CN117144720B - White cardboard for packaging and preparation method and application thereof - Google Patents
White cardboard for packaging and preparation method and application thereof Download PDFInfo
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- CN117144720B CN117144720B CN202311009161.2A CN202311009161A CN117144720B CN 117144720 B CN117144720 B CN 117144720B CN 202311009161 A CN202311009161 A CN 202311009161A CN 117144720 B CN117144720 B CN 117144720B
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- sodium silicate
- white cardboard
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- 239000011111 cardboard Substances 0.000 title claims abstract description 77
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 250
- 239000011248 coating agent Substances 0.000 claims abstract description 247
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical class [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 78
- 239000000123 paper Substances 0.000 claims abstract description 56
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 47
- 239000000839 emulsion Substances 0.000 claims abstract description 43
- 239000002904 solvent Substances 0.000 claims abstract description 37
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 33
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 23
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 23
- 229920003180 amino resin Polymers 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 15
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 12
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims description 47
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 45
- 238000003756 stirring Methods 0.000 claims description 30
- LQZZUXJYWNFBMV-UHFFFAOYSA-N ethyl butylhexanol Natural products CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 4
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 20
- 239000001301 oxygen Substances 0.000 abstract description 20
- 229910052760 oxygen Inorganic materials 0.000 abstract description 20
- 239000003921 oil Substances 0.000 abstract description 18
- 235000013305 food Nutrition 0.000 abstract description 15
- 230000002265 prevention Effects 0.000 abstract description 14
- 235000019198 oils Nutrition 0.000 description 17
- 239000011247 coating layer Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 230000003405 preventing effect Effects 0.000 description 11
- AYLRODJJLADBOB-QMMMGPOBSA-N methyl (2s)-2,6-diisocyanatohexanoate Chemical group COC(=O)[C@@H](N=C=O)CCCCN=C=O AYLRODJJLADBOB-QMMMGPOBSA-N 0.000 description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 8
- 229910052708 sodium Inorganic materials 0.000 description 8
- 239000011734 sodium Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 description 5
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000005457 ice water Substances 0.000 description 5
- CZXGXYBOQYQXQD-UHFFFAOYSA-N methyl benzenesulfonate Chemical compound COS(=O)(=O)C1=CC=CC=C1 CZXGXYBOQYQXQD-UHFFFAOYSA-N 0.000 description 5
- 229960001124 trientine Drugs 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229940077388 benzenesulfonate Drugs 0.000 description 3
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 description 3
- 235000012424 soybean oil Nutrition 0.000 description 3
- 239000003549 soybean oil Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002939 oilproofing Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007858 starting material Substances 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Paper (AREA)
Abstract
The invention belongs to the technical field of packaging paper, and discloses a white cardboard for packaging and a preparation method and application thereof. The white cardboard sequentially comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top; the first coating and the third coating have the same composition and are prepared from a first coating, wherein the first coating comprises aqueous hydroxy acrylic resin emulsion, hydroxy polydimethylsiloxane, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent; the second coating and the fourth coating have the same composition and are prepared from a second coating, wherein the second coating comprises amino resin emulsion, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent; the modified sodium silicate is obtained by modifying nano sodium silicate by adopting a silane coupling agent, nano silicon dioxide, polyethylene glycol and water. The white cardboard can solve the problems of water vapor prevention, oxygen prevention and oil prevention simultaneously, has strong tolerance to high-temperature and low-temperature water-containing foods and is not easy to crack.
Description
Technical Field
The invention belongs to the technical field of packaging paper, and particularly relates to a white cardboard for packaging and a preparation method and application thereof.
Background
The packaging paper is of a wide variety, and the food packaging paper is a packaging paper with extremely large use amount. The food has special requirements on paper for food packaging due to the requirements of quality guarantee, fresh keeping and the like. For example, the packaging paper is required to have the characteristics of blocking oxygen, water vapor and oil, and is also required to have certain strength and not to be easily broken. Other fields may also have requirements for the wrapper to have oxygen, moisture, oil barrier.
