CN112831298A - Preparation method of special high-cost-performance pressure plate adhesive for wooden door - Google Patents

Abstract

The invention discloses a preparation method of a special high-cost-performance pressure plate adhesive for a wooden door. The method prepares the door plate special adhesive with high viscosity and high initial viscosity suitable for the door plate industry by a special synthesis process and a special raw material proportion by adopting a unique preparation mode, the viscosity can reach above 400000Mpa.s, the internal bonding strength reaches above 4.7Mpa, and the adhesive has better initial viscosity and drying speed, so that the pressing time of the door plate is reduced from 9 hours to 5 hours. The adhesive combines an IPN molecular crosslinking technology and a core-shell polymerization process, and adopts lower-cost raw materials and a proper synthesis mode to replace polyvinyl acetate emulsion and vinyl acetate-ethylene copolymer emulsion currently used in the door panel industry. The adhesive can reduce the cost of the pressure plate adhesive used in the current door plate industry from 3000-cost 7000 Yuan/ton to 1600-cost 1800 Yuan/ton, and meanwhile, the production efficiency is improved from cold pressing in 9 hours to cold pressing in 5 hours, so that the utilization rate of equipment is greatly improved, and the adhesive can be applied to all wood door plate pressure plate industries.

Description

Preparation method of special high-cost-performance pressure plate adhesive for wooden door

Technical Field

The invention relates to a preparation method of a high-cost-performance press plate adhesive special for a wooden door, in particular to a preparation method of a high-cost-performance press plate adhesive used in the wooden door industry. The adhesive is special for the wood door industry, has the characteristics of high cost performance, high initial viscosity, rapid drying, low minimum film forming temperature and stable storage, and is particularly suitable for cold pressing and laminating in the wood door industry.

Background

The wood door industry is a rapidly-developing industry, and the amount of adhesive used for pressing and pasting the wood door is increased exponentially from the prior solid wood door mainly to the prior artificial board pressing door mainly. Due to the fact that the heat transfer problem of the core layer of the fiber board and the particle board cannot achieve large thickness, the fiber board and the particle board need to be bonded together through adhesives to form a board with larger thickness. As the pressing production can be carried out only by adopting a cold pressing mode, the adhesive is required to be dried as fast as possible, the utilization rate of a press is improved, the initial viscosity is good, the viscosity is high, the permeation is reduced, and the production cost is reduced by reducing the cost as low as possible.

At present, polyvinyl acetate emulsion (white latex) is mainly adopted in the industry to produce, the white latex can meet the requirements on strength and initial viscosity, but the high-viscosity white latex products for the wood door industry are fewer, and more importantly, the price is higher, for example, the best roof white latex and the Huabiao white latex in the industry are about 6000 yuan/ton, and the low-price white latex has low curing amount, so that the initial viscosity is low, and the drying speed is slow, and the wood door industry cannot be used. The market also has many imitative white latex products, mainly is the mixture of polyvinyl formal product and starch, and the problem that exists is that the shelf life is short, and starch material can take place to regenerate the condition and cause the gluing agent layering skinning, loses initial viscidity mainly. Secondly, the strength and the initial viscosity are poor, the cost is reduced by generally adopting a large amount of filler, the product quality is unstable, the door plate cracks in rainy days often, the initial viscosity is too low, normal production cannot be carried out, and the filler is only used in a small amount in some low-end door plants. Meanwhile, the white latex imitation product has poor thixotropy and wettability, the viscosity of the adhesive is high during sizing, so that sizing is difficult, and the adhesive is not good and is not infiltrated by the board.

