阅读说明：本技术 一种高性能葡萄糖基环保胶粘剂及其制备方法 (High-performance glucose-based environment-friendly adhesive and preparation method thereof ) 是由 席雪冬 雷洪 宋佳璇 杜官本 曹龙 于 2021-08-30 设计创作，主要内容包括：本发明属于木材胶粘剂制备技术领域,具体涉及一种高性能葡萄糖基环保胶粘剂及其制备方法,由如下重量份原料制成：葡萄糖30-50份、氧化剂3-10份、溶剂30-50份、多元胺10-30份,所述胶粘剂在室温条件下通过简单搅拌反应即可制备得到高性能葡萄糖基胶粘剂,具有绿色环保、健康无害、粘接强度高、耐水性优的特点。(The invention belongs to the technical field of wood adhesive preparation, and particularly relates to a high-performance glucose-based environment-friendly adhesive and a preparation method thereof, wherein the high-performance glucose-based environment-friendly adhesive is prepared from the following raw materials in parts by weight: 30-50 parts of glucose, 3-10 parts of an oxidant, 30-50 parts of a solvent and 10-30 parts of polyamine, wherein the adhesive can be prepared into the high-performance glucose-based adhesive by simple stirring reaction at room temperature, and has the characteristics of environmental friendliness, health, harmlessness, high bonding strength and excellent water resistance.)

1. The high-performance glucose-based environment-friendly adhesive is characterized by being prepared from the following raw materials in parts by weight: 30-50 parts of glucose, 3-10 parts of an oxidant, 30-50 parts of a solvent and 10-30 parts of polyamine.

2. The high-performance glucose-based environment-friendly adhesive as claimed in claim 1, wherein the oxidant is any one or more of potassium permanganate, sodium periodate, hydrogen peroxide and sodium nitrate.

3. The high-performance glucose-based environment-friendly adhesive according to claim 1, wherein the polyamine is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine and triethylenetetramine.

4. The high-performance glucose-based environment-friendly adhesive as claimed in claim 1, wherein the solvent is one or more of distilled water, ultrapure water and deionized water.

5. The preparation method of the high-performance glucose-based environment-friendly adhesive according to any one of claims 1 to 4, wherein the preparation method comprises the following steps: adding glucose into a solvent to be fully dissolved at room temperature, adding an oxidant under the stirring condition, continuously stirring for 15-30min, then adding polyamine, and continuously stirring for 15-30min to obtain the adhesive.

6. The method for preparing high-performance glucose-based environment-friendly adhesive according to claim 5, wherein the room temperature is 5-35 ℃.

7. The high-performance glucose-based environment-friendly adhesive as claimed in any one of claims 1 to 4, which is used for bonding wood powder, grass powder, plant biomass powder, plates, paper, wood chips and fibers.

8. The high-performance glucose-based environment-friendly adhesive according to claim 7 is used for preparing artificial board adhesive.

9. The use of claim 8, wherein the artificial board is any one of plywood, fiberboard and particle board.

Technical Field

The invention belongs to the technical field of wood adhesive preparation, and particularly relates to a high-performance glucose-based environment-friendly adhesive and a preparation method thereof.

Background

Glucose is the most widely distributed and important monosaccharide in the nature, is widely distributed in animal and plant tissues and cells, and can be obtained industrially by hydrolyzing starch or cellulose, so that the glucose is a plentiful biomass resource. Glucose contains five hydroxyl groups, one aldehyde group, and has the properties of a polyol and an aldehyde. Under certain conditions, aldehyde groups on glucose can undergo oxidation reactions and reduction reactions. In addition, the molecule of the compound has a plurality of hydroxyl groups, so that not only can oxidation reaction be carried out, but also esterification reaction can be carried out with carboxylic acid. Glucose is not widely applied in the field of adhesives in the wood industry, and currently, many groups reported are based on aldehyde groups in the structure of glucose, so that the glucose can be used for partially or completely replacing formaldehyde, and further can react with urea, melamine, phenol, hydroquinone and the like to synthesize adhesives similar to urea-formaldehyde resin adhesives, melamine resin adhesives or phenolic resin adhesives. However, the aldehyde group activity of glucose is obviously lower than that of formaldehyde, so that the performance of the resin prepared by replacing formaldehyde with the glucose is not ideal.

In addition, glucose can also generate 5-hydroxymethyl-2-furfural (HMF) active monomer through a series of complex chemical changes under the action of hot acid, and the adhesive similar to furan resin is generated through polycondensation under the action of a catalyst, heat and pressure. Research reports that phosphoric acid, ammonium dihydrogen phosphate, citric acid and the like are mixed with glucose for heat treatment and then used for preparing plywood, and a good gluing effect is achieved. However, like furan resin, the glucose-based furan-based resin has high requirement on the acidity of curing, needs to be cured under a strong acidic condition, releases a large amount of heat during the curing reaction, is violent in reaction, releases more water, is easy to form bubbles, and causes the impermeability and brittleness of the cured product to be poor. In addition, the prepared furan-based resin has short working life and inconvenient operation, and the strong acid curing system causes damage to a wood joint interface, thereby reducing the gluing effect, so the application of the furan-based resin in the wood product and artificial board industry is greatly limited. In addition, in the process of catalyzing and converting gluconic acid into HMF, firstly, the gluconic acid is isomerized into fructose, and then the fructose is further dehydrated under the acid catalysis condition to generate the HMF. The reaction of the process of isomerizing the glucose into the fructose is limited by thermodynamic equilibrium, so that the conversion yield of the HMF is limited, and the defects of high production cost, low reaction efficiency and the like exist.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a high-performance glucose-based environment-friendly adhesive and a preparation method thereof.

The method is realized by the following technical scheme:

a first object of the present invention is to provide: a high-performance glucose-based environment-friendly adhesive is prepared from the following raw materials in parts by weight: 30-50 parts of glucose, 3-10 parts of an oxidant, 30-50 parts of a solvent and 10-30 parts of polyamine.

The oxidant is any one or more of potassium permanganate, sodium periodate, hydrogen peroxide and sodium nitrate.

The polyamine is one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine and triethylenetetramine.

The solvent has the function of dissolving glucose, and is preferably any one or more of distilled water, ultrapure water and deionized water.

A second object of the present invention is to provide: the preparation method of the high-performance glucose-based environment-friendly adhesive comprises the following steps: adding glucose into a solvent to be fully dissolved at room temperature, adding an oxidant under the stirring condition, continuously stirring for 15-30min, then adding polyamine, and continuously stirring for 15-30min to obtain the adhesive.

The room temperature is 5-35 ℃; preferably 15-25 deg.c.

A third object of the present invention is to provide: the high-performance glucose-based environment-friendly adhesive is used for bonding wood powder, grass powder, plant biomass powder, plates, wood chips and fibers.

Further, the high-performance glucose-based environment-friendly adhesive is used for preparing artificial board adhesive.

The artificial board is any one of plywood, fiberboard and flakeboard.

The gluing method of the plywood comprises the following steps: the glue coating amount is 260g/m of double-sided glue application²The hot pressing time is 160 ℃, the pressure is 1.0MPa, and the hot pressing time is 6 minutes.

The dry shear strength of the plywood is more than 1.1MPa, the wet strength after 24-hour cold water soaking is more than 1.0MPa, the wet strength after 63 +/-3 ℃ water soaking for 3 hours is more than or equal to 0.8MPa, the wet strength after 3-hour boiling water boiling is more than or equal to 0.75MPa, the dry shear strength is more than or equal to the standard requirement of the glue for the II-type plywood with the bonding strength of more than or equal to 0.70MPa in the national standard GB/T9846-.

The gluing method of the shaving board comprises the following steps: under the condition of room temperature, completely mixing oven-dried wood shavings and a prepared glucose-based adhesive, wherein the glue application amount is 10% of the mass of the wood shavings, putting the mixed wood shavings into a mould, prepressing for 10min at normal temperature, demoulding, and putting into a hot press for hot pressing, wherein the process comprises the following steps: the hot pressing temperature is 160 ℃, the pressure is 1.5MPa, and the hot pressing time is 8 min. The obtained shaving board has a thickness of 10mm and a density of 0.66-0.71g/cm³And the internal bonding strength is more than 0.75 +/-0.07 MPa.

The technical principle is as follows:

according to the invention, glucose reacts with an oxidant at room temperature, the glucose is oxidized into aldehyde substances, and then the aldehyde and amino groups in polyamine undergo Schiff base reaction to form a branched chain polymer with a certain molecular weight, and the polymer is further subjected to polycondensation in the hot pressing process of the artificial board to form a macromolecular branched chain net structure, so that the good gluing performance of the adhesive is ensured. The oxidation reaction and the Schiff base reaction can be carried out at a lower temperature (such as room temperature), so that the glucose-based environment-friendly adhesive prepared by the method can be synthesized only at room temperature.

Has the advantages that:

1. the adhesive prepared by the invention is environment-friendly, healthy and harmless, has high bonding strength and excellent water resistance, the performance index is far higher than the adhesive requirement for the II-type plywood specified in the national standard GB/T9846, and the dry shear strength of the prepared plywood is more than 1.1MPa, the wet strength after 24-hour cold water soaking is more than 1.0MPa, and the wet strength after 63 +/-3 ℃ water soaking for 3 hours is more than or equal to 0.8MPa according to the testing method of the national standard GB/T17657-plus 2013 plywood. 2. Because the wood-plastic composite board does not contain harmful components such as formaldehyde, the wood-plastic composite board can be widely applied to the fields closely related to human life such as home decoration, artificial boards and the like. 3. The preparation method disclosed by the invention is simple to operate, realizes room-temperature preparation, has few environmental control factors, and reduces energy consumption caused by heating in production. 4. The adhesive has the advantages of simple formula, wide raw material source and low cost.

