Impregnating compound for wood infiltration sealing, infiltration sealing material and wood sealing process

Abstract

According to the impregnating compound for wood infiltration sealing, the infiltration sealing material and the wood sealing process, firstly, the impregnating compound for wood infiltration sealing is subjected to a reaction of polyisocyanate and hydrophilic polyol to obtain an-NCO-terminated isocyanate-polyol prepolymer, and then a hydroxyl acrylate monomer is added for a reaction to prepare an acrylate double-bond terminated product. The wood infiltration sealing material comprises an acrylate monomer, a reactive impregnating compound, an oxygen blocking agent, a reactive organic silicon monomer, an oxidizing agent, a reducing agent, an accelerant, a polymerization inhibitor and a stabilizer, wherein the oxygen blocking agent is obtained by reacting oxidized paraffin and a hydroxyl acrylate monomer. The wood is cured at room temperature after being cleaned, dried, infiltrated and drained. The reactive impregnating compound and the oxygen blocking agent can chemically react with monomers in the sealing material to form a compact three-dimensional polymerization network, the oxygen blocking agent can enable the sealing material to be subjected to anaerobic curing at room temperature, the phenomenon that the sealing material overflows due to high-temperature curing is avoided, and the wood is good in performance and long in service life.

Description

Technical Field

[0001] This invention relates to the field of wood treatment technology, specifically to impregnating sealants, impregnating sealants, and wood sealing processes. Background Technology

[0002] As an important supplementary resource to natural forests, my country's commercial timber industry based on fast-growing plantations has developed rapidly. However, due to its loose texture, susceptibility to cracking and deformation, and poor resistance to decay, the application of fast-growing timber is limited. Currently, most tree species are only suitable for the engineered wood products and paper industries with lower material requirements. Through a series of modification technologies, physical and chemical treatments of wood can improve and overcome defects such as large shrinkage and swelling due to moisture, poor dimensional stability, easy discoloration, flammability, poor decay resistance, and poor wear resistance in plantation timber. At the same time, it can endow wood with certain special functions, upgrading low-grade timber, effectively utilizing timber, and extending its service life.

[0003] Patent application number 201911000876.5 discloses a bio-based rigid monomer for improving fast-growing timber. The preparation method is as follows: isoborneol methacrylate is dissolved in anhydrous ethanol, and an initiator is added to prepare an impregnation solution; fast-growing timber is placed in the impregnation solution and subjected to vacuum impregnation and room temperature / normal pressure impregnation sequentially before being removed; the removed fast-growing timber is placed in an oven for drying, and after drying, it undergoes curing treatment to obtain isoborneol methacrylate modified material. Patent application number 202210539960.X discloses a plastic-compressed timber, prepared as follows: timber is impregnated in a treatment solution under negative pressure to obtain impregnated timber; the impregnated timber is dried to obtain dried timber; the dried timber is placed in a hot press for hot compression treatment, followed by heat preservation treatment and cooling treatment to obtain plastic-compressed timber.

[0004] The above-mentioned wood requires high-temperature curing during the treatment with organic impregnation sealant, which consumes a lot of energy and creates a poor production environment. Furthermore, the viscosity of the organic impregnation sealant decreases at high temperatures, making it easy for it to flow out of the wood's capillaries, resulting in a poor sealing effect.

[0005] Traditional wood impregnation sealants use a mixture of a single acrylate monomer and an unmodified sizing agent to penetrate the wood under vacuum and pressure. The main function of the sizing agent is to reduce the surface tension of the acrylate monomer, making it easier to penetrate the wood's micropores. However, the molecular structure of traditional sizing agents differs significantly from that of acrylate monomers, resulting in poor compatibility. During penetration, the wood's microporous structure easily leads to stratified penetration, essentially forming phase separation and limiting the penetration effect. Furthermore, after the acrylate monomer polymerizes, traditional sizing agent molecules cannot participate in free radical reactions and exist as small molecules within the polymer network, acting as plasticizers and reducing mechanical strength and durability.

