CN116005489A - Tea dreg molding packaging paper and preparation method thereof - Google Patents
Tea dreg molding packaging paper and preparation method thereof Download PDFInfo
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- CN116005489A CN116005489A CN202211594099.3A CN202211594099A CN116005489A CN 116005489 A CN116005489 A CN 116005489A CN 202211594099 A CN202211594099 A CN 202211594099A CN 116005489 A CN116005489 A CN 116005489A
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 61
- 238000000465 moulding Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229920001661 Chitosan Polymers 0.000 claims abstract description 30
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 29
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 28
- 229920000858 Cyclodextrin Polymers 0.000 claims abstract description 25
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000010902 straw Substances 0.000 claims abstract description 20
- 239000006185 dispersion Substances 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 241000209140 Triticum Species 0.000 claims abstract description 10
- 235000021307 Triticum Nutrition 0.000 claims abstract description 10
- 239000010893 paper waste Substances 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 8
- 235000009566 rice Nutrition 0.000 claims abstract description 8
- 238000004880 explosion Methods 0.000 claims abstract description 5
- 238000004537 pulping Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 240000007594 Oryza sativa Species 0.000 claims abstract 2
- 241001122767 Theaceae Species 0.000 claims description 74
- 238000000034 method Methods 0.000 claims description 20
- 229920002472 Starch Polymers 0.000 claims description 10
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 10
- 239000008107 starch Substances 0.000 claims description 10
- 235000019698 starch Nutrition 0.000 claims description 10
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 235000013339 cereals Nutrition 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 2
- 244000269722 Thea sinensis Species 0.000 abstract 5
- 239000000123 paper Substances 0.000 description 77
- 235000013616 tea Nutrition 0.000 description 65
- 238000010521 absorption reaction Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 241000209094 Oryza Species 0.000 description 6
- 230000002209 hydrophobic effect Effects 0.000 description 6
- 125000003277 amino group Chemical group 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 125000003700 epoxy group Chemical group 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011436 cob Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000003205 fragrance Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 208000010445 Chilblains Diseases 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 239000001116 FEMA 4028 Substances 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- 229920001046 Nanocellulose Polymers 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 description 1
- 235000011175 beta-cyclodextrine Nutrition 0.000 description 1
- 229960004853 betadex Drugs 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011088 parchment paper Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- 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
- Wrappers (AREA)
- Paper (AREA)
Abstract
The application relates to the technical field of packaging paper, and relates to tea dreg molding packaging paper and a preparation method thereof, wherein the preparation method of the tea dreg molding packaging paper comprises the following preparation steps: s1, crushing waste paper, rice straw and wheat straw to obtain crushed materials; s2, crushing tea leaves, stirring and mixing the crushed tea leaves with water, performing steam explosion, and screening the obtained slurry to obtain prefabricated slurry; s3, adding a silane coupling agent, cyclodextrin and chitosan quaternary ammonium salt into water, and stirring until the mixture is dissolved to obtain a dispersion liquid; s4, adding the dispersion liquid obtained in the step S3 and the crushed material obtained in the step S1 into the prefabricated slurry obtained in the step S2, adding an auxiliary agent for pulping, forming to obtain a wet paper web, and drying the obtained wet paper web at the temperature of more than or equal to 80 ℃ to obtain tea dreg molding packaging paper; which has the advantage of reducing the hygroscopicity of the wrapper.
Description
Technical Field
The application relates to the technical field of packaging paper, in particular to tea dreg molding packaging paper and a preparation method thereof.
Background
The packaging paper is a generic name of a type of paper for packaging purposes, and generally needs to have high strength and toughness, high physical strength and certain water resistance, and be capable of withstanding pressure and folding. The wrapping paper may be classified into kraft paper, chicken paper, paper bag paper, parchment paper, cellophane paper, neutral wrapping paper, translucent paper, rust-preventive paper, oil-proof paper, food wrapping paper, etc. The packaging paper is mainly used for beautifying and protecting commodities, and needs to have certain physical strength and characteristics showing the characteristics of the commodities. Such as tea wrap, which has some conventional properties, in order to embody tea aroma, the tea wrap may have some tea aroma, thereby increasing the characteristics of tea wrap.
