阅读说明：本技术 一种提高天然植物淀粉胶黏剂粘结性能的方法 (Method for improving adhesive property of natural plant starch adhesive ) 是由 周建设 于 2019-12-04 设计创作，主要内容包括：本发明涉及新材料加工技术领域,公开了一种提高天然植物淀粉胶黏剂粘结性能的方法,通过对植物淀粉材料性能的研究,将制备得到的高效催化剂加入到淀粉原料中,添加量占淀粉原料质量分数的0.06-0.08%,以过氧化氢水溶液为氧化剂,进行催化氧化,制备天然植物淀粉胶黏剂；该介孔材料能够催化氧化进行,促进氧化剂与淀粉分子中的活性羟基发生反应,对基团进行改性,初粘力显著提高,氧化产生的羧基更容易与被粘物产生相互结合作用,提高粘结能力,增加胶黏剂的稳定性和持久性,避免了脱胶、变色等缺陷的产生,干燥速度快,耐水性好,附着力和遮盖效果好,在提高胶黏剂粘结性的同时,稳定性能也得到优化,在贮存期间稳定性能无变化。(The invention relates to the technical field of new material processing, and discloses a method for improving the bonding performance of a natural plant starch adhesive, which comprises the steps of adding a prepared high-efficiency catalyst into a starch raw material through researching the performance of a plant starch material, wherein the addition amount of the prepared high-efficiency catalyst accounts for 0.06-0.08% of the mass fraction of the starch raw material, and performing catalytic oxidation by taking a hydrogen peroxide aqueous solution as an oxidant to prepare the natural plant starch adhesive; the mesoporous material can catalyze oxidation, promote an oxidant to react with active hydroxyl in starch molecules, modify radicals, remarkably improve initial adhesion, enable carboxyl generated by oxidation to be easily combined with an adherend, improve bonding capacity, increase stability and durability of an adhesive, avoid defects such as degumming and color change, and is high in drying speed, good in water resistance, good in adhesive force and covering effect, improved in adhesive bonding performance, optimized in stability, and unchanged in stability during storage.)

1. A method for improving the adhesive property of a natural plant starch adhesive is characterized in that a prepared high-efficiency catalyst is added into a starch raw material, and a hydrogen peroxide aqueous solution is used as an oxidant for catalytic oxidation to prepare the natural plant starch adhesive;

the preparation method of the high-efficiency catalyst comprises the following steps: weighing 19-20 g of zinc carbonate, dispersing into 110-120 ml of deionized water, continuously stirring for 40-50 minutes to obtain a suspension, adding 13-15 ml of manganese nitrate solution into the suspension under stirring, continuously stirring for 20-30 minutes to obtain a uniform mixture, pouring the uniform mixture into a ball milling tank, adding 1.8-2.0 g of graphene oxide into a ball milling tank, ball milling for 50-60 minutes to obtain a ball milling mixture, filling the ball milling mixture into a ceramic boat, placing the ceramic boat in a high-temperature tube furnace, under the protection of argon, the temperature is raised to 430-440 ℃ at the speed of 2-3 ℃/min, the heat is preserved and calcined for 2.5-3.0 hours, obtaining the mesoporous material with the aperture size of 500-700 nm, centrifugally washing the mesoporous material to be neutral by using distilled water, and then soaking the catalyst in absolute ethyl alcohol for 5 to 7 hours, and carrying out suction filtration and drying to obtain the high-efficiency catalyst.

