CN114736507A - Preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive - Google Patents
Preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive Download PDFInfo
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Abstract
The invention discloses a preparation method of a biomass-based modified aldehyde-free environment-friendly artificial board adhesive, which comprises the steps of uniformly mixing lignin and lanthanum niobate to obtain a mixture, then filling the mixture into a transparent PE film packaging bag which can be vacuumized, paving the bag into a thin layer, sealing the bag and vacuumizing the bag, and then carrying out irradiation treatment on the mixture by taking cobalt 60 as a radiation source according to the irradiation dose of 45-75 kGy; removing the PE film from the irradiated mixture, spraying sterilized deionized water into the mixture, adding lignin degrading enzyme, and uniformly mixing to obtain modified lignin; then weighing the following components in parts by weight: 100 parts of MDI glue, 15-25 parts of modified lignin, 5-12 parts of inorganic powder and 3-8 parts of diluent; and then sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, and stirring and mixing to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive.
Description
Technical Field
The invention belongs to the technical field of artificial board adhesives, and particularly relates to a preparation method of a biomass-based modified formaldehyde-free environment-friendly artificial board adhesive.
Background
In recent years, the application market of artificial boards has been strongly pursued for green aldehyde-free boards, the aldehyde-free glue capable of being industrially applied at present is diphenylmethane diisocyanate (MDI) glue, and numerous artificial board enterprises begin to apply MDI glue to prepare artificial boards, so that the requirement of green aldehyde-free is met. In the traditional artificial board preparation process, the adhesive application amount of MDI accounts for 13-15% of the weight of the whole board, accounts for more than 50% of the production cost of the artificial board, and is a decisive factor influencing the market competitiveness of the artificial board; the cost ratio of the artificial board adhesive is reduced on the basis of maintaining the original performance of the artificial board by compounding other environment-friendly adhesives or reducing the adhesive application amount, and the method is a key for promoting the large-scale application of the formaldehyde-free shaving board.
In addition, single MDI's consistency is high, and when mixing with the shaving board, MDI glue is difficult to disperse on the shaving surface, very easily causes the adhesion inhomogeneous, will cause oriented strand board internal stress after the hot pressing inhomogeneous will appear splitting delaminating phenomenon, has seriously restricted the application of shaving board. Therefore, the development of an artificial board adhesive which is environment-friendly, safe, low in adhesive application amount and capable of being uniformly dispersed on the surface of wood shavings becomes a hot point of research.
Disclosure of Invention
Aiming at the defects, the invention discloses a preparation method of a biomass-based modified aldehyde-free environment-friendly artificial board adhesive, which is used for producing a composite environment-friendly artificial board adhesive and solving the problems that the adhesive is not easy to disperse on the surface of wood shavings and the adhesive application amount is high.
The invention is realized by adopting the following technical scheme:
a preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobate to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobate is 100 (0.2-1), then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 1.5 cm-2 cm, sealing and vacuumizing the thin layer, and then performing irradiation treatment on the mixture according to the irradiation dose of 45-75 kGy by taking cobalt 60 as a radiation source; transferring the mixture subjected to irradiation treatment into a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 10-15% of that of the lignin, then adding lignin degrading enzyme, uniformly mixing, and then placing at 25-35 ℃ for 48-72 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500 (1-2);
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 15-25 parts of modified lignin, 5-12 parts of inorganic powder and 3-8 parts of diluent; and sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 5-10 min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a particle board within 30min to finish gluing.
The lignin is a biopolymer with a three-dimensional network structure formed by mutually connecting 3 phenylpropane units through ether bonds and carbon-carbon bonds, and contains abundant active groups such as aromatic ring structures, aliphatic and aromatic hydroxyl groups, quinonyl groups and the like. Currently, the main access route for lignin is extraction from pulp waste liquor. The lignin is subjected to alkaline hydrolysis to a certain degree under the action of alkali, so that the solubility of the lignin is increased, the lignin is extracted, and the obtained lignin is called alkali lignin after precipitation separation; extracting lignin by a klason method to obtain the lignin which is called klason lignin; extracting from the kraft pulp a thiolignin; extracted from sulfite pulp is lignosulfonate, mainly in the form of calcium lignosulfonate and sodium lignosulfonate. Lignin can be slowly degraded in specific fungal, bacterial and corresponding microbial community environments to form lignin molecular chain fragments, aromatic compounds, even carbon dioxide, water and the like. The degradation process mainly relies on the non-specific oxidation of a series of lignin-degrading enzymes, including lignin peroxidase, manganese peroxidase and laccase.
