TWI506106B - Wood adhesive, method for bonding wood materials using the same, and composite wood structure using the same - Google Patents

Description

Wood adhesive and wood adhesion method and wood joint structure using same

The present specification relates to an adhesive and an adhesive method and joint structure using the same, and more particularly to a wood adhesive and a wood adhesion method and a wood joint structure using the same.

Wood adhesives are the most widely used of many adhesives and are used in more than half of the total use. Among them, more than 80% of the wood adhesive includes at least one of a urea-formaldehyde resin and a phenolic-formaldehyde resin as a main component. However, such resins will continue to release formaldehyde gas due to their hardening mechanism, which may even last for more than a decade. Therefore, the environment will be polluted and human health will be affected. Therefore, it is a trend to solve the problem of formaldehyde release and environmental pollution of wood adhesives.

In the present specification, a wood adhesive using a raw material is proposed. The biomaterial used is a cellulose derivative. In the present specification, a wood adhesion method and a wood joint structure using the wood adhesive are also proposed.

According to an embodiment, the wood adhesive comprises a first agent and a second agent. The first agent comprises sodium carboxymethyl cellulose having a molecular weight of from about 15,000 to about 500,000 and a degree of substitution of from about 0.4 to about 2.00. The second agent comprises a polymeric quaternary amine.

According to an embodiment, the wood adhesion method comprises the following steps. First, a first wooden block and a second wooden block are provided. Next, the first wood block and the second wood block are joined by a wood adhesive, wherein the wood adhesive comprises a first agent and a second agent, and the first agent comprises a molecular weight of about 15,000 to 500,000 and a degree of substitution of about 0.4 to 2.00. The sodium carboxymethyl cellulose salt, the second agent comprises a quaternary amine salt polymer.

According to an embodiment, the wood joint structure includes a first wooden block, a second wooden block, and an adhesive layer. The adhesive layer joins the first wooden block and the second wooden block. The adhesive layer is formed by mixing a first agent and a second agent of a wood adhesive and hardening the wood adhesive, wherein the first agent of the wood adhesive comprises a molecular weight of about 15,000 to 500,000, and the degree of substitution is about The sodium carboxymethylcellulose salt of 0.4 to 2.00, the second agent of the wood adhesive comprises a quaternary amine salt polymer.

In order to better understand the above and other aspects of the present invention, several embodiments and examples are specifically described below as follows:

This specification proposes a wood adhesive using a cellulose derivative. The structure of the cellulose derivative is represented by Chemical Formula 1, wherein R is H or CH ₂ CO ₂ Na, and n is an integer.

According to an embodiment, the wood adhesive comprises a first agent and a second agent. The first agent and the second agent may be stored separately and mixed until they are used, but are not limited thereto.

The first dose can be the main agent. The first agent comprises sodium carboxymethyl cellulose having a molecular weight of from about 15,000 to about 500,000 and a degree of substitution of from about 0.4 to about 2.00. Here, the "degree of substitution" is defined as the average number of carboxymethyl groups per glucose unit of cellulose. In some embodiments, the first agent may further comprise water in the aqueous phase, while the sodium carboxymethyl cellulose is present in the aqueous phase, but is not limited thereto.

The second agent can be a hardener. The second agent includes a polymeric quaternary amine. In some embodiments, the quaternary amine salt polymer can be a quaternary amine salt polymer formed by reacting polyamidoamine with epichlorohydrin. The quaternary amine salt polymer has a unit represented by Chemical Formula 2, wherein m is an integer.

[Chemical Formula 2] In some embodiments, the second agent may further comprise water in the aqueous phase, while the quaternary amine salt polymer is present in the aqueous phase, but is not limited thereto.

In some embodiments, the wood adhesive can also include a variety of additives. For example, the wood adhesive may further include at least one of a filler and a flame resistant agent. The filler can include at least one of starch and wood chips. These additives may be added to the first or second agent or may be added after the wood adhesive is mixed. In some embodiments, the pH of the wood adhesive can be adjusted such that the pH of the wood adhesive is between about 2 and 12. For example, the pH of the mixed wood adhesive can be adjusted, but is not limited thereto.

