CN109438966B - High-strength composite packaging material and preparation method thereof - Google Patents
High-strength composite packaging material and preparation method thereof Download PDFInfo
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- 239000011091 composite packaging material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000010902 straw Substances 0.000 claims abstract description 155
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000853 adhesive Substances 0.000 claims abstract description 33
- 230000001070 adhesive effect Effects 0.000 claims abstract description 33
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000006260 foam Substances 0.000 claims abstract description 23
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- 239000002131 composite material Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 claims abstract description 14
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000004088 foaming agent Substances 0.000 claims abstract description 10
- 239000003054 catalyst Substances 0.000 claims abstract description 9
- 241000196324 Embryophyta Species 0.000 claims description 52
- 241000209094 Oryza Species 0.000 claims description 51
- 235000007164 Oryza sativa Nutrition 0.000 claims description 51
- 240000006394 Sorghum bicolor Species 0.000 claims description 51
- 235000011684 Sorghum saccharatum Nutrition 0.000 claims description 51
- 235000009566 rice Nutrition 0.000 claims description 51
- 238000002156 mixing Methods 0.000 claims description 41
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 25
- 239000007822 coupling agent Substances 0.000 claims description 23
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000002791 soaking Methods 0.000 claims description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 11
- 229920001353 Dextrin Polymers 0.000 claims description 10
- 239000004375 Dextrin Substances 0.000 claims description 10
- 235000019425 dextrin Nutrition 0.000 claims description 10
- FOGYNLXERPKEGN-UHFFFAOYSA-N 3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfopropyl)phenoxy]propane-1-sulfonic acid Chemical compound COC1=CC=CC(CC(CS(O)(=O)=O)OC=2C(=CC(CCCS(O)(=O)=O)=CC=2)OC)=C1O FOGYNLXERPKEGN-UHFFFAOYSA-N 0.000 claims description 9
- 239000004156 Azodicarbonamide Substances 0.000 claims description 9
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical group CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 9
- 230000032683 aging Effects 0.000 claims description 9
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 9
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 9
- 239000003431 cross linking reagent Substances 0.000 claims description 9
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 9
- 239000000194 fatty acid Substances 0.000 claims description 9
- 229930195729 fatty acid Natural products 0.000 claims description 9
- 239000012467 final product Substances 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 238000001723 curing Methods 0.000 claims description 2
- 239000004604 Blowing Agent Substances 0.000 claims 1
- 235000019441 ethanol Nutrition 0.000 claims 1
- 150000004665 fatty acids Chemical class 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- -1 fatty acid ethanol amide Chemical class 0.000 description 8
- 239000005022 packaging material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
Abstract
The invention provides a high-strength composite packaging material and a preparation method thereof, wherein the high-strength composite packaging material comprises the following components in parts by weight: 18-27 parts of plant straw, 43-56 parts of composite adhesive, 9-17 parts of foaming agent, 0.6-1.1 parts of foam stabilizer, 0.54-0.88 part of catalyst, 3-7 parts of talcum powder, 1-2.8 parts of diethyl phthalate, 3-9 parts of butanediol, 2-6 parts of glycerol and 12-20 parts of water. The tensile strength of the composite packaging material prepared by the invention can reach 18.72MPa, and the impact strength can reach 7.44 KJ.m‑2The bending strength can reach 26.56MPa, and the composite material has good mechanical properties.
Description
Technical Field
The invention relates to the field of packaging materials, in particular to a high-strength composite packaging material and a preparation method thereof.
Background
The packaging industry has developed into an important component of the national economy. The cushioning packaging material has good compression recovery, low cost and high application value, is favored by people, but can pollute the environment, and paper-made green cushioning packaging materials, such as corrugated boards, honeycomb paperboards, paper pulp molding and the like, are researched at home and abroad. Heavy weight, high cost, poor buffering performance and the like, and a large amount of harmful substances can be generated in the manufacturing process to pollute the atmosphere and water resources. In recent years, research on plant fiber buffer packaging materials becomes a new hotspot, and the straws of the crops attract attention of packaging researchers in recent years due to the characteristics of low price, natural degradation and the like.
Disclosure of Invention
The technical problem to be solved is as follows:
the invention aims to provide a high-strength composite packaging material and a preparation method thereof, and the material has good buffer performance, higher use value and wide development prospect.
The technical scheme is as follows:
the invention provides a high-strength composite packaging material which comprises the following components in parts by weight:
18-27 parts of plant straw,
43-56 parts of composite adhesive,
9-17 parts of foaming agent,
0.6-1.1 parts of foam stabilizer,
0.54 to 0.88 portion of catalyst,
3-7 parts of talcum powder,
1-2.8 parts of diethyl phthalate,
3-9 parts of butanediol,
2-6 parts of glycerol,
12-20 parts of water.
