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CN-122012019-A - Preparation method of defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler

CN122012019ACN 122012019 ACN122012019 ACN 122012019ACN-122012019-A

Abstract

A preparation method of a defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler relates to the field of wooden furniture production and processing. The preparation method comprises the steps of taking defatted soybean flour as a main raw material, dispersing the defatted soybean flour in deionized water, adding monosaccharide, stirring and mixing uniformly, adding premixed inorganic filler and silane coupling agent, and carrying out ultrahigh pressure treatment after vacuum sealing to obtain the adhesive. The organic-inorganic hybrid system is constructed by destroying the soybean protein space structure by ultrahigh pressure, consuming hydrophilic groups by monosaccharide crosslinking and inorganic filler, multiple synergistic modification is realized, the problems of low solid content, poor water resistance and insufficient bonding strength of the traditional soybean adhesive are effectively solved, and the prepared adhesive has the advantages of high solid content, good fluidity, no formaldehyde, environmental protection, low cost and suitability for industrial production, and is suitable for processing wood products such as plywood, flakeboard and the like.

Inventors

  • WU XUEE
  • ZHANG CHI

Assignees

  • 厦门大学

Dates

Publication Date
20260512
Application Date
20260312

Claims (10)

  1. 1. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler is characterized by comprising the following steps of: 1) 1-30 parts of defatted soybean flour is taken according to parts by weight, added into 10-100 parts of deionized water, and stirred in a constant-temperature water bath until the defatted soybean flour is uniformly dispersed, so as to obtain a defatted soybean flour solution; 2) Adding 1-10 parts of monosaccharide into the defatted soybean flour solution, and continuously stirring under constant-temperature water bath to obtain a monosaccharide-defatted soybean flour mixture; 3) Uniformly mixing 1-20 parts of inorganic filler and 1-10 parts of silane coupling agent, adding the mixture into the monosaccharide-defatted soybean flour mixture, and continuously stirring the mixture in a constant-temperature water bath to obtain a defatted soybean flour mixture; 4) Filling the defatted soybean flour mixture into a sealing bag, and performing vacuum sealing; 5) And (3) placing the defatted soybean powder mixture subjected to vacuum sealing in ultrahigh pressure equipment for ultrahigh pressure treatment to obtain the defatted soybean powder adhesive.
  2. 2. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler, which is disclosed in claim 1, is characterized in that in the step 1), defatted soybean flour with the commercial protein content of 50% -60% is adopted, the stirring temperature is 25-60 ℃, and the stirring time is 1-3 hours.
  3. 3. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler according to claim 1, wherein in the step 2), the monosaccharide adopts at least one of glucose, fructose and xylose, the stirring temperature is 25-60 ℃, and the stirring time is 1-3h.
  4. 4. The method for preparing the ultra-high pressure, monosaccharide and inorganic filler multi-modified defatted soybean flour adhesive according to claim 3, wherein the monosaccharide adopts fructose.
  5. 5. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler according to claim 1, wherein in the step 3), montmorillonite with purity more than or equal to 90% is adopted as the inorganic filler, KH550 is adopted as a silane coupling agent, the stirring temperature is 25-60 ℃, and the stirring time is 1-3 hours.
  6. 6. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler, which is disclosed in claim 1, is characterized in that in the step 4), the parameters of vacuum sealing are that the vacuumizing time is 20-60 s, the heat sealing time is 1-5 s, and the heat sealing temperature is 80-120 ℃.
  7. 7. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler, which is disclosed in claim 1, is characterized in that in step 5), the ultrahigh pressure treatment is carried out under the conditions that water is used as a pressure conduction medium, the pressure is 100-600 MPa, the temperature is 20-30 ℃, and the treatment time is 3-60 min.
  8. 8. The preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler is characterized in that the ultrahigh pressure treatment condition is that the ultrahigh pressure treatment is carried out for 15-25 min under the conditions of 550MPa and 25 ℃.
  9. 9. A defatted soy flour adhesive, characterized by being prepared by the preparation method according to any one of claims 1 to 8.
  10. 10. The defatted soy flour adhesive of claim 9, wherein the defatted soy flour adhesive has a solids content of greater than or equal to 25%, an initial viscosity of less than or equal to 500 Pa-s, a dry shear strength of greater than or equal to 2.0MPa, and a wet shear strength of greater than or equal to 1.2MPa.

Description

Preparation method of defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler Technical Field The invention relates to the field of wooden furniture production and processing, in particular to a preparation method of a defatted soybean flour adhesive with higher solid content and water resistance based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler. Background Traditional wood adhesive raw materials mainly comprise urea-formaldehyde resin, phenolic resin and melamine resin, formaldehyde can be released in the using process, physical health is endangered, and environmental pollution can be caused. The soybean has the advantages of rich yield, environmental protection, reproducibility and the like, and has great potential in the field of raw materials of wood adhesives. Common soybean byproducts include Soy Protein Isolate (SPI), soy Protein Concentrate (SPC) and Defatted Soy Flour (DSF), wherein defatted soy flour (containing 50-60% soy protein) is low in cost and more beneficial to practical production and application. The molecular chain of soybean protein contains various hydrophilic groups such as hydroxyl, carboxyl, amino and the like, and the interaction inside the adhesive is easily destroyed in a humid environment. And soy proteins tend to entrap hydrophobic nonpolar groups in the center during folding and crimping of the peptide chain due to the hydrophobic effect of the protein, leaving hydrophilic polar groups exposed on the surface. This results in the soybean adhesive generally having problems of low adhesive strength, poor water resistance, etc., which limits its practical production applications. In addition, the solids content also affects the application of defatted soy flour adhesives. When the solid content of the adhesive is too low, on one hand, the surface of the coated substrate is easy to be in a glue shortage condition, so that the adhesive has poor adhesive effect and low strength, and on the other hand, the relative water content of the soybean adhesive is too high, so that the soybean adhesive is not beneficial to storage, and the energy consumption generated in the hot press molding process of plywood or a shaving board is higher. Common methods for increasing the solid content of the soybean adhesive comprise increasing the quality of soybean powder, filling organic resin and the like, but the methods not only can cause higher cost, but also can cause higher viscosity, are unfavorable for the sizing process, influence the uniformity of coating the adhesive on the surface of a substrate, and further influence the adhesive property of the adhesive. The inorganic filler has wide sources and low cost, and is a feasible method for improving the solid content of the defatted soybean flour adhesive and reducing the viscosity. Disclosure of Invention The invention aims to overcome the defects of low solid content, poor moisture resistance, insufficient bonding strength and the like of the existing soybean adhesive, and provides a preparation method of the ultra-high pressure, monosaccharide and inorganic filler multi-modified defatted soybean flour adhesive, which realizes synchronous promotion of high solid content, high water resistance and high bonding strength of the adhesive, and has the advantages of controllable cost and environmental protection and no aldehyde. In order to achieve the above object, the present invention provides the following technical solutions: the preparation method of the defatted soybean flour adhesive based on multiple modification of ultrahigh pressure, monosaccharide and inorganic filler comprises the following steps: 1) 1-30 parts of defatted soybean flour is taken according to parts by weight, added into 10-100 parts of deionized water, stirred in a constant-temperature water bath until the defatted soybean flour is uniformly dispersed, and a defatted soybean flour solution is obtained; 2) Adding 1-10 parts of monosaccharide into the defatted soybean flour solution, and continuously stirring in a constant-temperature water bath to obtain a monosaccharide-defatted soybean flour mixture; 3) Mixing 1-20 parts of inorganic filler and 1-10 parts of silane coupling agent, adding the mixture into the monosaccharide-defatted soybean flour mixture, and continuously stirring the mixture in a constant-temperature water bath to obtain a defatted soybean flour mixture; 4) Filling the defatted soybean flour mixture into a sealing bag, and vacuum sealing; 5) And carrying out ultrahigh pressure treatment on the defatted soybean powder mixture subjected to vacuum sealing in ultrahigh pressure equipment to obtain the defatted soybean powder adhesive. In the step 1), defatted soybean flour with the commercial protein content of 50% -60% can be adopted, the stirring temperature can be 25-60 ℃, and the stirring time can be 1-3 h. In the step 2), the monosaccharide can be