The wood adhesive according to the above embodiment uses the raw material as the main agent, so there is no problem of formaldehyde release, and it is not affected by the shortage of petrochemical materials.

The wood adhesive according to the above embodiment is a cellulose derivative. Compared to the commonly used soy protein, which is the most widely used raw material, cellulose derivatives are more abundant in nature and do not need to be obtained from food crops. Therefore, the wood adhesive according to the above embodiment has manufacturing and economic advantages. Further, the wood adhesive according to the above embodiment has an advantage of being less prone to spoilage and no soy odor than the wood adhesive using soy protein.

A wood bonding method of a wood adhesive according to any of the above embodiments may include providing a first wood block and a second wood block, and joining the first wood block and the second wood block with a wood adhesive. For example, the wood adhesive may include a first agent and a second agent, and the first agent includes sodium carboxymethyl cellulose having a molecular weight of about 15,000 to 500,000 and a degree of substitution of about 0.4 to 2.00, and a second agent. A quaternary amine salt polymer is included.

Specifically, the first wooden block and the second wooden block may be pretreated, for example, heated and maintained for a period of time to remove moisture, essential oils, volatiles, and the like, and to kill eggs. The first agent and the second agent may be mixed when it is intended to join the first wood block and the second wood block. In some embodiments, the mixing ratio of the first agent to the second agent may be from about 0.25:1 to 1:0.1 or from about 0.7:1 to 1:0.2. Then, the mixed wood adhesive is covered (for example, covered by coating) on the surface of the first wooden block and the second wooden block to be joined, and the surface of the two wooden blocks to be joined may be covered with the wood adhesive. It is also possible to cover the wood adhesive only on the surface of one of the blocks to be joined. After that, the wood adhesive can be pressed to harden it. In some embodiments, it may be pressurized at a temperature of about 5 ° C to 45 ° C, a pressure of about 10 kg / cm ² , a pressurization time of about 10 to 30 minutes, and then a pressure of about 90 ° C to 230 ° C. The pressure is about 10 kg/cm ² and the pressurization time is about 3 to 25 minutes to accelerate the hardening of the wood adhesive.

Hardening of wood adhesives according to embodiments includes a variety of reaction mechanisms. One is a cross-link of the quaternary amine salt polymer itself, which upon cross-linking can form a product of formula 3 wherein R' is a quaternary amine salt polymer as described herein.

[Chemical Formula 3] One is a quaternary amine salt polymer which reacts with the hydroxyl group of the sodium carboxymethyl cellulose, the hydroxyl group of the cellulose in the first wood block or the hydroxyl group of the cellulose in the second wood block to form an -O-linkage, such as It is represented by Chemical Formula 4, wherein R" is sodium carboxymethylcellulose or cellulose or the like.

Further, the quaternary amine salt polymer reacts with the carboxylate anion of the sodium carboxymethyl cellulose to form a -COO-linkage, and the product is represented by the chemical formula 5, wherein R''' is a sodium carboxymethyl cellulose salt. .

Since the wood block and the wood adhesive according to the embodiment are connected to each other by a plurality of reaction mechanisms, good joint characteristics can be obtained by the wood adhesion method according to the embodiment.

In some embodiments, at least one of the first wood block and the second wood block comprises a particle board, an oriented strand board, a fiberboard, a plywood, a block board. And at least one of the laminates. In some embodiments, the first and second agents of the wood adhesive can be in the form of an aqueous phase. In some embodiments, the wood adhesive can also include a variety of additives. For example, the wood adhesive may further include at least one of a filler and a flame resistant agent. In some embodiments, the wood adhesive may have a pH of from about 2 to 12, or from about 3 to 11.53.

The wood joining structure using the wood adhesive according to any of the above embodiments may be joined using the wood bonding method according to any of the above embodiments. According to an embodiment, the wood joined structure may include a first wooden block, a second wooden block, and an adhesive layer joining the first wooden block and the second wooden block. The adhesive layer is formed by mixing the first and second agents of the wood adhesive according to any of the above embodiments and hardening the wood adhesive. For example, the wood adhesive may include a first agent and a second agent, and the first agent includes sodium carboxymethyl cellulose having a molecular weight of about 15,000 to 500,000 and a degree of substitution of about 0.4 to 2.00, and a second agent. A quaternary amine salt polymer is included. The wood adhesive according to the embodiment can provide good joint characteristics of the wood joint structure. In some embodiments, at least one of the first block and the second block comprises at least one of a particle board, an oriented strand board, a fiberboard, a plywood, a wood core board, and a laminate.

Various embodiments have been provided so far for the description of wood adhesives, wood adhesion methods, and wood joint structures. In order to make the wood adhered according to the embodiment The agent, the wood adhesion method and the wood joint structure are more clear and easy to understand. Several examples are given below, and a more detailed description will be given in conjunction with the comparative examples.

Preparation of aqueous solution 1 as the first agent

[Carboxymethylcellulose sodium salt solution 1-1]

Provide four reaction bottles. 880 grams of deionized water was added to it. Further, 120 g of sodium carboxymethylcellulose (C5678, SIGMA-ALDRICH) having a molecular weight of 90,000 and a degree of substitution of 0.65 to 0.9 was slowly added. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, 12 wt% (% by weight) of aqueous carboxymethylcellulose sodium salt 1-1 was obtained, hereinafter referred to as aqueous solution 1-1.

[Carboxymethylcellulose sodium salt solution 1-2]

Provide four reaction bottles. 62.7 grams of deionized water was added to it. Further, 937 g of sodium carboxymethylcellulose (C4888, SIGMA-ALDRICH) having a molecular weight of 250,000 and a degree of substitution of 0.7 was slowly added. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, a 6.27 wt% aqueous solution of carboxymethylcellulose sodium salt 1-2 was obtained, hereinafter referred to as aqueous solution 1-2.

[Carboxymethylcellulose sodium salt solution 1-3]

Provide four reaction bottles. 40 grams of deionized water was added to it. Slowly add 960 grams of sodium carboxymethylcellulose (C5013, SIGMA-ALDRICH), It has a molecular weight of 700,000 and a degree of substitution of 0.65 to 0.85. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, 4% by weight of aqueous solution 1-3 of sodium carboxymethylcellulose was obtained, hereinafter referred to as aqueous solution 1-3.

[Carboxymethylcellulose sodium salt aqueous solution 1-4]

Provide four reaction bottles. 100 grams of deionized water was added to it. 900 g of sodium carboxymethylcellulose (PR, First Industrial Pharmaceuticals) was added slowly, having a molecular weight of 47,000 and a degree of substitution of 0.6 to 0.7. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, 10% by weight of aqueous solution 1-4 of sodium carboxymethylcellulose was obtained, hereinafter referred to as aqueous solution 1-4.

[Carboxymethylcellulose sodium salt aqueous solution 1-5]

Provide four reaction bottles. 120 grams of deionized water was added to it. Further, 880 g of sodium carboxymethylcellulose (7A, First Industrial Pharmaceutical Co., Ltd.) having a molecular weight of 27,000 to 33,000 and a degree of substitution of 0.7 to 0.8 was slowly added. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, a 12 wt% aqueous solution of carboxymethylcellulose sodium salt 1-5 was obtained, hereinafter referred to as aqueous solution 1-5.

[Carboxymethylcellulose sodium salt solution 1-6]

Provide four reaction bottles. 120 grams of deionized water was added to it. again 880 g of sodium carboxymethylcellulose (6A, First Industrial Pharmaceuticals) having a molecular weight of less than 27,000 and a degree of substitution of 0.7 to 0.8 was slowly added. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, a 12% by weight aqueous solution of carboxymethylcellulose sodium salt 1-6 was obtained, hereinafter referred to as aqueous solution 1-6.

[Carboxymethylcellulose sodium salt solution 1-7]

Provide four reaction bottles. 107 grams of deionized water was added to it. Further, 893 g of sodium carboxymethylcellulose (PL-15, First Industrial Pharmaceutical Co., Ltd.) was added slowly, and the degree of substitution was 0.45 to 0.55. The reaction flask was placed in an oil bath controlled at 50 ° C, and stirred and dissolved at a speed of 250 rpm for a period of 24 hours or longer. After cooling, 10.7 wt% of aqueous sodium carboxymethylcellulose solution 1-7 was obtained, hereinafter referred to as aqueous solution 1-7.

Preparation of aqueous solution 2 as a second agent

Polyammineamine-epichlorohydrin resin (Kymene® 557H, Hercules) was used, which was a 12.5% by weight aqueous solution having a pH of about 4, hereinafter referred to as aqueous solution 2.

Test on the ratio of the aqueous solution 1 as the first agent to the aqueous solution 2 as the second agent

[Example 1]

1.0 g of an aqueous solution 1-1 and 3.0 g of an aqueous solution 2 were uniformly stirred to prepare a wood adhesive 1. Applying the wood adhesive 1 between two wood chips, wherein The wood chip has a strip shape of 10 cm × 1 cm to facilitate the subsequent use of the tensile test of the double-column tensile testing machine, and the coating area is 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature (for example, 25 ° C) for 24 hours, and then naturally dried at room temperature for two days before the tensile test. The tensile test was carried out with a two-column tensile tester (Guangyi Instrument Co., Ltd.).

[Example 2]

Take 2.0 g of aqueous solution 1-1 and 2.0 g of aqueous solution 2 and mix well to prepare wood adhesive 2. The wood adhesive 2 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate the subsequent tensile test with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then naturally dried at room temperature for two days before the tensile test was performed.

[Example 3]

3.0 g of an aqueous solution 1-1 and 1.0 g of an aqueous solution 2 were uniformly stirred to prepare a wood adhesive 3. The wood adhesive 3 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. Wood chips are stacked and then subjected to a pressure of 200 psi at 120 ° C The wood adhesive was hardened by pressurization for 20 minutes to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then naturally dried at room temperature for two days before the tensile test was performed.

[Comparative Example 1]

The aqueous solution 2 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then naturally dried at room temperature for two days before the tensile test was performed.

[Comparative Example 2]

The aqueous solution 1-1 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature (for example, 25 ° C) for 24 hours, and then naturally dried at room temperature for two days before the tensile test.

[Test Results]

The test results of the above examples and comparative examples are listed in Table 1. Among them, the "proportion of raw materials" means that the raw materials (in this and most of the following examples, comparative examples are sodium carboxymethylcellulose, and in some comparative examples, soy protein) accounted for the total weight. proportion. The result of the partial tensile test is greater than a certain value, meaning that the wood break occurs when the tensile force is this value, and the tensile force required to separate the adhesive cannot be tested. It can be seen that only aqueous solution 1-1 (i.e., aqueous solution of a quaternary amine salt polymer as a second agent is not used) or only aqueous solution 2 is used (i.e., carboxymethylcellulose is not used as the first agent). Neither the sodium salt solution) gave a good bonding effect. In contrast, with the wood adhesive according to the example, a good bonding effect can be obtained over a wide range of ratios. Moreover, even in the case of water immersion for 24 hours, a good bonding effect can be obtained by using the wood adhesive according to the example, which also proves that the wood adhesive according to the examples and the examples also has a certain moisture resistance.

[Example 4]

Take 2.0 g of aqueous solution 1-2 and 1.0 g of aqueous solution 2 and mix well to prepare wood adhesive 4. The wood adhesive 4 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then naturally dried at room temperature for two days before the tensile test was performed.

[Example 5]

Take 6.0 g of aqueous solution 1-2 and 1.0 g of aqueous solution 2 and mix well to prepare wood adhesive 5. The wood adhesive 5 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then naturally dried at room temperature for two days before the tensile test was performed.

[Comparative Example 3]

Applying the aqueous solution 1-2 between two wood chips, wherein the wood chips are 10 The length of the strip × 1 cm is used to facilitate the subsequent tensile test with a coating area of 1 cm ^ 2 . After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then naturally dried at room temperature for two days before the tensile test was performed.

[Test Results]

The test results of the above examples and comparative examples are listed in Table 2. The result of some of the tensile tests is greater than a certain value, which means that the wood breaks when the tensile force is at this value, and the tensile force required to separate the adhesive cannot be tested. It can be seen that only the aqueous solution 1-2 (i.e., the aqueous solution of the quaternary amine salt polymer as the second agent is not used) or only the aqueous solution 2 is used (i.e., the carboxymethyl cellulose is not used as the first agent). Neither the sodium salt solution) gave a good bonding effect. In contrast, using the wood adhesive according to the example, a good bonding effect can be obtained in various ratio ranges. Further, even in the case of being immersed in water for 24 hours, a good bonding effect can be obtained by using the wood adhesive according to the example, which proves that the wood adhesive according to the examples and the examples also has a certain moisture resistance.

Test on the pH of wood adhesives

[Example 6]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2, and 0.88 g of an aqueous hydrochloric acid solution (concentrated hydrochloric acid, 18.5 wt% of a diluted aqueous solution, hereinafter referred to as an aqueous HCl solution) were uniformly stirred to prepare a wood adhesive 6. The wood adhesive 6 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. After mixing the two doses, the pH of the wood adhesive 6 and the pot life at 25 ° C were tested. The pH was tested on a pH meter (pH meter 6250, JENCO electronics). The viscosity change was measured by using a viscometer (DV-III, BROOK Field) with Spindle 28 at 30 rpm to measure the viscosity of the wood adhesive 6 at 30 minutes and 5 hours after mixing, and then calculating the percent change in viscosity.

[Example 7]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2, and 0.385 g of an aqueous HCl solution were uniformly stirred to prepare a wood adhesive 7. The wood adhesive 7 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 7 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer (DV-III, BROOK Field) with a Spindle 29 at 60 rpm to measure the viscosity of the wood adhesive 7 at 30 minutes and 5 hours after mixing, and then calculating the percent change in viscosity.

[Example 8]

15.0 g of an aqueous solution 1-1 and 5.0 g of an aqueous solution 2 were uniformly stirred to prepare a wood adhesive 8. The wood adhesive 8 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 8 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. Viscosity change is measured using a viscometer with Spindle 28 at 30 rpm to measure wood adhesive 8 in mixing After 30 minutes and 5 hours of viscosity, the percentage change in viscosity was calculated.

[Example 9]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2, and 0.206 g of an aqueous sodium hydroxide solution (concentrated sodium hydroxide solution, 10% by weight of a diluted aqueous solution, hereinafter referred to as an aqueous NaOH solution) were uniformly stirred to prepare a wood adhesive 9. The wood adhesive 9 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate the subsequent tensile test with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 9 was tested and the viscosity at 25 ° C was varied with time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 9 at 30 rpm and 5 hours after mixing at 30 rpm, and then calculating the percentage change in viscosity.

[Example 10]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2 and a 0.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 10. The wood adhesive 10 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. The wood chips are stacked and then pressed at 120 ° C for 20 minutes under a pressure of 200 psi to harden the wood adhesive. The joint of the wood chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 10 and the change in viscosity at 25 ° C with time were tested. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 10 at 30 minutes and 5 hours after mixing with Spindle 28 at 30 rpm, and then calculating the percent change in viscosity.

[Example 11]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2, and 0.69 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 11. The wood adhesive 11 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after the two doses were mixed, the pH of the wood adhesive 11 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 11 at 30 minutes and 5 hours after mixing with Spindle 29 at 60 rpm, and then calculating the percentage change in viscosity.

[Example 12]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2, and 1.039 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 12. The wood adhesive 12 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 12 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 12 at 30 rpm and 5 hours after mixing at 30 rpm, and then calculating the percent change in viscosity.

[Example 13]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2, and 1.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 13. The wood adhesive 13 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 13 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. Viscosity change is the use of a viscometer with a Spindle 29 at 60 rpm The viscosity of the wood adhesive 13 was measured at 30 minutes and 5 hours after mixing, and the percentage change in viscosity was calculated.

[Comparative Example 4]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2 and 2 g of an aqueous HCl solution were uniformly stirred to prepare a comparative wood adhesive. This comparison was applied to two wood chips by a wood adhesive, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the comparative wood adhesive was tested. The pH is tested on a pH meter. The viscosity change result was not tested due to phase separation.

[Comparative Example 5]

15.0 g of an aqueous solution 1-1, 5.0 g of an aqueous solution 2 and a solution of 2.54 g of NaOH were uniformly stirred to prepare a comparative wood adhesive. This comparison was applied to two wood chips by a wood adhesive, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. Test 2 is to join the wood chips first. Immersion in water at room temperature for 24 hours, direct tensile test without drying. And after mixing the two doses, the pH of the comparative wood adhesive and the change of viscosity at 25 ° C with time were tested. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the comparative wood adhesive at 30 minutes and 5 hours after mixing with Spindle 29 at 60 rpm, and then calculating the percent change in viscosity.

[Test Results]

The test results of the above examples and comparative examples are listed in Table 3. In the part of the viscosity change and the tensile test, since the results of the measurements of the plurality of samples of each of the examples and the comparative examples have deviation values, only the ranges thereof are roughly listed. Viscosity changes below 50% are excellent, more than 50% but less than 100% are also good, more than 100% are common conditions, the right choice can be used according to the needs, but more than 200% is not suitable for use. The result of the tensile test is excellent at 15 kg/cm ² or more, and less than 15 kg/cm ² and more than 8 kg/cm ² is also good, and less than or equal to 8 kg/cm ² and more than 3 kg/cm ² is an ordinary condition, and the right choice can be selected according to the demand. It is used, but it is not suitable for use below 3kg/cm ² . It can be seen that in the case of peracid or overbase, good viscosity change results and bonding effects are not obtained. In contrast, using the wood adhesive according to the example, a good viscosity change result and a bonding effect can be obtained in a wide pH range, particularly in the range of pH 2 to 12. Further, even when water immersion for 24 hours, a good bonding effect can be obtained by using the wood adhesive according to the example.

table 3

Test on the molecular weight and degree of substitution of sodium carboxymethylcellulose in aqueous solution 1 as the first agent

[Example 14]

30.0 g of an aqueous solution of 1-2, 5.0 g of an aqueous solution 2 and a 0.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 14. The wood adhesive 14 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 14 was tested and the viscosity at 25 ° C was varied with time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 14 at 30 rpm and 5 hours after mixing at Spindle 28 at 15 rpm, and then calculating the percent change in viscosity.

[Example 15]

Take 15.0 g of aqueous solution 1-1, 5.0 g of aqueous solution 2 and 0.5 g of The NaOH aqueous solution was stirred uniformly to prepare a wood adhesive 15. The wood adhesive 15 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 15 and the change in viscosity at 25 ° C with time were tested. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 15 at 30 minutes and 5 hours after mixing with Spindle 28 at 30 rpm, and then calculating the percentage change in viscosity.

[Example 16]

18.75 g of an aqueous solution 1-4, 5.0 g of an aqueous solution 2 and a 0.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 16. The wood adhesive 16 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 16 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. The viscosity change is measured by using a viscometer to measure the viscosity of the wood adhesive 16 at 30 minutes and 5 hours after mixing with Spindle 28 at 30 rpm. The percentage change in viscosity.