In the prior art, the paper for food packaging is usually coated on white cardboard by polyethylene, and the polyethylene has better functions of preventing water vapor, oxygen and oil, but is difficult to degrade in nature and has poor environmental protection. Therefore, some coatings with the functions of preventing water vapor, oxygen and oil are gradually used for coating the white cardboard in the prior art. Although the method can solve the environmental protection problem, when the prepared paper is used for food packaging, the strength of the packaging paper is poor and the paper is easy to crack when the paper is used for high-temperature and low-temperature water-containing foods.
Therefore, there is a need to provide a new white cardboard for food packaging, which can solve the problems of water vapor prevention, oxygen prevention and oil prevention at the same time, has strong tolerance to high and low temperature water-containing foods and is not easy to crack.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the invention provides the white cardboard for packaging, and the preparation method and application thereof, and the white cardboard can simultaneously solve the problems of water vapor prevention, oxygen prevention and oil prevention, has strong tolerance to high-temperature and low-temperature water-containing foods and is not easy to crack.
The invention is characterized in that: the white cardboard comprises a paper base material and 4 coating layers positioned on the surface of the paper base material, wherein the first coating layer and the third coating layer have the same composition, and the second coating layer and the fourth coating layer have the same composition. The first coating for preparing the first coating comprises aqueous hydroxy acrylic resin emulsion, hydroxy polydimethylsiloxane, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent, wherein the auxiliary agent B is mixed with other components of the first coating when the first coating is prepared to form the first coating, the first coating is coated on the surface of a paper substrate, a space network structure is formed through the reaction of the aqueous hydroxy acrylic resin emulsion and the hydroxy polydimethylsiloxane, and the modified sodium silicate is uniformly dispersed in the formed space network structure. The modified sodium silicate is obtained by modifying nano sodium silicate by adopting a silane coupling agent, nano silicon dioxide, polyethylene glycol and water; the modified sodium silicate not only can be used as filler, but also can be uniformly filled in a space network structure formed by the reaction of the aqueous hydroxy acrylic resin emulsion and the hydroxy polydimethylsiloxane, thereby playing a good role in preventing water vapor, oxygen and oil. The second coating consists of amino resin emulsion, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent. In the preparation of the second coating, auxiliary B and the remaining components are mixed. The modified sodium silicate is uniformly dispersed in the second coating (in addition, because the modified sodium silicate is modified, the modified sodium silicate can be uniformly dispersed in the first coating and the second coating at the same time), so that the modified sodium silicate plays a good role in preventing water vapor, oxygen and oil. And on the surface of the paper substrate, through the alternate coordination of the first coating, the second coating, the third coating and the fourth coating, the water vapor, oxygen and oil preventing performance of the white cardboard can be obviously improved, and the white cardboard can also be improved to have strong tolerance to high-temperature and low-temperature water-containing foods and is not easy to crack.
In addition, citric acid is also introduced into the second coating, and due to the characteristics of polyhydroxy and carbon skeletons of the citric acid, amino resin emulsion is matched to react with the auxiliary agent B, a network skeleton with a structure different from that of the first coating can be formed, the dispersion of modified sodium silicate is more facilitated, and certain interaction is formed on the structure of the modified sodium silicate and the first coating, so that the water vapor prevention, oxygen prevention and oil prevention effects are better improved, and the high-temperature and low-temperature water-containing food tolerance capability is strong.
A first aspect of the present invention provides a white cardboard for packaging.
Specifically, a white cardboard for packaging sequentially comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top;
the first coating and the third coating have the same composition and are both prepared from a first coating, wherein the first coating comprises aqueous hydroxy acrylic resin emulsion, hydroxy polydimethylsiloxane, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent;
the second coating and the fourth coating have the same composition and are prepared from a second coating, wherein the second coating comprises amino resin emulsion, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent;
The modified sodium silicate is obtained by modifying nano sodium silicate by adopting a silane coupling agent, nano silicon dioxide, polyethylene glycol and water;
the auxiliary agent A comprises sodium methylene bis (methylbenzene) sulfonate, a defoaming agent and dodecanol ester;
The auxiliary B comprises isocyanate.