In the related art, the fresh tea leaves, the nanocellulose and the polylactic acid fibers are used as raw materials to prepare the packaging paper with tea fragrance, so that a characteristic is formed. However, using fresh tea leaves for making the wrapper is wasteful for the tea leaves. In the tea beverage industry, a large amount of tea residues can be generated, and in the related method for recycling the tea residues, the tea residues are used as raw materials of foot soaking medicine bags for recycling, and because of the temperature of cooked tea, foot soaking can promote blood circulation of feet, so that the whole body channels and collaterals are smoother, chilblain can be prevented and treated, and the method has good foot warming effect in winter, and is particularly effective for middle-aged and elderly people. However, this recycling method is difficult to perform for such large amounts of tea grounds.
The inventor tries to use tea residues for preparing packaging paper so as to realize the purposes that the packaging paper tape has tea aroma and the tea residues are recycled. However, due to the ripeness of tea residues, the fiber structure of the tea residues is damaged to a certain extent, and after the packaging paper is prepared, the packaging paper has tea fragrance, but due to the fact that the binding force between the fibers of the tea residues and a system is poor, cracks or micropores are easily generated in the packaging paper, so that the hygroscopicity of the packaging paper is high, and the storage of tea leaves is not facilitated.
Disclosure of Invention
In order to reduce the hygroscopicity of the packaging paper, the application provides a tea dreg molding packaging paper and a preparation method thereof.
In a first aspect, the present application provides a method for preparing a tea-leaf molded package paper, which adopts the following technical scheme:
a preparation method of tea dreg molding packaging paper comprises the following preparation steps:
s1, crushing 13-17 parts by weight of waste paper, 11-15 parts by weight of rice straw and 10-14 parts by weight of wheat straw to obtain crushed materials;
s2, crushing 14-17 parts by weight of tea leaves until the grain size is less than or equal to 1cm, stirring and mixing with 28-34 parts by weight of water, performing steam explosion, and screening the obtained slurry to obtain prefabricated slurry;
s3, adding 0.1-0.3 part by weight of silane coupling agent, 0.1-0.3 part by weight of cyclodextrin and 0.2-0.4 part by weight of chitosan quaternary ammonium salt into 1160-1240 parts by weight of water, and stirring until the materials are dissolved to obtain a dispersion;
s4, adding the dispersion liquid obtained in the step S3 and the crushed material obtained in the step S1 into the prefabricated slurry obtained in the step S2, adding 0.20-0.3 part by weight of auxiliary agent for pulping, forming to obtain a wet paper web, and drying the obtained wet paper web at the temperature of more than or equal to 80 ℃ to obtain tea dreg molding packaging paper;
the molecular structure of the silane coupling agent contains one or more of amino, epoxy and hydroxyl.
By adopting the technical scheme, the outer edge of the cyclodextrin is hydrophilic, and the inner cavity is hydrophobic, so that the cyclodextrin can provide a hydrophobic binding site like enzyme, and is used as a host to encapsulate various proper objects such as organic molecules, inorganic ions, gas molecules and the like. The hydrophobic and hydrophilic nature of the inner cavity makes it possible to form inclusion compound and molecular assembling system with many organic and inorganic molecules based on Van der Waals force, hydrophobic interaction force, matching action between host and guest molecules, etc.
The chitosan quaternary ammonium salt has good film forming property and antibacterial property, and the structure of the chitosan quaternary ammonium salt contains more hydroxyl groups, and the quaternary ammonium salt group can improve the water solubility of molecules, but also has stronger hygroscopicity.
The silane coupling agent, cyclodextrin and chitosan quaternary ammonium salt are added, so that the silane coupling agent can be crosslinked with each other by utilizing hydrogen bonds in the process of forming and drying the packaging paper to form a three-dimensional network structure in a packaging paper system, wherein the silane coupling agent can be adsorbed on the particle surfaces of waste paper, tea leaves, rice straws and wheat straws, the molecular structure of the silane coupling agent contains amino groups, hydroxyl groups or epoxy groups and the like, and the three-dimensional network structure is formed between the cyclodextrin and the chitosan quaternary ammonium salt, so that the binding force among the particles of the waste paper, the tea leaves, the rice straws and the wheat straws is greatly improved, the cracks or micropores caused by adding the tea leaves are reduced, and the relative water absorption rate of the packaging paper is reduced; and through the formation of the three-dimensional network structure, the hygroscopicity of the chitosan quaternary ammonium salt can be greatly reduced, the hydrophobicity of chitosan is more reflected, and after the hydrophilic group in the cyclodextrin molecule forms a hydrogen bond, the hydrophilic group more reflects the hydrophobic effect, so that the relative water absorption of the packaging paper is greatly reduced.
