CN115926679A - Preparation process of composite floor formaldehyde-free adhesive - Google Patents
Preparation process of composite floor formaldehyde-free adhesive Download PDFInfo
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- CN115926679A CN115926679A CN202211547170.2A CN202211547170A CN115926679A CN 115926679 A CN115926679 A CN 115926679A CN 202211547170 A CN202211547170 A CN 202211547170A CN 115926679 A CN115926679 A CN 115926679A
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- China
- Prior art keywords
- plant starch
- free adhesive
- diglycidyl
- stirring
- composite floor
- Prior art date
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- 239000000853 adhesive Substances 0.000 title claims abstract description 43
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 30
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- NEPKLUNSRVEBIX-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) benzene-1,4-dicarboxylate Chemical compound C=1C=C(C(=O)OCC2OC2)C=CC=1C(=O)OCC1CO1 NEPKLUNSRVEBIX-UHFFFAOYSA-N 0.000 claims description 3
- KIKYOFDZBWIHTF-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) cyclohex-3-ene-1,2-dicarboxylate Chemical compound C1CC=CC(C(=O)OCC2OC2)C1C(=O)OCC1CO1 KIKYOFDZBWIHTF-UHFFFAOYSA-N 0.000 claims description 3
- XFUOBHWPTSIEOV-UHFFFAOYSA-N bis(oxiran-2-ylmethyl) cyclohexane-1,2-dicarboxylate Chemical compound C1CCCC(C(=O)OCC2OC2)C1C(=O)OCC1CO1 XFUOBHWPTSIEOV-UHFFFAOYSA-N 0.000 claims description 3
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Images
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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to the field of preparation of environment-friendly adhesives, and discloses a preparation process of a composite floor formaldehyde-free adhesive, which comprises the following steps: s1: preparing 30-100 parts by mass of plant starch raw materials for later use; s2: adding the plant starch raw material into a reaction kettle, adding sodium hydroxide solution and cold water, mixing and stirring to obtain gelatinized plant starch slurry; s3: pretreating a mixture of various colloidal plant starch slurries in an ultrasonic reaction kettle, heating, gradually adding glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water, and stirring to obtain a mixed colloidal material; s4: and (3) mixing and stirring the plant starch slurry obtained in the step (2) and the mixed colloid material with the waste heat in the step (3), and naturally cooling to obtain the formaldehyde-free adhesive.
Description
Technical Field
The invention relates to the field of preparation of environment-friendly adhesives, in particular to a preparation process of a composite floor formaldehyde-free adhesive.
Background
With the rapid development of the economy in China and the great improvement of the living standard of people, the domestic architectural decoration and furniture industries grow up rapidly, and the rapid development of the artificial composite floor industry in China is promoted, so that the demand of the adhesive for the composite floor is increased, and most of the composite floors use phenolic resin. The phenolic resin is one of the polymers developed and applied at present, and has the characteristics of high temperature resistance, good water resistance, good chemical stability and the like. Phenolic resins are therefore used in a wide variety of industrial products such as the production of carbon foams, molded products, electrical laminates, circuit boards, and as coatings and adhesives. Raw materials for preparing the phenolic resin adhesive are from petroleum industry and belong to non-renewable resources, and formaldehyde and phenol are respectively identified as 1 and 3 carcinogens by the international agency for research on cancer (IARC) in 2004 and 2017. Therefore, in the face of the increasing scarcity of petroleum resources, the toxicity of phenolic compounds and the carcinogenicity of formaldehyde, researchers are forced to look at biomass. At present, the bio-based adhesive is used for partially or completely replacing phenol and formaldehyde to become an effective alternative method for producing formaldehyde-free wood adhesive, and a preparation process of the formaldehyde-free adhesive for the composite floor is provided for the purpose.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation process of a composite floor formaldehyde-free adhesive, which solves the problems.
In order to achieve the above purpose, the invention provides the following technical scheme: a preparation process of a composite floor formaldehyde-free adhesive comprises the following steps:
s1: preparing 30-100 parts by mass of plant starch raw materials for later use;
s2: adding the plant starch raw material into a reaction kettle, adding sodium hydroxide solution and cold water, mixing and stirring to obtain gelatinized plant starch slurry;
s3: pretreating a mixture of various colloidal plant starch slurries in an ultrasonic reaction kettle, heating, gradually adding glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water, and continuously stirring to obtain a mixed colloidal material;
s4: and (3) mixing and stirring the plant starch slurry obtained in the step (2) with the mixed colloid material with the waste heat in the step (3) within 30 minutes for 15-20min, and naturally cooling to obtain the aldehyde-free adhesive.