Preferably, the auxiliary A further comprises an antibacterial agent and an antioxidant. Is used for improving the antibacterial property and the oxidation resistance of the white cardboard.
Preferably, the auxiliary B further comprises triethylene tetramine.
Preferably, the defoamer is polydimethylsiloxane.
Preferably, the preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of (1-10): (3-15): (2-12): (30-80): (25-45) and preparing the modified sodium silicate.
Preferably, the preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of (4-10): (5-12): (3-12): (35-60): (30-40), wherein the temperature during mixing is 40-60 ℃, the stirring speed during mixing is 800-1200 rpm, and the mixing time is 2-5 hours, so as to obtain the modified sodium silicate.
Preferably, the silane coupling agent is selected from silane coupling agent KH560 or silane coupling agent KH570.
Preferably, the isocyanate is lysine diisocyanate.
Preferably, the solvent is water.
Preferably, the second coating further comprises citric acid.
Preferably, the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 20-40 parts of hydroxy polydimethylsiloxane, 60-80 parts of modified sodium silicate, 5-20 parts of auxiliary agent A, 4-12 parts of auxiliary agent B and 100-200 parts of solvent.
Further preferably, the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 25-30 parts of hydroxy polydimethylsiloxane, 65-70 parts of modified sodium silicate, 5-15 parts of an auxiliary agent A, 4-10 parts of an auxiliary agent B and 100-180 parts of a solvent.
Preferably, the second coating comprises, by weight, 80 parts of an amino resin emulsion, 40-55 parts of modified sodium silicate, 5-20 parts of an auxiliary agent A, 4-12 parts of an auxiliary agent B and 100-200 parts of a solvent.
Further preferably, the second coating comprises 80 parts of amino resin emulsion, 10-20 parts of citric acid, 40-50 parts of modified sodium silicate, 5-15 parts of auxiliary agent A, 4-10 parts of auxiliary agent B and 100-180 parts of solvent. The component amounts of the first coating and the second coating are reasonably selected, so that the water vapor, oxygen and oil preventing performance of the paperboard can be improved.
Preferably, the white cardboard for packaging comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top in sequence;
the first coating and the third coating have the same composition and are prepared from a first coating, wherein the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 20-40 parts of hydroxy polydimethylsiloxane, 60-80 parts of modified sodium silicate, 5-20 parts of an auxiliary agent A, 4-12 parts of an auxiliary agent B and 100-200 parts of a solvent;
the second coating and the fourth coating have the same composition and are prepared from a second coating, wherein the second coating comprises, by weight, 80 parts of amino resin emulsion, 10-20 parts of citric acid, 40-50 parts of modified sodium silicate, 5-15 parts of an auxiliary agent A, 4-10 parts of an auxiliary agent B and 100-180 parts of a solvent;
The preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of (4-10): (5-12): (3-12): (35-60): (30-40), wherein the temperature during mixing is 40-60 ℃, the stirring speed during mixing is 800-1200 rpm, and the mixing time is 2-5 hours, so as to prepare the modified sodium silicate;
the auxiliary agent A comprises sodium methylene bis (methylbenzene) sulfonate, a defoaming agent and dodecanol ester;
The auxiliary B comprises isocyanate.
Preferably, the paper substrate is a white cardboard commonly found in the market, namely a conventional white cardboard. Such as a white cardboard with a specification of 200-300g/m 2. Specifically, for example, a white cardboard with a specification of 210g/m 2、230g/m2、250g/m2、280g/m2.
The second aspect of the invention provides a preparation method of a white cardboard for packaging.
Specifically, the preparation method of the white cardboard for packaging comprises the following steps:
taking the components for preparing the first coating, and mixing the components to prepare the first coating;
taking the components for preparing the second coating, and mixing the components to prepare the second coating;
And (3) taking the paper substrate, sequentially coating a first coating and a second coating on the surface of the paper substrate, coating the first coating and the second coating, and then heating and curing to obtain the white cardboard.
