阅读说明：本技术 一种铝木异质复合科技木 (Aluminum-wood heterogeneous composite technical wood ) 是由 卓艳 卓凯 程明娟 杨楠 陈凯 沈煜燕 徐应林 吴云刚 李国忠 于 2019-11-25 设计创作，主要内容包括：本发明涉及一种科技木,尤其涉及一种铝木异质复合科技木。它依次包括阿尤斯单板层、一组以上第二坯板层和阿尤斯单板层；第二坯板层由第一坯板层、铝板与第一坯板层复合加压胶合而成；第一坯板层为一层以上阿尤斯单板重组而成。制备方法包括以下步骤：(1)将1层以上阿尤斯单板通过涂布第一胶粘剂重组制得第一坯板层；(2)将两层坯板A单面涂布第二胶粘剂,与经过预处理的铝板复合加压胶合制得第二坯板层；(3)将第二坯板层与涂布第三胶粘剂的阿尤斯单板复合重组,加压,养生,制得铝木异质复合科技木木方；(4)刨切。本发明铝木异质复合科技木不易开裂、稳定性好、具有金属光泽装饰效果。(The invention relates to a technical wood, in particular to an aluminum-wood heterogeneous composite technical wood. The laminated veneer comprises an Alys veneer layer, more than one group of second blank plate layers and an Alys veneer layer in sequence; the second blank plate layer is formed by compounding, pressurizing and gluing the first blank plate layer, the aluminum plate and the first blank plate layer; the first blank plate layer is formed by recombining more than one layer of Alus veneers. The preparation method comprises the following steps: (1) coating a first adhesive on more than 1 layer of the Alus veneers to prepare a first blank plate layer through recombination; (2) coating a second adhesive on one surface of the two blank plates A, and compounding, pressurizing and gluing the two blank plates A with a pretreated aluminum plate to obtain a second blank plate layer; (3) compounding and recombining the second blank plate layer and the Aleisi veneer coated with the third adhesive, pressurizing, and maintaining to obtain an aluminum-wood heterogeneous composite technical wood beam; (4) and (6) slicing. The aluminum-wood heterogeneous composite technical wood is not easy to crack, has good stability and has a metal luster decorative effect.)

1. The utility model provides an aluminum-wood heterogeneous compound technology wood which characterized in that: the laminated veneer comprises an Alys veneer layer, more than one group of second blank plate layers and an Alys veneer layer in sequence;

the second blank plate layer is formed by compounding, pressurizing and gluing the first blank plate layer, the aluminum plate and the first blank plate layer;

the first blank plate layer is formed by recombining more than one layer of Alys veneers;

a first adhesive layer is arranged between the Aleisi veneers of the first blank layer;

a second adhesive layer is arranged between the first blank plate layer and the aluminum plate;

and a third adhesive layer is arranged between the second blank plate layer and the Alys veneer layer.

2. The aluminum-wood heterogeneous composite engineered wood of claim 1, wherein: the first blank layer comprises 1-10 layers of a ewis veneer.

3. The aluminum-wood heterogeneous composite engineered wood of claim 2, wherein: the thickness of the Alews veneer is less than 0.7mm, and the thickness of the first blank plate layer is less than 7 mm.

4. The aluminum-wood heterogeneous composite engineered wood of claim 3, wherein: the first adhesive layer is an aqueous polymer-isocyanate adhesive or a prepressing formaldehyde-free soy protein adhesive.

5. The aluminum-wood heterogeneous composite engineered wood of claim 4, wherein: the prepressing aldehyde-free soy protein adhesive comprises the following raw materials in parts by weight: 20-50 parts of soybean protein powder, 55-75 parts of water, 2-6 parts of cross-linking agent and 0.01-5 parts of reinforcing agent.

6. The aluminum-wood heterogeneous composite engineered wood of claim 5, wherein: the prepressing formaldehyde-free soy protein adhesive is based on low-temperature precured prepressing soy protein adhesive and comprises the following raw materials in parts by weight: 20-50 parts of soybean protein powder, 55-75 parts of water, 2-6 parts of polyamide epoxy compound, 3-10 parts of low-temperature film-forming emulsion and 0.01-5 parts of triazine ring group high-reactivity polyfunctional epoxy compound.

7. The aluminum-wood heterogeneous composite engineered wood of claim 6, wherein: the prepressing aldehyde-free soy protein adhesive is a prepressing aldehyde-free soy protein adhesive based on a gel system, and comprises the following raw materials in parts by weight: 20-50 parts of soybean protein powder, 55-75 parts of water, 2-6 parts of cationic epoxy compound and 0.01-5 parts of anion soluble hyperbranched long-chain high-molecular compound.