[0006] This invention proposes an impregnating agent, an impregnating sealing material, and a wood sealing process for wood impregnation and sealing, aiming to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0007] A wood impregnation and sealing sizing agent, wherein the sizing agent is a reactive sizing agent, and the reactive sizing agent is a product containing acrylate double bond end-capping obtained by the addition reaction of hydroxy acrylate monomer and isocyanate-polyol prepolymer with isocyanate-hydroxyl group (carbamate reaction); wherein the isocyanate-polyol prepolymer is a -NCO end-capping product obtained by the addition reaction of polyisocyanate and hydrophilic polyol with isocyanate-hydroxyl group (carbamate reaction).

[0008] Preferably, the wood impregnation and sealing sizing agent is prepared by the following method: first, the polyisocyanate is added to the reaction vessel, then the hydrophilic polyol is added dropwise. After the hydrophilic polyol is added, the temperature is maintained until the reaction is completed, generating the isocyanate-polyol prepolymer with -NCO group end-capping. Then, the hydroxy acrylate monomer (with an appropriate amount of polymerization inhibitor pre-added to prevent the hydroxy acrylate monomer from undergoing thermal polymerization) is added to the reaction vessel, and the temperature is maintained until the reaction is completed. After cooling to room temperature, a reactive sizing agent containing acrylate double bond end-capping is obtained.

[0009] Preferably, in the preparation method of the wood impregnation and sealing sizing agent, the reaction temperature of the polyisocyanate and the hydrophilic polyol is controlled at 40℃~110℃, and the temperature is maintained for 1~3 hours after the hydrophilic polyol is added until the reaction is complete; the reaction temperature of the hydroxy acrylate monomer and the isocyanate-polyol prepolymer is controlled at 120℃~200℃, and the temperature is maintained for 2~7 hours until the reaction is complete.

[0010] Preferably, the wood impregnation and sealing agent contains a polyisocyanate such as diisocyanate, triisocyanate, tetraisocyanate, etc., and a hydrophilic polyol such as a hydrophilic diol, hydrophilic triol, or hydrophilic tetraol. When the hydrophilic diol or diisocyanate is added to the reactor, the amount added conforms to formula (1), and the amount of the hydroxyacrylate monomer added to the reactor conforms to formula (2).

[0011] Formula (1)

[0012] In formula (1), It refers to the mass of the hydrophilic diol; It is the molar ratio of -NCO to -OH, a constant between 1.5 and 2; It is the mass of diisocyanate; It is the relative molecular weight of diisocyanate; It is the average molecular weight of a hydrophilic diol;

[0013] Formula (2)

[0014] In formula (2), It is the mass of the hydroxyacrylate monomer; The values ​​are the same as those in formula (1); It is the mass of diisocyanate; It is the relative molecular weight of diisocyanate;

[0015] It is the relative molecular weight of hydroxyacrylate monomer.

[0016] During the preparation of impregnating sealant for wood, when The preparation process of the isocyanate-polyol prepolymer is as follows:

[0017]

[0018] When the hydroxyacrylate is hydroxypropyl methacrylate, the reaction is as follows:

[0019]

[0020] A wood impregnation sealant comprises 100 parts by weight of acrylate monomer, 3-5 parts by weight of the above-mentioned reactive wetting agent, 1-3 parts by weight of oxygen barrier agent, 1-3 parts by weight of reactive organosilicon monomer, 0.2-1 parts by weight of oxidant, 0.2-1 parts by weight of reducing agent, 0.2-1 parts by weight of accelerator, 0.1-0.3 parts by weight of polymerization inhibitor, and 0.05-0.2 parts by weight of stabilizer. The above components are stirred and mixed evenly at room temperature to obtain an organic wood impregnation sealant.

[0021] Preferably, in the wood impregnation sealing material, the oxygen barrier agent is a reactive oxygen barrier agent, and the preparation method of the reactive oxygen barrier agent is as follows: 100 parts by weight of paraffin oxide, 10-20 parts by weight of hydroxy acrylate monomer, and 0.1-0.5 parts by weight of polymerization inhibitor are added to a reaction vessel, the temperature is raised to 150℃-180℃, and the reaction is maintained for 1-3 hours to allow the carboxyl groups in the paraffin oxide to undergo an esterification reaction with the hydroxyl groups in the hydroxy acrylate monomer. The vacuum is then slowly increased to remove the water generated in the reaction, and the mixture is cooled to room temperature to obtain the reactive oxygen barrier agent.

