阅读说明：本技术 一种绿色非甲醛木材胶粘剂及其制备方法 (Green non-formaldehyde wood adhesive and preparation method thereof ) 是由 许月婷 赵莉莉 何志松 于 2020-08-17 设计创作，主要内容包括：本发明涉及胶黏剂制备领域,具体关于一种绿色非甲醛木材胶粘剂及其制备方法；本发明的一种绿色非甲醛木材胶粘剂及其制备方法,本发明制备的一种绿色非甲醛木材胶粘剂具有以下特点：本发明的非甲醛胶黏剂完全不会有甲醛或其他有害物质挥发,是一种真正绿色健康的木材胶黏剂；本发明的胶黏剂的主要原材料是来自于天然植物的淀粉和木质素,具有材料来源广泛和廉价易得的优点；本发明的胶黏剂的制备方法简单可靠,稳定型高,重复性好,具备实际工业化价值；本发明的胶黏剂具有较好的粘结强度,具有较好的耐湿性,在潮湿环境下也具有较高的粘结性,性能优异,适合应用于家装等各个领域。(The invention relates to the field of adhesive preparation, in particular to a green non-formaldehyde wood adhesive and a preparation method thereof; the invention relates to a green non-formaldehyde wood adhesive and a preparation method thereof, and the green non-formaldehyde wood adhesive prepared by the invention has the following characteristics: the non-formaldehyde adhesive disclosed by the invention is completely free from formaldehyde or other harmful substances, and is a real green and healthy wood adhesive; the main raw materials of the adhesive are starch and lignin from natural plants, and the adhesive has the advantages of wide material source, low price and easy obtainment; the preparation method of the adhesive is simple and reliable, has high stability and good repeatability, and has actual industrial value; the adhesive disclosed by the invention has the advantages of good bonding strength, good moisture resistance, high bonding property in a humid environment, excellent performance and suitability for various fields such as home decoration.)

1. A green non-formaldehyde wood adhesive and a preparation method thereof are disclosed, the method comprises the following operations:

adding 3-8 parts by weight of N, N-dimethyl bisacrylamide, 10-18 parts by weight of acrylamide, 60-80 parts by weight of starch, 40-53 parts by weight of modified lignin and 580 parts by weight of water into a reaction kettle, stirring and mixing uniformly, controlling the temperature to be 70-95 ℃, reacting for 1-5h, slowly adding 30-50 parts by weight of initiator aqueous solution dissolved with 3-8 parts by weight into the reaction kettle within 180min of 120-5 h, keeping the temperature for 3-6h after the reaction is finished, adjusting the pH to be 7.6-9.2 by using 5-15% by weight of ammonia aqueous solution, controlling the temperature to be 75-95 ℃ by weight of hydrogen peroxide solution with 20-30 parts by weight, stirring and reacting for 45-90min, and performing ball milling for 30-60min to obtain the green non-formaldehyde wood adhesive.

2. The green non-formaldehyde wood adhesive and the preparation method thereof according to claim 1, characterized in that: the preparation method of the modified lignin comprises the following steps:

adding 40-58 parts of lignin, 20-30 parts of 3- (trimethylsilyl) -4-pentenoic acid, 0.5-2.5 parts of sodium hydrogen phosphate and 480 parts of water in parts by mass into the solution, uniformly mixing, controlling the temperature to be 60-80 ℃, stirring for reaction for 100-200min, adding 0.5-0.9 part of diallyldimethylammonium chloride and 0.05-0.1 part of vinyl ferrocene, slowly adding 30-50 parts of initiator aqueous solution dissolved with 3-8 parts of initiator into a reaction kettle within 180min of 120-0, controlling the temperature to be 60-80 ℃, stirring for mixing for 45-90min, and evaporating to remove water to obtain the modified lignin.

3. The green non-formaldehyde wood adhesive and the preparation method thereof according to claim 1, characterized in that: the mass concentration of the hydrogen peroxide is 25-30%.

