CN111732816A - Preparation process of light high-water-locking modified melamine foam plastic - Google Patents
Preparation process of light high-water-locking modified melamine foam plastic Download PDFInfo
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- CN111732816A CN111732816A CN202010559380.8A CN202010559380A CN111732816A CN 111732816 A CN111732816 A CN 111732816A CN 202010559380 A CN202010559380 A CN 202010559380A CN 111732816 A CN111732816 A CN 111732816A
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- water
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- melamine foam
- modified melamine
- foam plastic
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- 239000006260 foam Substances 0.000 title claims abstract description 44
- 150000007974 melamines Chemical class 0.000 title claims abstract description 34
- 229920003023 plastic Polymers 0.000 title claims abstract description 28
- 239000004033 plastic Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 30
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 15
- 229920000877 Melamine resin Polymers 0.000 claims description 44
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 17
- -1 polysiloxane copolymer Polymers 0.000 claims description 17
- 238000005187 foaming Methods 0.000 claims description 16
- 239000004094 surface-active agent Substances 0.000 claims description 15
- 239000004088 foaming agent Substances 0.000 claims description 14
- 239000004640 Melamine resin Substances 0.000 claims description 11
- ORDRGXFSRBRQQG-UHFFFAOYSA-N 6-methylheptyl 2-sulfanylpropanoate Chemical compound CC(C)CCCCCOC(=O)C(C)S ORDRGXFSRBRQQG-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000008098 formaldehyde solution Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 10
- 229920000570 polyether Polymers 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 9
- 229920001228 polyisocyanate Polymers 0.000 claims description 6
- 239000005056 polyisocyanate Substances 0.000 claims description 6
- 229920006389 polyphenyl polymer Polymers 0.000 claims description 6
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 239000004604 Blowing Agent Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 229920000642 polymer Polymers 0.000 abstract description 3
- 229920002125 Sokalan® Polymers 0.000 abstract description 2
- 239000004584 polyacrylic acid Substances 0.000 abstract description 2
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 abstract 1
- 239000011358 absorbing material Substances 0.000 abstract 1
- 229940047670 sodium acrylate Drugs 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- 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
-
- 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
- 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
-
- 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
-
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- 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
- C08J2203/18—Binary blends of expanding agents
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08J2361/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08J2361/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
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- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
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- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/092—Polycarboxylic acids
Abstract
The invention discloses a preparation process of a light high water-locking modified melamine foam plastic, which adds a small amount of high water-absorbing material polymerThe sodium acrylate is used for achieving the effect of high water absorption, and in order to further improve the high water absorption and high water locking performance of the material, citric acid and graphene oxide are added in the preparation process of the material; the citric acid is added, so that part of sodium polyacrylate can be converted into polyacrylic acid, and macromolecular chain entanglement is formed, and the water locking effect is improved; and the graphene oxide belongs to a typical two-dimensional polymer structure, and is added, so that the entanglement of macromolecular chains formed by sodium polyacrylate reaction is further promoted, and the water locking effect is remarkably promoted. The density of the light high-water-locking modified melamine foam plastic prepared by the invention is 15-20kg/m3The water absorption rate can reach 900-.
Description
Technical Field
The invention belongs to the technical field of melamine products, and particularly relates to a preparation process of a light high-water-locking modified melamine foam plastic.
Background
The melamine foam plastic has excellent sound absorption performance, flame retardant performance, heat insulation performance, insulativity, heat and humidity resistance stability, safety, sanitation, secondary processing performance and the like, and is a novel foam plastic with a low-density three-dimensional grid structure, which is prepared by taking melamine as a main raw material and has the aperture ratio of up to 99.9%. The melamine foam plastic has wide application prospect in the fields of construction, traffic, vehicle manufacturing, acoustic engineering, electronic information, object surface cleaning and decontamination and the like.