[0022] Preferably, in the wood impregnation sealant, the acrylate monomers comprise 30%–60% by mass of monofunctional acrylate monomers, 20%–50% by mass of multifunctional acrylate monomers, and 5%–20% by mass of hydroxyacrylate monomers.

[0023] Preferably, in the wood impregnation sealant, the monofunctional acrylate monomer is one or more of methyl methacrylate, ethyl methacrylate, butyl methacrylate, butyl acrylate, isooctyl methacrylate, isooctyl acrylate, isodecanyl methacrylate, dodecyl methacrylate, tetrahydrofuran methacrylate, cyclohexyl methacrylate, and glycidyl methacrylate; the multifunctional acrylate monomer is one or more of ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, hexanediol diacrylate, 2-butyl-2-ethyl-1,3-propanediol diacrylate, 2-methyl-1,3-propanediol diacrylate, 1,4-butanediol diacrylate, trihydroxypropane triacrylate, and pentaerythritol triacrylate; the hydroxyacrylate monomer is one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate; the reactive organic... The silicon monomer is one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(2-methoxyethoxy)silane, and γ-methacryloyloxypropyltrimethoxysilane; the oxidizing agent is one or more of cumene hydroperoxide, tert-butyl hydroperoxide, dicumene peroxide, dicumene hydroperoxide, and tert-butyl peroxide of benzoate; the reducing agent is N,N-dimethylaniline, dimethyl-p-methylaniline, triethylamine, α-aminopyridine, and tetrahydroquinoline. One or more of the following: the accelerator is one or more of o-benzoylsulfonylimide, o-phthalimide, triphenylphosphine, ascorbic acid, and methacrylic acid; the polymerization inhibitor is one or more of hydroquinone, benzoquinone, naphthoquinone, anthraquinone, 2,6-dibutyl-p-cresol, picric acid, and 4-methoxyphenol; the stabilizer is a heavy metal ion chelating agent, preferably one or more of ethylenediaminetetraacetic acid, ethylene glycol bis(2-aminoethyl ether)tetraacetic acid, sodium glycolate, and 1,10-phenanthroline.

[0024] The wood sealing process involves the following steps: First, clean the boards and then dry them. Then, immerse the poplar boards in the above-mentioned wood impregnation sealant by first applying a vacuum (0.090MPa~0.098MPa) and then applying pressure (0.45MPa~0.6MPa). Drain the boards and wipe off any excess organic impregnation sealant from the surface. Finally, allow the boards to stand at room temperature for 15~36 hours, preferably 24 hours, to complete the impregnation and sealing process.

[0025] The above-mentioned reactive wetting agents, impregnation sealing materials, and sealing processes are applicable to a variety of wood species, including balsa wood such as poplar, eucalyptus, fir, and paulownia.

[0026] Compared with the prior art, the advantages of the technical solution of the present invention are as follows:

[0027] 1. The organic impregnation sealing material of the present invention has low toxicity, does not contain volatile substances, and is suitable for impregnation sealing of wood;

[0028] 2. The organic impregnation sealant of the present invention uses a reactive wetting agent, which reacts chemically with the monofunctional and multifunctional acrylate monomers in the organic impregnation sealant during the curing process to form chemical bonds, resulting in a tight bond with the cured material. It exhibits good thermal stability, water resistance, and solvent resistance, and reduces volume shrinkage. The modified reactive wetting agent can be homogeneously dissolved in the acrylate monomers, resulting in good penetration of the wood impregnation sealant into the wood. During the curing process, the reactive wetting agent participates in free radical reactions, and its molecules enter the polymer network after curing, effectively improving the mechanical strength and durability of the wood.