As preferable: the content of the S3 is as follows:
adding 0.2 parts by weight of a silane coupling agent, 0.2 parts by weight of cyclodextrin and 0.3 parts by weight of chitosan quaternary ammonium salt into 1200 parts by weight of water, and stirring until the mixture is dissolved to obtain a dispersion liquid.
Through adopting above-mentioned technical scheme, through optimizing each raw materials ratio to the dispersion, can make the network structure in the wrapping paper system further strengthen to make crack and micropore in the wrapping paper further reduce, thereby reduced the relative water absorption of wrapping paper.
As preferable: the silane coupling agent is one or more of KH550, KH560 and A-171.
By adopting the technical scheme, the silane coupling agent can reduce the action of interfacial tension among raw material particles, and simultaneously, the epoxy group, the amino group and other groups contained in a molecular structure are used as a part participating in a network structure in a system, so that the compatibility, the binding force and the like between the tea dreg crushing materials and a packaging paper system can be greatly improved, and the problems of cracks, micropores and the like caused by the addition of tea dreg are reduced.
As preferable: the dispersion also comprises 0.05 to 0.15 parts by weight of carboxymethyl starch.
By adopting the technical scheme, after carboxymethyl starch is added, micropores formed in the packaging paper can be further filled, and the structure of the packaging paper contains carboxyl, and the packaging paper can also participate in a netty system formed by a silane coupling agent, cyclodextrin and chitosan quaternary ammonium salt through hydrogen bonds.
As preferable: the dispersion also included 0.1 parts by weight of carboxymethyl starch.
As preferable: and the drying temperature in the step S4 is less than or equal to 90 ℃.
By adopting the technical scheme, the drying temperature also has a certain influence on the relative water absorption of the packaging paper, the temperature is not lower than 80 ℃, is not higher than 90 ℃, and is not beneficial to the formation of a reticular structure in a system and the adsorption of the silane coupling agent on the surfaces of the raw material particles when the drying temperature exceeds 90 ℃.
As preferable: the auxiliary agent is one or more of hydroxypropyl methyl cellulose, polyacrylamide and hydroxyethyl cellulose.
In a second aspect, the present application provides a tea dreg molding wrapping paper, which adopts the following technical scheme:
a tea grounds molding wrapper made by the process for making a tea grounds molding wrapper of any one of claims 1-7.
By adopting the technical scheme, the relative water absorption of the packaging paper prepared by the preparation method of the tea dreg molding packaging paper in any one of claims 1-7 is between 0.28 and 0.56 percent, the tensile strength is higher than 4.31kN/m and above, and the packaging paper is placed for 24 hours under the environment of 75 ℃ and 85 percent of humidity, does not generate cracking and falling phenomena, and can be suitable for packaging general tea.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the silane coupling agent, cyclodextrin and chitosan quaternary ammonium salt are added, so that the silane coupling agent can be crosslinked with each other by utilizing hydrogen bonds in the process of forming and drying the packaging paper to form a three-dimensional network structure in a packaging paper system, wherein the silane coupling agent can be adsorbed on the particle surfaces of waste paper, tea leaves, rice straws and wheat straws, the molecular structure of the silane coupling agent contains amino groups, hydroxyl groups or epoxy groups and the like, and the three-dimensional network structure is formed between the cyclodextrin and the chitosan quaternary ammonium salt, so that the binding force among the particles of the waste paper, the tea leaves, the rice straws and the wheat straws is greatly improved, the cracks or micropores caused by adding the tea leaves are reduced, and the relative water absorption rate of the packaging paper is reduced; and through the formation of the three-dimensional network structure, the hygroscopicity of the chitosan quaternary ammonium salt can be greatly reduced, the hydrophobicity of chitosan is more reflected, and after the hydrophilic group in the cyclodextrin molecule forms a hydrogen bond, the hydrophilic group more reflects the hydrophobic effect, so that the relative water absorption of the packaging paper is greatly reduced.
