CN111454667A - Food-grade water-based adhesive and preparation method and application thereof - Google Patents
Food-grade water-based adhesive and preparation method and application thereof Download PDFInfo
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- CN111454667A CN111454667A CN202010353452.3A CN202010353452A CN111454667A CN 111454667 A CN111454667 A CN 111454667A CN 202010353452 A CN202010353452 A CN 202010353452A CN 111454667 A CN111454667 A CN 111454667A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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Abstract
The invention relates to the technical field of adhesives, in particular to a food-grade water-based adhesive and a preparation method thereof. A food-grade water-based adhesive at least comprises the following components in percentage by weight: 60-90% of polymer emulsion, 1-3% of plasticizer, 0.1-2% of defoaming agent, 0.1-5% of surfactant and water for supplementing 100%. The invention provides a food-grade water-based adhesive, which is mainly applied to the field of paper-plastic sealing, meets the food-grade requirement of the American FDA, and solves the problems that the common hot melt adhesive has poor adhesion to film and paper, has heavy smell of solvent-containing adhesive, is not environment-friendly and cannot meet the food-grade requirement; the glue provided by the invention is a water-based glue, so that the problems that the requirement of a common hot melt adhesive on operation is high and the hot melt adhesive needs special equipment are solved.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a food-grade water-based adhesive and a preparation method and application thereof.
Background
There are three main types of adhesives used in paper-plastic closures in the market: solvent-based, hot melt adhesive and water emulsion. The industrial use of solvent-based paper-plastic sealing adhesives is mainly attributed to the use of polyolefin adhesives using gasoline as a solvent, two-component polyurethane adhesives using ethyl acetate as a solvent, and rubber adhesives using toluene as a solvent. The solvent-based adhesive has a large amount of solvents (such as benzene, toluene, rosin oil and the like) in the using process, has high toxicity in production and application, can influence the health of operators and cause serious environmental pollution, is inflammable and explosive, is inconvenient to store and transport, and correspondingly increases the use cost. With the stricter and stricter environmental requirements of the country, the adhesive containing the solvent is gradually eliminated, and the water-soluble adhesive taking water as the solvent is used for replacing an organic solvent adhesive and is more and more generally regarded by people.
In recent years, a paper-plastic composite product is a composite material widely applied in modern packaging industry, and is prepared by compounding nonpolar difficultly-bonded materials such as polypropylene (PP), Polyethylene (PE) and other plastic films with polar paper printed matters by using an adhesive, so that the paper-plastic composite product has the performances of moisture resistance, pollution resistance, folding resistance, wear resistance and the like, enhances the use safety of the paper-plastic composite product, prolongs the service life of the paper-plastic composite product, and is widely applied to the fields of art printed matters, packing paper, advertisement calligraphy and painting, book covers and paper boxes for packaging.
The invention mainly aims at the problems in the paper-plastic sealing process of the coated paper surface and the common paper surface in the food packaging box, requires the water-based adhesive which can not only adhere paper and plastic, but also meet the food-grade requirements, and provides the food-grade paper-plastic sealing water-based adhesive with reasonable cost and environmental protection.
Disclosure of Invention
In order to solve the technical problem, the first aspect of the invention provides a food-grade water-based adhesive, which at least comprises the following components in percentage by weight: 60-90% of polymer emulsion, 1-3% of plasticizer, 0.1-2% of defoaming agent, 0.1-5% of surfactant and water for supplementing 100%.
As a preferred technical solution of the present invention, the polymer emulsion is at least one selected from polyisoprene copolymer emulsion, polyacrylate emulsion, acrylic emulsion, polyurethane emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, acrylic emulsion, maleimide emulsion and styrene-butadiene latex.
As a preferable technical scheme of the invention, the high polymer emulsion is a combination of vinyl acetate-ethylene copolymer emulsion and acrylic emulsion, and the weight ratio is 1: (3-7).
As a preferable technical scheme of the invention, the solid content of the vinyl acetate-ethylene copolymer emulsion is not less than 55 wt%.
As a preferred technical proposal of the invention, the dynamic viscosity of the vinyl acetate-ethylene copolymerization emulsion at 25 ℃ is 1000-5000 mpa.s.
As a preferable technical scheme of the invention, the dynamic viscosity of the vinyl acetate-ethylene copolymer emulsion at 25 ℃ is 2500-4000 mpa.s.