Preferably, the preparation method of the first coating comprises the following steps: the aqueous hydroxy acrylic resin emulsion, the hydroxy polydimethylsiloxane, the modified sodium silicate, the auxiliary agent A and the solvent are weighed according to the proportion, stirred and mixed for 30-60 minutes at the stirring speed of 800-1500 rpm, and then the auxiliary agent B is added and mixed to prepare the first coating.
Preferably, the preparation method of the second coating comprises the following steps: and (3) weighing the amino resin emulsion, the citric acid, the modified sodium silicate, the auxiliary agent A and the solvent according to the proportion, stirring and mixing for 20-50 minutes at the stirring speed of 600-1500 rpm, and then adding the auxiliary agent B for mixing to prepare the second coating.
Preferably, the first and second coatings are applied in an amount of 3-15g/m 2, preferably 4-12g/m 2, per application.
Preferably, the temperature of the heating and curing is 90-150 ℃, and the temperature of the heating and curing is 8-15 minutes.
A third aspect of the invention provides the use of a white cardboard.
The white cardboard is applied to the packaging field. The white cardboard of the present invention can be used in any packaging field where the paper has any requirements for moisture resistance, oxygen resistance and oil release.
Preferably, the application is in the field of food packaging.
Compared with the prior art, the invention has the following beneficial effects:
(1) The white cardboard comprises a paper base material and 4 coating layers positioned on the surface of the paper base material, wherein the first coating layer and the third coating layer have the same composition, and the second coating layer and the fourth coating layer have the same composition. The first coating for preparing the first coating comprises aqueous hydroxy acrylic resin emulsion, hydroxy polydimethylsiloxane, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent. The modified sodium silicate is coated on the surface of a paper substrate, a space network structure is formed by the reaction of aqueous hydroxy acrylic resin emulsion and hydroxy polydimethylsiloxane, and the modified sodium silicate is uniformly dispersed in the formed space network structure. The modified sodium silicate is obtained by modifying nano sodium silicate by adopting a silane coupling agent, nano silicon dioxide, polyethylene glycol and water; the modified sodium silicate not only can be used as filler, but also can be uniformly filled in a space network structure formed by the reaction of the aqueous hydroxy acrylic resin emulsion and the hydroxy polydimethylsiloxane, thereby playing a good role in preventing water vapor, oxygen and oil. The second coating consists of amino resin emulsion, modified sodium silicate, an auxiliary agent A, an auxiliary agent B and a solvent. The modified sodium silicate is uniformly dispersed in the second coating (in addition, because the modified sodium silicate is modified, the modified sodium silicate can be uniformly dispersed in the first coating and the second coating at the same time), so that the modified sodium silicate plays a good role in preventing water vapor, oxygen and oil. And on the surface of the paper substrate, through the alternate coordination of the first coating, the second coating, the third coating and the fourth coating, the water vapor, oxygen and oil preventing performance of the white cardboard can be obviously improved, and the white cardboard can also be improved to have strong tolerance to high-temperature and low-temperature water-containing foods and is not easy to crack.
(2) Citric acid is also introduced into the second coating, and due to the characteristics of polyhydroxy and carbon skeletons of the citric acid, amino resin emulsion is matched to react with the auxiliary agent B, a network skeleton with a structure different from that of the first coating can be formed, the dispersion of modified sodium silicate is more facilitated, and certain interaction is formed on the structure with the first coating, so that the effects of water vapor prevention, oxygen prevention and oil proofing are better improved, and the tolerance capability to high-temperature and low-temperature water-containing foods is strong.
Drawings
Fig. 1 is a schematic structural diagram of a white cardboard prepared in example 1 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples will be presented. It should be noted that the following examples do not limit the scope of the invention.
The starting materials, reagents or apparatus used in the following examples are all available from conventional commercial sources or may be obtained by methods known in the art unless otherwise specified.