In recent years, melamine foam is widely used in the field of daily necessities, for example, melamine foam has excellent flame retardant property and replaces polyurethane foam to prepare a seat cushion, but the research focus of the existing melamine foam is low water absorption, for example, chinese invention patent CN10658927A discloses a melamine foam prepolymer with high closed cell rate and a preparation method thereof, the patent discloses a melamine foam added with boron modifier, in the foaming process of melamine resin, the boron modified melamine prepolymer can rapidly react, a polymer with high crosslinking density is rapidly formed around the cells formed by a foaming agent, and the foamed cells are stabilized and maintained, so that melamine foam with high closed cell rate is prepared, and the closed cell rate reaches more than 95%. The research on the modified melamine foam plastic with high water absorption and high water locking is less, and in order to expand the application range of the modified melamine foam plastic, a preparation process of the light modified melamine foam plastic with high water locking is needed to be developed.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation process of a light high-water-locking modified melamine foam plastic.
The technical scheme of the invention is as follows:
a preparation process of a light high-water-locking modified melamine foam plastic comprises the following steps:
(1) adding melamine into formaldehyde solution, regulating pH value to 9-10 by triethanolamine, heating to 80-90 deg.C, reacting for 50-60min to obtain melamine formaldehyde resin, adding polyvinyl butyral, citric acid and polyether modified polysiloxane copolymer while stirring, introducing nitrogen, slowly adding sodium polyacrylate solution, reacting for 60-90min, adding concentrated hydrochloric acid to regulate pH value to neutrality, and dehydrating; obtaining modified melamine resin;
(2) uniformly mixing and stirring the modified melamine resin obtained in the step (1), a surfactant and a foaming agent to obtain a first material for later use;
(3) mixing and stirring isooctyl mercaptopropionate and a liquid curing agent uniformly to obtain a second material for later use;
(4) continuously stirring the first material obtained in the step (2) for 2-3h, preheating to 45-50 ℃, then adding the second material obtained in the step (3), and continuously stirring for 30-40min to obtain a mixture;
(5) and (4) transferring the mixture obtained in the step (4) to a microwave heating furnace for microwave foaming to generate the melamine foam plastic.
Preferably, in the step (1), the sodium polyacrylate solution is composed of sodium polyacrylate, graphene oxide and deionized water.
Further preferably, in the step (1), the mass ratio of the sodium polyacrylate, the graphene oxide and the deionized water is 0.5-1.2: 0.1-0.3: 100.
preferably, the mass concentration of the formaldehyde solution is 35-40%, and the mass ratio of melamine, formaldehyde, polyvinyl butyral, citric acid, polyether modified polysiloxane copolymer, sodium polyacrylate solution, surfactant, foaming agent, isooctyl mercaptopropionate and liquid curing agent is 1: 0.35-0.45: 0.2-0.3: 0.03-0.04: 0.05-0.1: 0.008-0.015: 0.8-1.2: 0.1-0.2: 0.7-0.8: 0.05-0.1.
Preferably, in the step (2), the surfactant is sodium dodecyl sulfate.
Preferably, in the step (2), the blowing agent is a mixture of azobisisobutyronitrile and polyphenyl polymethylene polyisocyanate. More preferably, the mass ratio of the two is 1: 1.
preferably, in the step (5), the microwave frequency of the microwave foaming furnace is 2000-2500MHz, the power is 350-450W, and the microwave foaming time is 5-8 min.
The invention has the advantages that: according to the preparation process of the light high-water-locking modified melamine foam plastic, a small amount of high-water-absorption material sodium polyacrylate is added into the traditional light melamine foam plastic, so that the high-water-absorption effect is achieved, and in order to further improve the high-water-absorption and high-water-locking performance of the material, citric acid and graphene oxide are added in the preparation process of the material; the citric acid is added, so that part of sodium polyacrylate can be converted into polyacrylic acid, and macromolecular chain entanglement is formed, and the water locking effect is improved; and the graphene oxide belongs to a typical two-dimensional polymer structure, and is added, so that the entanglement of macromolecular chains formed by sodium polyacrylate reaction is further promoted, and the water locking effect is remarkably promoted. The density of the light high-water-locking modified melamine foam plastic prepared by the invention is 15-20kg/m3The water absorption rate can reach 900-.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified. The reagents used in the following examples, unless otherwise specified, were purchased from conventional biochemical reagent stores.