In a preferred embodiment of the present invention, the plasticizer is at least one selected from the group consisting of a citrate plasticizer, a benzoate plasticizer, and an epoxy plasticizer.
In a preferred embodiment of the present invention, the defoaming agent is at least one defoaming agent selected from mineral oils, alcohols, fatty acids, fatty acid esters, amides, phosphates, silicones, polyethers, and polyether-modified silicones.
The second aspect of the invention provides a preparation method of the food-grade water-based adhesive, which at least comprises the following steps: adding the polymer emulsion into a reaction kettle, then adding a defoaming agent, and stirring for 20-40min until the mixture is uniformly mixed; then adding plasticizer, surfactant and water, stirring for 30-60min, and discharging.
The third aspect of the invention provides application of the food-grade water-based adhesive in the field of paper-plastic sealing packaging.
Advantageous effects
The invention provides a food-grade water-based adhesive, which meets the food-grade requirements of the American FDA and solves the problems that the common hot melt adhesive has poor adhesion to film and paper, heavy smell of solvent-containing adhesive, no environmental protection and incapability of meeting the food-grade requirements; the glue provided by the invention is a water-based glue, so that the problems that the common hot melt glue has high requirements on operation, needs special equipment and the like are solved.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
In order to solve the technical problem, the first aspect of the invention provides a food-grade water-based adhesive, which at least comprises the following components in percentage by weight: 60-90% of polymer emulsion, 1-3% of plasticizer, 0.1-2% of defoaming agent, 0.1-5% of surfactant and water for supplementing 100%.
In a preferred embodiment, the food-grade water-based adhesive comprises the following components in percentage by weight: 90% of polymer emulsion, 2% of plasticizer, 1% of defoaming agent, 3% of surfactant and the balance of water to 100%.
High molecular emulsion
In the invention, the high molecular emulsion is selected from at least one of polyisoprene copolymer emulsion, polyacrylate emulsion, polyurethane emulsion, acrylic emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, pure acrylic emulsion, maleimide emulsion and butylbenzene latex.
In a preferred technical scheme, the polymer emulsion is a combination of vinyl acetate-ethylene copolymer emulsion and acrylic emulsion, and the weight ratio is 1: (3-7).
In a more preferred embodiment, the polymer emulsion is a combination of vinyl acetate-ethylene copolymer emulsion and acrylic emulsion, and the weight ratio is 1: 5.
vinyl acetate-ethyleneOlefin copolymer emulsion
The vinyl acetate-ethylene copolymer emulsion (EVA for short) is a high molecular emulsion prepared by using vinyl acetate and ethylene monomers as basic raw materials and copolymerizing the vinyl acetate and ethylene monomers with other auxiliary materials by an emulsion polymerization method. The preparation method is mainly applied to the fields of adhesives, heat preservation, water proofing, coatings, glass fibers, papermaking, engineering fabrics, textiles, cement modifiers, paper processing and the like. Wherein the adhesive field is mainly applied to wood bonding, paper bonding, aqueous laminating adhesive and cigarette adhesive. The heat-insulating mortar is applied to the building field, and comprises heat-insulating mortar, waterproof coating, building binder, interface agent and the like.
In the invention, the solid content of the vinyl acetate-ethylene copolymer emulsion is not less than 55 wt%.
In a preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a kinetic viscosity of 1000-.
In a more preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a kinetic viscosity of 2500-.
In a preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a pH of 4 to 5.
In a more preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a pH of 4.5.
In the present invention, the source of the vinyl acetate-ethylene copolymer emulsion is not particularly limited, and the vinyl acetate-ethylene copolymer emulsion is selected from taiwan Dalian chemical, model numbers DA-102, DA-101, etc.; DA-102 is preferred.
Acrylic emulsion
In the invention, the acrylic emulsion is acrylate copolymer emulsion.
In a preferred embodiment, the acrylic emulsion is an anionic acrylic emulsion.
In a preferred embodiment, the Brookfield viscosity of the acrylate copolymer emulsion is 100-.
The test conditions of the Brookfield viscosity are as follows: 25 ℃ and 12 rpm for rotor No. 3.
In a more preferred embodiment, the Brookfield viscosity of the acrylate copolymer emulsion is 200-1000 cps.
In a preferred embodiment, the solids content of the acrylate copolymer emulsion is from 45 to 55% by weight.
In the present invention, the source of the acrylic emulsion is not particularly limited, and there may be mentioned Guangdong Badfish chemical, Germany Basff chemical, Guangdong silver resin Co., Ltd; preferably, it is selected from German Basff chemical, model number Anguli 7676, Guangdong Badfu chemical, model number RS-706T, Guangdong Yinyang resin Co., model number YC-8068, etc.
The inventor finds that the adhesive force of the prepared water-based adhesive to a matrix is obviously improved by reasonably compounding the specially selected vinyl acetate-ethylene copolymer emulsion and the acrylic emulsion, and the prepared water-based adhesive has good affinity and adhesiveness with materials such as BOPP films, PE films, PET films, PVC films and the like. The inventor thinks that the possible reasons are that the main chains of the vinyl acetate-ethylene copolymer and the acrylic ester copolymer have good rotational freedom and certain flexibility, and the molecules are mutually wound and crosslinked to form a network structure, so that the escape of a plasticizer in the using process can be prevented, and the durability and the environmental protection performance of the water-based adhesive are improved; meanwhile, the low-temperature crystallinity among molecules is reduced, the flexibility and the impact resistance of the molecules are further improved, and the bonding strength of the molecules is improved; particularly, when the anionic acrylate emulsion is selected, the emulsion has excellent adhesion to the paper-plastic substrate and high bonding strength due to the similarity of the emulsion and the molecular structure of the paper-plastic substrate and proper viscosity.
Plasticizer
Plasticizers are additives for polymer materials, which are widely used in industrial production, and are also called plasticizers. Any substance added to a polymeric material that increases the plasticity of the polymer is called a plasticizer. The plasticizer can improve the performance of the high polymer material, reduce the production cost and improve the production benefit. The plasticizer is an important chemical product additive, is generally applied to materials such as plastic products, concrete, mud ash, cement, gypsum, cosmetics, cleaning agents and the like as an auxiliary agent, particularly polyvinyl chloride plastic products, and is required to be added with phthalate in order to increase the plasticity of the plastic and improve the strength of the plastic, wherein the content of the phthalate can sometimes reach 50 percent of the product. The plasticizer mainly has the effects of weakening the secondary valence bonds among resin molecules, increasing the mobility of the molecular bonds of the resin, reducing the crystallinity of the resin molecules, increasing the plasticity of the resin molecules, enhancing the flexibility of the resin molecules, being easy to process, being legally applicable to industrial application, and being widely existed in food packaging, cosmetics, medical devices and environmental water.
In the present invention, the plasticizer is at least one selected from the group consisting of a citrate plasticizer, a benzoate plasticizer and an epoxy plasticizer.
As the citrate-based plasticizer, for example, tributyl citrate (TBC), trioctyl citrate (TOC), acetyl tributyl citrate (ATBC), acetyl trioctyl citrate (ATOC), and the like can be mentioned.
As the epoxy plasticizer, epoxidized soybean oil, epoxidized acetyl methyl linoleate, epoxidized butyl furoate, epoxidized butyl pupate oleate, epoxidized octyl soyate oleate, epoxidized octyl 9, 10-epoxystearate and the like can be mentioned.
In a preferred embodiment, the plasticizer is a combination of acetyl trioctyl citrate and epoxy acetyl methyl linoleate.
In a more preferred embodiment, the weight ratio of the trioctyl acetylcitrate to the methyl epoxy-acetyl-linoleate is 1: (0.5-1.2).
In a most preferred embodiment, the weight ratio of the trioctyl acetylcitrate to the epoxy-acetyl-methyl linoleate is 1: 0.8.
defoaming agent
Defoamers are substances that reduce the surface tension of water, solutions, suspensions, etc., prevent the formation of foam, or reduce or eliminate the original foam. The application of the defoaming agent is very wide, such as the food industry, the paper industry, the water treatment industry, the oil extraction industry, the printing and dyeing industry, the coating industry, the detergent industry, the rubber latex industry, the aerosol industry, the daily chemical industry, the medical industry, the dairy industry and the like.
In the invention, the defoaming agent is at least one of mineral oil, alcohols, fatty acids, fatty acid esters, amides, phosphates, silicones, polyethers and polyether modified polysiloxane defoaming agents.
In a preferred embodiment, the defoamer is a polyether modified silicone based defoamer.
In the present invention, the source of the polyether-modified silicone type defoaming agent is not particularly limited, and nakamura assistant ltd, BNK-G409, zhongshan meliken co.