This patent is directed against the directional development of the pain point of present timber trade, adopts the mode of nucleocapsid polymerization to regard soft monomer and just viscidity reinforcing agent as the casing, places hard monomer inside as the core body in, can so make intensity and just viscidity reach and compromise. The method abandons a method of simply adding starch to reduce the cost and thicken, adopts special polyhydroxy substances to react with substances such as formaldehyde and the like, and then reacts with wet strength agent substances introduced on the shell to form an IPN interpenetrating network structure, thereby avoiding the occurrence of the condition similar to starch retrogradation, placing layering and greatly reducing the dosage of the primary viscosity reinforcing agent. This patent has adopted unique nucleocapsid structure, the abundant interact of having considered different monomers and other additives for interior bonding strength and each item performance are fit for the timber trade more. Solid content of the adhesive reaches 35% through a reasonable synthesis process, viscosity reaches 450000Mpa.s, so that the adhesive can be dried faster under the condition of stable storage, the adhesive can be stored stably for 6 months, slight yellowing of the surface layer occurs after 6 months, the using effect is not affected after the adhesive is uniformly stirred, and all indexes of the adhesive can reach the standard within one year after storage.

Disclosure of Invention

The invention mainly aims to solve the problem that no adhesive with high cost performance exists in the existing wood door industry, and provides a preparation method of the adhesive with high cost performance for artificial board cold pressing adhesion in the wood door industry.

The conventional market selects few types of white latex commonly used in the wood door industry, so that enterprises cannot bear the white latex, and the imitated white latex is low in price but does not meet market requirements in storage and performance stability in all aspects, so that production faults and customer quality problem claim money are often caused.

The principle of the invention is that proper monomers are reasonably distributed and subjected to core-shell copolymerization, and related active groups are introduced into a copolymerized shell layer, so that an IPN (interpenetrating Polymer network) cross-linked structure can be formed by the added polyhydroxy substances and the polyhydroxy substances, and the polyhydroxy substances are locked together to avoid the phenomena of gel and cluster caused by the aggregation of hydroxyl groups. The structure further reduces the adding amount of the initial viscosity reinforcing agent, and can enable cheaper polyhydroxy substances to fully play a role. The balance is made between the storage stability and the high viscosity, and the proper additive is selected to ensure that the adhesive can keep the stable storage of the viscosity and the production cannot be influenced by the thixotropy.

The purpose of the invention is realized by the following technical scheme:

a preparation method of a special high-cost-performance press plate adhesive for a wooden door is characterized by comprising the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 80-90 ℃, adding a polyhydroxy substance, keeping the temperature for dissolving for 30-120 min, wherein the solution is in a light yellow semitransparent state after the dissolving is finished, and the adding amount of the polyhydroxy substance accounts for 5-10% of the mass fraction of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% of formaldehyde and an emulsifier into the reaction container in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH value to 2-6, and keeping the temperature at 70-90 ℃ for reacting for 1-2 hours, wherein the formaldehyde solution accounts for 25-30% of the mass of water, and the emulsifier accounts for 1-5% of the mass of water;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, emulsifier and dispersant to carry out emulsification, wherein the emulsification rotation speed is 1000-7000r, and the time is 1-30 min. Then adding a needed chain initiator and a needed pH regulator to control the pH value to be 8-12, keeping the reaction temperature to be 30-100 ℃, and keeping the temperature for 10-180 min to complete seed emulsion polymerization, wherein the vinyl acetate monomer accounts for 2-10% of the mass of water, the methyl methacrylate monomer accounts for 1-3% of the mass of water, the emulsifier accounts for 0.01-0.5% of the mass of water, the dispersant accounts for 0.01-0.5% of the mass of water, and the initiator accounts for 0.01-0.1% of the mass of water;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of initial viscosity reinforcing agent and wet strength agent into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of emulsifying agent and dispersing agent, stirring in a single emulsifying machine at the rotation speed of 1000-7000r for 1-30 min, wherein the initial viscosity reinforcing agent accounts for 1-5% of the mass of water, the wet strength agent accounts for 1-6% of the mass of water, the vinyl acetate monomer accounts for 5-20% of the mass of water, the acrylic acid monomer accounts for 1-10% of the mass of water, the butyl acrylate monomer accounts for 1-3% of the mass of water, the acrylamide monomer accounts for 1-3% of the mass of water, the emulsifying agent accounts for 0.01-0.5% of the mass of water, and the dispersing agent accounts for 0.01-0.5% of the mass of water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip off within 4 hours, cooling to 70-80 ℃, preserving heat for 1-3 hours, adding a certain amount of urea, thickening agent and filler, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the special high-cost-performance press plate glue for the wood door.