[Example 17]

15.0 g of an aqueous solution of 1-5, 5.0 g of an aqueous solution 2 and a 0.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 17. The wood adhesive 17 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 17 and the viscosity at 25 ° C were measured as a function of time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 17 at 30 minutes and 5 hours after mixing with Spindle 28 at 60 rpm, and then calculating the percentage change in viscosity.

[Example 18]

15.0 g of an aqueous solution of 1-6, 5.0 g of an aqueous solution 2 and a 0.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 18. The wood adhesive 18 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 is in the wood chip joint After the good, the tensile test is carried out. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH of the wood adhesive 18 and the change in viscosity at 25 ° C with time were tested. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 18 at 30 rpm and 5 hours after mixing at Spindle 29 at 100 rpm, and then calculating the percent change in viscosity.

[Example 19]

16.8 g of an aqueous solution 1-7, 5.0 g of an aqueous solution 2 and a 0.5 g of an aqueous NaOH solution were uniformly stirred to prepare a wood adhesive 19. The wood adhesive 19 was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and then wet and wet without direct drying. And after mixing the two doses, the pH of the wood adhesive 19 was tested and the viscosity at 25 ° C was varied with time. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the wood adhesive 19 at 30 minutes and 5 hours after mixing with Spindle 29 at 60 rpm, and then calculating the percent change in viscosity.

[Comparative Example 6]

Take 45.0 g of aqueous solution 1-3, 5.0 g of aqueous solution 2 and 0.5 g of The NaOH aqueous solution is stirred evenly and formulated into a comparative wood adhesive. The comparative wood adhesive was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH value of the comparative wood adhesive and the change in viscosity at 25 ° C with time were tested. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the comparative wood adhesive at 30 minutes and 5 hours after mixing with Spindle 29 at 40 rpm, and then calculating the percentage change in viscosity.

[Comparative Example 7]

Soy protein (Dupont ^® Soy polymer, LVH) formulated as a 26wt% aqueous solution, hereinafter referred to as an aqueous solution of soy protein. Take 7.5 g of soy protein aqueous solution, 5.0 g of aqueous solution 2 and 0.5 g of NaOH aqueous solution and mix well to prepare a comparative wood adhesive. The comparative wood adhesive was applied between two wood chips, wherein the wood chips were in the shape of a strip of 10 cm x 1 cm to facilitate subsequent tensile testing with a coating area of 1 square centimeter. After the chips were stacked, the wood adhesive was hardened by pressing at 120 ° C for 20 minutes under a pressure of 200 psi to complete the bonding of the chips. The bonded chips were tested for two tests. Test 1 was a tensile test after the chips were joined. In Test 2, the joined wood chips were first immersed in water at room temperature for 24 hours, and the tensile test was directly performed without drying. And after mixing the two doses, the pH value of the comparative wood adhesive and the change in viscosity at 25 ° C with time were tested. The pH is tested on a pH meter. The viscosity change was measured by using a viscometer to measure the viscosity of the comparative wood adhesive at 30 minutes and 5 hours after mixing with Spindle 29 at 40 rpm, and then calculating the percentage change in viscosity.

[Test Results]

The test results of the above examples and comparative examples are listed in Table 4. In the part of the viscosity change and the tensile test, since the results of the measurements of the plurality of samples of each of the examples and the comparative examples have deviation values, only the ranges thereof are roughly listed. Viscosity changes below 50% are excellent, more than 50% and less than 100% are also good, more than 100% for normal conditions, more than 200% are not suitable for use. The result of the tensile test is excellent at 15 kg/cm ² or more, and is less than 15 kg/cm ² and more than 8 kg/cm ² , and less than 8 kg/cm ² and more than 3 kg/cm ² is an ordinary condition, and is 3 kg/cm ² or less. It is not suitable for use. It can be seen that with the wood adhesive according to the example, a good viscosity change result and a joint effect can be obtained in a wide range of molecular weights and substitution degrees. Among them, it is more preferable that the molecular weight is about 15,000 to 250,000 and the degree of substitution is more than 0.4. Further, even when water immersion for 24 hours, a good bonding effect can be obtained by using the wood adhesive according to the example. A wood adhesive using soy protein was also listed as a comparative example (Comparative Example 7), and it can be seen that the wood adhesive according to the example is not inferior to the wood adhesive using soy protein.