Example 1
A preparation process of a light high-water-locking modified melamine foam plastic comprises the following steps:
(1) adding melamine into a formaldehyde solution, adjusting the pH value to 9.5 by using triethanolamine, heating to 88 ℃ for reaction for 55min to generate melamine formaldehyde resin, adding polyvinyl butyral, citric acid and polyether modified polysiloxane copolymer while stirring, introducing nitrogen, slowly adding a sodium polyacrylate solution, continuing to react for 70min, adding concentrated hydrochloric acid to adjust the pH value to be neutral, and dehydrating; obtaining modified melamine resin;
(2) uniformly mixing and stirring the modified melamine resin obtained in the step (1), a surfactant and a foaming agent to obtain a first material for later use;
(3) mixing and stirring isooctyl mercaptopropionate and a liquid curing agent uniformly to obtain a second material for later use;
(4) continuously stirring the first material obtained in the step (2) for 2.5h, preheating to 48 ℃, then adding the second material obtained in the step (3), and continuously stirring for 35min to obtain a mixture;
(5) and (4) transferring the mixture obtained in the step (4) to a microwave heating furnace for microwave foaming to generate the melamine foam plastic.
In the step (1), the sodium polyacrylate solution consists of sodium polyacrylate, graphene oxide and deionized water; the mass ratio of the sodium polyacrylate, the graphene oxide and the deionized water is 0.8: 0.25: 100.
the mass concentration of the formaldehyde solution is 37%, and the mass ratio of melamine, formaldehyde, polyvinyl butyral, citric acid, polyether modified polysiloxane copolymer, sodium polyacrylate solution, surfactant, foaming agent, isooctyl mercaptopropionate and liquid curing agent is 1: 0.42: 0.25: 0.035: 0.08: 0.012: 1.1: 0.18: 0.75: 0.07.
in the step (2), the surfactant is sodium dodecyl sulfate.
In the step (2), the foaming agent is a mixture of azodiisobutyronitrile and polyphenyl polymethylene polyisocyanate; the mass ratio of the two is 1: 1.
in the step (5), the microwave frequency of the microwave foaming furnace is 2280MHz, the power is 420W, and the microwave foaming time is 7 min.
Example 2
A preparation process of a light high-water-locking modified melamine foam plastic comprises the following steps:
(1) adding melamine into a formaldehyde solution, adjusting the pH value to 10 by using triethanolamine, heating to 80 ℃ for reaction for 60min to generate melamine formaldehyde resin, adding polyvinyl butyral, citric acid and polyether modified polysiloxane copolymer while stirring, introducing nitrogen, slowly adding a sodium polyacrylate solution, continuing the reaction for 60min, adding concentrated hydrochloric acid to adjust the pH value to be neutral, and dehydrating; obtaining modified melamine resin;
(2) uniformly mixing and stirring the modified melamine resin obtained in the step (1), a surfactant and a foaming agent to obtain a first material for later use;
(3) mixing and stirring isooctyl mercaptopropionate and a liquid curing agent uniformly to obtain a second material for later use;
(4) continuously stirring the first material obtained in the step (2) for 3 hours, preheating to 45 ℃, then adding the second material obtained in the step (3), and continuously stirring for 40min to obtain a mixture;
(5) and (4) transferring the mixture obtained in the step (4) to a microwave heating furnace for microwave foaming to generate the melamine foam plastic.