2. After carboxymethyl starch is added, micropores formed inside the packaging paper can be further filled, and the structure of the packaging paper contains carboxyl, and the carboxyl can also participate in a netty system formed by a silane coupling agent, cyclodextrin and chitosan quaternary ammonium salt through hydrogen bonds.
3. The relative water absorption of the wrapping paper prepared by the application is between 0.28 and 0.56 percent, the tensile strength is higher than 4.31kN/m and is not cracked or fallen off when the wrapping paper is placed for 24 hours in an environment with the temperature of 75 ℃ and the humidity of 85 percent; the packaging paper prepared by the method has better waterproof property under the condition of no need of additional waterproof coating, and the tensile strength of the packaging paper can meet the requirements of subsequent processing steps.
Detailed Description
The present application is described in further detail below in conjunction with the detailed description.
Raw materials
Among the raw materials used in the present application, cyclodextrin is food-grade beta-cyclodextrin; the chitosan quaternary ammonium salt is food grade; the rest raw materials are all common commercial products.
Examples
Example 1
A tea dreg molding packaging paper comprises the following preparation processes:
s1, adding 15kg of waste paper, 13kg of rice straw and 12kg of wheat straw into a pulper for crushing to obtain crushed materials, wherein the crushed particle size is 40 meshes;
s2, crushing 15kg of tea leaves until the grain size is less than or equal to 1cm, stirring and mixing with 30kg of water for 24 hours, then performing steam explosion, wherein the explosion pressure is 2.0MPa, stabilizing the pressure for 10 minutes, and screening the obtained slurry through an 8-mesh flat screen to obtain prefabricated slurry;
s3, adding 0.1kg of KH550, 0.1kg of cyclodextrin and 0.2kg of chitosan quaternary ammonium salt into 1200kg of water, and stirring until the materials are dissolved to obtain a dispersion liquid;
s4, adding the dispersion liquid obtained in the step S3 and the crushed material obtained in the step S1 into the prefabricated slurry obtained in the step S2, adding 0.25kg of an auxiliary agent for pulping, wherein the auxiliary agent is hydroxypropyl methyl cellulose, the pulping degree is 45, forming into a wet paper web in a paper forming machine, drying the obtained wet paper web at 85 ℃ for 15min, shaping, inspecting, packaging and warehousing.
Example 2
A tea grounds molding wrapper was different from example 1 in that KH550 was added in an amount of 0.2kg in S3, and the other steps were the same as in example 1.
Example 3
A tea grounds molding wrapper was different from example 1 in that KH550 was added in an amount of 0.3kg in S3, and the other steps were the same as in example 1.
Example 4
A tea grounds molding wrapper was different from example 2 in that the cyclodextrin in S3 was added in an amount of 0.2kg, and the other steps were the same as in example 2.
Example 5
A tea grounds molding wrapper was different from example 2 in that the cyclodextrin in S3 was added in an amount of 0.3kg, and the other steps were the same as in example 2.
Example 6
A tea grounds molding wrapper was different from example 4 in that the added amount of chitosan quaternary ammonium salt in S3 was 0.3kg, and the other steps were the same as in example 4.
Example 7
A tea grounds molding wrapper was different from example 4 in that the added amount of chitosan quaternary ammonium salt in S3 was 0.4kg, and the other steps were the same as in example 4.
Example 8
A tea grounds molding wrapper is different from example 6 in that KH550 in S3 is replaced with A-171 of equal mass, and the rest of the steps are the same as those of example 6.
Example 9
A tea grounds molding wrapper is different from example 6 in that 0.05kg of carboxymethyl starch is added to S3, and the rest steps are the same as example 6.
Example 10
A tea grounds molding wrapper is different from example 6 in that 0.1kg of carboxymethyl starch is further added to S3, and the rest steps are the same as those of example 6.
Example 11
A tea grounds molding wrapper is different from example 6 in that 0.15kg of carboxymethyl starch is added to S3, and the rest steps are the same as those of example 6.
Example 12
A tea grounds molding wrapper is different from example 6 in that the drying temperature in S4 is 80℃and the other steps are the same as in example 6.
Example 13
A tea grounds molding wrapper is different from example 6 in that the drying temperature in S4 is 90℃and the remaining steps are the same as in example 6.
Example 14
A tea grounds molding wrapper is different from example 6 in that the auxiliary agent is polyacrylamide, and the rest steps are the same as those of example 6.
Example 15
A tea grounds molding wrapper is different from example 6 in that the auxiliary agent is hydroxyethyl cellulose, and the rest steps are the same as those of example 6.
Comparative example
Comparative example 1
A tea grounds molding wrapper was different from example 1 in that the dispersion was replaced with water of equal mass, and the rest of the procedure was the same as in example 1.
Comparative example 2
A tea grounds molding wrapper was different from example 1 in that KH550 added to the dispersion was replaced with water of equal mass, and the rest of the procedure was the same as in example 1.
Comparative example 3
A tea grounds molding wrapper was different from example 1 in that cyclodextrin added to the dispersion was replaced with water of equal mass, and the rest of the procedure was the same as in example 1.
Comparative example 4
A tea-leaf molded packaging paper is different from example 1 in that chitosan quaternary ammonium salt added in the dispersion liquid is replaced by water with the same mass, and the rest steps are the same as example 1.
Comparative example 5
A tea grounds molding wrapper is different from example 1 in that the drying temperature is 75℃and the other steps are the same as in example 1.
Performance test
Detection method/test method
The wrapping papers were prepared according to the preparation methods in examples 1 to 15 and comparative examples 1 to 5, respectively, and then examined according to the following examination methods, the examination results of which are shown in Table 1.
Relative water absorption: absolute water absorption was determined according to ISO 535:2014 and is measured in g/m 2 Cobb60 value of meter ("Cobb) 60 ") and then determined in g/m according to ISO 536:2012 2 After basis weight of wrapper ("FLG"), the passing ratio Cobb 60 Relative water absorption was calculated for/FLG.
Tensile strength test: the test was performed by the test method in ISO 1924-2008.
Wet heat resistance test: the wrapping paper was left to stand at 75℃in an environment having a humidity of 85% for 24 hours, and then the change in the wrapping paper was observed.
Thickness: by ISO534:2011 on a single layer, and the thickness of the wrapping paper is between 60 and 63 mu m according to detection.
TABLE 1 detection results for examples 1-15 and comparative examples 1-5
As can be seen from the data of examples 1 to 15 and comparative examples 1 to 5, and Table 1, the relative water absorption of the wrapping paper prepared by the present application is between 0.28 and 0.56%, the tensile strength is higher than 4.31kN/m and above, and the wrapping paper is not cracked or fallen off when being placed for 24 hours in an environment with a temperature of 75 ℃ and a humidity of 85%; the packaging paper prepared by the method has better waterproof property under the condition of no need of additional waterproof coating, and the tensile strength of the packaging paper can meet the requirements of subsequent processing steps.
According to the embodiment 1 and the comparative examples 1-4 and the detection data thereof, the silane coupling agent, the cyclodextrin and the chitosan quaternary ammonium salt are added, so that the silane coupling agent can be mutually crosslinked by utilizing hydrogen bonds in the process of forming and drying the packaging paper to form a three-dimensional network structure in the packaging paper system, wherein the silane coupling agent can be adsorbed on the surfaces of particles of waste paper, tea residues, straw and wheat straws, the molecular structure of the silane coupling agent contains amino groups, hydroxyl groups or epoxy groups and the like, and the three-dimensional network structure is formed between the silane coupling agent and the cyclodextrin and the chitosan quaternary ammonium salt, so that the binding force between the particles of the waste paper, the tea residues, the straw and the wheat straws is greatly improved, and the crack or micropore caused by adding the tea residues is reduced, and the waterproof property of the packaging paper is improved. In the case of the addition of the silane coupling agent in combination with examples 2 to 3, the relative water absorption of the wrapping paper was lowered, but when the addition amount thereof reached 0.2kg, it was hardly lowered any more.
By increasing the amount of cyclodextrin added, the three-dimensional network structure in the wrapper system can be further enhanced by examples 2 and 4-5, thereby reducing the relative water absorption and increasing the water resistance of the wrapper. In combination with examples 6 to 7, when the chitosan quaternary ammonium salt is added within a certain range, the relative water absorption rate of the packaging paper is reduced, but when the addition amount of the chitosan quaternary ammonium salt is 0.4kg, the relative water absorption rate is increased, probably because the three-dimensional network structure formed by the chitosan quaternary ammonium salt is too strong, density difference is generated in the chitosan quaternary ammonium salt, and a plurality of fine cracks are caused, so that the water resistance of the packaging paper is not facilitated when the addition amount of the chitosan quaternary ammonium salt is too large.
As can be seen from the examination data of example 6 and examples 9-11, the present application can further fill the micropores formed inside the packaging paper after adding carboxymethyl starch, and the structure of the packaging paper contains carboxyl groups, and the packaging paper can also participate in a network system formed by a silane coupling agent, cyclodextrin and chitosan quaternary ammonium salt through hydrogen bonds.
As can be seen from the examination data of examples 6 and examples 12-13, and comparative example 5, the temperature of the drying also has a certain effect on the relative water absorption of the wrapper, which is not preferred to be lower than 80℃and not preferred to be higher than 90 ℃.
By way of example 6, examples 14 to 15, the auxiliaries are hydroxypropyl methylcellulose, polyacrylamide or hydroxyethyl cellulose.
The foregoing embodiments are all preferred examples of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. A preparation method of tea dreg molding packaging paper is characterized in that: the preparation method comprises the following preparation steps:
s1, crushing 13-17 parts by weight of waste paper, 11-15 parts by weight of rice straw and 10-14 parts by weight of wheat straw to obtain crushed materials;
s2, crushing 14-17 parts by weight of tea leaves until the grain size is less than or equal to 1cm, stirring and mixing with 28-34 parts by weight of water, performing steam explosion, and screening the obtained slurry to obtain prefabricated slurry;
s3, adding 0.1-0.3 part by weight of silane coupling agent, 0.1-0.3 part by weight of cyclodextrin and 0.2-0.4 part by weight of chitosan quaternary ammonium salt into 1160-1240 parts by weight of water, and stirring until the materials are dissolved to obtain a dispersion;
s4, adding the dispersion liquid obtained in the step S3 and the crushed material obtained in the step S1 into the prefabricated slurry obtained in the step S2, adding 0.20-0.3 part by weight of auxiliary agent for pulping, forming to obtain a wet paper web, and drying the obtained wet paper web at the temperature of more than or equal to 80 ℃ to obtain tea dreg molding packaging paper;
the molecular structure of the silane coupling agent contains one or more of amino, epoxy and hydroxyl.
2. The method for preparing the tea dreg molded wrapping paper as claimed in claim 1, wherein: the content of the S3 is as follows:
adding 0.2 parts by weight of a silane coupling agent, 0.2 parts by weight of cyclodextrin and 0.3 parts by weight of chitosan quaternary ammonium salt into 1200 parts by weight of water, and stirring until the mixture is dissolved to obtain a dispersion liquid.
3. The method for preparing the tea dreg molded wrapping paper as claimed in claim 1, wherein: the silane coupling agent is one or more of KH550, KH560 and A-171.
4. The method for preparing the tea dreg molded wrapping paper as claimed in claim 1, wherein: the dispersion also comprises 0.05 to 0.15 parts by weight of carboxymethyl starch.
5. The method for preparing the tea dreg molded wrapping paper as claimed in claim 2, wherein: the dispersion also included 0.1 parts by weight of carboxymethyl starch.
6. The method for preparing the tea dreg molded wrapping paper as claimed in claim 1, wherein: and the drying temperature in the step S4 is less than or equal to 90 ℃.
7. The method for preparing the tea dreg molded wrapping paper as claimed in claim 1, wherein: the auxiliary agent is one or more of hydroxypropyl methyl cellulose, polyacrylamide and hydroxyethyl cellulose.
8. A tea dreg molding packaging paper is characterized in that: the packaging paper is prepared by the preparation method of the tea dreg molding packaging paper in any one of claims 1 to 7.
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