2. The method for preparing the special high-cost-performance wood door platen glue according to claim 1, wherein the polyhydroxy substance in (1) is one of soybean meal, oxidized starch, carboxymethyl starch and guar gum.

3. The method for preparing the special high-cost-performance wood door press plate adhesive according to claim 1, wherein the emulsifier in (2) is one of OP-10, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, polyvinyl alcohol and Tween 80.

4. The method for preparing the special high-cost-performance laminated adhesive for the wooden door according to claim 1, wherein the emulsifier in (3) and (4) is one of OP-10, N-dodecyl dimethylamine and sodium stearate, the dispersant is one of sodium hexametaphosphate, sodium polyacrylate and sodium carboxymethyl cellulose, the chain initiator is one of ammonium persulfate, potassium persulfate, dibenzoyl peroxide and di-tert-butyl hydroperoxide, and the pH regulator is one of sodium hydroxide, triethanolamine and hexamethylenetetramine.

5. The method for preparing the special high-cost-performance laminated adhesive for the wooden door according to claim 1, wherein the initial viscosity enhancer in the step (4) is one or a mixture of urea formaldehyde resin, C9 petroleum resin, modified rosin, terpene resin, cyclodextrin and modified epoxidized soybean oil, and the wet strength agent is one of modified phenolic resin, polyamide polyamine epichlorohydrin resin and modified urea formaldehyde resin.

6. The preparation method of the special high-cost-performance wood door platen glue according to claim 1, characterized in that the urea accounts for 1% -3% of the water by mass, the thickener is one of guar gum, hydroxypropyl methylcellulose, carboxymethyl starch and neutral acrylic acid thickener, accounts for 1% -3% of the water by mass, the filler is one of light calcium carbonate, montmorillonite and talcum powder, accounts for 1% -10% of the water by mass, and the mesh number is more than 1500 meshes.

Compared with the prior art, the invention has the following advantages:

1. the preparation method of the special high-cost-performance press plate adhesive for the wood door has the advantages that the initial viscosity is high, the internal bonding strength is greater than 5Mpa, the viscosity reaches 450000Mpa, the storage period reaches 6 months, and cold pressing and drying can be completed within 5 hours.

2. The cost of the special high-cost-performance pressure plate adhesive for the wooden door is as low as 1800 plus 2000 yuan/ton, is lower than that of white latex (3000 plus 7000 yuan/ton) commonly used in the market, has higher quality stability and operation convenience than that of low-end imitated white latex, and does not generate harsh formaldehyde taste to influence the health of workers.

Detailed Description

In order to further understand the present invention, the following examples are further provided to illustrate the present invention, and it should be noted that the scope of the present invention is not limited to the examples.

In the following examples, the internal bond strength test was performed according to the national standard EN 319-11995; the viscosity test adopts HGB 4061-1960 national standard test, and the test tool is an NDJ-1 rotational viscometer; the initial viscosity test of the solid content test adopts GB-T2793-1995 national standard test and the existing production line production of factories, and the customer acceptance is the main.