In the step (1), the sodium polyacrylate solution consists of sodium polyacrylate, graphene oxide and deionized water; the mass ratio of the sodium polyacrylate, the graphene oxide and the deionized water is 0.5: 0.3: 100.
the mass concentration of the formaldehyde solution is 35%, and the mass ratio of melamine, formaldehyde, polyvinyl butyral, citric acid, polyether modified polysiloxane copolymer, sodium polyacrylate solution, surfactant, foaming agent, isooctyl mercaptopropionate and liquid curing agent is 1: 0.45: 0.2: 0.04: 0.05: 0.015: 0.8: 0.1: 0.8: 0.05.
in the step (2), the surfactant is sodium dodecyl sulfate.
In the step (2), the foaming agent is a mixture of azodiisobutyronitrile and polyphenyl polymethylene polyisocyanate; the mass ratio of the two is 1: 1.2.
in the step (5), the microwave frequency of the microwave foaming furnace is 2000MHz, the power is 450W, and the microwave foaming time is 5 min.
Example 3
A preparation process of a light high-water-locking modified melamine foam plastic comprises the following steps:
(1) adding melamine into a formaldehyde solution, adjusting the pH value to 9 by using triethanolamine, heating to 90 ℃ for reaction for 50min to generate melamine formaldehyde resin, adding polyvinyl butyral, citric acid and polyether modified polysiloxane copolymer while stirring, introducing nitrogen, slowly adding a sodium polyacrylate solution, continuing the reaction for 90min, adding concentrated hydrochloric acid to adjust the pH value to be neutral, and dehydrating; obtaining modified melamine resin;
(2) uniformly mixing and stirring the modified melamine resin obtained in the step (1), a surfactant and a foaming agent to obtain a first material for later use;
(3) mixing and stirring isooctyl mercaptopropionate and a liquid curing agent uniformly to obtain a second material for later use;
(4) continuously stirring the first material obtained in the step (2) for 2 hours, preheating to 50 ℃, then adding the second material obtained in the step (3), and continuously stirring for 30min to obtain a mixture;
(5) and (4) transferring the mixture obtained in the step (4) to a microwave heating furnace for microwave foaming to generate the melamine foam plastic.
In the step (1), the sodium polyacrylate solution consists of sodium polyacrylate, graphene oxide and deionized water; the mass ratio of the sodium polyacrylate, the graphene oxide and the deionized water is 1.2: 0.1: 100.
the mass concentration of the formaldehyde solution is 35-40%, and the mass ratio of melamine, formaldehyde, polyvinyl butyral, citric acid, polyether modified polysiloxane copolymer, sodium polyacrylate solution, surfactant, foaming agent, isooctyl mercaptopropionate and liquid curing agent is 1: 0.35: 0.3: 0.03: 0.1: 0.008: 1.2: 0.2: 0.7: 0.1.
in the step (2), the surfactant is sodium dodecyl sulfate.
In the step (2), the foaming agent is a mixture of azodiisobutyronitrile and polyphenyl polymethylene polyisocyanate; the mass ratio of the two is 1.2: 1.
in the step (5), the microwave frequency of the microwave foaming furnace is 2500MHz, the power is 350W, and the microwave foaming time is 8 min.
Comparative example 1
The citric acid in example 1 was removed and the rest of the formulation and preparation method were unchanged.
Comparative example 2
The graphene oxide in example 1 was removed, and the rest of the formulation and preparation method were unchanged.
The following physical property tests were performed on the lightweight high water-locking modified melamine foams prepared in examples 1 to 3 and comparative examples 1 to 2, and the following test results were obtained, and the specific test data are shown in table 1.
1. And (3) testing mechanical properties: testing the compression performance according to GBT 8813-2008;
2. and (3) testing the density: weighing a sample of dry foam having a size of 300mm × 300mm × 500mm with an analytical balance to an accuracy of 0.001g, and then calculating a foam density;
3. and (3) water absorption measurement: testing according to GBT 8810-2005;
4. testing the water retention: the above-mentioned water-saturated sample was taken out and weighed every 24 hours under an environment of 25 ℃ to calculate the water retentivity (ratio of the mass of water held in the water-absorbent material to the original mass of the foam).