[0029] 3. The organic impregnation sealant of this invention employs a reactive oxygen barrier agent, which migrates to the surface of the organic impregnation sealant, allowing it to anaerobically cure at room temperature. During curing, the agent chemically reacts with monofunctional and multifunctional acrylate monomers in the organic impregnation sealant, forming chemical bonds and further improving the strength and durability of the wood. This reactive oxygen barrier agent, primarily composed of modified oxidized paraffin, has strong non-polarity. After penetrating the wood, it repels the hydroxyl groups in the wood cellulose, thus migrating to the wood surface and forming a barrier film. This prevents oxygen from inhibiting the free radical polymerization process of the impregnation sealant in the wood. Simultaneously, the double bonds formed after hydroxyl acrylate grafting modification can further participate in the polymerization reaction of the impregnation sealant, further improving the stability of the oxygen barrier film and enhancing the water / solvent resistance of the wood after impregnation and sealing.

[0030] 4. The organic impregnation sealing material of the present invention uses reactive organosilicon monomers, which further improves the water resistance and solvent resistance of the impregnation sealing material;

[0031] 5. The organic impregnation sealant of the present invention adopts a room temperature anaerobic curing system, which can avoid the overflow of organic impregnation sealant during high temperature curing, thereby achieving the purpose of improving the performance and service life of modified wood. Attached Figure Description

[0032] The specific embodiments are further described below with reference to the accompanying drawings, wherein:

[0033] Figure 1 , 2 These are a set of weighing diagrams of wood blocks before and after impregnation in Specific Implementation Example 3 of the present invention;

[0034] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0035] Specific implementation cases 1-5:

[0036] (1) Preparation of reactive wetting agent: A specific mass of hexamethylene diisocyanate was added to a reaction vessel equipped with a stirrer, thermometer and condenser, and heated to 60°C. Then, a specific mass of polyethylene glycol (average relative molecular weight of 1000) was added dropwise over 2 hours. After the addition was completed, the reaction was kept at the temperature for 3 hours. Then, a specific mass of hydroxypropyl acrylate (the hydroxypropyl acrylate was pre-added with the polymerization inhibitor 4-methoxyphenol, and the amount of polymerization inhibitor added was 0.1% of the total mass of the reactive wetting agent) was added. The temperature was maintained at 160°C and the reaction was kept at the temperature for 5 hours. The reactive wetting agent was obtained by cooling to room temperature.

[0037] (2) Preparation of reactive oxygen barrier agents

[0038] Add 100 parts by mass of oxidized paraffin, 15 parts by mass of hydroxypropyl acrylate, and 0.45 parts by mass of 4-methoxyphenol (polymerization inhibitor) to a reaction vessel equipped with a stirrer, thermometer, and condenser. Heat to 160°C and maintain the temperature for 3 hours. Slowly increase the vacuum to remove the water generated in the reaction and cool to room temperature to obtain a reactive oxygen inhibitor.

[0039] (3) Preparation of organic impregnation sealant for wood

[0040] In a reactor equipped with a stirrer, thermometer, and condenser, add 10 parts by mass of ethyl methacrylate, 20 parts by mass of butyl methacrylate, 20 parts by mass of ethylene glycol diacrylate, 30 parts by mass of diethylene glycol diacrylate, 20 parts by mass of hydroxypropyl acrylate, 1 part by mass of vinyltriethoxysilane, 3 parts by mass of the above-mentioned reactive wetting agent, 1 part by mass of the above-mentioned reactive oxygen barrier agent, 0.2 parts by mass of cumene hydroperoxide, 0.2 parts by mass of dimethyl-p-methylaniline, 0.2 parts by mass of o-benzoylsulfonylimide, 0.1 parts by mass of hydroquinone (polymerization inhibitor component), and 0.05 parts by mass of ethylenediaminetetraacetic acid. Stir and mix evenly at room temperature to obtain an organic wood impregnation sealant.