Example 1

A preparation method of a special high-cost-performance press plate adhesive for a wooden door comprises the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 80 ℃, adding guar gum, keeping the temperature for dissolving for 120min, and after the dissolution is finished, enabling the solution to be in a light yellow semitransparent state, wherein the adding amount of the guar gum accounts for 10% of the mass fraction of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% formaldehyde and sodium dodecyl benzene sulfonate into the reaction container in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH value to 6, keeping the temperature at 90 ℃ and reacting for 2 hours, wherein the mass fraction of the formaldehyde solution in water is 30%, and the mass fraction of the sodium dodecyl benzene sulfonate in water is 5%;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, OP-10 and sodium hexametaphosphate to emulsify at the emulsifying rotation speed of 1000r for 0 min. Then adding required ammonium persulfate and sodium hydroxide to control the pH value to be 8, keeping the reaction temperature at 70 ℃, and finishing the seed emulsion polymerization after keeping the temperature for 80min, wherein the vinyl acetate monomer accounts for 7% of the water by mass, the methyl methacrylate monomer accounts for 3% of the water by mass, the OP-10 accounts for 0.5% of the water by mass, the sodium hexametaphosphate accounts for 0.01% of the water by mass, and the ammonium persulfate accounts for 0.1% of the water by mass;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of urea-formaldehyde resin and modified phenolic resin into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of N-dodecyl dimethylamine and sodium polyacrylate, stirring in a single emulsifying machine at a rotating speed of 3000r for 30min, wherein the urea-formaldehyde resin accounts for 5% of the water, the modified phenolic resin accounts for 1-6% of the water, the vinyl acetate monomer accounts for 5% of the water, the acrylic acid monomer accounts for 4% of the water, the butyl acrylate monomer accounts for 1% of the water, the acrylamide monomer accounts for 3%, the N-dodecyl dimethylamine accounts for 0.5% of the water, and the sodium polyacrylate accounts for 0.01% of the water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip off after 4 hours, cooling to 70 ℃, preserving heat for 1 hour, adding a certain amount of urea, carboxymethyl starch and light calcium carbonate, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the special high-cost-performance press plate glue for the wood door. The mass fraction of urea in water is 1%, the mass fraction of carboxymethyl starch in water is 1%, the mass fraction of light calcium carbonate in water is 10%, and the mesh number is more than 1500 meshes.

The relevant technical index parameters of the adhesive obtained after mechanical coating in a factory are shown in the following table 1

TABLE 1 related technical indices of adhesives

Example 2

A preparation method of a special high-cost-performance press plate adhesive for a wooden door comprises the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 90 ℃, adding guar gum, keeping the temperature for dissolving for 30min, and enabling the solution to be in a light yellow semitransparent state after the dissolution is finished, wherein the addition amount of the guar gum accounts for 5% of the mass of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% formaldehyde and polyvinyl alcohol into the reaction container in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH to 4, keeping the temperature at 70 ℃ and reacting for 2 hours, wherein the mass fraction of the formaldehyde solution in water is 30%, and the mass fraction of the OP-10 and the polyvinyl alcohol in water is 3%;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, sodium stearate and sodium carboxymethyl cellulose for emulsification at the emulsification rotation speed of 1000r for 30 min. Then adding needed dibenzoyl peroxide and triethanolamine to control the pH value to be 8, keeping the reaction temperature at 90 ℃, keeping the temperature for 50min, and finishing seed emulsion polymerization, wherein the vinyl acetate monomer accounts for 4% of the mass of water, the methyl methacrylate monomer accounts for 3% of the mass of water, the sodium stearate accounts for 0.5% of the mass of water, the sodium carboxymethylcellulose accounts for 0.5% of the mass of water, and the dibenzoyl peroxide accounts for 0.1% of the mass of water;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of C9 petroleum resin and polyamide polyamine epichlorohydrin resin into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of sodium stearate and sodium polyacrylate, stirring in a separate emulsifying machine at the rotating speed of 1000r for 30min, wherein the C9 petroleum resin accounts for 3 mass percent of water, the polyamide polyamine epichlorohydrin resin accounts for 3 mass percent of water, the vinyl acetate monomer accounts for 7 mass percent of water, the acrylic acid monomer accounts for 4 mass percent of water, the butyl acrylate monomer accounts for 3 mass percent of water, the acrylamide monomer accounts for 3 mass percent of water, the sodium stearate accounts for 0.1 mass percent of water, and the sodium polyacrylate accounts for 0.1 mass percent of water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip off after 4 hours, cooling to 70 ℃, preserving heat for 1 hour, adding a certain amount of urea, hydroxypropyl methylcellulose and light calcium carbonate, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the high-cost-performance press glue special for the wooden door. The mass fraction of urea in water is 3%, the mass fraction of hydroxypropyl methylcellulose in water is 3%, the mass fraction of light calcium carbonate in water is 2%, and the mesh number is more than 1500 meshes.