4. The green non-formaldehyde wood adhesive and the preparation method thereof according to claim 1, characterized in that: the initiator is ammonium hydrogen perphosphate or potassium sodium perphosphate or benzoyl peroxide.

5. The green non-formaldehyde wood adhesive and the preparation method thereof according to claim 1, characterized in that: the starch is potato starch or sweet potato starch.

Technical Field

The invention relates to the field of adhesive preparation, in particular to a green non-formaldehyde wood adhesive and a preparation method thereof.

Background

After the wood adhesive industry is subjected to short rapid development, a huge crisis is met, and the traditional wood adhesive represented by phenolic resin and urea-formaldehyde resin has the problem of volatilization of toxic substances, particularly formaldehyde, as a class 1 carcinogenic substance by the world health organization as early as 2006. Wood adhesive technology has been the focus of people.

CN107641479A relates to a preparation method of an aldehyde-free wood adhesive, belonging to the technical field of material processing. The method comprises the steps of taking tryptone, yeast extract and sodium chloride solution, and adjusting the pH value to obtain a culture medium; washing Bulbus Lilii with distilled water, soaking in ethanol solution, and washing with sterile water; slicing with a sterile knife, placing the slices on the surface of a culture medium, adjusting the temperature, culturing, selecting bacterial colonies, mixing the bacterial colonies with deionized water, and filtering to obtain a strain suspension; boiling glutinous rice flour and deionized water in an electric cooker, and continuously decocting, wherein the glutinous rice flour and the deionized water are stirred once every half an hour to prepare glutinous rice paste; adding the strain suspension into the glutinous rice pulp, placing the glutinous rice pulp in a constant-temperature shaking table, and shaking to obtain modified glutinous rice pulp; dissolving dopamine in a Tris-HCl buffer solution to prepare a dopamine hydrochloride solution; placing the modified glutinous rice pulp, the dopamine hydrochloride solution, the coupling agent and the preservative into a reaction kettle, and stirring to obtain the aldehyde-free wood adhesive.

CN106928888A relates to a preparation method of an environment-friendly wood preservative adhesive, which comprises the following steps: (1) preparing a main agent: taking phenolic resin adhesive as a base material, adjusting the pH value to be neutral, heating to 50-60 ℃, adding a proper amount of epoxy resin, maintaining the constant temperature for reaction for 5-15min, and then cooling to the normal temperature; (2) preparing a functional agent: mixing appropriate amount of propolis powder and organic bentonite, heating to 60-70 deg.C to form stable molten viscous fluid, and filtering to remove particulate impurities; (3) preparing an adhesive finished product: uniformly mixing the main agent, the functional agent and the solvent according to a proper proportion, and standing for 8-12 h; (4) and (4) removing the solvent from the material obtained in the step (3) in vacuum, and drying and crushing the material to obtain the finished product of the environment-friendly wood preservative adhesive. The raw materials of the adhesive are reasonably selected and properly matched, and compared with the existing adhesive, the prepared adhesive has excellent water resistance and bonding performance, and is good in uniformity and smoothness in the drying process.

CN106433557A relates to a preparation method of a composite wood adhesive, and belongs to the technical field of adhesive preparation. According to the invention, firstly, isolated soy protein is modified by urea and then reacts with mussel mucin under an alkaline condition to obtain modified isolated soy protein, then enzymolysis is carried out on the isolated soy protein from a parthenocissus tricuspidata sucker to obtain viscous polysaccharide, and finally the viscous polysaccharide is mixed to obtain the adhesive.

The adhesive raw materials currently used in the wood industry mainly come from petroleum resources, the non-regenerability of the petroleum resources, the increasing attention of people to environmental problems and toxic volatile substances in the adhesive, and people are forced to find a renewable substitute capable of preparing a non-formaldehyde wood adhesive.