Detailed Description

The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.

Example 1

A preparation method of a high-performance glucose-based environment-friendly adhesive comprises the following steps:

1) preparing materials: 30.0g of glucose, 3.0g of sodium periodate, 30.0g of distilled water and 10.0g of hexamethylene diamine are weighed for standby;

2) adding glucose into distilled water at room temperature (5 ℃) to fully dissolve, firstly adding sodium periodate under the stirring condition, continuously stirring for 15min, then adding hexamethylene diamine, and continuously stirring for 15min to glue.

Example 2

A preparation method of a high-performance glucose-based environment-friendly adhesive comprises the following steps:

1) preparing materials: weighing 50.0g of glucose, 10.0g of potassium permanganate, 50.0g of distilled water and 30.0g of ethylenediamine for later use;

2) adding glucose into distilled water at room temperature (35 ℃) to fully dissolve, adding potassium permanganate under the stirring condition, continuing to stir for 30min, then adding ethylenediamine, continuing to stir for 30min, and then sizing.

Example 3

A preparation method of a high-performance glucose-based environment-friendly adhesive comprises the following steps:

1) preparing materials: weighing 40.0g of glucose, 8.0g of hydrogen peroxide, 40.0g of distilled water and 20.0g of diethylenetriamine for later use;

2) under the condition of room temperature (20 ℃), adding glucose into distilled water for full dissolution, adding hydrogen peroxide under the condition of stirring, continuously stirring for 20min, then adding diethylenetriamine, and continuously stirring for 25min to obtain the adhesive.

Example 4

A preparation method of a high-performance glucose-based environment-friendly adhesive comprises the following steps:

1) preparing materials: weighing 35.6g of glucose, 6.5g of sodium nitrate, 42.5g of distilled water and 15.0g of triethylenetetramine for later use;

2) adding glucose into distilled water at room temperature (15 ℃) to fully dissolve, adding sodium nitrate under the stirring condition, continuously stirring for 25min, then adding triethylenetetramine, and continuously stirring for 25min to glue.

Example 5

A preparation method of a high-performance glucose-based environment-friendly adhesive comprises the following steps:

1) preparing materials: preparing and weighing 32.8g of glucose, 7.3g of potassium permanganate, 35.0g of distilled water and 26.2g of diethylenetriamine for later use;

2) under the condition of room temperature (25 ℃), adding glucose into distilled water for full dissolution, firstly adding potassium permanganate under the condition of stirring, continuously stirring for 20min, then adding diethylenetriamine, and continuously stirring for 15min, thus sizing.

Example 6

A method for using high-performance glucose-based environment-friendly adhesive to manufacture plywood comprises the following steps: the glue coating amount is 260g/m of double-sided glue application²The hot pressing time is 160 ℃, the pressure is 1.0MPa, and the hot pressing time is 6 minutes.

The dry shear strength of the plywood is more than 1.1MPa, the wet strength after 24-hour cold water soaking is more than 1.0MPa, the wet strength after 3-hour water soaking at 63 +/-3 ℃ is more than or equal to 0.8MPa, the wet strength after 3-hour boiling water boiling is more than or equal to 0.75MPa, the dry shear strength is more than or equal to the standard requirement of the glue for the II-type plywood with the bonding strength of more than or equal to 0.70MPa in the national standard GB/T9846-;

preparing an adhesive according to the proportion shown in the table 1 by the method of the embodiment 5, then preparing a plywood according to the conditions of the embodiment 6, and finally detecting the bonding performance of the adhesive by referring to the national standard GB/T17657-2013; the experimental group proportion is as follows:

TABLE 1 Experimental group formulation

Table 2 adhesive bond performance test results for different formulations

Example 7

A method for manufacturing a shaving board by using a high-performance glucose-based environment-friendly adhesive comprises the following steps: under the condition of room temperature, completely mixing oven-dried wood shavings and a prepared glucose-based adhesive, wherein the glue application amount is 10% of the mass of the wood shavings, putting the mixed wood shavings into a mould, prepressing for 10min at normal temperature, demoulding, and putting into a hot press for hot pressing, wherein the process comprises the following steps: the hot pressing temperature is 160 ℃, the pressure is 1.5MPa, and the hot pressing time is 8 min. The obtained shaving board has a thickness of 10mm and a density of 0.66-0.71g/cm³And the internal bonding strength is more than 0.75 +/-0.07 MPa.