CN110373938B - Water-resistant paper-plastic composite material and preparation method thereof - Google Patents
Water-resistant paper-plastic composite material and preparation method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 229920003023 plastic Polymers 0.000 title claims abstract description 42
- 239000004033 plastic Substances 0.000 title claims abstract description 42
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 11
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 11
- 229920001690 polydopamine Polymers 0.000 claims abstract description 6
- 239000000123 paper Substances 0.000 claims description 79
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 36
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 27
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 22
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 21
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 18
- 239000002655 kraft paper Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 14
- 239000011259 mixed solution Substances 0.000 claims description 12
- 229960003638 dopamine Drugs 0.000 claims description 11
- YOCIJWAHRAJQFT-UHFFFAOYSA-N 2-bromo-2-methylpropanoyl bromide Chemical compound CC(C)(Br)C(Br)=O YOCIJWAHRAJQFT-UHFFFAOYSA-N 0.000 claims description 10
- 229910021589 Copper(I) bromide Inorganic materials 0.000 claims description 10
- NKNDPYCGAZPOFS-UHFFFAOYSA-M copper(i) bromide Chemical compound Br[Cu] NKNDPYCGAZPOFS-UHFFFAOYSA-M 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- UKODFQOELJFMII-UHFFFAOYSA-N pentamethyldiethylenetriamine Chemical compound CN(C)CCN(C)CCN(C)C UKODFQOELJFMII-UHFFFAOYSA-N 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 239000011111 cardboard Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims 1
- FYFFGSSZFBZTAH-UHFFFAOYSA-N methylaminomethanetriol Chemical compound CNC(O)(O)O FYFFGSSZFBZTAH-UHFFFAOYSA-N 0.000 claims 1
- DEQXHPXOGUSHDX-UHFFFAOYSA-N methylaminomethanetriol;hydrochloride Chemical compound Cl.CNC(O)(O)O DEQXHPXOGUSHDX-UHFFFAOYSA-N 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 239000000945 filler Substances 0.000 abstract description 8
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 13
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical group OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000010560 atom transfer radical polymerization reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- -1 lignocellulose Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000002982 water resistant material Substances 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- GUBGYTABKSRVRQ-XLOQQCSPSA-N Alpha-Lactose Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@H](O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-XLOQQCSPSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- GUBGYTABKSRVRQ-QKKXKWKRSA-N Lactose Natural products OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)C(O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O GUBGYTABKSRVRQ-QKKXKWKRSA-N 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- FBSAITBEAPNWJG-UHFFFAOYSA-N dimethyl phthalate Natural products CC(=O)OC1=CC=CC=C1OC(C)=O FBSAITBEAPNWJG-UHFFFAOYSA-N 0.000 description 1
- 229960001826 dimethylphthalate Drugs 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000008101 lactose Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a water-resistant paper-plastic composite material which comprises a paper material and a plastic filler, wherein the plastic filler is arranged in the paper material, and comprises polydopamine and polymethyl methacrylate. The invention also provides a preparation method of the water-resistant paper-plastic composite material, wherein the water-resistant component polymethyl methacrylate in the water-resistant paper-plastic composite material is connected with polydopamine attached to paper fibers through covalent bonds and filled among paper material fiber pores, and the water-resistant component polymethyl methacrylate has good compatibility with paper. The method for preparing the water-resistant paper-plastic composite material has simple steps and is easy to carry out large-scale production.
Description
Technical Field
The invention relates to the field of papermaking, in particular to a water-resistant paper-plastic composite material and a preparation method thereof.
Background
The paper is used as a convenient writing, printing, packaging and decorating material and is widely applied to daily life of people. Traditional paper can soften even dissolve after meeting water, seriously influences its performance.
Imparting water resistance to paper is a hot spot in the papermaking art. The traditional water-resistant paper is usually made by adhering a composite film on the surface of the paper and performing surface coating. For the composite film method, a water-resistant material is compounded on a paper material so as to achieve the water-resistant effect. The method has good water resistance, but once water enters the paper material from the seam, the water resistance function is lost. The surface coating is to cover a layer of water-resistant surface layer on the surface of a common paper material by walking equipment, the method has simple process, but the obtained water-resistant performance of the paper material is limited, the hydrophobicity is not strong, and the water-resistant performance is unstable due to the uniform coating degree and thickness, so the requirement of the water-resistant paper material is difficult to meet.