Disclosure of Invention

In order to solve the problems, the invention provides a green non-formaldehyde wood adhesive and a preparation method thereof.

A green non-formaldehyde wood adhesive and a preparation method thereof are disclosed, the method comprises the following operations:

adding 3-8 parts by weight of N, N-dimethyl bisacrylamide, 10-18 parts by weight of acrylamide, 60-80 parts by weight of starch, 40-53 parts by weight of modified lignin and 580 parts by weight of water into a reaction kettle, stirring and mixing uniformly, controlling the temperature to be 70-95 ℃, reacting for 1-5h, slowly adding 30-50 parts by weight of initiator aqueous solution dissolved with 3-8 parts by weight into the reaction kettle within 180min of 120-5 h, keeping the temperature for 3-6h after the reaction is finished, adjusting the pH to be 7.6-9.2 by using 5-15% by weight of ammonia aqueous solution, controlling the temperature to be 75-95 ℃ by weight of hydrogen peroxide solution with 20-30 parts by weight, stirring and reacting for 45-90min, and performing ball milling for 30-60min to obtain the green non-formaldehyde wood adhesive.

The preparation method of the modified lignin comprises the following steps:

adding 40-58 parts of lignin, 20-30 parts of 3- (trimethylsilyl) -4-pentenoic acid, 0.5-2.5 parts of sodium hydrogen phosphate and 480 parts of water in parts by mass into the solution, uniformly mixing, controlling the temperature to be 60-80 ℃, stirring for reaction for 100-200min, adding 0.5-0.9 part of diallyldimethylammonium chloride and 0.05-0.1 part of vinyl ferrocene, slowly adding 30-50 parts of initiator aqueous solution dissolved with 3-8 parts of initiator into a reaction kettle within 180min of 120-0, controlling the temperature to be 60-80 ℃, stirring for mixing for 45-90min, and evaporating to remove water to obtain the modified lignin.

The mass concentration of the hydrogen peroxide is 25-30%.

The initiator is ammonium hydrogen perphosphate or potassium sodium perphosphate or benzoyl peroxide.

The starch is potato starch or sweet potato starch.

The invention relates to a green non-formaldehyde wood adhesive and a preparation method thereof, and the green non-formaldehyde wood adhesive prepared by the invention has the following characteristics: the non-formaldehyde adhesive disclosed by the invention is completely free from formaldehyde or other harmful substances, and is a real green and healthy wood adhesive; the main raw materials of the adhesive are starch and lignin from natural plants, and the adhesive has the advantages of wide material source, low price and easy obtainment; the preparation method of the adhesive is simple and reliable, has high stability and good repeatability, and has actual industrial value; the adhesive disclosed by the invention has the advantages of good bonding strength, good moisture resistance, high bonding property in a humid environment, excellent performance and suitability for various fields such as home decoration.

Drawings

FIG. 1 is a Fourier infrared spectrum of a green non-formaldehyde wood adhesive prepared in example 2:

at 2944cm^-1The expansion and contraction absorption peak of the hydrocarbon exists nearby and is 1067cm^-1An antisymmetric stretching absorption peak of an ether bond existing in the vicinity of the absorption peak at 3341/1372cm^-1The expansion/in-plane bending absorption peak of hydroxyl exists nearby, which indicates that the starch participates in the reaction; at 1610/1498/1460cm^-1The expansion and contraction absorption peak of benzene ring exists nearby, and is 1250cm^-1An absorption peak of ether bond of the phenylate exists nearby, which shows that the modified lignin glue participates in the reaction; at 1724cm^-1An absorption peak of ester carbonyl exists nearby, so that the acrylate participates in the reaction; at 1296cm^-1An absorption peak of a carbon-nitrogen single bond exists nearby, and the reaction is shown to be participated by acrylamide and N, N-dimethyl bisacrylamide.

Detailed Description

The invention is further illustrated by the following specific examples: