification is improved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The water-based hyperbranched polyacrylate modifier emulsion is characterized by comprising the following components in parts by weight:
36-45 parts of acrylate hard monomer;
57-66 parts of acrylic ester soft monomer;
6-12 parts of glycidyl acrylate;
5-8 parts of unsaturated silane;
1-4 parts of diethylenetriamine;
3-15 parts of ethylene glycol diglycidyl ether;
1-6 parts of methanol;
5-10 parts of nonionic emulsifier;
6-14 parts of anionic emulsifier;
0.5-1 part of initiator;
0.5-2 parts of pH regulator;
2-4 parts of protective colloid;
110-130 parts of deionized water;
the acrylic hard monomer and the acrylic soft monomer do not contain benzene ring, hydroxyl, carboxyl and cyano functional groups;
the acrylate hard monomer is further defined as methyl methacrylate;
The acrylic ester soft monomer is selected from one or more of methyl acrylate, butyl acrylate and n-octyl acrylate.
2. The aqueous hyperbranched polyacrylate modifier emulsion according to claim 1, wherein the unsaturated silane is selected from one or more of gamma-methacryloxypropyl trimethoxysilane or vinyl trimethoxysilane;
the nonionic emulsifier is selected from alkylphenol ethoxylates of NP series;
the anionic emulsifier is one or more selected from sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and disodium sulfosuccinate monoester.
3. The aqueous hyperbranched polyacrylate modifier emulsion of claim 2, wherein the initiator is persulfate;
the pH regulator is selected from one or more of ammonia water, sodium bicarbonate or sodium carbonate;
the protective colloid is polyvinyl alcohol 1788.
4. An aqueous hyperbranched polyacrylate modifier emulsion according to claim 3 wherein the alkylphenol ethoxylates of the NP series are NP-10 to NP-20;
The persulfate is one or more of ammonium persulfate, potassium persulfate and sodium persulfate.
5. A method for preparing an aqueous hyperbranched polyacrylate modifier emulsion, which is used for preparing the aqueous hyperbranched polyacrylate modifier emulsion according to any one of claims 1 to 4, and is characterized by comprising the following steps:
s1, preparing hyperbranched prepolymer:
Dissolving diethylenetriamine in methanol, adding the methanol into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, stirring, heating to 65 ℃ under the protection of nitrogen, starting to dropwise add ethylene glycol diglycidyl ether, keeping the temperature for stirring for 2-4 hours after the dropwise addition is finished, and then removing the methanol in a rotary evaporator under reduced pressure to prepare a hyperbranched prepolymer;
S2, preparing seed emulsion:
Adding 1/3 of acrylate hard monomer, 1/3 of acrylate soft monomer, 1/3 of glycidyl acrylate, 1/3 of initiator, all pH regulator, nonionic emulsifier, anionic emulsifier, protective colloid and deionized water into a three-neck flask with a stirring paddle, a thermometer and a condenser tube, uniformly stirring, heating to 55-65 ℃ and reacting until blue light appears, thus obtaining seed emulsion;
s3, preparing aqueous acrylic ester emulsion:
Uniformly mixing the rest hard acrylate monomer, soft acrylate monomer and glycidyl acrylate, respectively and simultaneously dripping the mixture and the rest initiator into seed emulsion at 55-65 ℃, when the residual volume of the dripping liquid is about 1/3, adding all unsaturated silane into the rest liquid, continuously dripping, finishing dripping all liquid within 1 hour, keeping the stirring speed, heating to 80-85 ℃ for 2-4 hours, cooling to room temperature, and filtering by gauze to obtain the water-based acrylate emulsion;
s4, preparing an aqueous hyperbranched polyacrylate modifier emulsion:
And mixing the hyperbranched prepolymer with the aqueous acrylic ester emulsion, and stirring and reacting for 0.5-1 hour at 40-50 ℃ to obtain the aqueous hyperbranched polyacrylate modifier emulsion.
6. The method for preparing the aqueous hyperbranched polyacrylate modifier emulsion according to claim 5, wherein in S1, the molar ratio of diethylenetriamine to ethylene glycol diglycidyl ether monomer is 1:1.5-3;
the working parameters of the stirring are as follows: the stirring speed is 180-240r/min;
S2, the anionic surfactant and the nonionic surfactant are required to be prepared into an aqueous solution with the mass fraction of 20% in advance, and can be prepared into a mixed solution; the protective colloid is required to be prepared into an aqueous solution with the mass fraction of 8 percent in advance; the initiator needs to be prepared into an aqueous solution with the mass fraction of 10% in advance;
the working parameters of the stirring are as follows: the stirring speed is 180-240r/min.
7. The method for preparing an aqueous hyperbranched polyacrylate modifier emulsion according to claim 5, wherein in S3, the working parameters of stirring are: the stirring speed is 200-300r/min;
The weight ratio of the hyperbranched prepolymer to the aqueous acrylate emulsion is 1:10-20, wherein the working parameters of stirring are as follows: the stirring speed is 180-240r/min.
8. Use of an aqueous hyperbranched polyacrylate modifier emulsion according to any one of claims 1 to 4 or prepared by a preparation method according to any one of claims 5 to 7 for crack prevention of a sheet.
9. The use of an aqueous hyperbranched polyacrylate modifier emulsion in the prevention of cracking of a board according to claim 8, characterized in that the aqueous hyperbranched polyacrylate modifier emulsion is diluted with water to an emulsion with 25-35% solids content, and defoamer and thickener are added;
The defoaming agent is an organic silicon defoaming agent, and the mass fraction of the defoaming agent is 0.1-0.5% of the diluted emulsion;
The thickener is macromolecule modified hydroxymethyl cellulose thickener; the mass fraction of the thickener is 1-3% of the diluted emulsion.
10. The use of an aqueous hyperbranched polyacrylate modifier emulsion according to claim 8 for crack protection of boards, comprising the specific steps of:
Coating the prepared aqueous hyperbranched polyurethane emulsion modifier on the surface of a veneer type artificial board such as a plywood by adopting equipment such as an anilox roller, a silk rod, a rubber roller and the like, wherein the wet coating weight is 10-40g/m 2, drying by blowing until the surface is not sticky, and repeating the steps for 1-4 times to obtain the aqueous hyperbranched polyacrylate emulsion modified board;
And hot-pressing the impregnated bond paper to the surface of the water-based hyperbranched polyacrylate emulsion modified plate, thus obtaining the anti-cracking impregnated bond paper veneer.
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