8. An aluminum-wood heterogeneous composite engineered wood according to any one of claims 1 to 7, wherein: the preparation method of the aluminum-wood heterogeneous composite technical wood comprises the following steps:

(1) coating a first adhesive on more than 1 layer of the Alus veneers to prepare a first blank plate layer through recombination;

(2) coating a second adhesive on one surface of the two blank plates A, and compounding, pressurizing and gluing the two blank plates A with a pretreated aluminum plate to obtain a second blank plate layer;

(3) compounding and recombining the second blank plate layer and the AlUS veneer coated with the third adhesive, pressurizing, and preserving to prepare an AlUS veneer and aluminum veneer heterogeneous composite technical wood beam;

(4) and slicing the obtained aluminum-wood heterogeneous composite technical wood batten to obtain the aluminum-wood heterogeneous composite technical wood board with the required specification.

9. The aluminum-wood heterogeneous composite engineered wood of claim 8, wherein: and (3) carrying out pretreatment steps of degreasing the surface of the aluminum plate by alkali liquor and neutralizing the surface of the aluminum plate by acid liquor in the step (2).

10. The aluminum-wood heterogeneous composite engineered wood of claim 9, wherein: the slicing in the step (4) comprises: selecting a high-strength titanium alloy planing cutter, and planing and cutting the wood beam at an included angle of 55-65 degrees between the advancing direction of the planing cutter and the long edge of the wood beam.

Technical Field

The invention relates to a technical wood, in particular to an aluminum-wood heterogeneous composite technical wood.

Background

Along with the rapid atrophy of original forests in the world, the export threshold of logs is improved in most countries of traditional wood output, natural forest protection engineering is also implemented in China, the contradiction between supply and demand of natural precious wood is increasingly prominent, and the healthy development of industries such as building decoration, furniture decoration and the like is severely restricted. Under the background, technical wood (the name of science and technology: recombined decorative wood) is rapidly developed, and the technical wood (the name of science and technology: recombined decorative wood) is a wood decorative material which is manufactured by using single boards of common tree species wood as main raw materials and adopting the technologies of single board color mixing, lamination, mould pressing glue synthesis and the like and has the characteristics of texture, patterns, colors and the like of natural precious tree species wood. However, as consumers for interior decoration become younger, the consumption level and the individual demand are continuously increased, and the conventional technical wood products cannot meet the current aesthetic requirements.

The research on the technical wood in China starts from the Shanghai of the 80 th of the 20 th century, starts relatively late, and the systematic research on the heterogeneous composite technical wood is not developed in China at present, so that the technical wood in China is at the low end of the industry.

Disclosure of Invention

The invention aims to provide an aluminum-wood heterogeneous composite technical wood which is not easy to crack, has good stability and has a metal luster decorative effect.

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

an aluminum-wood heterogeneous composite technical wood sequentially comprises an Alys veneer layer, more than one group of second blank plate layers and the Alys veneer layer;

the second blank plate layer is formed by compounding, pressurizing and gluing the first blank plate layer, the aluminum plate and the first blank plate layer;

the first blank plate layer is formed by recombining more than one layer of Alys veneers;

a first adhesive layer is arranged between the Aleisi veneers of the first blank layer;

a second adhesive layer is arranged between the first blank plate layer and the aluminum plate;

and a third adhesive layer is arranged between the second blank plate layer and the Alys veneer layer.

According to the invention, the composite recombined technical wood with the special luster decorative effect is prepared by compositely laminating the wood and the metal material, the rigidity and toughness of the product are improved, the product is not easy to crack, the stability is good, the metal luster decorative effect is realized, and the diversified consumption requirements can be met.

Preferably, the first blank layer comprises 1-10 layers of auves veneer.

More preferably, the first blank layer comprises 3 layers of auves veneer.

Preferably, the thickness of the Alews veneer is less than 0.7mm, and the thickness of the first blank plate layer is less than 7 mm.

Preferably, the first adhesive layer, the second adhesive layer, or the third adhesive layer are different in composition.

More preferably, the first adhesive layer is an aqueous polymer-isocyanate adhesive or a prepressing aldehyde-free soy protein adhesive.

More preferably, the second adhesive layer is a polyurethane adhesive layer.

More preferably, the third adhesive layer is a urea-formaldehyde resin adhesive layer.

Further preferably, the prepressing aldehyde-free soy protein adhesive comprises the following raw materials in parts by weight: 20-50 parts of soybean protein powder, 55-75 parts of water, 2-6 parts of cross-linking agent and 0.01-5 parts of reinforcing agent.

The soybean protein adhesive has important influence on the prepressurity of the adhesive in the protein permeation and curing processes, the soybean protein adhesive has good effect on the microcosmic dynamic permeation of the single plates, and the water contents of different single plates can adapt to the permeation and adhesive layer distribution of the soybean protein adhesive. The adhesive is used for forming the Alus veneers with the water content of 30% within 2 hours; forming the Alyosi veneer with the water content of 25% for 1 hour; shaping the Aluss veneer with the water content of below 20 percent within 0.5 hour. The soybean protein adhesive disclosed by the invention is detected, and free formaldehyde is detected; the content of free phenol is less than or equal to 0.2 percent; the total volatile organic compounds are less than or equal to 100g/L (meeting the highest requirement of GB18583-2008 'Limited amount of harmful substances in adhesive for interior decoration and finishing materials').