The defoaming agent is formed by connecting and polymerizing a linear dimethyl silicone oil main chain/side chain and a polyether chain, and oxygen atoms in the polyether chain segment in the molecular structure can form hydrogen bonds under the action of water so as to be dissolved in aqueous solution; the polysiloxane segment is neither hydrophilic nor oleophilic, and the hydrocarbyl group on the backbone is also not hydrophilic. Therefore, the polyether chain segment and the polysiloxane chain segment are connected together through a chemical bond generated by hydrosilylation, the surface tension of the polyether chain segment and the polysiloxane chain segment is far lower than that of a liquid film, liquid drops of the defoaming agent can be continuously spread and go deep on the surface of the liquid film, the local liquid film of the foam is continuously thinned, finally, a bridge of oil in the middle of water is formed, the surface tensions of the oil phase and the water phase are far apart, the oil phase is continuously drawn by the surrounding water phase to be elongated and thinned, and after the deformation exceeds a certain range, the liquid film is damaged, so that the foam is broken, and the defoaming. Meanwhile, in the experimental process, the inventor finds that the comprehensive performance of the water-based adhesive is optimal only when the amount of the defoaming agent is 0.1-2%, and the cost and the strength of the water-based adhesive are reduced along with the increase of the content of the defoaming agent.
Surface active agent
Surfactant (surfactant) is a substance added in a small amount to change the interface state of a solution system obviously. Has fixed hydrophilic and lipophilic groups and can be directionally arranged on the surface of the solution. The molecular structure of the surfactant has amphipathy: one end is a hydrophilic group, and the other end is a hydrophobic group; the hydrophilic group is often a polar group, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amino groups and salts thereof, hydroxyl, amide, ether linkages, and the like may also be used as the polar hydrophilic group; and the hydrophobic group is often a non-polar hydrocarbon chain, such as a hydrocarbon chain of 8 or more carbon atoms.
In the present invention, the surfactant is at least one selected from the group consisting of a cationic surfactant, an anionic surfactant and a nonionic surfactant.
In a preferred embodiment, the surfactant is an anionic surfactant.
In a more preferred embodiment, the anionic surfactant is at least one selected from the group consisting of fatty acid salts, sulfonic acid salts, sulfuric acid ester salts, and phosphoric acid ester salts.
In a most preferred embodiment, the surfactant is dioctyl sodium sulfosuccinate.
In the present invention, the source of the dioctyl sodium sulfosuccinate is not particularly limited, and there may be mentioned the company Rodia, model OT-75.
The inventor finds that the addition of the surfactant can obviously improve the permeability and the adhesive force of the water-based adhesive and the smooth plane of the plastic film, and particularly, the adhesive force of the water-based adhesive and the metal foil is optimal when the anionic surfactant dioctyl sodium sulfosuccinate is selected.
Water (W)
In the present invention, the water is not particularly limited, and tap water, deionized water, distilled water and the like can be mentioned.
In a preferred embodiment, the water is deionized water.
The second aspect of the invention provides a preparation method of the food-grade water-based adhesive, which at least comprises the following steps: adding the polymer emulsion into a reaction kettle, then adding a defoaming agent, and stirring for 20-40min until the mixture is uniformly mixed; then adding plasticizer, surfactant and water, stirring for 30-60min, and discharging.
The third aspect of the invention provides application of the food-grade water-based adhesive in the field of paper-plastic sealing packaging.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
Example 1
Embodiment 1 provides a food-grade water-based adhesive, which comprises the following components in percentage by weight: 90% of polymer emulsion, 2% of plasticizer, 1% of defoaming agent, 3% of surfactant and the balance of water to 100%.
The high polymer emulsion is a combination of vinyl acetate-ethylene copolymer emulsion and acrylic emulsion, and the weight ratio is 1: 5; the vinyl acetate-ethylene copolymer emulsion is selected from Taiwan Dalian chemical, model number DA-102; the acrylic emulsion is selected from German Pasteur chemical, model number Anlidi YC-8068.
The plasticizer is a combination of acetyl trioctyl citrate and epoxy acetyl methyl linoleate, and the weight ratio is 1: 0.8.
the defoaming agent is polyether modified polysiloxane defoaming agent selected from Mianshan Milliken auxiliary agent Co., Ltd, BNK-G409.