In summary, since the wood adhesive according to the embodiment is used raw The material is used as the main agent, so there is no problem of formaldehyde release, and it will not be affected by the shortage of petrochemical materials. Further, since the wood adhesive according to the embodiment uses a cellulose derivative, it has an advantage in use, economical, less corrosive, and no soy smell, compared to a wood adhesive using soy protein. Further, the wood adhesive according to the embodiment can also provide a good bonding effect and a certain degree of moisture resistance.

The wood adhesion method and the wood joint structure according to the embodiment also have the above advantages due to the application of such a wood adhesive.

The present invention has been described above in terms of several embodiments and examples, which are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the claims.

Claims (14)

A wood adhesive comprising: a first agent comprising: sodium carboxymethyl cellulose, the sodium carboxymethyl cellulose having a molecular weight of 15,000 to 500,000, and the sodium carboxymethyl cellulose The degree of substitution of the salt is from 0.4 to 2.00; and a second agent comprising: a polymeric quaternary amine. The wood adhesive according to claim 1, wherein the quaternary amine salt polymer is a quaternary amine salt polymer obtained by reacting polyamidoamine with epichlorohydrin. The wood adhesive according to claim 1, wherein the first agent further comprises water, the sodium carboxymethylcellulose salt is present in the aqueous phase, and the second agent further comprises water, and the quaternary amine salt polymer is present in In the water phase. The wood adhesive of claim 1 has a pH of 2 to 12. A wood bonding method comprising: providing a first wood block and a second wood block; and joining the first wood block and the second wood block with a wood adhesive, wherein the wood adhesive comprises a first agent and a second agent comprising a sodium carboxymethyl cellulose having a molecular weight of from 15,000 to 500,000 and a degree of substitution of from 0.4 to 2.00, the first The two doses include a quaternary amine salt polymer. The wood sticking method of claim 5, wherein the step of joining the first wood block and the second wood block with the wood adhesive comprises: mixing the first agent and the second agent; covering the wood adhesive agent At least one of the first block and the second block; and hardening the wood adhesive. The wood sticking method of claim 6, wherein the mixing ratio of the first agent to the second agent is from 0.25:1 to 1:0.1. The wood adhesion method of claim 6, wherein the mixing ratio of the first agent to the second agent is from 0.7:1 to 1:0.2. The wood sticking method of claim 6, wherein the step of hardening the wood adhesive comprises pressurizing at a pressure of 10 kg/cm ² for 10 to 30 minutes at 5 ° C to 45 ° C. The wood sticking method of claim 9, wherein the step of hardening the wood adhesive further comprises pressurizing at a pressure of 10 kg/cm ² for 3 to 25 minutes at 90 ° C to 230 ° C. The wood sticking method of claim 5, further comprising pre-treating the first wooden block and the second wooden block. The wood sticking method of claim 11, wherein the step of pretreating comprises heating. A wood joint structure comprising: a first wooden block; a second wooden block; and an adhesive layer joining the first wooden block and the second wooden block, the adhesive layer being adhered by mixing a wood a first agent and a second agent of the agent and the hardening of the wood adhesive, wherein the first agent of the wood adhesive comprises carboxymethyl cellulose having a molecular weight of 15,000 to 500,000 and a degree of substitution of 0.4 to 2.00 The sodium salt, the second agent of the wood adhesive comprises a quaternary amine salt polymer. The wood joining structure of claim 13, wherein at least one of the first wooden block and the second wooden block comprises a particle board, an oriented strand board, a fiberboard, a plywood, At least one of a block board and a laminate.