Patent document CN108867196A discloses an environment-friendly waterproof paper and a preparation method thereof, the waterproof paper is prepared from straw, withered leaves, columns, modified acrylic resin, magnesium oxide particles, pectin, polyester fiber, starch, dilute sulfuric acid, glycerol, lignocellulose, surfactant, auxiliary agent, polyvinyl alcohol and the like as raw materials by processes of blending, pulping, compression molding, drying and the like. The waterproof paper prepared by the method is environment-friendly and has certain water resistance. However, the raw materials are complex, the process is complicated, and the compatibility of the water-resistant component and the paper material is poor, so that the long-term stable water-resistant performance cannot be ensured.
Patent document CN104790256B discloses a method for producing highly water-resistant paper, which uses polyvinyl alcohol as a waterproof material, and performs water-resistant treatment on paper by gluing and surface gluing processes, thereby obtaining highly water-resistant paper. The water-resistant paper obtained by the method has better water resistance, but the polyvinyl alcohol water-resistant glue solution and the paper material are only combined by physical acting force, once the combination between the polyvinyl alcohol water-resistant glue solution and the paper material is damaged, the water resistance effect is greatly reduced, and the long-time reutilization is difficult to realize.
Patent document CN104925355B discloses a waterproof paper-plastic composite bag and a preparation method thereof, wherein the plastic layer is prepared by coating a plastic layer on the surface of a paper layer by heating, using starch, polyvinyl alcohol, poly-beta-hydroxyacetate, modified polyacrylate, high-density polyethylene, dicumyl peroxide, polyisobutylene, polyester fiber, lactose, glycerol, dimethyl phthalate and epoxy resin as raw materials. The composite paper has simple preparation process and good waterproof performance, but the raw materials are complex, the compatibility of the plastic layer and the paper material needs to be improved, and the good waterproof performance is difficult to maintain for a long time.
Therefore, there is still a need in the art for a technique to further improve the compatibility of water resistant materials with paper materials.
Disclosure of Invention
The invention aims to provide a water-resistant paper-plastic composite material and a preparation method thereof, the water-resistant paper-plastic composite material has excellent water resistance, hydrophobic polymers are introduced to the surface of paper fibers in a covalent bond mode, the compatibility is good, the preparation method is simple, and the large-scale production is easy.
In order to achieve the purpose, the invention provides a water-resistant paper-plastic composite material which comprises a paper material and a plastic filler, wherein the plastic filler is arranged in the paper material.
Wherein the plastic filler comprises polydopamine and polymethyl methacrylate.
The invention also provides a preparation method of the water-resistant paper-plastic composite material, which comprises the following steps:
(1) fully soaking a paper material in a dopamine/tris (hydroxymethyl) aminomethane hydrochloride mixed aqueous solution (pH 8.5), and then washing and drying by deionized water;
(2) and fully soaking the obtained paper material in a tetrahydrofuran/triethylamine mixed solution, and then adding 2-bromoisobutyryl bromide. Washing with methanol/water solution after the reaction is finished, and drying under reduced pressure;
(3) and fully soaking the obtained paper material in a tetrahydrofuran/pentamethyldiethylenetriamine/methyl methacrylate mixed solution, directly adding cuprous bromide into the system, and fully mixing. And after the reaction is finished, washing with methanol/water solution, and drying under reduced pressure to obtain the water-resistant paper-plastic composite material.