Example 1: preparation of white cardboard
The white cardboard for packaging sequentially comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top;
The first coating and the third coating have the same composition and are prepared from the first coating, wherein the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 22 parts of hydroxy polydimethylsiloxane, 65 parts of modified sodium silicate, 6 parts of an auxiliary agent A (1 part of sodium methylenebis (methylbenzenesulfonate), 4 parts of polydimethylsiloxane, 1 part of dodecanol ester), 6 parts of an auxiliary agent B (6 parts of lysine diisocyanate) and 180 parts of a solvent (water);
The second coating and the fourth coating have the same composition and are prepared from the second coating, wherein the second coating comprises, by weight, 80 parts of amino resin emulsion, 45 parts of modified sodium silicate, 5 parts of auxiliary agent A (1 part of sodium methylenebis (methyl) benzenesulfonate, 3 parts of polydimethylsiloxane, 1 part of dodecanol ester), 5 parts of auxiliary agent B (5 parts of lysine diisocyanate) and 180 parts of solvent (water);
The preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent KH560, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of 5:8:7:50:30, the temperature at the time of mixing was 50 ℃, the stirring speed at the time of mixing was 1000 rpm, and the time of mixing was 2 hours.
The paper substrate is white cardboard with the specification of 230g/m 2.
Fig. 1 is a schematic structural diagram of a white cardboard prepared in example 1 of the present invention. Wherein 100 denotes a paper substrate, 200 denotes a first coating layer, 300 denotes a second coating layer, 400 denotes a third coating layer, and 500 denotes a fourth coating layer.
A preparation method of a white cardboard for packaging comprises the following steps:
Weighing the aqueous hydroxy acrylic resin emulsion, the hydroxy polydimethylsiloxane, the modified sodium silicate, the auxiliary agent A and the solvent according to a proportion, stirring and mixing for 40 minutes at a stirring speed of 1000 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a first coating;
Weighing the amino resin emulsion, the modified sodium silicate, the auxiliary agent A and the solvent according to the proportion, stirring and mixing for 40 minutes at the stirring speed of 700 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a second coating;
And (3) taking a paper substrate (white cardboard with the specification of 230g/m 2), sequentially coating a first coating (with the coating amount of 8g/m 2), a second coating (with the coating amount of 6g/m 2) on the surface of the paper substrate, and then coating the first coating (with the coating amount of 8g/m 2) and the second coating (with the coating amount of 6g/m 2) again, namely, alternately and repeatedly coating the first coating and the second coating once, drying at 80 ℃ for 10 minutes, and keeping at 130 ℃ for 13 minutes to obtain the white cardboard.
Example 2: preparation of white cardboard
The white cardboard for packaging sequentially comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top;
The first coating and the third coating have the same composition and are prepared from the first coating, wherein the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 22 parts of hydroxy polydimethylsiloxane, 65 parts of modified sodium silicate, 6 parts of an auxiliary agent A (1 part of sodium methylenebis (methylbenzenesulfonate), 4 parts of polydimethylsiloxane, 1 part of dodecanol ester), 6 parts of an auxiliary agent B (6 parts of lysine diisocyanate) and 180 parts of a solvent (water);
The second coating and the fourth coating have the same composition and are prepared from the second coating, wherein the second coating comprises, by weight, 80 parts of amino resin emulsion, 16 parts of citric acid, 45 parts of modified sodium silicate, 5 parts of an auxiliary agent A (1 part of sodium methylenebis (methylbenzenesulfonate), 3 parts of polydimethylsiloxane, 1 part of dodecanol ester), 5 parts of an auxiliary agent B (5 parts of lysine diisocyanate) and 180 parts of a solvent (water);
The preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent KH560, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of 5:8:7:50:30, the temperature at the time of mixing was 50 ℃, the stirring speed at the time of mixing was 1000 rpm, and the time of mixing was 2 hours.
The paper substrate is white cardboard with the specification of 230g/m 2.
A preparation method of a white cardboard for packaging comprises the following steps:
Weighing the aqueous hydroxy acrylic resin emulsion, the hydroxy polydimethylsiloxane, the modified sodium silicate, the auxiliary agent A and the solvent according to a proportion, stirring and mixing for 40 minutes at a stirring speed of 1000 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a first coating;
Weighing the amino resin emulsion, the citric acid, the modified sodium silicate, the auxiliary agent A and the solvent according to the proportion, stirring and mixing for 40 minutes at the stirring speed of 700 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a second coating;
And (3) taking a paper substrate (white cardboard with the specification of 230g/m 2), sequentially coating a first coating (with the coating amount of 8g/m 2), a second coating (with the coating amount of 6g/m 2) on the surface of the paper substrate, and then coating the first coating (with the coating amount of 8g/m 2) and the second coating (with the coating amount of 6g/m 2) again, namely, alternately and repeatedly coating the first coating and the second coating once, drying at 80 ℃ for 10 minutes, and keeping at 130 ℃ for 13 minutes to obtain the white cardboard.
Example 3: preparation of white cardboard
The white cardboard for packaging sequentially comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top;
the first coating and the third coating have the same composition and are prepared from the first coating, wherein the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 30 parts of hydroxy polydimethylsiloxane, 75 parts of modified sodium silicate, 8 parts of an auxiliary agent A (1 part of sodium methylenebis (methylbenzenesulfonate), 5 parts of polydimethylsiloxane, 2 parts of dodecanol ester), 8 parts of an auxiliary agent B (6 parts of lysine diisocyanate, 2 parts of triethylene tetramine) and 200 parts of a solvent (water);
The second coating and the fourth coating have the same composition and are prepared from the second coating, wherein the second coating comprises, by weight, 80 parts of amino resin emulsion, 40 parts of modified sodium silicate, 5 parts of an auxiliary agent A (1 part of sodium methylenebis (methyl) benzenesulfonate, 3 parts of polydimethylsiloxane, 1 part of dodecanol ester), 6 parts of an auxiliary agent B (5 parts of lysine diisocyanate, 1 part of triethylene tetramine) and 180 parts of a solvent (water);
the preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent KH570, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of 5:10:8:55:35, the temperature during mixing is 55 ℃, the stirring speed during mixing is 1000 revolutions per minute, and the mixing time is 2.5 hours, thus obtaining the modified sodium silicate.
The paper substrate is white cardboard with the specification of 230g/m 2.
A preparation method of a white cardboard for packaging comprises the following steps:
Weighing the aqueous hydroxy acrylic resin emulsion, the hydroxy polydimethylsiloxane, the modified sodium silicate, the auxiliary agent A and the solvent according to a proportion, stirring and mixing for 40 minutes at a stirring speed of 1000 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a first coating;
Weighing the amino resin emulsion, the modified sodium silicate, the auxiliary agent A and the solvent according to the proportion, stirring and mixing for 40 minutes at the stirring speed of 700 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a second coating;
and (3) taking a paper substrate (white cardboard with the specification of 230g/m 2), sequentially coating a first coating (with the coating amount of 10g/m 2), a second coating (with the coating amount of 8g/m 2) on the surface of the paper substrate, and then coating the first coating (with the coating amount of 10g/m 2) and the second coating (with the coating amount of 8g/m 2) again, namely, alternately and repeatedly coating the first coating and the second coating once, drying at 85 ℃ for 10 minutes, and keeping at 135 ℃ for 11 minutes to obtain the white cardboard.
Example 4: preparation of white cardboard
The white cardboard for packaging sequentially comprises a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top;
The first coating and the third coating have the same composition and are prepared from the first coating, wherein the first coating comprises, by weight, 80 parts of aqueous hydroxy acrylic resin emulsion, 32 parts of hydroxy polydimethylsiloxane, 72 parts of modified sodium silicate, 8 parts of an auxiliary agent A (1 part of sodium methylenebis (methylbenzenesulfonate), 5 parts of polydimethylsiloxane, 2 parts of dodecanol ester), 8 parts of an auxiliary agent B (6 parts of lysine diisocyanate, 2 parts of triethylene tetramine) and 200 parts of a solvent (water);
The second coating and the fourth coating have the same composition and are prepared from the second coating, wherein the second coating comprises, by weight, 80 parts of amino resin emulsion, 13 parts of citric acid, 41 parts of modified sodium silicate, 5 parts of an auxiliary agent A (1 part of sodium methylenebis (methyl) benzenesulfonate, 3 parts of polydimethylsiloxane, 1 part of dodecanol ester), 6 parts of an auxiliary agent B (5 parts of lysine diisocyanate, 1 part of triethylene tetramine) and 180 parts of a solvent (water);
The preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent KH570, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of 5:9:9:55:35, the temperature during mixing is 55 ℃, the stirring speed during mixing is 1000 revolutions per minute, and the mixing time is 2.5 hours, thus obtaining the modified sodium silicate.