Preferably, the soybean protein is soybean meal powder with the protein content of 58-65%.

Preferably, the crosslinking agent is a polyamide-based epoxy compound or a cationic epoxy compound.

Preferably, the reinforcing agent is a triazine ring group high-reactivity polyfunctional epoxy compound or an anion soluble hyperbranched long-chain polymer compound.

According to the invention, a triazine ring group high-reactivity multifunctional epoxy compound containing double-bond functional groups is used for carrying out an enhanced reaction on soybean protein, and a polyamide epoxy compound containing amido functional groups is used as a crosslinking point, so that the low-temperature pre-cured prepressing soybean protein adhesive is prepared. When the film is formed or bonded at low temperature, the polyamide epoxy compound is used as a cross-linking agent and a thickening agent to form a cross-linking structure, so that the soybean protein, the triazine ring group high-reactivity polyfunctional epoxy compound and the polyamide epoxy compound form a cross-linking interpenetrating network. Therefore, the prepressing formaldehyde-free soy protein adhesive prepared by the invention has the performances of high adhesion and good water resistance.

The properties of hyperbranched polymers are generally influenced by the backbone and the terminal functional groups, so that the terminal of hyperbranched polymers can be modified to meet different requirements. The main modification modes comprise (1) short chain end capping with organic matters or polymers; (2) grafting the polymer end by living polymerization; (3) growing or grafting hyperbranched polymer on the surface of the material; (4) grafting a hyperbranched polymer on the polymer; (5) blending or crosslinking. The invention selects the anion soluble hyperbranched long-chain high-molecular compound, can play a role in synergy with the cross-linking agent of the invention, and improves the prepressing performance of the soy protein adhesive.

According to the invention, the internal nonpolar group, the blocked protein molecule polar group and the grafted active group are exposed by destroying the protein molecule space structure, a cross-linking agent is added to form a cross-linking structure between proteins, the soybean meal oligosaccharide is cross-linked/modified, the soybean meal oligosaccharide and synthetic resin are blended to form an interpenetrating network structure, and a microphase separation structure is constructed to improve the water-resistant adhesive bonding performance of the soybean protein adhesive. The water-resistant bonding performance of the soy protein adhesive can be effectively improved through specific crosslinking modification.

Preferably, the prepressing formaldehyde-free soy protein adhesive is based on low-temperature precured prepressing soy protein adhesive and comprises the following raw materials in parts by weight: 20-50 parts of soybean protein powder, 55-75 parts of water, 2-6 parts of polyamide epoxy compound, 3-10 parts of low-temperature film-forming emulsion and 0.01-5 parts of triazine ring group high-reactivity polyfunctional epoxy compound.

The soybean protein adhesive is precured to form a large number of adhesive nails, the low-temperature precuring behavior and the curing degree of the soybean protein adhesive play an important role in improving the prepressing performance of the adhesive, and the prepressing performance of the soybean protein adhesive is improved by constructing the low-temperature precuring system.

The invention takes soy protein as a basic raw material, a polyamide epoxy compound as a cross-linking agent viscosity reducer, and adds low-temperature film-forming emulsion and triazine ring group high-reaction activity polyfunctional epoxy compound as a prepressing reinforcing agent to prepare the high prepressing adhesive.

More preferably, the low-temperature pre-cured prepressing soy protein adhesive comprises the following raw materials in parts by weight: 30 parts of soybean protein, 65 parts of water, 4 parts of polyamide epoxy compound, 6 parts of low-temperature film-forming emulsion and 2 parts of triazine ring group high-reaction-activity polyfunctional epoxy compound.

Further preferably, the low-temperature film-forming emulsion is an acrylic emulsion or a styrene-acrylic emulsion.

Preferably, the prepressing aldehyde-free soy protein adhesive is a prepressing aldehyde-free soy protein adhesive based on a gel system, and comprises the following raw materials in parts by weight: 20-50 parts of soybean protein powder, 55-75 parts of water, 2-6 parts of cationic epoxy compound and 0.01-5 parts of anion soluble hyperbranched long-chain high-molecular compound.

The high-prepressing-property adhesive is prepared by using a cationic epoxy compound as a crosslinking agent, an anionic high-molecular compound as a reinforcing agent and gels with different charges of the cationic epoxy compound and the reinforcing agent. The construction of the gel system in the soy protein adhesive system can effectively improve the pre-pressing property of the adhesive, and the construction of the double-electric gel system can optimize the gel system and improve the pre-pressing property of the soy protein adhesive.