[0041] The amounts of hexamethylene diisocyanate, polyethylene glycol, and hydroxypropyl acrylate added to the reactor used to prepare the reactive wetting agent are shown in the table below:

[0042] Specific Implementation Case 1 Specific Implementation Case 2 Specific Implementation Case 3 Specific Implementation Case 4 Specific Implementation Case 5 Hexamethylene diisocyanate (component A) 100 100 100 100 100 Polyethylene glycol (component B) 595 397 397 296 296 Hydroxypropyl acrylate (component C) 51 51 77 77 38 The molar ratio of component A to component B 1.0 1.5 1.5 2.0 2.0 The molar ratio of component A to component C 1.5 1.5 1.0 1.0 2.0

[0043] Comparison Case 1:

[0044] Preparation of organic impregnation sealant for wood

[0045] In a reactor equipped with a stirrer, thermometer, and condenser, add 10 parts by weight of ethyl methacrylate, 20 parts by weight of butyl methacrylate, 20 parts by weight of ethylene glycol diacrylate, 30 parts by weight of diethylene glycol diacrylate, 20 parts by weight of hydroxypropyl acrylate, 1 part by weight of vinyltriethoxysilane, 3 parts by weight of isooctanol polyoxyethylene ether impregnating agent, 1 part by weight of paraffin barrier agent, 0.2 parts by weight of cumene hydrogen peroxide, 0.2 parts by weight of dimethyl-p-methylaniline, 0.2 parts by weight of o-benzoylsulfonyl imide, 0.1 parts by weight of hydroquinone (polymerization inhibitor component), and 0.05 parts by weight of ethylenediaminetetraacetic acid. Stir and mix evenly at room temperature to obtain an organic wood impregnation sealant.

[0046] Comparison Case 2:

[0047] (1) Preparation of reactive wetting agent: 100 parts by mass of hexamethylene diisocyanate were added to a reaction vessel equipped with a stirrer, thermometer and condenser, and heated to 60°C. Then 296 parts by mass of polyethylene glycol (average relative molecular weight of 1000) were added dropwise over 2 hours. After the addition was completed, the reaction was kept at the temperature for 3 hours. Then 77 parts by mass of hydroxypropyl acrylate (pre-added with 0.473 parts by mass of 4-methoxyphenol, i.e. polymerization inhibitor) were added. The temperature was maintained at 160°C and the reaction was kept at the temperature for 5 hours. The reactive wetting agent was obtained by cooling to room temperature.

[0048] (2) Preparation of reactive oxygen barrier agents

[0049] Add 100 parts by mass of oxidized paraffin, 15 parts by mass of hydroxypropyl acrylate, and 0.45 parts by mass of 4-methoxyphenol (polymerization inhibitor) to a reaction vessel equipped with a stirrer, thermometer, and condenser. Heat to 160°C and maintain the temperature for 3 hours. Slowly increase the vacuum to remove the water generated in the reaction and cool to room temperature to obtain a reactive oxygen inhibitor.

[0050] (3) Preparation of organic impregnation sealant for wood

[0051] In a reactor equipped with a stirrer, thermometer, and condenser, add 10 parts by mass of ethyl methacrylate, 20 parts by mass of butyl methacrylate, 20 parts by mass of ethylene glycol diacrylate, 30 parts by mass of diethylene glycol diacrylate, 20 parts by mass of hydroxypropyl acrylate, 1 part by mass of vinyltriethoxysilane, 3 parts by mass of the above-mentioned reactive wetting agent, 1 part by mass of the above-mentioned reactive oxygen barrier agent, 0.2 parts by mass of cumene hydroperoxide, 0.2 parts by mass of dimethyl-p-methylaniline, 0.2 parts by mass of o-benzoylsulfonylimide, 0.1 parts by mass of hydroquinone (polymerization inhibitor component), and 0.05 parts by mass of ethylenediaminetetraacetic acid. Stir and mix evenly at room temperature to obtain an organic wood impregnation sealant.

[0052] Regarding the specific implementation cases and comparative cases mentioned above, the sealing method for impregnating poplar boards with organic impregnating sealant is as follows: First, clean the poplar boards and then dry them. Then, impregnate the poplar boards with organic impregnating sealant by first applying a vacuum (0.095 MPa) followed by pressure (0.50 MPa). After draining, wipe off any excess organic impregnating sealant from the surface. Specifically, in implementation cases 1-5 and comparative case 1, the impregnated poplar boards were placed at room temperature for 24 hours to complete the impregnation and sealing process. In comparative case 2, the impregnation and sealing of the poplar boards was completed by placing them at 90°C for 24 hours.