2. The method for improving the bonding performance of the natural plant starch adhesive according to claim 1, wherein the preparation method of the plant starch adhesive comprises the following steps: adding 450-480 g deionized water into 100 g of plant starch, stirring and mixing uniformly to obtain starch emulsion, heating and stirring at 35-40 ℃ for pregelatinization for 10-15 minutes, firstly adding the prepared high-efficiency catalyst into the pregelatinization solution, stirring and mixing uniformly, then adding 16-18 ml of aqueous hydrogen peroxide solution with mass concentration of 22-24% as an oxidant, and sodium hydroxide solution with the molar concentration of 4.5-5.0 mol/L is used for adjusting the pH value of the system to 9.2-9.4 for oxidation reaction for 30-35 minutes, heating to 55-60 deg.C, stirring for 20-30 min, then adding 3-5 ml of sodium sulfite solution and 8-10 ml of sodium chloride aqueous solution, stirring at the rotating speed of 200-220 rpm for 10-12 minutes to obtain the natural plant adhesive.

3. The method for improving the adhesive property of the natural plant starch adhesive according to claim 1, wherein the mass concentration of the manganese nitrate solution is 25-30%.

4. The method for improving the adhesive property of the starch adhesive made of natural plants as claimed in claim 1, wherein the flow rate of argon gas is 280-300 ml/min.

5. The method for improving the binding property of the natural plant starch adhesive according to claim 1, wherein the catalyst is added in an amount of 0.06-0.08% by mass based on the starch raw material.

6. The method for improving the adhesive property of the natural plant starch adhesive according to claim 2, wherein the mass concentration of the sodium sulfite solution is 2.8-3.0%.

7. The method for improving the adhesive property of the natural plant starch adhesive according to claim 2, wherein the mass concentration of the sodium chloride aqueous solution is 0.6-0.7%.

Technical Field

The invention belongs to the technical field of new material processing, and particularly relates to a method for improving the bonding performance of a natural plant starch adhesive.

Background

The natural plant starch is a polysaccharide natural high molecular substance which has wide sources, low price and reproducibility, is nontoxic and pollution-free, is widely used in the industries of food, medicine, textile, paper making and the like, and has the increasingly rapid development of plant starch products along with the increasingly reduced petroleum resources. Wherein the starch adhesive is prepared by starch gelatinization or starch derivatives. The starch adhesive is the adhesive with the largest consumption in the packaging industry, the paper making industry, the textile industry, the mounting industry, the clothing manufacturing industry and the daily life.

At present, natural plant starch adhesives are widely applied due to the advantages of environmental protection, low consumption, safety, low cost, no pollution and the like, however, due to the limitation of the attributes of the adhesives, the prepared starch adhesives have the problems of poor bonding performance and poor stability, and the application field of the starch adhesives is severely limited. Therefore, the performance of the natural plant starch adhesive is further improved, particularly the cohesiveness is improved, and the adhesive has important significance for improving the application of the plant starch in the field of adhesives.

Disclosure of Invention

The invention aims to provide a method for improving the bonding performance of a natural plant starch adhesive, which aims to solve the existing problems, improve the bonding capability, increase the stability and durability of the adhesive and avoid the defects of degumming, discoloration and the like.

The invention is realized by the following technical scheme:

a method for improving the adhesive property of a natural plant starch adhesive has the preferable scheme that a prepared high-efficiency catalyst is added into a starch raw material, the addition amount of the prepared high-efficiency catalyst accounts for 0.06-0.08% of the mass fraction of the starch raw material, and a hydrogen peroxide aqueous solution is used as an oxidant for catalytic oxidation to prepare the natural plant starch adhesive;

preparing a high-efficiency catalyst: weighing 19-20 g of zinc carbonate, dispersing into 120 ml of 110-minus ice, continuously stirring for 40-50 minutes to obtain a suspension, adding 13-15 ml of a manganese nitrate solution with the mass concentration of 25-30% into the suspension under stirring, continuously stirring for 20-30 minutes to obtain a uniform mixture, pouring the uniform mixture into a ball milling tank, adding 1.8-2.0 g of graphene oxide into the ball milling tank, ball milling for 50-60 minutes to obtain a ball milling mixture, putting the ball milling mixture into a ceramic boat, placing the ceramic boat in a high-temperature tube furnace, heating to 430-440 ℃ at the speed of 2-3 ℃/minute under the protection of argon, carrying out heat preservation and calcination for 2.5-3.0 hours to obtain a mesoporous material with the pore size of 500-700 nm, carrying out centrifugal washing to neutrality by using distilled water, then soaking for 5-7 hours by using anhydrous ethanol, and carrying out suction filtration and drying to obtain the high-efficiency catalyst, wherein the flow rate of the argon gas is 280-300 ml/min.