Example 3

A preparation method of a special high-cost-performance press plate adhesive for a wooden door comprises the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 85 ℃, then adding the bean pulp, keeping the temperature for dissolving for 30min, wherein the solution is in a light yellow semitransparent state after the dissolution is finished, and the adding amount of the bean pulp accounts for 10 percent of the mass of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% formaldehyde and tween 80 into the reaction vessel in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH value to 5, keeping the temperature at 70 ℃ and reacting for 2 hours, wherein the mass fraction of the formaldehyde solution in water is 30%, and the mass fraction of the tween 80 in water is 3%;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, OP-10 and sodium carboxymethylcellulose for emulsification at the emulsification rotation speed of 1000r for 30 min. Then adding required di-tert-butyl hydroperoxide and hexamethylenetetramine to control the PH value to be 12, keeping the reaction temperature to be 80 ℃, and keeping the temperature for 80min to finish the seed emulsion polymerization, wherein the vinyl acetate monomer accounts for 10 mass percent of water, the methyl methacrylate monomer accounts for 3 mass percent of water, the OP-10 accounts for 0.2 mass percent of water, the sodium carboxymethyl cellulose accounts for 0.5 mass percent of water, and the di-tert-butyl hydroperoxide accounts for 0.1 mass percent of water;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of modified rosin and modified urea-formaldehyde resin into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of sodium stearate and sodium carboxymethylcellulose, stirring in a single emulsifying machine at the rotating speed of 1000r for 30min, wherein the modified rosin accounts for 3 mass percent of water, the modified urea-formaldehyde resin accounts for 3 mass percent of water, the vinyl acetate monomer accounts for 5 mass percent of water, the acrylic acid monomer accounts for 5 mass percent of water, the butyl acrylate monomer accounts for 3 mass percent of water, the acrylamide monomer accounts for 2 mass percent of water, the sodium stearate accounts for 0.5 mass percent of water, and the sodium carboxymethylcellulose accounts for 0.5 mass percent of water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip off after 4 hours, cooling to 75 ℃, preserving heat for 2 hours, adding a certain amount of urea, carboxymethyl starch and montmorillonite, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the special wood door high-cost-performance press plate glue. The mass fraction of urea in water is 3%, the mass fraction of carboxymethyl starch in water is 3%, the mass fraction of montmorillonite in water is 10%, and the mesh number is more than 1500 meshes.

Example 4

A preparation method of a special high-cost-performance press plate adhesive for a wooden door comprises the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 90 ℃, adding guar gum, keeping the temperature for dissolving for 120min, and after the dissolution is finished, enabling the solution to be in a light yellow semitransparent state, wherein the addition amount of the guar gum accounts for 7% of the mass of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% formaldehyde and sodium dodecyl sulfate into the reaction container in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH value to 6, and reacting for 1 hour at the temperature of 90 ℃, wherein the mass fraction of the formaldehyde solution in water is 25%, and the mass fraction of the sodium dodecyl sulfate in water is 3%;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, OP-10 and sodium hexametaphosphate to emulsify at the emulsifying rotation speed of 1000r for 30 min. Then adding required ammonium persulfate and hexamethylenetetramine to control the pH value to be 9, keeping the reaction temperature at 90 ℃, and keeping the temperature for 80min to complete seed emulsion polymerization, wherein the vinyl acetate monomer accounts for 6% of the water by mass, the methyl methacrylate monomer accounts for 3% of the water by mass, the OP-10 accounts for 0.01% -0.5% of the water by mass, the sodium hexametaphosphate accounts for 0.01% of the water by mass, and the ammonium persulfate accounts for 0.1% of the water by mass;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of terpene resin and modified urea-formaldehyde resin into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of sodium stearate and sodium carboxymethylcellulose, stirring in a single emulsifying machine at the rotating speed of 1000r for 20min, wherein the terpene resin accounts for 5 mass percent of water, the modified urea-formaldehyde resin accounts for 6 mass percent of water, the vinyl acetate monomer accounts for 5 mass percent of water, the acrylic acid monomer accounts for 10 mass percent of water, the butyl acrylate monomer accounts for 1 mass percent of water, the acrylamide monomer accounts for 3 mass percent of water, the sodium stearate accounts for 0.5 mass percent of water, and the sodium carboxymethylcellulose accounts for 0.5 mass percent of water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip for 4 hours, cooling to 80 ℃, preserving heat for 3 hours, adding a certain amount of urea, a neutral acrylic acid thickener and talcum powder, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the special high-cost-performance press plate glue for the wood door. The mass fraction of the urea in the water is 2%, the mass fraction of the neutral acrylic thickener in the water is 2%, the mass fraction of the talcum powder in the water is 10%, and the mesh number is more than 1500 meshes.