Preferably, the preparation of the plant starch raw material in S1 comprises the following steps:
s11: cleaning starch plant raw materials, and soaking for more than 12 h;
s12: then steaming and boiling the soaked raw materials at the temperature of 100 ℃;
s13: and finally, grinding and filtering the cooked starch plant raw material to obtain the plant starch raw material.
Preferably, in the process of mixing the colloidal materials in the step S2, the pH value of the materials is adjusted to 9-10 by sodium hydroxide solution for gelling, the sodium hydroxide solution accounts for 30-40 parts by mass, the materials are mixed for 30min at a temperature of 75-90 ℃, and then the materials are mixed with cold water and stirred.
Preferably, the glycidyl ester epoxy resin in S3 can be one or more selected from diglycidyl phthalate, diglycidyl hexahydrophthalate, diglycidyl terephthalate, diglycidyl isophthalate, diglycidyl tetrahydrophthalate, diglycidyl methyltetrahydrophthalate, diglycidyl endomethyltetrahydrophthalate and diglycidyl adipate.
Preferably, the polyvinyl alcohol in S3 can be selected from one or more of polyvinyl alcohol 1788, 1799, 2488, 2499 or modified polyvinyl alcohol, preferably polyvinyl alcohol 2488.
Preferably, the preparation method of the modifier in S3 comprises the following steps:
s31: grinding the wormwood according to the formula proportion, adding an ethanol solution with the volume fraction of 90%, performing ultrasonic extraction for 1 hour at 400W, filtering, taking a filtrate, heating and refluxing for 50 minutes at 70 ℃, and taking a residue to obtain a wormwood concentrated solution for later use;
s32: grinding the mint according to the formula proportion, adding 90% of ethanol solution by volume, performing ultrasonic extraction for 20 minutes in an ultrasonic cleaning machine, filtering, taking filtrate, heating and refluxing at 70 ℃ for 20 minutes, and taking residue to obtain mint concentrated solution for later use;
s33: and (4) mixing the wormwood concentrated solution obtained in the step (S31) and the mint concentrated solution obtained in the step (S32) to obtain the modifier.
Preferably, the pretreatment time of the plant starch slurry mixture in the S3 in an ultrasonic reaction kettle is 20min, and the ultrasonic power is 300W;
when glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water are added, the temperature is synchronously raised to 50-55 ℃, the materials are mixed and stirred in a reaction kettle for 20-30min, and the stirring speed is kept at 110r/min.
Compared with the prior art, the invention provides a preparation process of the aldehyde-free adhesive for the composite floor, which has the following beneficial effects:
1. the preparation process of the composite floor formaldehyde-free adhesive takes various plant starches as basic raw materials for preparation, firstly, the preparation cost of the adhesive is reduced, mainly the plant starches are pollution-free and do not cause environmental pollution, the preparation process of the adhesive is taken as the raw materials for preparation of the adhesive, the environmental protection of the adhesive is improved, and in the preparation process, the release of free formaldehyde in the production process and the use process of the adhesive is controlled from the source; when the adhesive is used as the adhesive for the composite floor, the internal bonding strength reaches the national second-class plate requirement; simple production process, good stability, and simple and feasible quality control method.
Drawings
FIG. 1 is a schematic view of the flow structure of the preparation process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a process for preparing a composite floor formaldehyde-free adhesive comprises the following steps:
s1: preparing 30-100 parts by mass of plant starch raw materials for later use;
s2: adding the plant starch raw material into a reaction kettle, adding sodium hydroxide solution and cold water, mixing and stirring to obtain gelatinized plant starch slurry;
s3: pretreating a mixture of various colloidal plant starch slurries in an ultrasonic reaction kettle, heating, gradually adding glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water, and continuously stirring to obtain a mixed colloidal material;
s4: and (3) mixing and stirring the plant starch slurry obtained in the step (2) with the mixed colloid material with the waste heat in the step (3) within 30 minutes for 15-20min, and naturally cooling to obtain the aldehyde-free adhesive.