More preferably, the prepressing aldehyde-free soy protein adhesive based on the gel system comprises the following raw materials in parts by weight: 30 parts of soybean protein powder, 67 parts of water, 3 parts of cationic epoxy compound and 0.02 part of anionic soluble hyperbranched long-chain high-molecular compound.

Further preferably, the anion-soluble hyperbranched long-chain polymer compound is polystyrene sulfonic acid or polystyrene-polybutadiene-polystyrene triblock thermoplastic elastomer.

Further preferably, the cationic epoxy compound is an epoxy compound having a quaternary ammonium group.

Preferably, the preparation method of the aluminum-wood heterogeneous composite technical wood comprises the following steps:

(1) coating a first adhesive on more than 1 layer of the Alus veneers to prepare a first blank plate layer through recombination;

(2) coating a second adhesive on one surface of the two blank plates A, and compounding, pressurizing and gluing the two blank plates A with a pretreated aluminum plate to obtain a second blank plate layer;

(3) compounding and recombining the second blank plate layer and the AlUS veneer coated with the third adhesive, pressurizing, and preserving to prepare an AlUS veneer and aluminum veneer heterogeneous composite technical wood beam;

(4) and slicing the obtained aluminum-wood heterogeneous composite technical wood batten to obtain the aluminum-wood heterogeneous composite technical wood board with the required specification.

The project adopts the surface pretreatment of metal aluminum, preferably selects a high-strength heterogeneous composite formaldehyde-free adhesive, is formed by aesthetic pattern design and die pressing recombination with a fast-growing wood veneer, and can cut out scientific and technical wood decorative materials with different thickness specifications in multiple application scenes by adopting a coated hard alloy cutter. The product not only has the metallic luster decorative effect which is not possessed by the traditional technical wood, but also has high heat-conducting property and electric conductivity, can be used for special places such as ground heating floors or electromagnetic shielding requirements and the like, widens the application field of the technical wood, improves the added value of the wood, and has wide market prospect.

Further preferably, the aluminum plate in the step (2) is subjected to a pretreatment step of degreasing the surface with alkali liquor and neutralizing with acid liquor.

Further preferably, the pressurizing time in the step (3) is 120-240 hours, the pressure is 0.6-0.8 MPa, and the curing is carried out for 20-40 days.

Further preferably, the slicing of step (4) comprises: selecting a high-strength titanium alloy planing cutter, and planing and cutting the wood beam at an included angle of 55-65 degrees between the advancing direction of the planing cutter and the long edge of the wood beam.

The invention can adjust the local elastic deformation and the stress in the slicing process by a specific slicing mode, and solves the problems that when a heterogeneous composite technical wood batten is sliced by a traditional slicing mode, because the material of the wood part is different from that of the aluminum part, a planer tool is unevenly stressed in the slicing process, local tearing is generated, and the quality of a technical wood veneer (veneer) cannot meet the requirement.

Further preferably, the first adhesive is an aqueous polymer-isocyanate adhesive with a solid content of 50-60% and a viscosity of 500-600mPa · s.

More preferably, the viscosity of the second adhesive is 250-350 mPa.s, and the gluing amount is 150-180 g per square meter.

A preparation method of a prepressing formaldehyde-free soy protein adhesive comprises the following steps:

s1, the raw materials of the following components are proportioned according to the parts by weight: 20-50 parts of soybean meal powder with 58-65% of protein content, 55-75 parts of water, 2-6 parts of cross-linking agent and 0.01-5 parts of reinforcing agent;

s2, adding a cross-linking agent into water, performing ultrasonic treatment for 3-6 minutes, adding 20-40% of soybean meal powder, and homogenizing and emulsifying under 40-50MPa for 10-15min to obtain a first mixture;

s3, adding the rest soybean meal powder into the first mixture, mixing uniformly, and adding

40-70% of an enhancer, and reacting at 40-50 ℃ for 25-35 minutes to obtain a second mixture;

and S4, adding the residual reinforcing agent into the second mixture, reacting at 50-70 ℃ for 5-8min, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

According to the invention, homogeneous conditions are utilized to uniformly disperse the cross-linking agent (polyamide epoxy compound or cationic epoxy compound), and spherical aggregates in the soybean meal can be opened to increase the contact area with the cross-linking agent, so that the performance can be synergistically improved, the uniformity and stability of an adhesive system are facilitated, and the addition amount of the cross-linking agent is reduced.

Preferably, for the high pre-compaction soy protein adhesive based on low-temperature pre-curing, the step S2 further includes adding a half of the low-temperature film forming agent after homogenizing and emulsifying to form a first mixture; and step S3, adding the rest of soybean meal powder into the first mixture, uniformly mixing, adding 40-70% of reinforcing agent, and then adding the rest of low-temperature film-forming agent for reaction to obtain a second mixture.