Example 5

A preparation method of a special high-cost-performance press plate adhesive for a wooden door comprises the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 90 ℃, adding oxidized starch, keeping the temperature for dissolving for 120min, wherein the solution is in a light yellow semitransparent state after the dissolution is finished, and the added amount of the oxidized starch accounts for 5% of the mass fraction of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% formaldehyde and sodium dodecyl sulfate into the reaction container in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH value to 6, and reacting for 1 hour at the temperature of 90 ℃, wherein the mass fraction of the formaldehyde solution in water is 25%, and the mass fraction of the sodium dodecyl sulfate in water is 3%;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, OP-10 and sodium carboxymethylcellulose for emulsification at the emulsification rotation speed of 1000r for 30 min. Then adding required di-tert-butyl hydroperoxide and hexamethylenetetramine to control the PH value to be 12, keeping the reaction temperature to be 80 ℃, and keeping the temperature for 80min to finish the seed emulsion polymerization, wherein the vinyl acetate monomer accounts for 10 mass percent of water, the methyl methacrylate monomer accounts for 3 mass percent of water, the OP-10 accounts for 0.2 mass percent of water, the sodium carboxymethyl cellulose accounts for 0.5 mass percent of water, and the di-tert-butyl hydroperoxide accounts for 0.1 mass percent of water;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of C9 petroleum resin and polyamide polyamine epichlorohydrin resin into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of sodium stearate and sodium polyacrylate, stirring in a separate emulsifying machine at the rotating speed of 1000r for 30min, wherein the C9 petroleum resin accounts for 3 mass percent of water, the polyamide polyamine epichlorohydrin resin accounts for 3 mass percent of water, the vinyl acetate monomer accounts for 7 mass percent of water, the acrylic acid monomer accounts for 4 mass percent of water, the butyl acrylate monomer accounts for 3 mass percent of water, the acrylamide monomer accounts for 3 mass percent of water, the sodium stearate accounts for 0.1 mass percent of water, and the sodium polyacrylate accounts for 0.1 mass percent of water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip off after 4 hours, cooling to 70 ℃, preserving heat for 1 hour, adding a certain amount of urea, hydroxypropyl methylcellulose and light calcium carbonate, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the high-cost-performance press glue special for the wooden door. The mass fraction of urea in water is 3%, the mass fraction of hydroxypropyl methylcellulose in water is 3%, the mass fraction of light calcium carbonate in water is 2%, and the mesh number is more than 1500 meshes.

Claims (6)

1. A preparation method of a special high-cost-performance press plate adhesive for a wooden door is characterized by comprising the following steps and process conditions:

(1) dissolution of the polyhydroxy material: heating 300L of water in a reaction kettle to 80-90 ℃, adding a polyhydroxy substance, keeping the temperature for dissolving for 30-120 min, wherein the solution is in a light yellow semitransparent state after the dissolving is finished, and the adding amount of the polyhydroxy substance accounts for 5-10% of the mass fraction of the water.