The preparation method of the plant starch raw material in the S1 comprises the following steps:
s11: cleaning starch plant raw materials, and soaking for more than 12 h;
s12: then the soaked raw materials are steamed and boiled at the temperature of 100 ℃;
s13: and finally, grinding and filtering the cooked starch plant raw material to obtain the plant starch raw material.
In the process of mixing colloid materials in S2, the pH value of the materials is adjusted to 9-10 by sodium hydroxide solution for gelling, the sodium hydroxide solution accounts for 30-40 parts by weight, and the materials are mixed for 30min at the temperature of 75-90 ℃ and then mixed with cold water for stirring.
The glycidyl ester epoxy resin in S3 can be one or more of diglycidyl phthalate, diglycidyl hexahydrophthalate, diglycidyl terephthalate, diglycidyl isophthalate, diglycidyl tetrahydrophthalate, diglycidyl methyltetrahydrophthalate, diglycidyl endomethyltetrahydrophthalate and diglycidyl adipate.
The polyvinyl alcohol in S3 can be one or more of polyvinyl alcohol 1788, 1799, 2488 and 2499 or modified polyvinyl alcohol, and is preferably polyvinyl alcohol 2488.
The environment-friendly plasticizer used in the process is synthetic vegetable ester, is a composite agent which is sanitary, has excellent plasticizing effect, does not emit oil and is environment-friendly, and the synthetic vegetable ester is a novel environment-friendly plasticizer which is used for replacing plasticizers such as dioctyl phthalate (DOP)/dibutyl phthalate (DBP) or ATBC/DOTP and the like, and saves capital resources. The synthetic vegetable ester is a novel environment-friendly plasticizer, is extracted from various plants, is esterified under the action of a series of catalysts to generate the novel environment-friendly nontoxic plasticizer, and is used for PVC products, the usage amount of the synthetic vegetable ester is respectively as high as 55 parts (100 parts of resin powder), and no precipitation phenomenon exists; the substitution rate is between 30% and 100%. If the composition is used with DOP and DBP, the effect is better.
Main varieties of epoxy plasticizers: epoxidized soybean oil, epoxy acetyl methyl linoleate, epoxy butyl furoate, epoxy butyl pupate oleate, epoxy octyl soybean oleate, 9, 10-epoxy octyl stearate and the like; the environmental protection plasticizer is also selected in the process, so that the environmental protection property of the prepared adhesive can be improved.
The defoaming agent can reduce the surface tension of water, solution, suspension and the like, and has strong defoaming force and small using amount; the addition to the foaming system does not affect the basic properties of the system, i.e. does not react with the system to be defoamed; the surface tension is small; good balance with the surface and good heat resistance; good diffusivity and permeability, and high positive spreading coefficient; the chemical stability and the oxidation resistance are strong; the gas solubility and the permeability are good; the solubility in foaming solution is small; no physiological activity and high safety;
the foaming agent can be classified into five types, i.e., solid particle type, emulsion type, dispersion type, oil type and paste type, according to various classification criteria; according to the application of the defoaming agent in different industrial production, the defoaming agent can be divided into a textile industry defoaming agent, a paper industry defoaming agent, a coating industry defoaming agent, a food industry defoaming agent, a petroleum industry defoaming agent and the like; according to the chemical structure and composition of the defoaming agent, the defoaming agent can be divided into mineral oil, alcohols, fatty acid and fatty acid esters, amides, phosphates, silicones, polyethers and polyether modified polysiloxane defoaming agents.
Four types of non-silicon type, polyether type, silicone type and polyether modified silicone type are described below.
Non-silicon type
The non-silicon type defoaming agent mainly comprises organic matters such as alcohols, fatty acids, fatty acid esters, phosphate esters, mineral oils and amides, the amides comprise monoamide, bisamide and the like which are commonly used, and other nitrogen-containing compounds such as trialkyl melamine, cyanuric chloride melamine, fatty amine and the like; phosphoric acid esters including monoalkyl, dialkyl, and fluorinated alkyl phosphates, etc., are commonly used for defoaming of paint detergent products; carboxylates include three classes of substances: fatty acids such as lauric acid, palmitic acid, and the like; fatty acid esters such as fatty acid glycerides, animal and vegetable oils, and the like; fatty acid soaps, such as calcium, aluminum, magnesium soaps of stearic and palmitic acids; aliphatic alcohols and ethers include straight and branched chain alcohols and ethers.
The defoaming agent is low in price, is suitable for being used under the conditions of small liquid shearing force and mild foaming capacity of the contained surfactant, is easy to obtain preparation raw materials, high in environmental protection performance and low in production cost, but has low defoaming efficiency on compact foam, and has continuously shrunk market share due to strong specificity. In some special industries, such as strong acid, strong alkali, etc., acid and alkali resistant non-silicon type defoaming agents, such as teflon insert, are needed.
Polyether type
The polyether defoamer is a copolymer of ethylene oxide and propylene oxide, and the defoaming effect is achieved mainly by utilizing different characteristics of solubility of the polyether defoamer shown at different temperatures. At low temperatures, the polyether is dispersed in water, and as the temperature increases, the hydrophilicity of the polyether gradually decreases, and the polyether is rendered insoluble until the cloud point, thus exerting defoaming action. The cloud point can be changed by adjusting the types of the polyether and the proportion of the raw materials in the preparation process, so that the polyether can be applied to different industries.
The polyether type defoaming agent has the advantages of strong foam inhibition capability, high temperature resistance and the like, and has the defects of certain toxicity, limited use condition by temperature, low foam breaking rate and narrow use field. If the amount of the foam generated is large, the foam cannot be quickly eliminated, and the defoaming effect can be shown only by adding the defoaming agent into the foam again.
Polyether defoamers are mainly classified into GP type, GPE type and GPES type.
The GP type is obtained by polymerizing propylene oxide with ethylene oxide or propylene oxide with glycerol. Its foam suppressing ability in a foaming medium is higher than its defoaming ability. Is commonly used as a defoaming agent in the production of biological pesticides, yeasts and the like.
The GPE defoaming agent is mainly prepared by adding ethylene oxide to the tail end of a polypropylene glycol chain segment (GP type defoaming agent) to become a polyoxyethylene oxypropylene glycerol chain end of a hydrophilic group. It is easy to dissolve in medium, has strong defoaming capability, but has larger solubility and poorer foam inhibition performance, and is commonly used as a defoaming agent in the antibiotic fermentation process in the pharmaceutical industry.
The GPES type is a novel polyether type defoaming agent obtained by esterifying the tail end of a GPE type defoaming agent with stearic acid. The molecules with the structure have increased lipophilicity and reduced hydrophilicity, and are easy to gather in a gas-liquid interface, so that the defoaming efficiency is high.
Of the organosilicon type
Polydimethylsiloxane (also called silicone oil) is the main component of silicone-type defoaming agents. Compared with H2O and common oils, the silicone oil has smaller surface tension, and is suitable for both water-based foaming systems and oil-based foaming systems. In H2O and common oil, the silicone oil has high activity and low solubility, and the basic characteristics of the silicone oil are stable chemical property, wide application range, low volatility, no toxicity, prominent defoaming capability and the like, and the defect of poor foam inhibition performance is that the silicone oil has high activity and low solubility.
The types of such defoaming agents mainly include solid type, emulsion type, solution type and oil type.
The solid defoaming agent has the characteristics of good stability, simple process, convenience in transportation, convenience in use and the like. The water-soluble polymer is suitable for both oil phase and water phase, has outstanding medium dispersibility, and is widely applied in the field of low (no) foam washing powder.
The silicone oil in the emulsion type defoaming agent has larger tension and large emulsification difficulty coefficient, and once the emulsifier is selected improperly, the phenomena of layering, deterioration and the like of the defoaming agent in a short time can be caused. The stability of the emulsion is very critical to the quality of the defoaming agent, so the preparation of the emulsion type silicon defoaming agent focuses on the selection of the emulsifying agent. Meanwhile, the emulsion type defoaming agent has the characteristics of low price, wide application range, obvious defoaming effect and the like, and is used in the largest amount in the organic silicon defoaming agent. With the progress of formulation technology, emulsion type defoaming agents are developed greatly.
The solution type defoaming agent is a solution prepared by dissolving silicone oil in a solvent, and the defoaming principle is as follows: the silicone oil component is carried and dispersed in the foaming solution by the solvent, and in the process, the silicone oil is gradually condensed into droplets, thereby completing defoaming. The silicone oil is dissolved in a nonaqueous organic solution system, for example, polychlorinated ethane, toluene, etc., and can be defoamed as an oily solution.
The silicone oil is dissolved in an aqueous solution, for example, ethylene glycol, glycerin, etc., and can be defoamed as an aqueous solution. It should be noted that the cost of the solvent is increased while the dispersibility of the defoaming agent is improved, and if the stirring speed and the stirring force in the preparation process are insufficient, the solvent is easy to diffuse, and the silicone oil is condensed into oil beads with large particle size and poor defoaming activity.
The higher cost simethicone is generally suitable for defoaming oil-soluble solutions. Generally, a high viscosity foaming system is selected for a low viscosity defoamer and a low viscosity foaming system is selected for a high viscosity defoamer.
Polyether modified organosilicon type
The defoaming agent is a silicon ether copolymer obtained by modifying and grafting a polyether chain segment or a polysiloxane chain segment, and organically combines the advantages of the polyether chain segment and the polysiloxane chain segment to obtain a novel efficient defoaming agent which has the advantages of good dispersibility, strong foam inhibition capability, stability, no toxicity, low volatility, strong defoaming effect and the like.
(1) Characteristics of polyether modified organic silicon type defoaming agent
Reverse solubility: the polysiloxane polyether type defoaming agent has cloud point characteristics of the polyether defoaming agent due to the polyether chain segment contained in the molecule, and can be conveniently selected and applied based on the temperature requirement of system defoaming.
Self-emulsifying property: because the hydrophobic and hydrophilic properties of the siloxane chain segment and the polyether chain segment to the solvent are different, when the polyether modified organic silicon type defoaming agent is added into the solvent, the polyether chain segment extends to the outside, and the polysiloxane chain segment is curled to the inside, so that a dispersed state is formed, namely self-emulsifying property. The defoaming agent can be quickly and uniformly dispersed in the foaming liquid under the action of self-emulsifying property, has outstanding stability and is beneficial to the comprehensive exertion of the functions of foam inhibition and defoaming. The ratio of the polyether chain segment and the siloxane chain segment is adjusted, so that the defoaming agent is suitable for foaming solutions with different properties.
(2) Polyether modified organosilicon type defoaming agent
According to different internal linking modes, polyether modified organic silicon type defoaming agents can be divided into the following two types:
the-Si-O-C-bond linked copolymer prepared by taking acid as a catalyst is easy to hydrolyze and has poor stability. If amine buffers are present, longer retention times can be achieved. But has very obvious development potential due to low price.
The copolymer linked by the-Si-C-bond has a stable structure and can be stored for more than two years under a closed condition. However, the expensive platinum is used as a catalyst in the production process, so that the production cost of the defoaming agent is high, and the defoaming agent is not widely applied.
The preparation method of the modifier in S3 comprises the following steps:
s31: grinding folium Artemisiae Argyi at a formula ratio, adding 90% ethanol solution, ultrasonic extracting at 400W for 1 hr, filtering, collecting filtrate, heating and refluxing at 70 deg.C for 50 min, and collecting residue to obtain folium Artemisiae Argyi concentrated solution;
s32: grinding herba Menthae according to formula proportion, adding 90% ethanol solution, ultrasonic extracting for 20min with ultrasonic cleaning machine, filtering, collecting filtrate, heating and refluxing at 70 deg.C for 20min, collecting residue to obtain herba Menthae concentrated solution;
s33: and (4) mixing the wormwood concentrated solution obtained in the step (S31) and the mint concentrated solution obtained in the step (S32) to obtain the modifier.
S3, pretreating the plant starch slurry mixture in an ultrasonic reaction kettle for 20min, wherein the ultrasonic power is 300W;
when glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water are added, the temperature is synchronously raised to 50-55 ℃, the materials are mixed and stirred in a reaction kettle for 20-30min, and the stirring speed is kept at 110r/min.