In the above method, the contents of the respective components may be selected within wide ranges from the viewpoint of improving water resistance, wherein the dopamine in the step (1) is added in an amount of 1 to 2 parts by weight, the tris hydrochloride is added in an amount of 1 to 2 parts by weight, and the water is added in an amount of 500-600 parts by weight, relative to 100 parts by weight of the paper material. In the step (2), the adding amount of the tetrahydrofuran is 500-600 parts by weight, the adding amount of the triethylamine is 20-30 parts by weight, and the adding amount of the 2-bromoisobutyryl bromide is 20-30 parts by weight. In the step (3), the adding amount of the tetrahydrofuran is 500-600 parts by weight, the adding amount of the pentamethyl diethylenetriamine is 20-30 parts by weight, the adding amount of the methyl methacrylate is 20-40 parts by weight, and the adding amount of the cuprous bromide is 20-30 parts by weight.
In the above method, the reaction time of each step may be selected within a wide range, and the reaction time in the step (2) is preferably 2 to 3 hours from the viewpoint of improving water resistance. The reaction time in the step (3) is preferably 3 to 6 hours, and the amount of methyl methacrylate added is preferably 30 parts by weight.
In the above method, the reaction temperature in each step is room temperature (about 25 ℃).
The invention has the beneficial effects that:
the water-resistant component polymethyl methacrylate in the water-resistant paper-plastic composite material prepared by the invention is connected with polydopamine attached to paper fibers through covalent bonds and filled in pores of the paper material fibers, and the water-resistant component polymethyl methacrylate has good compatibility with paper. In addition, the method for preparing the water-resistant paper-plastic composite material provided by the invention has simple steps and is easy to carry out large-scale production.
The dopamine used by the invention can be deposited on the surface of paper fiber, and is polymerized under the alkalescent condition to wrap the paper fiber and expose the catechol structure, and abundant active hydroxyl groups can provide reaction sites for initiating grafting.
The grafting method adopted by the invention is an Atom Transfer Radical Polymerization (ATRP) method, and bromoalkane (2-bromoisobutyryl bromide) is introduced into an active hydroxyl site (dopamine catechol structure). The paper-based material is used as an initiator, and a transition metal complex (cuprous bromide) is used as a bromine atom carrier, so that the methyl methacrylate is grafted and copolymerized on the surface of the paper fiber. The method has the advantages of almost no homopolymer byproduct, controllable reaction, mild condition and low cost.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a water-resistant paper-plastic composite material which comprises a paper material and a plastic filler, wherein the plastic filler is arranged in the paper material. Wherein the plastic filler comprises polydopamine and polymethyl methacrylate.
In the present invention, the weight average molecular weight of polymethyl methacrylate may be selected within a wide range, and it is preferable that the weight average molecular weight of polymethyl methacrylate is 2000-3000 in view of improving water resistance.
In the present invention, the paper material may be selected from a wide range, and is one of paper bag paper, kraft paper, leatherboard paper, striped kraft paper, liner paper, cardboard paper, corrugated paper, and honeycomb board.
The invention also provides a preparation method of the water-resistant paper-plastic composite material, which is characterized by comprising the following steps:
(1) fully soaking a paper material in a dopamine/tris (hydroxymethyl) aminomethane hydrochloride mixed aqueous solution (pH 8.5), and then washing and drying by deionized water;
(2) and fully soaking the obtained paper material in a tetrahydrofuran/triethylamine mixed solution, and then adding 2-bromoisobutyryl bromide. Washing with methanol/water solution after the reaction is finished, and drying under reduced pressure;
(3) and fully soaking the obtained paper material in a tetrahydrofuran/pentamethyldiethylenetriamine/methyl methacrylate mixed solution, and then adding cuprous bromide and fully mixing. And after the reaction is finished, washing with methanol/water solution, and drying under reduced pressure to obtain the water-resistant paper-plastic composite material.
In the present invention, the paper material may be selected from a wide range, and is one of paper bag paper, kraft paper, leatherboard paper, striped kraft paper, liner paper, cardboard paper, corrugated paper, honeycomb board, and the like.