According to the invention, the soybean meal, the cross-linking agent, the low-temperature film-forming agent and the reinforcing agent are added in batches by stages, so that the polymerization degree of the soybean meal can be improved, the formation of a branched structure is facilitated, and the reaction activity of the soybean protein is improved; the protein denaturation degree and the molecular weight of an adhesive system are effectively improved, the prepressing performance and the bonding performance of the adhesive are improved, the hot-pressing temperature and time of the adhesive are reduced, the manufacturability of the adhesive is enhanced, and the bonding performance of the adhesive is synergistically enhanced.

The plate forming process comprises prepressing, wherein the prepressing process comprises a first high pressure, a second low pressure, a third low pressure and a fourth low pressure; the first high pressure is 0.8-1.4MPa, and the pressure application time is 10-30% of the total prepressing time; the second low pressure is 0.2-0.8MPa, and the pressure application time is 20-40% of the total pre-pressing time; the third low pressure is 0.5-1.1MPa, and the pressure application time is 10-30% of the total pre-pressing time; the fourth low pressure is 0.2-0.8MPa, and the pressing time is 10-40% of the total prepressing time.

The method comprises the steps of prepressing a single plate with the water content of 30% for 2 hours, and forming; molding the veneer with the water content of 25% for 1 hour; the veneer with the water content of below 20 percent is molded for 0.5 hour.

The specific multi-stage prepressing method can improve the prepressing performance and the bonding performance of the adhesive, reduce the hot-pressing temperature and time of the adhesive, enhance the manufacturability of the adhesive and simultaneously synergistically enhance the bonding performance of the adhesive. According to the invention, the prepressing performance of the soybean protein adhesive is improved through chemical modification, particularly the prepressing performance of a single plate with high water content (more than or equal to 30 percent), the popularization and application of the soybean protein adhesive can be improved, the environmental protection grade of a plate product is further improved, and the market is led to develop towards healthy plates. The single board with good bonding strength, good water resistance, high viscosity, good stability and good subsequent machining performance can be prepared by the soybean protein adhesive with a specific formula and combining the specific multi-stage prepressing method.

Preferably, the first high-pressure is 1.1MPa, and the pressing time is 20% of the total prepressing time; the second low-pressure is 0.5MPa, and the pressure application time is 30% of the total prepressing time; the third low-pressure is 0.8MPa, and the pressure application time is 20% of the total prepressing time; the fourth low-pressure is 0.5MPa, and the pressing time is 30% of the total prepressing time.

Preferably, the sheet forming process comprises the following steps:

s11, adhering the Alus veneer with the surface impregnated or coated with the pre-pressing aldehyde-free soy protein adhesive and a second blank plate layer together;

s12, prepressing for 8-15 minutes;

and S13, pressurizing and curing the pre-pressed plate to obtain the required plate.

In conclusion, the invention has the following beneficial effects:

1. according to the invention, the composite recombined technical wood with the special luster decorative effect is prepared by compositely laminating the wood and the metal material, the rigidity and toughness of the product are improved, the product is not easy to crack, the stability is good, the metal luster decorative effect is realized, and the diversified consumption requirements can be met;

2. the soybean protein adhesive has important influence on the prepressurity of the adhesive in the protein permeation and curing processes, the soybean protein adhesive has good effect on the microcosmic dynamic permeation of the single plates, and the water contents of different single plates can adapt to the permeation and adhesive layer distribution of the soybean protein adhesive. The adhesive is used for forming the Alus veneers with the water content of 30% within 2 hours; forming the Alyosi veneer with the water content of 25% for 1 hour; shaping the Aluss veneer with the water content of below 20 percent within 0.5 hour. The soybean protein adhesive disclosed by the invention is detected, and free formaldehyde is detected; the content of free phenol is less than or equal to 0.2 percent; the total volatile organic compounds are less than or equal to 100g/L (meeting the highest requirement of GB18583-2008 'Limited amount of harmful substances in adhesive for interior decoration and finishing materials').

3. According to the invention, the soybean meal, the cross-linking agent, the low-temperature film-forming agent and the reinforcing agent are added in batches by stages, so that the polymerization degree of the soybean meal can be improved, the formation of a branched structure is facilitated, and the reaction activity of the soybean protein is improved; the protein denaturation degree and the molecular weight of an adhesive system are effectively improved, the prepressing performance and the bonding performance of the adhesive are improved, the hot-pressing temperature and time of the adhesive are reduced, the manufacturability of the adhesive is enhanced, and the bonding performance of the adhesive is synergistically enhanced.

4. The specific multi-stage prepressing method can improve the prepressing performance and the bonding performance of the adhesive, reduce the hot-pressing temperature and time of the adhesive, enhance the manufacturability of the adhesive and simultaneously synergistically enhance the bonding performance of the adhesive. According to the invention, the prepressing performance of the soybean protein adhesive is improved through chemical modification, particularly the prepressing performance of a single plate with high water content (more than or equal to 30 percent), the popularization and application of the soybean protein adhesive can be improved, the environmental protection grade of a plate product is further improved, and the market is led to develop towards healthy plates. The single board with good bonding strength, good water resistance, high viscosity, good stability and good subsequent machining performance can be prepared by the soybean protein adhesive with a specific formula and combining the specific multi-stage prepressing method.