The mesoporous material can catalyze oxidation, promote the reaction of an oxidant and active hydroxyl in starch molecules, modify groups, remarkably improve the initial adhesion, enable carboxyl generated by oxidation to be easily combined with an adherend, improve the bonding capability, increase the stability and durability of an adhesive, and avoid the defects of degumming, color change and the like.

The preparation method of the plant starch adhesive comprises the following steps: adding 450-480 g deionized water into 100 g of plant starch, stirring and mixing uniformly to obtain starch emulsion, heating and stirring for pregelatinization for 10-15 minutes at 35-40 ℃, firstly adding the prepared high-efficiency catalyst into the pregelatinization solution, stirring and mixing uniformly, then adding 16-18 ml of aqueous hydrogen peroxide solution with mass concentration of 22-24% as an oxidant, adjusting the pH value of the system to be 9.2-9.4 by using sodium hydroxide solution with molar concentration of 4.5-5.0 mol/L, carrying out oxidation reaction, heating to 55-60 ℃ after reacting for 30-35 minutes, continuing stirring and gelatinizing for 20-30 minutes, then adding 3-5 ml of sodium sulfite solution with mass concentration of 2.8-3.0% and 8-10 ml of sodium chloride solution with mass concentration of 0.6-0.7%, stirring at the rotating speed of 200-220 rpm for 10-12 minutes to obtain the natural plant adhesive.

Compared with the prior art, the invention has the following advantages: in order to solve the problem of poor performance of the existing natural plant starch adhesive, the invention provides a method for improving the bonding performance of the natural plant starch adhesive, through the research on the performance of a plant starch material, a prepared high-efficiency catalyst is added into a starch raw material, the addition amount of the high-efficiency catalyst accounts for 0.06-0.08% of the mass fraction of the starch raw material, and a hydrogen peroxide aqueous solution is used as an oxidant for catalytic oxidation to prepare the natural plant starch adhesive; the mesoporous material can catalyze and oxidize, promote the reaction of an oxidant and active hydroxyl in starch molecules, modify radicals, remarkably improve the initial adhesion, enable carboxyl generated by oxidation to be more easily combined with an adherend, improve the bonding capability, increase the stability and durability of an adhesive, avoid the defects of degumming, color change and the like, and has the advantages of high drying speed, good water resistance, good adhesive force and covering effect, improved adhesive bonding property, optimized stability and unchanged stability during storage; the invention can obviously improve the adhesiveness of the natural plant starch adhesive, solves the problems of easy molecular chain increase and enhanced hydrophilicity of the existing catalyst, and can improve the water resistance and stability of the adhesive on the premise of ensuring the adhesive bonding degree. The natural plant adhesive has the characteristics of high bonding strength, light weight, no pollution, excellent fluidity and water resistance, and good quick-drying effect, is beneficial to the development of the natural plant adhesive to multiple fields and high performance, can realize the practical significance of promoting the industrial development of the natural plant adhesive and improving the market competitiveness, has higher value for the performance research and application of the natural plant environment-friendly adhesive, obviously promotes the rapid development and the sustainable development of resources in the field of the research of the environment-friendly adhesive, and is a technical scheme which is extremely worthy of popularization and application.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 shows the comparative effect of the method of the present invention on improving the bonding performance of the natural plant starch adhesive and the control group (the solid line in fig. 1 represents the result of improving the bonding performance of the natural plant starch adhesive, and the dotted line represents the result of preparing the bonding performance of the natural plant starch adhesive from the control group, both of which use corn starch as the raw material).

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.