[0053] The following operations were performed on the poplar boards after impregnation and sealing in specific implementation cases 1-5 and comparative cases 1 and 2: the weight gain, water absorption, compressive strength along the grain, and corrosion resistance of the impregnated wood were calculated and tested, including:

[0054] I. Viscosity Testing of Organic Impregnating Sealing Materials

[0055] According to "GB / T 10247-2008 Viscosity Measurement Method", the viscosity of organic impregnation sealing materials was tested using a digital rotor viscometer.

[0056] II. Weight gain rate

[0057] Before the experiment, weigh the unimpregnated and sealed rectangular sample. After curing, the samples were processed according to the experimental design and the dry weight of the samples was measured. Calculate the weight gain rate using the following formula. :

[0058]

[0059] III. Water Absorption Rate (Water Resistance Test)

[0060] Before the experiment, weigh the rectangular sample after impregnation and sealing. After immersing the sample in water for 72 hours, remove it, wipe off the liquid droplets on the surface of the sample with filter paper, and weigh the sample. Calculate the water absorption rate using the following formula. :

[0061]

[0062] IV. Compressive strength parallel to the grain

[0063] Before the experiment, the width and thickness of the sealed rectangular sample were measured along the grain direction. The sample was then tested using a UTM-M3241 universal testing machine from Shanghai Baihe Instrument Technology Co., Ltd., at a testing speed of 1 mm / min. The compressive strength along the grain was calculated using the following formula:

[0064]

[0065] For width, For height, The cross-sectional area under pressure (unit: mm2). The maximum load (in N) at which the specimen fails. The compressive strength of wood along the grain (unit: MPa).

[0066] V. Corrosion Resistance

[0067] Before the experiment, weigh the rectangular sample after impregnation and sealing. Immerse it in 40% sodium hydroxide solution for 72 hours, then soak it in deionized water for 24 hours. After washing, dry it in an oven until constant weight, weigh it, and calculate the mass loss rate according to the following formula. :

[0068]

[0069] During the experimental testing, eight repeated trials were conducted, and the average value of the experimental values ​​was taken. The results are as follows:

[0070] Test Project Viscosity (mPa.s) Weight gain rate (%) Water absorption rate (%) Compressive strength parallel to the grain (MPa) Corrosion resistance (%) Specific Implementation Case 1 9.6 37.3 20.8 57.2 3.4 Specific Implementation Case 2 10.1 38.2 18.3 58.5 3.1 Specific Implementation Case 3 10.5 38.7 15.5 59.4 2.9 Specific Implementation Case 4 11.1 41.5 11.3 63.9 2.3 Specific Implementation Case 5 10.7 40.3 12.9 62.2 2.6 Comparison Case 1 7.9 29.2 30.4 40.2 6.3 Comparison Case 2 11.1 37.2 16.8 58.3 3.0

[0071] In specific implementation cases 1-5 and comparative case 2, the reactive impregnating agent involved in this invention was used in the impregnation sealing material. However, in specific implementation cases 1-5, the proportions of diisocyanate, hydrophilic diol, and hydroxy acrylate monomers added in the reaction vessel for preparing the reactive impregnating agent were different, resulting in different concentrations of reactive wetting agent per unit mass. In specific implementation case 4 and comparative case 2, the raw material ratios were the same when preparing the reactive wetting agent, but the latter adopted high-temperature curing in the sealing process.

[0072] The data in the table above shows that the weight gain, compressive strength along the grain, and corrosion resistance of the wood after impregnation and curing in Specific Examples 1-5 are significantly improved compared to Comparative Example 1, which is sufficient to prove that the reactive wetting agent and reactive oxygen barrier agent involved in this invention play an important role in wood impregnation and sealing. Secondly, in Specific Example 4, the concentration of reactive wetting agent is the highest. Although the impregnation viscosity increases accordingly, the vacuum-pressurization process in the sealing process is sufficient to offset the difficulty of the impregnation and sealing material penetration, resulting in the best impregnation and sealing effect. A comparison of the experimental data of Specific Example 4 and Comparative Example 2 shows that, using the same impregnation material, Comparative Example 2, which employs a high-temperature curing and sealing process, shows worse experimental data.