5. The invention can adjust the local elastic deformation and the stress in the slicing process by a specific slicing mode, and solves the problems that when a heterogeneous composite technical wood batten is sliced by a traditional slicing mode, because the material of the wood part is different from that of the aluminum part, a planer tool is unevenly stressed in the slicing process, local tearing is generated, and the quality of a technical wood veneer (veneer) cannot meet the requirement.

Detailed Description

Low-temperature pre-curing-based prepressing soy protein adhesive formula 1: the composition comprises the following raw materials in parts by weight: 20 parts of soybean protein powder, 55 parts of water, 2 parts of polyamide epoxy compound and 5 parts of triazine ring group high-reaction-activity polyfunctional epoxy compound. The soybean protein is soybean meal powder with protein content of 58%. The low-temperature film-forming emulsion is acrylic emulsion or styrene-acrylic emulsion.

Low-temperature pre-curing-based prepressing soy protein adhesive formula 2: the composition comprises the following raw materials in parts by weight: 50 parts of soybean protein powder, 75 parts of water, 6 parts of polyamide epoxy compound and 0.01 part of triazine ring group high-reaction-activity polyfunctional epoxy compound. The soybean protein is soybean meal powder with 65% of protein content.

The low-temperature pre-cured prepressing soy protein adhesive formula 3 comprises the following raw materials in parts by weight: 30 parts of soybean protein powder, 65 parts of water, 4 parts of polyamide epoxy compound and 2 parts of triazine ring group high-reaction-activity polyfunctional epoxy compound. The soybean protein is soybean meal powder with protein content of 60%.

The prepressing aldehyde-free soy protein adhesive formula 1 based on a gel system comprises the following raw materials in parts by weight: 20 parts of soybean protein powder, 55 parts of water, 2 parts of cationic epoxy compound and 5 parts of polystyrene sulfonic acid. The soybean protein is soybean meal powder with protein content of 58%.

The prepressing formaldehyde-free soy protein adhesive formula 2 based on the gel system comprises the following raw materials in parts by weight: 50 parts of soybean protein powder, 75 parts of water, 6 parts of cationic epoxy compound and 0.01 part of polystyrene-polybutadiene-polystyrene triblock thermoplastic elastomer. The soybean protein is soybean meal powder with 65% of protein content.

The prepressing aldehyde-free soy protein adhesive formula 3 based on the gel system comprises the following raw materials in parts by weight: 30 parts of soybean protein powder, 67 parts of water, 3 parts of cationic epoxy compound with quaternary ammonium group and 0.02 part of polystyrene sulfonate. The soybean protein is soybean meal powder with protein content of 60%.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 1

The preparation method of the prepressing aldehyde-free soy protein adhesive comprises the following steps:

s1, proportioning the pre-pressing soy protein adhesive formula 1 based on low-temperature pre-curing;

s2, adding the polyamide epoxy compound into water, performing ultrasonic treatment for 3 minutes, adding 20% of soybean meal powder, and homogenizing and emulsifying for 15min under 40MPa to obtain a first mixture;

s3, adding the residual soybean meal powder into the first mixture, uniformly mixing, adding 40% of triazine ring group high-reaction-activity polyfunctional epoxy compound, and reacting at 40 ℃ for 25 minutes to obtain a second mixture;

and S4, adding the residual triazine ring group high-reactivity polyfunctional epoxy compound into the second mixture, reacting for 8min at 70 ℃, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 2

The preparation method of the prepressing aldehyde-free soy protein adhesive comprises the following steps:

s1, proportioning according to a formula 2 of the low-temperature pre-cured prepressing soy protein adhesive;

s2, adding the polyamide epoxy compound into water, performing ultrasonic treatment for 6 minutes, adding 40% of soybean meal powder, and homogenizing and emulsifying for 10min under 50MPa to obtain a first mixture;

s3, adding the residual soybean meal powder into the first mixture, uniformly mixing, adding 50% of triazine ring group high-reaction-activity polyfunctional epoxy compound, and reacting at 50 ℃ for 35 minutes to obtain a second mixture;

and S4, adding the residual triazine ring group high-reactivity polyfunctional epoxy compound into the second mixture, reacting at 50 ℃ for 5min, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 3

The preparation method of the prepressing aldehyde-free soy protein adhesive comprises the following steps:

s1, proportioning according to a formula 3 of the low-temperature pre-cured prepressing soy protein adhesive;

s2, adding the polyamide epoxy compound into water for over 5 minutes, adding 30% of soybean meal powder, and homogenizing and emulsifying for 12min under 45MPa to obtain a first mixture;

s3, adding the residual soybean meal powder into the first mixture, uniformly mixing, adding 50% of triazine ring group high-reaction-activity polyfunctional epoxy compound, and reacting at 45 ℃ for 30 minutes to obtain a second mixture;

and S4, adding the residual triazine ring group high-reactivity polyfunctional epoxy compound into the second mixture, reacting at 60 ℃ for 7min, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 4