In summary, lignin is an amorphous thermoplastic polymer, has no melting point, but has a glass transition property, can be softened under a certain pressure, has fluidity and tackiness, and is a natural adhesive with excellent performance. However, lignin is a polyphenol high molecular compound, a large number of active groups are wrapped in the molecule, the intermolecular interaction is strong, the aromatic ring structure is interwoven into a net, and the defects of low reaction activity, high softening temperature point, poor fluidity and the like exist; therefore, the lignin is modified to obtain a lignin molecular chain segment with high fluidity and reactivity, the lignin and lanthanum niobate are mixed firstly, the lanthanum niobate is a layered metal oxide with a perovskite structure, shows stronger acidity than other similar metal oxide materials, and has excellent potential capability in the field of photocatalyst materials, then a PE plastic film is used for carrying out oxygen and bacteria isolation on the lignin, gamma-rays generated by radioactive isotope cobalt 60 are used for preprocessing the lignin, and on the one hand, the lignin is sterilized, so that the interference of bacteria such as escherichia coli, staphylococcus aureus, salmonella, candida, aspergillus niger and the like on the next lignin and hemicellulose enzymolysis reaction can be reduced to the maximum extent; on the other hand, the lamellar lanthanum niobate catalyst is added into the lignin powder, so that the C-O bond on the lignin molecular chain can be catalyzed to be broken under the action of gamma-rays, and on the basis of reducing the lignin molecular weight, more lignin molecular chain segments with active groups are formed.
Meanwhile, the lignin product extracted in the pulping process is combined with the lignin through stable covalent bonds, so that the complete separation of the lignin and the hemicellulose is generally difficult to realize, and most of the lignin and hemicellulose are lignin-hemicellulose compounds. After the irradiation treatment is carried out on the lignin, the lignin is degraded by using the lignin peroxidase/laccase compound enzyme to form a series of lignin molecular chain segments with low molecular weight, polyhydroxy and multi-aldehyde structures, so that the purposes of increasing the fluidity of the lignin under the high-temperature condition and improving the reactivity of the lignin with MDI glue and wood shavings surface hydroxyl groups are achieved.
The talcum powder is an industrial product, the general boundary grade (containing talcum) of the talcum powder is 35 percent, the industrial grade is 50 percent, and after separation, the talcum tailings such as slag pulp, waste materials, leftover materials and the like with low grade and poor whiteness lack a low-cost large-batch resource utilization method and are main pollution sources of mines. Aiming at the problem, the talc tailing powder is recycled and added into the adhesive, and the talc has an anti-caking effect and can be used as a mold release agent and an anti-sticking agent, so that the apparent viscosity of the adhesive can be reduced by adding the talc tailing powder, and the phenomena that the adhesive is not easy to disperse and is not uniformly adhered on the surface of wood shavings due to overhigh adhesive viscosity in the adhesive spraying process are avoided; on the other hand, the talc tailing powder can be fully filled into gaps among the shavings, so that the stress defect of the shavings is reduced, and the mechanical strength is improved.
Meanwhile, the propylene glycol, the diethylene glycol, the paraffin and the water are mixed according to the proportion to prepare the diluent, and the diluent is added into the adhesive, so that on one hand, the sizing uniformity can be improved by reducing the viscosity of the MDI adhesive according to the characteristic of the MDI adhesive as a solvent; meanwhile, the propylene glycol and the diethylene glycol in the diluent components have active hydroxyl groups, so that the propylene glycol and the diethylene glycol can be used as bridges for connecting MDI (diphenylmethane diisocyanate) glue and lignin, and the bonding performance of the adhesive and the water resistance of a shaving board product are improved by forming a more complex reticular cross-linked structure.
The MDI glue is any one of WANNATE CW-20, WANNATE PM300 and WANNATE PM-200 in Wanhua chemistry.
Further, the lignin comprises any one of alkali lignin, acid soluble lignin, Klason lignin, thiolignin, sodium lignosulfonate and calcium lignosulfonate; preferably any one of alkali lignin and Klason lignin.
Furthermore, the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7。
Further, the lignin degrading enzyme is a complex enzyme obtained by mixing lignin peroxidase and laccase, and the weight ratio of the lignin peroxidase to the laccase in the complex enzyme is (1-3): 1.
Further, the inorganic powder is talc tailings with the grain size of 400-600 meshes, the talc tailings contain more than 20wt% of talc, and the talc tailings also contain one or more of dolomite, quartz, chlorite and calcite.
Furthermore, the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
Compared with the prior art, the technical scheme has the following beneficial effects:
1. the lignin is a renewable polymer, mainly exists in pulping waste liquor, and is a natural adhesive. According to the invention, the adhesive for producing the artificial board is prepared by modifying and pretreating lignin and mixing the lignin with the MDI adhesive, the inorganic powder and the diluent, so that the use amount of the MDI adhesive based on chemical synthesis and non-renewable performance can be reduced to a certain extent, and the adhesive also has the characteristics of safety, greenness and environmental protection.
2. The reaction of the lignin modification method is milder, and the conventional lignin activation reaction generally needs organic solvent, high temperature and H2And under harsh conditions such as atmosphere and the like, a better product can be obtained only by reacting for more than 2-5 hours at the temperature of more than 200 ℃. The invention adopts irradiation-enzymolysis modificationThe method can obtain lignin molecular chain segment with low molecular weight, high activity and high fluidity under mild conditions.
3. The adhesive produced by the invention has more excellent adhesive effect, can effectively reduce the viscosity of the adhesive by adding materials such as modified lignin, talc tailings and diluents, and generates a complex reticular polymer structure, so that the adhesive applying uniformity and the adhesive property of the adhesive are improved, and the process is simple and has strong operability.
Detailed Description
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. The specific experimental conditions and methods not indicated in the following examples are generally conventional means well known to those skilled in the art.
Example 1:
a preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobic acid to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobic acid is 100:0.4, then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 1.75cm, sealing the thin layer, carrying out gas treatment to-0.1 Mpa, and then carrying out irradiation treatment on the mixture according to the irradiation dose of 55kGy by taking cobalt 60 as a radiation source; transferring the mixture after irradiation treatment to a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 12% of that of the lignin, adding lignin degrading enzyme, uniformly mixing, and standing at 28 ℃ for 56 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500: 1.2; the lignin is Klason lignin; the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7(ii) a The lignin degrading enzyme is a composite enzyme obtained by mixing lignin peroxidase and laccase, and in the composite enzyme, the weight ratio of the lignin peroxidase to the laccase is 1.85: 1;
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 19 parts of modified lignin, 8 parts of inorganic powder and 5.5 parts of diluent; sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 8min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a particle board within 30min to finish gluing; the MDI glue is WANNATE CW-20 of Wanhua chemistry; the inorganic powder is talc tailings with the grain size of 450 meshes, the talc tailings contain 30wt% of talc, and the talc tailings also contain dolomite and quartz; the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
Example 2:
a preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobic acid to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobic acid is 100:0.2, then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 1.5cm, sealing the thin layer, carrying out gas treatment to-0.08 MPa, and then carrying out irradiation treatment on the mixture according to the irradiation dose of 45kGy by taking cobalt 60 as a radiation source; transferring the mixture after irradiation treatment to a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 10% of that of the lignin, adding lignin degrading enzyme, uniformly mixing, and standing at 25 ℃ for 48 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500: 1; the lignin is thiolignin; the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7(ii) a The lignin degrading enzyme is a composite enzyme obtained by mixing lignin peroxidase and laccase, and in the composite enzyme, the weight ratio of the lignin peroxidase to the laccase is 1: 1;
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 15 parts of modified lignin, 5 parts of inorganic powder and 3 parts of diluent; sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 5min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a particle board within 30min to finish gluing; the MDI glue is WANNATE CW-20 of Wanhua chemistry; the inorganic powder is talc tailings with the particle size of 400 meshes, the talc tailings contain 30wt% of talc, and the talc tailings also contain calcite; the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
Example 3:
a preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobic acid to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobic acid is 100:0.8, then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 1.9cm, sealing the thin layer, carrying out gas treatment to-0.1 Mpa, and then carrying out irradiation treatment on the mixture according to the irradiation dose of 65kGy by taking cobalt 60 as a radiation source; transferring the mixture after irradiation treatment to a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 14% of that of the lignin, then adding lignin degrading enzyme, uniformly mixing, and then placing at 32 ℃ for 64 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500: 1.8; the lignin is acid soluble lignin; the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7(ii) a The lignin degrading enzyme is a composite enzyme obtained by mixing lignin peroxidase and laccase, and the weight ratio of the lignin peroxidase to the laccase in the composite enzyme is 2.5: 1;
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 22 parts of modified lignin, 10 parts of inorganic powder and 7 parts of diluent; sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 8min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a shaving board within 30min to finish gluing; the MDI glue is WANNATE PM-200 of Wanhua chemistry; the inorganic powder is talc tailings with the particle size of 500 meshes, the talc tailings contain 32wt% of talc, and the talc tailings also contain dolomite, quartz stone and calcite; the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
Example 4:
a preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobate to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobate is 100:1, then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 2cm, sealing the thin layer, carrying out gas treatment to the pressure of-0.15 Mpa, and then carrying out irradiation treatment on the mixture according to the irradiation dose of 75kGy by taking cobalt 60 as a radiation source; transferring the mixture after the irradiation treatment into a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 15% of that of the lignin, then adding lignin degrading enzyme, uniformly mixing, and then standing at 35 ℃ for 72 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500: 2; the lignin is alkali lignin; the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7(ii) a The lignin degrading enzyme is a composite enzyme obtained by mixing lignin peroxidase and laccase, and in the composite enzyme, the weight ratio of the lignin peroxidase to the laccase is 3: 1;
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 25 parts of modified lignin, 12 parts of inorganic powder and 8 parts of diluent; sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 10 min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a particle board within 30min to finish gluing; the MDI glue is WANNATE PM300 in Wanhua chemistry; the inorganic powder is talc tailings with the grain size of 400-600 meshes, the talc tailings contain 40wt% of talc, and the talc tailings also contain dolomite and quartz; the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
Example 5:
a preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobic acid to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobic acid is 100:0.8, then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 1.8cm, sealing the thin layer, carrying out gas treatment to-0.1 Mpa, and then carrying out irradiation treatment on the mixture according to the irradiation dose of 60kGy by taking cobalt 60 as a radiation source; transferring the mixture after irradiation treatment to a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 12.5% of that of the lignin, then adding lignin degrading enzyme, uniformly mixing, and then placing at 30 ℃ for 60 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500: 2; the lignin is Klason lignin; the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7(ii) a The lignin degrading enzyme is a composite enzyme obtained by mixing lignin peroxidase and laccase, and the weight ratio of the lignin peroxidase to the laccase in the composite enzyme is 2.5: 1;
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 20 parts of modified lignin, 8 parts of inorganic powder and 5 parts of diluent; sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 10 min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a particle board within 30min to finish gluing; the MDI glue is WANNATE CW-20 of Wanhua chemistry; the inorganic powder is talc tailings with the particle size of 600 meshes, the talc tailings contain 35wt% of talc, and the talc tailings also contain dolomite; the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
Comparative example 1:
this comparative example differs from the preparation described in example 5 only in that lanthanum niobic acid was not added in step (1) and the other steps were carried out unchanged.
Comparative example 2:
the comparative example differs from the preparation method described in example 5 only in that, in step (1), lignin and lanthanum niobate are mixed without radiation treatment, and then sterilized deionized water and lignin-degrading enzyme are sequentially added to modify lignin.
Comparative example 3:
this comparative example differs from the preparation method described in example 5 only in that in step (1), sterilized deionized water and lignin-degrading enzyme are not added for treatment after the lignin is irradiated.
Comparative example 4:
the difference between the comparative example and the preparation method described in example 5 is that in step (2), the MDI adhesive, the modified lignin and the diluent in the same proportion are directly mixed to prepare the adhesive without adding the inorganic powder.
Comparative example 5:
this comparative example differs from the production method described in example 5 only in that, in step (2), the diluent is obtained by mixing paraffin wax and water in a weight ratio of 3: 7.
Experimental example:
modified lignin and adhesive products were prepared according to the preparation methods described in examples 1-5 and comparative examples 1-5, and the performance tests of the modified lignin and the adhesive were performed according to the following methods, with the specific results shown in table 1:
1. and (3) lignin structure determination:
(1) the phenolic hydroxyl group content of lignin was determined according to the following literature: wu Bao, Zhao Julan, Du Jing Bin. differential ultraviolet spectroscopy to determine the content of the phenolic hydroxyl group of lignin [ J ]. proceedings of northeast university of forestry, 1993, 02 (21), 58-65;
(2) the molecular weight and molecular weight distribution of lignin were determined by Waters 1515/2414 gel permeation chromatography, with the column temperature maintained at 40 ℃ and a flow rate of 1 ml/min, using three Waters columns in series (Styragel HR1, HR3 and HR 4), DMF as the mobile phase, polystyrene as standard from German PSS (Mp = 246000, 184000, 120000, 44200, 18200, 9890, 6520, 2770, 890, 474, 370, PDI < 1.20);
(3) the glass transition temperature of the lignin was determined by differential scanning calorimetry Q20 from TA, measured at N2In the atmosphere, the temperature was raised at a rate of 10 ℃/min.