The paper substrate is white cardboard with the specification of 230g/m 2.
A preparation method of a white cardboard for packaging comprises the following steps:
Weighing the aqueous hydroxy acrylic resin emulsion, the hydroxy polydimethylsiloxane, the modified sodium silicate, the auxiliary agent A and the solvent according to a proportion, stirring and mixing for 40 minutes at a stirring speed of 1000 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a first coating;
Weighing the amino resin emulsion, the citric acid, the modified sodium silicate, the auxiliary agent A and the solvent according to the proportion, stirring and mixing for 40 minutes at the stirring speed of 700 revolutions per minute, and then adding the auxiliary agent B for mixing to prepare a second coating;
and (3) taking a paper substrate (white cardboard with the specification of 230g/m 2), sequentially coating a first coating (with the coating amount of 10g/m 2), a second coating (with the coating amount of 8g/m 2) on the surface of the paper substrate, and then coating the first coating (with the coating amount of 10g/m 2) and the second coating (with the coating amount of 8g/m 2) again, namely, alternately and repeatedly coating the first coating and the second coating once, drying at 85 ℃ for 10 minutes, and keeping at 135 ℃ for 11 minutes to obtain the white cardboard.
Comparative example 1
Comparative example 1 differs from example 1 only in that the same amount of aqueous hydroxy acrylic resin emulsion was used instead of hydroxy polydimethylsiloxane in the first coating of comparative example 1, and the remaining components and procedures were the same as in example 1.
Comparative example 2
In comparison with example 1, comparative example 2 is different only in that in the first coating material and the second coating material of comparative example 2, nano sodium silicate is not modified, but an equivalent amount of nano sodium silicate is used instead of modified sodium silicate, and the remaining components and processes are the same as example 1.
Comparative example 3
In comparison with example 1, the white cardboard in comparative example 3 was prepared as follows: and (3) taking a paper substrate (white cardboard with the specification of 230g/m 2), sequentially coating a first coating (the coating amount is 8g/m 2), a first coating (the coating amount is 8g/m 2), then coating a second coating (the coating amount is 6g/m 2) and a second coating (the coating amount is 6g/m 2) on the surface of the paper substrate, namely, the first coating and the second coating are not alternately coated, then drying at 80 ℃ for 10 minutes, and then keeping at 130 ℃ for 13 minutes to obtain the white cardboard. The first paint and the second paint in comparative example 3 are the same as in example 1.
Product effect test
1. Test of water vapor and oxygen preventing and oil preventing properties
The white cardboard prepared in the above examples 1-2 and comparative examples 1-3 was allowed to stand at 25℃and 80% relative humidity for 24 hours and 60 hours, and the white cardboard was tested for water vapor permeability and oxygen permeability.
The oil-proof property test is to make the white cardboard into a cup shape, put soybean oil in the cup (the soybean oil is contacted with the fourth coating of the white cardboard), stand for 12 hours at 0 ℃ and 40 ℃ respectively, and circulate 8 times to observe whether the white cardboard is permeated by the soybean oil (permeation grade is divided into four grades of large permeation, medium permeation, small permeation and no permeation, and the four grades are marked as grade D, grade C, grade B and grade A in turn, the grade A is not visible and the oil-proof effect is optimal), and the result is shown in table 1.
TABLE 1
As can be seen from Table 1, the white cardboard prepared in the examples 1-2 of the present invention has good barrier properties to water vapor, oxygen and oil, and the properties are obviously better than those of the comparative examples 1-3. Therefore, the use of the hydroxyl polydimethylsiloxane, the modification method of the nano sodium silicate and the coating sequence of the coating on the surface of the paper substrate (after the coating sequence of the first coating and the second coating is changed in comparative example 3, only one contact interface between the first coating and the second coating can be formed, so that the waterproof, the oxygen-proof and the oil-proof performances of the white cardboard are reduced to some extent) have obvious influence on the waterproof, the oxygen-proof and the oil-proof performances of the white cardboard.