[0073] Organic impregnation sealants are liquid before curing. Wood has capillaries, so the impregnation material easily penetrates the wood. Figure 1 , 2It can be seen that the wood in Implementation Case 3 showed a significant increase in weight after impregnation and curing (the weight gain rate of other specific implementation schemes is not shown in the attached figure). Figure 1 , 2 (A simple demonstration of the wood weight gain effect). After curing, the impregnated material forms a solid with a three-dimensional network cross-linked structure: This is because the present invention utilizes reactive wetting agents, reactive oxygen barrier agents, and reactive organosilicon monomers to chemically react with monomers in the organic impregnation and sealing material during the curing process, forming dense cross-linked chemical bonds, which improves the longitudinal compressive strength, water resistance, and corrosion resistance of the impregnated wood; the present invention utilizes a room temperature anaerobic curing system, avoiding the overflow of organic impregnation and sealing material during high-temperature curing (as can be seen from the data in specific implementation case 4 and comparative case 2), improving the wood weight gain rate, modifying wood properties, and extending service life.

[0074] In the above specific implementation cases 1 to 5, the types of sealing materials are the same, and the amounts of other components are the same except for the content of reactive sizing agent. The experimental data shows that the reactive sizing agent of the present invention plays an important role in the sealing of wood. However, this is not a limitation on the types and amounts of each component, but only to meet the comparison needs of a single variable. During the experimental verification stage, the inventors used multiple components and multiple ratios within the scope of the specification. The experimental results are similar to those in the table above. Due to space limitations, they are not shown one by one.

[0075] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A wood impregnation and sealing agent, characterized in that: The wetting agent is a reactive wetting agent, which is a product containing acrylate double bonds obtained by urethane ester monomers and isocyanate-polyol prepolymers; wherein, the isocyanate-polyol prepolymer is a -NCO-terminated product obtained by urethane esterification of polyisocyanates and hydrophilic polyols; the polyisocyanate is diisocyanate, triisocyanate, tetraisocyanate, etc., and the hydrophilic polyol is hydrophilic... Aqueous diols, hydrophilic triols, hydrophilic tetraols...; when the hydrophilic polyol is a hydrophilic diol, the hydrophilic diol is one or more of polyethylene glycol and polypropylene glycol; when the polyisocyanate is a diisocyanate, the diisocyanate is one or more of hexamethylene diisocyanate, isoflurane diisocyanate, phenyl diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, toluene diisocyanate, and diphenylmethane diisocyanate.

2. The wood impregnation and sealing agent as described in claim 1, characterized in that: In preparing the reactive wetting agent, the polyisocyanate is first added to the reaction vessel, followed by the addition of the hydrophilic polyol. After the hydrophilic polyol is added, the temperature is maintained until the reaction is complete, generating an isocyanate-polyol prepolymer with -NCO group-terminated ends. Then, the hydroxy acrylate monomer mixed with a polymerization inhibitor is added to the reaction vessel, and the temperature is maintained until the reaction is complete. After cooling to room temperature, a reactive wetting agent containing acrylate double bond-terminated ends is obtained.

3. The wood impregnation and sealing agent as described in claim 2, characterized in that: During the preparation of the reactive wetting agent, the reaction temperature of the polyisocyanate and the hydrophilic polyol is controlled at 40℃~110℃, and after the hydrophilic polyol is added, the temperature is maintained for 1~6 hours until the reaction is complete; the reaction temperature of the hydroxy acrylate monomer and the isocyanate-polyol prepolymer is controlled at 120℃~200℃, and the temperature is maintained for 2~7 hours until the reaction is complete.