In the above method, the contents of the respective components may be selected within wide ranges from the viewpoint of improving water resistance, wherein the dopamine in the step (1) is added in an amount of 1 to 2 parts by weight, the tris hydrochloride is added in an amount of 1 to 2 parts by weight, and the water is added in an amount of 500-600 parts by weight, relative to 100 parts by weight of the paper material. In the step (2), the adding amount of the tetrahydrofuran is 500-600 parts by weight, the adding amount of the triethylamine is 20-30 parts by weight, and the adding amount of the 2-bromoisobutyryl bromide is 20-30 parts by weight. In the step (3), the adding amount of the tetrahydrofuran is 500-600 parts by weight, the adding amount of the pentamethyl diethylenetriamine is 20-30 parts by weight, the adding amount of the methyl methacrylate amine is 20-40 parts by weight, and the adding amount of the cuprous bromide is 20-30 parts by weight.
In the above method, the reaction time of each step may be selected within a wide range, and the reaction time in the step (2) is preferably 2 to 3 hours from the viewpoint of improving water resistance. The reaction time in the step (3) is preferably 3 to 6 hours, and the amount of methyl methacrylate added is preferably 30 parts by weight.
In the above method, the reaction temperature in each step is room temperature (about 25 ℃).
Example 1
100 parts by weight of 150 g per square meter kraft paper is put into 500 parts dopamine (4 mg/mL)/tris hydrochloride (10mM) aqueous solution (pH 8.5) at 25 ℃, soaked thoroughly, washed with deionized water and dried. The obtained paper sample was immersed in a mixed solution of 500 parts of tetrahydrofuran and 25 parts of triethylamine, followed by addition of 25 parts of 2-bromoisobutyryl bromide, reaction for 2 hours, washing with a methanol/water (volume ratio, 1/1) solution, and drying under reduced pressure. Then, the mixture was again immersed in a mixed solution of 500 parts of tetrahydrofuran, 25 parts of pentamethyldiethylenetriamine and 20 parts of methyl methacrylate, and 4 parts of cuprous bromide was added thereto and mixed well. After 5 hours of reaction, washing the mixture by using methanol/water solution (the volume ratio is 1/1), and drying the mixture under reduced pressure to obtain the water-resistant paper-plastic composite material.
Example 2
100 parts by weight of 150 g per square meter kraft paper is put into 400 parts dopamine (4 mg/mL)/tris hydrochloride (10mM) aqueous solution (pH 8.5) at 25 ℃, soaked thoroughly, washed with deionized water and dried. The obtained paper sample was immersed in a mixed solution of 500 parts of tetrahydrofuran and 25 parts of triethylamine, followed by addition of 20 parts of 2-bromoisobutyryl bromide, reaction for 2 hours, washing with a methanol/water (volume ratio, 1/1) solution, and drying under reduced pressure. Then, the mixture was again immersed in a mixed solution of 500 parts of tetrahydrofuran, 25 parts of pentamethyldiethylenetriamine and 20 parts of methyl methacrylate, and 4 parts of cuprous bromide was added thereto and mixed well. After 5 hours of reaction, washing the mixture by using methanol/water solution (the volume ratio is 1/1), and drying the mixture under reduced pressure to obtain the water-resistant paper-plastic composite material.
Example 3
100 parts by weight of 150 g per square meter kraft paper is put into 500 parts dopamine (4 mg/mL)/tris hydrochloride (10mM) aqueous solution (pH 8.5) at 25 ℃, soaked thoroughly, washed with deionized water and dried. The obtained paper sample was immersed in a mixed solution of 500 parts of tetrahydrofuran and 25 parts of triethylamine, followed by addition of 25 parts of 2-bromoisobutyryl bromide, reaction for 2 hours, washing with a methanol/water (volume ratio, 1/1) solution, and drying under reduced pressure. Then, the mixture was again immersed in a mixed solution of 500 parts of tetrahydrofuran, 25 parts of pentamethyldiethylenetriamine and 5 parts of methyl methacrylate, and 4 parts of cuprous bromide was added thereto and mixed well. After reacting for 2 hours, washing with methanol/water solution (volume ratio 1/1), and drying under reduced pressure to obtain the water-resistant paper-plastic composite material.
Example 4
The amount of methyl methacrylate added was 25 parts (relative to 100 parts by weight of kraft paper stock) as different from that of the step (3) in example 1, except that all the same was used.
Example 5
The amount of methyl methacrylate added was 30 parts (relative to 100 parts by weight of kraft paper stock) as different from that of methyl methacrylate added in step (3) in example 1, all of which were the same.