2. High and low temperature resistance performance test
The white cardboard of examples 1-2 and comparative example 2 was folded into a paper cup, and ice water of 0℃was placed in the paper cup (water was brought into contact with the fourth coating layer of the white cardboard) and left for 12 hours (when left, the ice water temperature was kept at 0 ℃) and then the ice water was poured off, and then water of 100℃was placed again and left for 12 hours (when left, the water temperature was kept at 100 ℃) and then the water was poured off and then the ice water of 0℃was placed in the paper cup and left for 12 hours, and the circulation was continued until the wet cracking phenomenon occurred in the paper cup, and the number of circulation times of the ice water of 0℃and the water of 100℃added when the wet cracking phenomenon occurred in the paper cup was counted, and the results are shown in Table 2.
TABLE 2
As can be seen from Table 2, the white cardboard of the paper cup of example 1-2 of the present invention has significantly better high and low temperature resistance than that of comparative example 2. And as can be seen from the results of examples 1-2, the high-temperature and low-temperature resistance of the white cardboard can be significantly improved after the citric acid is added into the second coating.
The white cardboard performance of examples 3-4 is similar to that of examples 1-2.
Claims (5)
1. The white cardboard is characterized by sequentially comprising a paper substrate, a first coating, a second coating, a third coating and a fourth coating from bottom to top;
The first coating and the third coating have the same composition and are prepared from a first coating, and the first coating comprises the following components in parts by weight: 80 parts of aqueous hydroxy acrylic resin emulsion, 20-40 parts of hydroxy polydimethylsiloxane, 60-80 parts of modified sodium silicate, 5-20 parts of auxiliary agent A, 4-12 parts of auxiliary agent B and 100-200 parts of solvent;
the second coating and the fourth coating have the same composition and are both prepared from a second coating, and the second coating comprises the following components in parts by weight: 80 parts of amino resin emulsion, 10-20 parts of citric acid, 40-50 parts of modified sodium silicate, 5-15 parts of auxiliary agent A, 4-10 parts of auxiliary agent B and 100-180 parts of solvent;
The preparation process of the modified sodium silicate comprises the following steps: the silane coupling agent, nano silicon dioxide, polyethylene glycol, water and nano sodium silicate are mixed according to the weight ratio of (4-10): (5-12): (3-12): (35-60): (30-40), wherein the temperature during mixing is 40-60 ℃, the stirring speed during mixing is 800-1200 rpm, and the mixing time is 2-5 hours, so as to prepare the modified sodium silicate;
the auxiliary agent A comprises sodium methylene bis (methylbenzene) sulfonate, a defoaming agent and dodecanol ester;
The auxiliary B comprises isocyanate.
2. The method for preparing the white cardboard according to claim 1, comprising the steps of:
taking the components for preparing the first coating, and mixing the components to prepare the first coating;
taking the components for preparing the second coating, and mixing the components to prepare the second coating;
And (3) taking the paper substrate, sequentially coating a first coating and a second coating on the surface of the paper substrate, coating the first coating and the second coating, and then heating and curing to obtain the white cardboard.
3. The preparation method according to claim 2, wherein the preparation method of the first coating is: proportionally weighing aqueous hydroxy acrylic resin emulsion, hydroxy polydimethylsiloxane, modified sodium silicate, an auxiliary agent A and a solvent, stirring and mixing for 30-60 minutes at a stirring speed of 800-1500 rpm, and then adding an auxiliary agent B for mixing to prepare a first coating; the preparation method of the second coating comprises the following steps: and (3) weighing the amino resin emulsion, the citric acid, the modified sodium silicate, the auxiliary agent A and the solvent according to the proportion, stirring and mixing for 20-50 minutes at the stirring speed of 600-1500 rpm, and then adding the auxiliary agent B for mixing to prepare the second coating.
4. The method of claim 2, wherein the first and second coatings are applied in an amount of 3-15g/m 2 per application.
5. Use of the white cardboard of claim 1 in the packaging field.
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