4. The wood impregnation and sealing agent as described in claim 1, characterized in that: When the polyisocyanate is a diisocyanate and the hydrophilic polyol is a hydrophilic diol, the amount of hydrophilic diol and diisocyanate added conforms to formula (1), and the amount of hydroxy acrylate monomer added to the reactor conforms to formula (2). Formula (1) In formula (1), It refers to the mass of the hydrophilic diol; It is the molar ratio of -NCO to -OH, a constant between 1.5 and 2; It is the mass of diisocyanate; It is the relative molecular weight of diisocyanate; It is the average molecular weight of a hydrophilic diol; Official (2) In formula (2), It is the mass of the hydroxyacrylate monomer; The values ​​are the same as those in formula (1); It is the mass of diisocyanate; It is the relative molecular weight of diisocyanate; It is the relative molecular weight of hydroxyacrylate monomer.

5. A wood-impregnated sealant, characterized in that: It comprises 100 parts by weight of acrylate monomer, 3 to 5 parts by weight of the reactive wetting agent as described in any one of claims 1 to 4, 1 to 3 parts by weight of oxygen barrier agent, 1 to 3 parts by weight of reactive organosilicon monomer, 0.2 to 1 parts by weight of oxidant, 0.2 to 1 parts by weight of reducing agent, 0.2 to 1 parts by weight of accelerator, 0.1 to 0.3 parts by weight of polymerization inhibitor, and 0.05 to 0.2 parts by weight of stabilizer.

6. The wood impregnation sealant as described in claim 5, characterized in that: In preparing the oxygen barrier agent, 100 parts by weight of paraffin oxide, 10-20 parts by weight of hydroxy acrylate monomer, and 0.1-0.5 parts by weight of polymerization inhibitor are first added to a reaction vessel. The temperature is raised to 150℃-180℃ and maintained for 1-3 hours to allow the carboxyl groups in the paraffin oxide to undergo an esterification reaction with the hydroxyl groups in the hydroxy acrylate monomer. The vacuum is then slowly increased to remove the water generated in the reaction. The mixture is then cooled to room temperature to obtain the reactive oxygen barrier agent. The polymerization inhibitor is one of hydroquinone, benzoquinone, naphthoquinone, anthraquinone, 2,6-dibutyl-p-cresol, picric acid, and 4-methoxyphenol.

7. The wood impregnation sealant as described in claim 5, characterized in that: The acrylate monomers comprise 30%–60% by mass of monofunctional acrylate monomers, 20%–50% by mass of multifunctional acrylate monomers, and 5%–20% by mass of hydroxyl acrylate monomers; the monofunctional acrylate monomers are methyl methacrylate, ethyl methacrylate, butyl methacrylate, butyl acrylate, isooctyl methacrylate, isooctyl acrylate, isodecanyl methacrylate, dodecyl methacrylate, tetrahydrofuran methacrylate, cyclohexyl methacrylate, and glycidyl methacrylate. One or more of the following: the multifunctional acrylate monomer is one or more of ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, hexanediol diacrylate, 2-butyl-2-ethyl-1,3-propanediol diacrylate, 2-methyl-1,3-propanediol diacrylate, 1,4-butanediol diacrylate, trihydroxypropane triacrylate, and pentaerythritol triacrylate; the hydroxyacrylate monomer is one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate.

8. The wood impregnation sealant as described in claim 5, characterized in that: The reactive organosilicon monomer is one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(2-methoxyethoxy)silane, and γ-methacryloyloxypropyltrimethoxysilane; the oxidant is one of cumene hydroperoxide, tert-butyl hydroperoxide, dicumyl peroxide, dicumyl peroxide, and tert-butyl peroxide of benzoate; the reducing agent is one of N,N-dimethylaniline, dimethyl-p-methylaniline, triethylamine, α-aminopyridine, and tetrahydroquinoline; the accelerator is one of o-benzoylsulfonylimide, o-phthalimide, triphenylphosphine, ascorbic acid, and methacrylic acid; and the stabilizer is a heavy metal ion chelating agent.

9. Wood sealing process, characterized by: First, clean the board, then dry the board. Immerse the board with the impregnation and sealing material described in claim 5 by first vacuuming and then pressurizing. Drain the board, then wipe off the excess organic impregnation and sealing material on the surface. Finally, place the board at room temperature to complete the impregnation and sealing of the poplar board.

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