Example 6
The amount of methyl methacrylate added was 35 parts (relative to 100 parts by weight of kraft paper stock) as different from that of methyl methacrylate added in step (3) in example 1, all of which were the same.
Example 7
Unlike the amount of methyl methacrylate added in step (3) in example 1, the amount of methyl methacrylate added was 40 parts (relative to 100 parts by weight of the kraft paper stock), all the same.
Comparative example kraft paper produced by a company of Tianjin was used as a comparative example.
The water-resistant paper-plastic composite material prepared by the invention and the kraft paper in the comparative example are detected, and the detection results are shown in table 1:
water resistance test
The relative water absorption was measured by the method specified in GB/T461.3-2005, "determination of Water absorption of paper and Board (Water immersion method)".
Measurement of physical and mechanical Properties
The tensile strength and elongation at break were measured by the methods specified in GB/T12914-1991 test for tensile strength of paper and paperboard (constant tensile method).
The burst index is tested by the method specified in GB/T454-2002 paper burst test.
TABLE 1 measurement results of Properties
As can be seen from the data in Table 1, the amount of methyl methacrylate added is an important indicator of the present invention. Examples 1-3 show that when the amount of the methyl methacrylate added is 20-40 parts by weight (relative to 100 parts by weight of kraft paper raw material), the paper-plastic composite material shows better water resistance and mechanical properties. Furthermore, the combination of the mechanical properties and water resistance results of the finished product shows that the most preferable embodiment of the present invention, example 5, is significantly superior to other examples and comparative examples, and according to the examples and comparative examples, the mechanical properties and water resistance of the prepared paper-plastic composite material are best when the amount of the added methyl methacrylate of step (3) is 40 parts by weight (relative to 100 parts by weight of kraft paper raw material).
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A kind of water-resistant paper-plastic composite material, this paper-plastic composite material includes paper material and plastic packing, characterized by that, the said plastic packing uses polydopamine and polymethyl methacrylate as the main material, through soaking, surface grafting method, make polymer packing and paper fiber pass the chemical bond connection, and locate in paper material, prepare the paper-plastic composite material with good water-resistant performance and water-resistant stability, the preparation step is as follows:
(1) fully soaking a paper material in a dopamine/trihydroxymethylaminomethane hydrochloride mixed aqueous solution, then washing and drying by using deionized water, wherein relative to 100 parts by weight of the paper material, the dopamine is added in an amount of 1-2 parts by weight, the trihydroxymethylaminomethane hydrochloride is added in an amount of 1-2 parts by weight, and the water is added in an amount of 500-;
(2) fully soaking the obtained paper material in a tetrahydrofuran/triethylamine mixed solution, then adding 2-bromo-isobutyryl bromide, reacting for 2-3 hours, washing with a methanol/water solution, and drying under reduced pressure; relative to 100 parts by weight of the paper material, the adding amount of tetrahydrofuran is 500-600 parts by weight, the adding amount of triethylamine is 20-30 parts by weight, and the adding amount of 2-bromoisobutyryl bromide is 20-30 parts by weight;
(3) fully soaking the obtained paper material in a tetrahydrofuran/pentamethyldiethylenetriamine/methyl methacrylate mixed solution, directly adding cuprous bromide into the system, fully mixing and reacting for 3-6 hours, washing with a methanol/water solution, and drying under reduced pressure to obtain the water-resistant paper-plastic composite material; relative to 100 parts by weight of the paper material, the adding amount of tetrahydrofuran is 500-600 parts by weight, the adding amount of pentamethyl diethylenetriamine is 20-30 parts by weight, the adding amount of methyl methacrylate is 20-40 parts by weight, and the adding amount of cuprous bromide is 20-30 parts by weight;
the molecular weight of the polymethyl methacrylate is 2 kDa-3 kDa.
2. The water-resistant paper-plastic composite material as claimed in claim 1, wherein the paper material is one of paper bag paper, kraft paper, leatheroid paper, striped kraft paper, liner paper, cardboard paper, corrugated paper, and honeycomb cardboard.
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