(2) Carboxymethylation modification: adding a certain amount of 37% of formaldehyde and an emulsifier into the reaction container in the step (1), opening the reaction kettle for emulsifying and dispersing for 5 minutes, then adding a certain amount of hydrochloric acid to adjust the pH value to 2-6, and keeping the temperature at 70-90 ℃ for reacting for 1-2 hours, wherein the formaldehyde solution accounts for 25-30% of the mass of water, and the emulsifier accounts for 1-5% of the mass of water;

(3) preparation of pre-nucleated emulsion: and (3) adding sodium hydroxide to regulate the pH value to be neutral in the step (2), and adding a certain amount of vinyl acetate monomer, methyl methacrylate monomer, emulsifier and dispersant to carry out emulsification, wherein the emulsification rotation speed is 1000-7000r, and the time is 1-30 min. Then adding a needed chain initiator and a needed pH regulator to control the pH value to be 8-12, keeping the reaction temperature to be 30-100 ℃, and keeping the temperature for 10-180 min to complete seed emulsion polymerization, wherein the vinyl acetate monomer accounts for 2-10% of the mass of water, the methyl methacrylate monomer accounts for 1-3% of the mass of water, the emulsifier accounts for 0.01-0.5% of the mass of water, the dispersant accounts for 0.01-0.5% of the mass of water, and the initiator accounts for 0.01-0.1% of the mass of water;

(4) preparation of the pre-shell emulsion: dissolving a certain amount of initial viscosity reinforcing agent and wet strength agent into vinyl acetate, acrylic acid, butyl acrylate and acrylamide in advance, adding a proper amount of emulsifying agent and dispersing agent, stirring in a single emulsifying machine at the rotation speed of 1000-7000r for 1-30 min, wherein the initial viscosity reinforcing agent accounts for 1-5% of the mass of water, the wet strength agent accounts for 1-6% of the mass of water, the vinyl acetate monomer accounts for 5-20% of the mass of water, the acrylic acid monomer accounts for 1-10% of the mass of water, the butyl acrylate monomer accounts for 1-3% of the mass of water, the acrylamide monomer accounts for 1-3% of the mass of water, the emulsifying agent accounts for 0.01-0.5% of the mass of water, and the dispersing agent accounts for 0.01-0.5% of the mass of water;

(5) forming an emulsion core-shell structure: and (3) dripping the liquid in the step (4) into the solution in the step (3) in a constant flow pump titration mode, controlling the constant flow pump to drip off within 4 hours, cooling to 70-80 ℃, preserving heat for 1-3 hours, adding a certain amount of urea, thickening agent and filler, stirring uniformly, adjusting the glue solution to be neutral, and cooling to obtain the special high-cost-performance press plate glue for the wood door.

2. The method for preparing the special high-cost-performance wood door platen glue according to claim 1, wherein the polyhydroxy substance in (1) is one of soybean meal, oxidized starch, carboxymethyl starch and guar gum.

3. The method for preparing the special high-cost-performance wood door press plate adhesive according to claim 1, wherein the emulsifier in (2) is one of OP-10, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, polyvinyl alcohol and Tween 80.

4. The method for preparing the special high-cost-performance laminated adhesive for the wooden door according to claim 1, wherein the emulsifier in (3) and (4) is one of OP-10, N-dodecyl dimethylamine and sodium stearate, the dispersant is one of sodium hexametaphosphate, sodium polyacrylate and sodium carboxymethyl cellulose, the chain initiator is one of ammonium persulfate, potassium persulfate, dibenzoyl peroxide and di-tert-butyl hydroperoxide, and the pH regulator is one of sodium hydroxide, triethanolamine and hexamethylenetetramine.

5. The method for preparing the special high-cost-performance laminated adhesive for the wooden door according to claim 1, wherein the initial viscosity enhancer in the step (4) is one or a mixture of urea formaldehyde resin, C9 petroleum resin, modified rosin, terpene resin, cyclodextrin and modified epoxidized soybean oil, and the wet strength agent is one of modified phenolic resin, polyamide polyamine epichlorohydrin resin and modified urea formaldehyde resin.

6. The preparation method of the special high-cost-performance wood door platen glue according to claim 1, characterized in that the urea accounts for 1% -3% of the water by mass, the thickener is one of guar gum, hydroxypropyl methylcellulose, carboxymethyl starch and neutral acrylic acid thickener, accounts for 1% -3% of the water by mass, the filler is one of light calcium carbonate, montmorillonite and talcum powder, accounts for 1% -10% of the water by mass, and the mesh number is more than 1500 meshes.