TABLE 1 results of physical Properties test of modified Melamine foams
| Density (kg/m)3） | Compressive Strength (kPa) | Water absorption% | Water retention (72 h)% | |
| Example 1 | 18 | 31.2 | 1127 | 843 |
| Example 2 | 17 | 30.7 | 1054 | 795 |
| Example 3 | 18 | 31.5 | 1172 | 871 |
| Comparative example 1 | 18 | 30.9 | 1069 | 767 |
| Comparative example 2 | 18 | 29.6 | 1015 | 541 |
As can be seen from the test data in Table 1, the melamine foam prepared by the invention has the remarkable characteristics of low density, high water absorption and high water locking.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A preparation process of a light high-water-locking modified melamine foam plastic is characterized by comprising the following steps:
(1) adding melamine into formaldehyde solution, regulating pH value to 9-10 by triethanolamine, heating to 80-90 deg.C, reacting for 50-60min to obtain melamine formaldehyde resin, adding polyvinyl butyral, citric acid and polyether modified polysiloxane copolymer while stirring, introducing nitrogen, slowly adding sodium polyacrylate solution, reacting for 60-90min, adding concentrated hydrochloric acid to regulate pH value to neutrality, and dehydrating; obtaining modified melamine resin;
(2) uniformly mixing and stirring the modified melamine resin obtained in the step (1), a surfactant and a foaming agent to obtain a first material for later use;
(3) mixing and stirring isooctyl mercaptopropionate and a liquid curing agent uniformly to obtain a second material for later use;
(4) continuously stirring the first material obtained in the step (2) for 2-3h, preheating to 45-50 ℃, then adding the second material obtained in the step (3), and continuously stirring for 30-40min to obtain a mixture;
(5) and (4) transferring the mixture obtained in the step (4) to a microwave heating furnace for microwave foaming to generate the melamine foam plastic.
2. The preparation process of the light high water-locking modified melamine foam plastic as claimed in claim 1, wherein in step (1), the sodium polyacrylate solution is composed of sodium polyacrylate, graphene oxide and deionized water.
3. The preparation process of the light high-water-locking modified melamine foam plastic as claimed in claim 2, wherein in the step (1), the mass ratio of the sodium polyacrylate, the graphene oxide and the deionized water is 0.5-1.2: 0.1-0.3: 100.
4. the preparation process of the light high water-locking modified melamine foam plastic as claimed in claim 1, wherein the mass concentration of the formaldehyde solution is 35-40%, and the mass ratio of melamine, formaldehyde, polyvinyl butyral, citric acid, polyether modified polysiloxane copolymer, sodium polyacrylate solution, surfactant, foaming agent, isooctyl mercaptopropionate and liquid curing agent is 1: 0.35-0.45: 0.2-0.3: 0.03-0.04: 0.05-0.1: 0.008-0.015: 0.8-1.2: 0.1-0.2: 0.7-0.8: 0.05-0.1.
5. The process for preparing the light weight high water-locking modified melamine foam according to claim 1, wherein in step (2), the surfactant is sodium dodecyl sulfate.
6. The process for preparing a lightweight, high water-locking modified melamine foam according to claim 1, wherein in step (2), said blowing agent is a mixture of azobisisobutyronitrile and polyphenyl polymethylene polyisocyanate.
7. The process for preparing a lightweight high water-locking modified melamine foam according to claim 6, wherein the mass ratio of azobisisobutyronitrile to polyphenyl polymethylene polyisocyanate is 1: 1.
8. the process for preparing the light melamine foam with high water-locking property as claimed in claim 1, wherein in the step (5), the microwave frequency of the microwave foaming furnace is 2000-2500MHz, the power is 350-450W, and the microwave foaming time is 5-8 min.
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