The same as example 1, except that 3 parts of acrylic emulsion was also included in the formulation. Step S2 further includes adding half of the acrylic emulsion after homogenizing to form a first mixture; and step S3, adding the rest of soybean meal powder into the first mixture, uniformly mixing, adding 40% of triazine ring group high-reaction-activity polyfunctional epoxy compound, and then adding the rest of acrylic emulsion for reaction to obtain a second mixture.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 5

The same as example 2, except that 10 parts of styrene-acrylic emulsion is also included in the formula. Step S2, adding half of styrene-acrylic emulsion after homogenizing and emulsifying to form a first mixture; and step S3, adding the rest of soybean meal powder into the first mixture, uniformly mixing, adding 70% of triazine ring group high-reaction-activity polyfunctional epoxy compound, and then adding the rest of styrene-acrylic emulsion for reaction to obtain a second mixture.

Prepressurizing aldehyde-free soy protein adhesive example 6

The same as example 3, except that 6 parts of acrylic emulsion was also included in the formulation. Step S2 further includes adding half of the acrylic emulsion after homogenizing to form a first mixture; and step S3, adding the rest of soybean meal powder into the first mixture, uniformly mixing, adding 50% of triazine ring group high-reaction-activity polyfunctional epoxy compound, and then adding the rest of acrylic emulsion for reaction to obtain a second mixture.

Prepressurizing aldehyde-free soy protein adhesive example 7

The preparation method of the prepressing aldehyde-free soy protein adhesive comprises the following steps:

s1, proportioning according to a prepressing formaldehyde-free soy protein adhesive formula 1 based on a gel system;

s2, adding a cationic epoxy compound into water, performing ultrasonic treatment for 3 minutes, adding 20% of soybean meal powder, and homogenizing and emulsifying for 10min under 40MPa to obtain a first mixture;

s3, adding the rest soybean meal powder into the first mixture, uniformly mixing, adding 40% of anionic soluble hyperbranched long-chain polymer compound, and reacting at 40 ℃ for 25 minutes to obtain a second mixture;

and S4, adding the residual anion soluble hyperbranched long-chain polymer compound into the second mixture, reacting at 50 ℃ for 8min, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 8

The preparation method of the prepressing aldehyde-free soy protein adhesive comprises the following steps:

s1, proportioning according to a formula 2 of the prepressing formaldehyde-free soybean protein adhesive based on a gel system;

s2, adding a cationic epoxy compound into water, performing ultrasonic treatment for 6 minutes, adding 20-40% of soybean meal powder, and homogenizing and emulsifying for 15min under 50MPa to obtain a first mixture;

s3, adding the rest soybean meal powder into the first mixture, uniformly mixing, adding 70% of anionic soluble hyperbranched long-chain polymer compound, and reacting at 50 ℃ for 35 minutes to obtain a second mixture;

and S4, adding the residual anion soluble hyperbranched long-chain polymer compound into the second mixture, reacting at 70 ℃ for 5min, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

PREPREPRESSURIZABLE ALDEHYDE-FREE SOYBEAN PROTEIN ADHESIVE EXAMPLE 9

The preparation method of the prepressing aldehyde-free soy protein adhesive comprises the following steps:

s1, proportioning according to a prepressing formaldehyde-free soy protein adhesive formula 3 based on a gel system;

s2, adding a cationic epoxy compound into water, performing ultrasonic treatment for 5 minutes, adding 20-40% of soybean meal powder, and homogenizing and emulsifying for 12min under 45MPa to obtain a first mixture;

s3, adding the rest soybean meal powder into the first mixture, uniformly mixing, adding 60% of anionic soluble hyperbranched long-chain polymer compound, and reacting at 47 ℃ for 28 minutes to obtain a second mixture;

and S4, adding the residual anion soluble hyperbranched long-chain polymer compound into the second mixture, reacting at 55 ℃ for 7min, and cooling to room temperature to obtain the pre-pressed aldehyde-free soybean protein adhesive.

Prepressurizing aldehyde-free soy protein adhesive application example 1

The plate forming process for prepressing and preparing the first blank plate layer by utilizing the prepressing formaldehyde-free soy protein adhesive comprises the following steps:

s11, sequentially bonding the Alus veneers with the surface impregnated or coated with the pre-pressing aldehyde-free soybean protein adhesive; the glue application amount is 260g/m²。

S12, prepressing for 15 minutes; the pre-pressing process comprises a first high pressure, a second low pressure, a third low pressure and a fourth low pressure; the first high-pressure is 0.8MPa, and the pressure application time is 10% of the total prepressing time; the second low-pressure is 0.2MPa, and the pressure application time is 40% of the total prepressing time; the third low-pressure is 0.5MPa, and the pressure application time is 30% of the total prepressing time; the fourth low-pressure is 0.8MPa, and the pressing time is 20% of the total prepressing time.