The preparation process of the composite floor formaldehyde-free adhesive takes various plant starches as basic raw materials for preparation, firstly, the preparation cost of the adhesive is reduced, mainly the plant starches are pollution-free and do not cause pollution to the environment, the preparation process is taken as the raw materials for the adhesive, the environmental protection of the adhesive is improved, and in the preparation process, the release of free formaldehyde in the production process and the use process of the adhesive is controlled from the source; when the adhesive is used as the adhesive for the composite floor, the internal bonding strength reaches the national second-class plate requirement; simple production process, good stability, and simple and feasible quality control method.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The preparation process of the composite floor formaldehyde-free adhesive is characterized by comprising the following steps of:
s1: preparing 30-100 parts by mass of plant starch raw materials for later use;
s2: adding the plant starch raw material into a reaction kettle, adding sodium hydroxide solution and cold water, mixing and stirring to obtain gelatinized plant starch slurry;
s3: pretreating a mixture of various colloidal plant starch slurries in an ultrasonic reaction kettle, heating, gradually adding glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water, and continuously stirring to obtain a mixed colloidal material;
s4: and (3) mixing and stirring the plant starch slurry obtained in the step (S2) with the mixed colloid material with the waste heat in the step (S3) within 30 minutes for 15-20min, and naturally cooling to obtain the aldehyde-free adhesive.
2. The process for preparing the aldehyde-free adhesive for the composite floor as claimed in claim 1, wherein the preparation of the plant starch raw material in the S1 comprises the following steps:
s11: cleaning starch plant material, and soaking for more than 12 hr;
s12: then the soaked raw materials are steamed and boiled at the temperature of 100 ℃;
s13: and finally, grinding and filtering the cooked starch plant raw material to obtain the plant starch raw material.
3. The preparation process of the composite floor formaldehyde-free adhesive according to claim 1, wherein in the step of mixing the colloid material in the step S2, the pH of the material is adjusted to 9-10 by sodium hydroxide solution for gelling, the sodium hydroxide solution is 30-40 parts by mass, and the colloid material is mixed for 30min at a temperature of 75-90 ℃ and then mixed with cold water for stirring.
4. The process for preparing a composite floor formaldehyde-free adhesive according to claim 1, wherein the glycidyl ester epoxy resin in S3 is selected from one or more of diglycidyl phthalate, diglycidyl hexahydrophthalate, diglycidyl terephthalate, diglycidyl isophthalate, diglycidyl tetrahydrophthalate, diglycidyl methyltetrahydrophthalate, diglycidyl endomethyltetrahydrophthalate and diglycidyl adipate.
5. The process for preparing the aldehyde-free adhesive for composite floors as claimed in claim 1, wherein the polyvinyl alcohol in S3 is selected from one or more of polyvinyl alcohol 1788, 1799, 2488, 2499 or modified polyvinyl alcohol, preferably polyvinyl alcohol 2488.
6. The process for preparing the aldehyde-free adhesive for the composite floor as claimed in claim 1, wherein the step of preparing the modifier in S3 comprises the steps of:
s31: grinding the wormwood according to the formula proportion, adding an ethanol solution with the volume fraction of 90%, performing ultrasonic extraction for 1 hour at 400W, filtering, taking a filtrate, heating and refluxing for 50 minutes at 70 ℃, and taking a residue to obtain a wormwood concentrated solution for later use;
s32: grinding the mint according to the formula proportion, adding 90% of ethanol solution by volume, performing ultrasonic extraction for 20 minutes in an ultrasonic cleaning machine, filtering, taking filtrate, heating and refluxing at 70 ℃ for 20 minutes, and taking residue to obtain mint concentrated solution for later use;
s33: and (4) mixing the wormwood concentrated solution obtained in the step (S31) and the mint concentrated solution obtained in the step (S32) to obtain the modifier.
7. The process for preparing the aldehyde-free adhesive for the composite floor as claimed in claim 1, wherein the pretreatment time of the plant starch slurry mixture in the ultrasonic reaction kettle in S3 is 20min, and the ultrasonic power is 300W;
when glycidyl ester epoxy resin, polyvinyl alcohol, an environment-friendly plasticizer, a defoaming agent, a modifier, a flame retardant and water are added, the temperature is synchronously raised to 50-55 ℃, the materials are mixed and stirred in a reaction kettle for 20-30min, and the stirring speed is kept at 110r/min.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117025128A (en) * | 2023-10-09 | 2023-11-10 | 烟台中品环保科技有限公司 | Aldehyde-free adhesive for cereal fragrance plate and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117025128A (en) * | 2023-10-09 | 2023-11-10 | 烟台中品环保科技有限公司 | Aldehyde-free adhesive for cereal fragrance plate and preparation method thereof |
| CN117025128B (en) * | 2023-10-09 | 2023-12-19 | 烟台中品环保科技有限公司 | Aldehyde-free adhesive for cereal fragrance plate and preparation method thereof |
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