2. Determination of the adhesive Properties:
the adhesive amount of the adhesive is 11.5% of the weight of the wood shavings, and the shaving boards with the thickness of 18 +/-1 mm are prepared according to the production flow of a standard bearing type shaving board (P3). The static flexural strength (MOR), modulus of elasticity (MOE), cohesive strength in the dry state and the swelling rate at 24-hour water absorption thickness of the product were determined according to the national standards for particle boards.
TABLE 1 modified Lignin Structure and adhesive product Performance results obtained by different preparation methods
The data show that the adhesive prepared by the method can obtain better technical effect in the using process, is more uniformly mixed with the shaving board, and improves the product performance of the shaving board.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A preparation method of biomass-based modified aldehyde-free environment-friendly artificial board adhesive is characterized by comprising the following steps: the method comprises the following steps:
(1) uniformly mixing lignin and lanthanum niobate to obtain a mixture, wherein the weight ratio of the lignin to the lanthanum niobate is 100 (0.2-1), then filling the mixture into a transparent PE film packaging bag which can be vacuumized, spreading the mixture into a thin layer with the thickness of 1.5 cm-2 cm, sealing and vacuumizing the thin layer, and then performing irradiation treatment on the mixture according to the irradiation dose of 45-75 kGy by taking cobalt 60 as a radiation source; transferring the mixture subjected to irradiation treatment into a clean workshop with positive pressure, removing the PE film, spraying sterilized deionized water into the mixture, wherein the weight of the deionized water is 10-15% of that of the lignin, then adding lignin degrading enzyme, uniformly mixing, and then placing at 25-35 ℃ for 48-72 hours to obtain modified lignin, wherein the weight ratio of the lignin to the lignin degrading enzyme is 500 (1-2);
(2) weighing the following components in parts by weight: 100 parts of MDI glue, 15-25 parts of modified lignin, 5-12 parts of inorganic powder and 3-8 parts of diluent; and sequentially adding the biomass-based modified aldehyde-free environment-friendly artificial board adhesive into a drum-type glue mixer, stirring at the speed of 100r/min for 5-10 min to obtain the biomass-based modified aldehyde-free environment-friendly artificial board adhesive, and uniformly mixing the biomass-based modified aldehyde-free environment-friendly artificial board adhesive with a particle board within 30min to finish gluing.
2. The preparation method of the biomass-based modified aldehyde-free environment-friendly artificial board adhesive according to claim 1, which is characterized by comprising the following steps: the lignin comprises any one of alkali lignin, acid soluble lignin, Klason lignin, thiolignin, sodium lignosulfonate and calcium lignosulfonate.
3. The preparation method of the biomass-based modified aldehyde-free environment-friendly artificial board adhesive according to claim 1, which is characterized by comprising the following steps: the lanthanum niobic acid is of a lamellar structure, and the structural molecular formula is HLaNb2O7。
4. The preparation method of the biomass-based modified aldehyde-free environment-friendly artificial board adhesive according to claim 1, which is characterized by comprising the following steps: the lignin degrading enzyme is a composite enzyme obtained by mixing lignin peroxidase and laccase, and the weight ratio of the lignin peroxidase to the laccase in the composite enzyme is (1-3): 1.
5. The preparation method of the biomass-based modified aldehyde-free environment-friendly artificial board adhesive according to claim 1, which is characterized by comprising the following steps: the inorganic powder is talc tailings with the grain size of 400-600 meshes, the talc tailings contain more than 20wt% of talc, and the talc tailings also contain one or more of dolomite, quartz, chlorite and calcite.
6. The preparation method of the biomass-based modified aldehyde-free environment-friendly artificial board adhesive according to claim 1, which is characterized by comprising the following steps: the diluent is formed by mixing propylene glycol, diethylene glycol, paraffin and water, and the weight ratio of the propylene glycol to the diethylene glycol to the paraffin to the water is 1:2:2: 5.
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