And S13, carrying out hot pressing on the pre-pressed plate, wherein the hot pressing temperature is 120 ℃, the hot pressing pressure is 200 tons, the hot pressing time is 12min, and cooling and shaping to obtain the required first blank plate layer.

Prepressurizing aldehyde-free soy protein adhesive application example 2

The plate forming process for prepressing and preparing the first blank plate layer by utilizing the prepressing formaldehyde-free soy protein adhesive comprises the following steps:

s11, sequentially bonding the Alus veneers with the surface impregnated or coated with the pre-pressing aldehyde-free soybean protein adhesive; the glue application amount is 260g/m²。

S12, prepressing for 8 minutes; the pre-pressing process comprises a first high pressure, a second low pressure, a third low pressure and a fourth low pressure; the first high-pressure is 1.4MPa, and the pressure application time is 30% of the total prepressing time; the second low-pressure is 0.8MPa, and the pressure application time is 20% of the total prepressing time; the third low-pressure is 1.1MPa, and the pressure application time is 10% of the total prepressing time; the fourth low-pressure is 0.2MPa, and the pressing time is 40% of the total prepressing time.

And S13, carrying out hot pressing on the pre-pressed plate, wherein the hot pressing temperature is 140 ℃, the hot pressing pressure is 150 tons, the hot pressing time is 16min, and cooling and shaping to obtain the required first blank plate layer.

Prepressurizing aldehyde-free soy protein adhesive application example 3

The plate forming process for prepressing and preparing the first blank plate layer by utilizing the prepressing formaldehyde-free soy protein adhesive comprises the following steps:

s11, sequentially bonding the Alus veneers with the surface impregnated or coated with the pre-pressing aldehyde-free soybean protein adhesive; the glue application amount is 260g/m²。

S12, prepressing for 12 minutes; the pre-pressing process comprises a first high pressure, a second low pressure, a third low pressure and a fourth low pressure; the first high pressure is 1.1MPa, and the pressure applying time is 20% of the total prepressing time; the second low-pressure is 0.5MPa, and the pressure application time is 30% of the total prepressing time; the third low-pressure is 0.8MPa, and the pressure application time is 20% of the total prepressing time; the fourth low-pressure is 0.5MPa, and the pressure application time is 30% of the total prepressing time;

and S13, carrying out hot pressing on the pre-pressed plate, wherein the hot pressing temperature is 130 ℃, the hot pressing pressure is 180 tons, the hot pressing time is 14min, and cooling and shaping to obtain the required first blank plate layer.

Comparative example 1 Soy protein adhesive

The formula of the soy protein adhesive comprises the following raw materials in parts by weight: 20 parts of soybean protein powder, 55 parts of water and 5 parts of plant nano-cellulose. The soybean protein is soybean meal powder with protein content of 58%. The process for the preparation of the panels was the same as in application example 1.

Comparative example 2 of soy protein adhesive

The soybean protein adhesive comprises the following raw materials in parts by weight: 10 parts of soybean protein powder, 85 parts of water, 8 parts of polyamide epoxy compound, 3-10 parts of low-temperature film-forming emulsion and 0.01-5 parts of triazine ring group high-reaction-activity polyfunctional epoxy compound. The process for the preparation of the panels was the same as in application example 2.

Comparative example 3 of soy protein adhesive

The soybean protein adhesive comprises the following raw materials in parts by weight: 60 parts of soybean protein powder, 40 parts of water, 1 part of cationic epoxy compound and 8 parts of anionic soluble hyperbranched long-chain high-molecular compound. The process for the preparation of the panels was the same as that used in application example 3.

Detection test 1: static bending strength test

The static bending strength (three points) and the elastic modulus of the artificial board samples prepared in the examples 1-3 and the comparative examples 1-3 are tested by using an universal electronic tensile testing machine according to GB/T17657 plus 2013 physicochemical property test method for artificial boards and veneers, and the obtained results are shown in Table 1.

TABLE 1 static bending Strength and elastic modulus test results

Detection test 2: water absorption swelling test

The water absorption rates of the artificial board samples prepared in the examples 1-3 and the comparative examples 1-3 were tested by using a water tank and a micrometer according to GB/T17657 and 2013 physicochemical property test method for artificial boards and veneered artificial boards, and the obtained results are shown in Table 2.

TABLE 2 Water swelling Rate

Detection test 3: bond Strength test

The bonding strength and the surface bonding strength of the artificial boards prepared in examples 1-3 and comparative examples 1-3 were tested by using a universal tensile testing machine according to GB/T17657 plus 2013 physicochemical property test method for artificial boards and veneered artificial boards, and the obtained results are shown in Table 3.

TABLE 3 bonding Strength test results