Preferably, the high-strength composite packaging material is prepared by mixing rice straws and sorghum straws in a weight ratio of 1: 1.
Preferably, the composite adhesive is prepared by the following preparation method:
(1) adding 45g of dextrin, 100g of distilled water, 1.4g of organic boron crosslinking agent ALP-3 and 20.78g of UN-7038 crosslinking agent into a 250mL three-neck flask provided with a stirrer and a reflux condenser, crosslinking for 0.5h at 95 ℃, and dropwise adding 0.01mol/L sodium hydroxide solution until the pH value is 9-10 to obtain the dextrin adhesive;
(2) adding 100g of waterborne polyurethane into a three-neck flask, then adding the dextrin adhesive prepared in the paste in the step (1), uniformly stirring, heating to 70 ℃, adding 0.48g of 20 wt% of organic boron crosslinking agent ALP-3 solution, reacting for 25min, adjusting the pH value of the solution to 6-7 by using 20 wt% of sodium hydroxide solution, heating to 85 ℃, continuing to react until the solution is semitransparent, and cooling to room temperature to obtain the composite adhesive.
Preferably, the foaming agent is azodicarbonamide.
Preferably, the foam stabilizer is formed by mixing fatty acid ethanol amide and lignosulfonic acid according to a weight ratio of 1: 1.
Preferably, in the high-strength composite packaging material, the catalyst is dibutyltin dilaurate. The invention also provides a preparation method of the high-strength composite packaging material, which comprises the following preparation steps:
(1) soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution, treating in a microwave oven after soaking, drying after treatment, and crushing by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out and drying;
(3) adding 18-27 parts of plant straw, 43-56 parts of composite adhesive, 3-7 parts of talcum powder, 1-2.8 parts of diethyl phthalate, 3-9 parts of butanediol, 2-6 parts of glycerol and 12-20 parts of water into a high-speed mixer, mixing, adding 9-17 parts of foaming agent, 0.6-1.1 part of foam stabilizer and 0.54-0.88 part of catalyst, stirring and mixing;
(4) and adding the mixed materials into a closed mold, placing the mold into a heating device for pre-foaming, curing, shaping and demolding to obtain a finished product.
Preferably, the preparation method of the high-strength composite packaging material comprises the following preparation steps:
(1) soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 18-27 parts of plant straw, 43-56 parts of composite adhesive, 3-7 parts of talcum powder, 1-2.8 parts of diethyl phthalate, 3-9 parts of butanediol, 2-6 parts of glycerol and 12-20 parts of water into a high-speed mixer, mixing for 20min, adding 9-17 parts of foaming agent, 0.6-1.1 part of foam stabilizer and 0.54-0.88 part of catalyst, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
Has the advantages that:
(1) the invention researches the preparation of a high-strength composite packaging material, and the high-strength composite packaging material with good performance is prepared by controlling plant straws, an adhesive, a foaming agent and other auxiliary agents, strictly controlling the dosage and the mutual proportion of each component and a certain process. China is a big agricultural country, and the cushion packaging material is produced by using agricultural residues as main raw materials, can replace foamed plastic and protect the environment, so the material has wide development prospect.
(2) The performance test of the prepared packaging material shows that the prepared packaging material has good buffering performance, can be used as a buffering packaging material for food, industrial products and electronic products, has high application value and can relieve white pollution.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The composite adhesives in examples 1-5 and comparative example 1 were prepared by the following preparation method:
(1) adding 45g of dextrin, 100g of distilled water, 1.4g of organic boron crosslinking agent ALP-3 and 20.78g of UN-7038 crosslinking agent into a 250mL three-neck flask provided with a stirrer and a reflux condenser, crosslinking for 0.5h at 95 ℃, and dropwise adding 0.01mol/L sodium hydroxide solution until the pH value is 9-10 to obtain the dextrin adhesive;
(2) adding 100g of waterborne polyurethane into a three-neck flask, then adding the dextrin adhesive prepared in the paste in the step (1), uniformly stirring, heating to 70 ℃, adding 0.48g of 20 wt% of organic boron crosslinking agent ALP-3 solution, reacting for 25min, adjusting the pH value of the solution to 6-7 by using 20 wt% of sodium hydroxide solution, heating to 85 ℃, continuing to react until the solution is semitransparent, and cooling to room temperature to obtain the composite adhesive.