The surfactant was dioctyl sodium sulfosuccinate, purchased from Rhodia corporation, model OT-75.
The water is deionized water.
The preparation method of the food-grade water-based adhesive at least comprises the following steps: adding the polymer emulsion into a reaction kettle, then adding a defoaming agent, and stirring for 40min until the mixture is uniformly mixed; then adding plasticizer, surfactant and water, stirring for 60min, and discharging.
Example 2
Embodiment 2 provides a food-grade water-based adhesive, which comprises the following components in percentage by weight: 60% of polymer emulsion, 1% of plasticizer, 0.1% of defoaming agent, 0.1% of surfactant and water for supplementing 100%.
The high polymer emulsion is a combination of vinyl acetate-ethylene copolymer emulsion and acrylic emulsion, and the weight ratio is 1: 3; the vinyl acetate-ethylene copolymer emulsion is selected from Taiwan Dalian chemical, model number DA-102; the acrylic emulsion is selected from German Pasteur chemical, model number Anlidi YC-8068.
The plasticizer is a combination of acetyl trioctyl citrate and epoxy acetyl methyl linoleate, and the weight ratio is 1: 0.5.
the defoaming agent is polyether modified polysiloxane defoaming agent selected from Mianshan Milliken auxiliary agent Co., Ltd, BNK-G409.
The surfactant was dioctyl sodium sulfosuccinate, purchased from Rhodia corporation, model OT-75.
The water is deionized water.
The preparation method of the food-grade water-based adhesive at least comprises the following steps: adding the polymer emulsion into a reaction kettle, then adding a defoaming agent, and stirring for 40min until the mixture is uniformly mixed; then adding plasticizer, surfactant and water, stirring for 60min, and discharging.
Example 3
Embodiment 3 provides a food-grade water-based adhesive, which comprises the following components in percentage by weight: 90% of polymer emulsion, 3% of plasticizer, 2% of defoaming agent and 5% of surfactant.
The high polymer emulsion is a combination of vinyl acetate-ethylene copolymer emulsion and acrylic emulsion, and the weight ratio is 1: 7; the vinyl acetate-ethylene copolymer emulsion is selected from Taiwan Dalian chemical, model number DA-102; the acrylic emulsion is selected from German Pasteur chemical, model number Anlidi YC-8068.
The plasticizer is a combination of acetyl trioctyl citrate and epoxy acetyl methyl linoleate, and the weight ratio is 1: 0.2.
the defoaming agent is polyether modified polysiloxane defoaming agent selected from Mianshan Milliken auxiliary agent Co., Ltd, BNK-G409.
The surfactant was dioctyl sodium sulfosuccinate, purchased from Rhodia corporation, model OT-75.
The water is deionized water.
The preparation method of the food-grade water-based adhesive at least comprises the following steps: adding the polymer emulsion into a reaction kettle, then adding a defoaming agent, and stirring for 40min until the mixture is uniformly mixed; then adding plasticizer, surfactant and water, stirring for 60min, and discharging.
Example 4
Example 4 differs from example 1 in that the vinyl acetate-ethylene copolymer emulsion has a kinetic viscosity of 750 + -250 cps at 25 deg.C, as purchased from Kyowa chemical Co., Ltd., Guangzhou under the designation GW-707.
Example 5
Said example 5 differs from example 1 in that no acrylic emulsion is included.
Example 6
Example 6 differs from example 1 in that no surfactant is included.
Example 7
Example 7 differs from example 1 in that the defoamer is a polysiloxane defoamer.
Performance testing
The water-based glues provided in examples 1-7 were used for composite sealing of paper/plastic (BOPP films). The water-based adhesive provided by the embodiment is injected into an adhesive tank, the adhesive solution is uniformly coated on a BOPP film through an adhesive moving roller and an adhesive coating roller, the thickness of the adhesive is 0.02mm, and then the paper and the BOPP film are pressed together through a compression roller (the temperature is 50-60 ℃). After the paper/BOPP film after composite sealing is placed for 24 hours at normal temperature or is placed into a drying room at 50 ℃ to be cured for 15 hours, a T-type peel strength test is carried out according to GB/T2791-1995 'adhesive T peel strength test method flexible material to flexible material'.