Example 1
(1) Soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 27 parts of plant straws, 43 parts of composite adhesive, 7 parts of talcum powder, 1 part of diethyl phthalate, 9 parts of butanediol, 2 parts of glycerol and 12 parts of water into a high-speed mixer, mixing for 20min, adding 17 parts of azodicarbonamide, 0.6 part of foam stabilizer and 0.88 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
Example 2
(1) Soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 18 parts of plant straws, 56 parts of composite adhesive, 3 parts of talcum powder, 2.8 parts of diethyl phthalate, 3 parts of butanediol, 6 parts of glycerol and 20 parts of water into a high-speed mixer, mixing for 20min, adding 9 parts of azodicarbonamide, 1.1 parts of foam stabilizer and 0.54 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
Example 3
(1) Soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 24 parts of plant straws, 46 parts of composite adhesive, 6 parts of talcum powder, 1.5 parts of diethyl phthalate, 7 parts of butanediol, 3 parts of glycerol and 14 parts of water into a high-speed mixer, mixing for 20min, adding 15 parts of azodicarbonamide, 0.81 part of foam stabilizer and 0.75 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
Example 4
(1) Soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 20 parts of plant straws, 51 parts of composite adhesive, 4 parts of talcum powder, 2.2 parts of diethyl phthalate, 5 parts of butanediol, 5 parts of glycerol and 18 parts of water into a high-speed mixer, mixing for 20min, adding 11 parts of azodicarbonamide, 0.94 part of foam stabilizer and 0.63 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
Example 5
(1) Soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 22 parts of plant straws, 48 parts of composite adhesive, 5 parts of talcum powder, 1.9 parts of diethyl phthalate, 6 parts of butanediol, 4 parts of glycerol and 16 parts of water into a high-speed mixer, mixing for 20min, adding 13 parts of azodicarbonamide, 0.87 part of foam stabilizer and 0.69 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
Comparative example 1
The comparative example differs from example 1 in the preparation method. Specifically, the method comprises the following steps:
(1) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting plant straws crushed to 80 meshes into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out the plant straws, and drying the plant straws for 30min at 105 ℃;
(3) adding 27 parts of plant straws, 43 parts of composite adhesive, 7 parts of talcum powder, 1 part of diethyl phthalate, 9 parts of butanediol, 2 parts of glycerol and 12 parts of water into a high-speed mixer, mixing for 20min, adding 17 parts of azodicarbonamide, 0.6 part of foam stabilizer and 0.88 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
Comparative example 2
This comparative example differs from example 1 in the adhesive. Specifically, the method comprises the following steps:
(1) soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 27 parts of plant straw, 43 parts of polyvinyl alcohol, 7 parts of talcum powder, 1 part of diethyl phthalate, 9 parts of butanediol, 2 parts of glycerol and 12 parts of water into a high-speed mixer, mixing for 20min, adding 17 parts of azodicarbonamide, 0.6 part of foam stabilizer and 0.88 part of dibutyltin dilaurate, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
The plant straw is formed by mixing rice straw and sorghum straw according to the weight ratio of 1: 1.
The foam stabilizer is prepared by mixing fatty acid ethanol amide and lignosulfonic acid according to the weight ratio of 1: 1.
The materials prepared in examples 1 to 5 and comparative examples 1 to 2 were subjected to a performance test:
testing the tensile strength according to GB/T1447-2005, wherein the tensile speed is 5 mm/min; flexural strength and flexural modulus were measured in accordance with GB/T17657-1999, the loading rate was 5mm/min, and the impact strength was measured in accordance with GB/T17657-1999.
The test results are given in the following table:
TABLE 1
| Tensile strength/MPa | Impact Strength/(KJ. m)-2) | |
| Example 1 | 16.44 | 5.13 |
| Example 2 | 17.32 | 6.42 |
| Example 3 | 17.65 | 7.11 |
| Example 4 | 18.14 | 6.89 |
| Example 5 | 18.72 | 7.44 |
| Comparative example 1 | 14.32 | 4.26 |
| Comparative example 2 | 13.67 | 4.45 |
TABLE 2
According to test results, the plant straws are used as the main raw material, the plant straws are subjected to surface treatment and are mixed with the adhesive, the foaming agent and other auxiliary agents, the dosage and the mutual proportion of the components are strictly controlled, the high-strength composite packaging material is prepared by a certain process, the preparation process in the embodiment 5 is the best preparation process, and the material prepared by the method in the embodiment 5 can reach the tensile strength of 18.72MPa and the impact strength of 7.44 KJ.m.-2The bending strength can reach 26.56MPa, and the composite material has good mechanical properties.
According to the invention, the plant straws are soaked in hydrochloric acid, then subjected to microwave treatment, and then subjected to surface modification by using a coupling agent, so that the interfacial adhesion performance of the plant straws and an adhesive is improved, and the mechanical property of the material is improved. In the comparative example 1, only the plant straws are subjected to surface modification, the mechanical property of the material is remarkably reduced, and the prepared material has the tensile strength of 14.32MPa and the impact strength of 4.26 KJ.m-2The flexural strength was 19.66 MPa.
The invention self-prepares the adhesive, and compared with a starch adhesive, the dextrin adhesive has the advantages of better bonding strength, higher water resistance, simple and convenient operation and the like. In the comparative example 2, polyvinyl alcohol is used as an adhesive, the mechanical property of the material is remarkably reduced, and the prepared material has the tensile strength of 13.67MPa and the impact strengthIs 4.45KJ · m-2The flexural strength was 19.12 MPa.
Claims (7)
1. A high-strength composite packaging material comprises the following components in parts by weight: 18-27 parts of plant straw, 43-56 parts of composite adhesive, 9-17 parts of foaming agent, 0.6-1.1 parts of foam stabilizer, 0.54-0.88 part of catalyst, 3-7 parts of talcum powder, 1-2.8 parts of diethyl phthalate, 3-9 parts of butanediol, 2-6 parts of glycerol and 12-20 parts of water; the composite adhesive is characterized by being prepared by the following preparation method:
(1) adding 45g of dextrin, 100g of distilled water, 1.4g of organic boron crosslinking agents ALP-3 and 20.78gUN-7038 crosslinking agents into a 250mL three-neck flask provided with a stirrer and a reflux condenser, crosslinking for 0.5h at 95 ℃, and dropwise adding 0.01mol/L sodium hydroxide solution until the pH value is 9-10 to obtain the dextrin adhesive;
(2) and (2) adding 100g of waterborne polyurethane into a three-neck flask, then adding the dextrin adhesive prepared in the paste in the step (1), uniformly stirring, heating to 70 ℃, adding 0.48g of 20 wt% organic boron crosslinking agent ALP-3 solution, reacting for 25min, adjusting the pH value of the solution to 6-7 by using 20 wt% sodium hydroxide solution, heating to 85 ℃, continuing to react until the solution is semitransparent, and cooling to room temperature to obtain the composite adhesive.
2. The high-strength composite packaging material as claimed in claim 1, wherein the plant straw is formed by mixing rice straw and sorghum straw in a weight ratio of 1: 1.
3. The high strength composite packaging material of claim 2 wherein said blowing agent is azodicarbonamide.
4. The high-strength composite packaging material as claimed in claim 3, wherein the foam stabilizer is a mixture of fatty acid ethanolamide and lignosulfonic acid in a weight ratio of 1: 1.
5. The high strength composite packaging material of claim 4, wherein said catalyst is dibutyltin dilaurate.
6. The high-strength composite packaging material as claimed in claim 5, wherein the preparation method of the high-strength composite packaging material comprises the following preparation steps:
(1) soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution, treating in a microwave oven after soaking, drying after treatment, and crushing by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and absolute ethyl alcohol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out and drying;
(3) adding 18-27 parts of plant straw, 43-56 parts of composite adhesive, 3-7 parts of talcum powder, 1-2.8 parts of diethyl phthalate, 3-9 parts of butanediol, 2-6 parts of glycerol and 12-20 parts of water into a high-speed mixer, mixing, adding 9-17 parts of foaming agent, 0.6-1.1 part of foam stabilizer and 0.54-0.88 part of catalyst, stirring and mixing;
(4) and adding the mixed materials into a closed mold, placing the mold into a heating device for pre-foaming, curing, shaping and demolding to obtain a finished product.
7. The high-strength composite packaging material as claimed in claim 6, wherein the preparation method comprises the following preparation steps:
(1) soaking rice straws and sorghum straws in a 5 wt% hydrochloric acid solution for 24h, then placing the rice straws and the sorghum straws into a microwave oven, treating the rice straws and the sorghum straws with medium fire for 5 times and 2 min/time, drying the rice straws and the sorghum straws at 105 ℃, and crushing the rice straws and the sorghum straws to 80 meshes by using a high-speed crusher;
(2) preparing a solution from a KH550 silane coupling agent and ethanol according to a volume ratio of 1:5, putting the plant straws treated in the step (1) into a high-speed mixing stirrer, spraying the coupling agent solution while stirring until the plant straws are fully and uniformly soaked by the coupling agent solution, taking out, and drying at 105 ℃ for 30 min;
(3) adding 18-27 parts of plant straw, 43-56 parts of composite adhesive, 3-7 parts of talcum powder, 1-2.8 parts of diethyl phthalate, 3-9 parts of butanediol, 2-6 parts of glycerol and 12-20 parts of water into a high-speed mixer, mixing for 20min, adding 9-17 parts of foaming agent, 0.6-1.1 part of foam stabilizer and 0.54-0.88 part of catalyst, and stirring for 10 min;
(4) adding the mixed materials into a closed mold, placing into a heating device, pre-foaming at 100 deg.C for 15min, aging at 40 deg.C for 24h, shaping, and demolding to obtain the final product.
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Denomination of invention: A high-strength composite packaging material and its preparation method Granted publication date: 20210827 Pledgee: China Minsheng Bank Co.,Ltd. Wenzhou Cangnan Sub branch Pledgor: Wenzhou Rongyu Packaging Co.,Ltd. Registration number: Y2024980008407 |