The experimental result shows that the paper-plastic sealing compounded by the water-based adhesive in the embodiment 1-3 has intact paper and is not torn;
examples 4-7 water-based glue composite paper-plastic seals, paper was torn and the paper fibres were mostly transferred to BOPP film.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. A food-grade water-based adhesive is characterized by at least comprising the following components in percentage by weight: 60-90% of polymer emulsion, 1-3% of plasticizer, 0.1-2% of defoaming agent, 0.1-5% of surfactant and water for supplementing 100%.
2. A food grade water-based adhesive according to claim 1, wherein the polymer emulsion is selected from at least one of polyisoprene copolymer emulsion, acrylic emulsion, polyacrylate emulsion, polyurethane emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, acrylic emulsion, maleimide emulsion and styrene-butadiene latex.
3. The food-grade water-based adhesive according to claim 1, wherein the polymer emulsion is a combination of a vinyl acetate-ethylene copolymer emulsion and an acrylic acid emulsion, and the weight ratio of the polymer emulsion to the acrylic acid emulsion is 1: (3-7).
4. A food grade water-based adhesive according to claim 3, wherein the vinyl acetate-ethylene copolymer emulsion has a solids content of not less than 55 wt%.
5. A food grade water-based adhesive according to claim 4, wherein the vinyl acetate-ethylene copolymer emulsion has a kinetic viscosity of 1000-5000mpa.s at 25 ℃.
6. A food-grade water-based adhesive according to any one of claims 2 to 5, wherein the dynamic viscosity of the vinyl acetate-ethylene copolymer emulsion at 25 ℃ is 2500-4000 mpa.s.
7. A food grade water-based adhesive according to claim 1, wherein the plasticizer is selected from at least one of citrate plasticizers, benzoate plasticizers, and epoxy plasticizers.
8. The food grade water-based adhesive according to claim 1, wherein the defoaming agent is at least one selected from mineral oil, alcohols, fatty acids, fatty acid esters, amides, phosphates, silicones, polyethers, polyether-modified silicones.
9. A method of preparing a food grade water-based glue according to any of claims 1-8, characterised in that it comprises at least the following steps: adding the polymer emulsion into a reaction kettle, then adding a defoaming agent, and stirring for 20-40min until the mixture is uniformly mixed; then adding plasticizer, surfactant and water, stirring for 30-60min, and discharging.
10. Use of a food grade water-based glue according to any of claims 1-8 in the field of paper-plastic closure packaging.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112160182A (en) * | 2020-09-28 | 2021-01-01 | 岳阳林纸股份有限公司 | Pizza box facial tissue and preparation method thereof |
| CN112760064A (en) * | 2021-01-21 | 2021-05-07 | 英创科技(广州)有限公司 | Water-based adhesive and preparation method and application thereof |
| CN112961639A (en) * | 2021-02-02 | 2021-06-15 | 上海路嘉胶粘剂有限公司 | Water-based hot melt adhesive for medical dialyzing paper sterile packaging bag and preparation process thereof |
| CN113004850A (en) * | 2021-03-31 | 2021-06-22 | 珠海市景晟包装材料有限公司 | Preparation method of water-based sealing adhesive |
| CN115216251A (en) * | 2021-12-26 | 2022-10-21 | 上海路嘉胶粘剂有限公司 | Water-based sealing adhesive and preparation method and application thereof |
-
2020
- 2020-04-29 CN CN202010353452.3A patent/CN111454667A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112160182A (en) * | 2020-09-28 | 2021-01-01 | 岳阳林纸股份有限公司 | Pizza box facial tissue and preparation method thereof |
| CN112760064A (en) * | 2021-01-21 | 2021-05-07 | 英创科技(广州)有限公司 | Water-based adhesive and preparation method and application thereof |
| CN112961639A (en) * | 2021-02-02 | 2021-06-15 | 上海路嘉胶粘剂有限公司 | Water-based hot melt adhesive for medical dialyzing paper sterile packaging bag and preparation process thereof |
| CN112961639B (en) * | 2021-02-02 | 2022-07-26 | 上海路嘉胶粘剂有限公司 | Water-based hot melt adhesive for medical dialyzing paper sterile packaging bag and preparation process thereof |
| CN113004850A (en) * | 2021-03-31 | 2021-06-22 | 珠海市景晟包装材料有限公司 | Preparation method of water-based sealing adhesive |
| CN115216251A (en) * | 2021-12-26 | 2022-10-21 | 上海路嘉胶粘剂有限公司 | Water-based sealing adhesive and preparation method and application thereof |
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