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CN-121974573-A - Preparation method of konjak glucomannan modified pea starch glass fiber impregnating compound

CN121974573ACN 121974573 ACN121974573 ACN 121974573ACN-121974573-A

Abstract

The invention belongs to the technical field of glass fiber surface treatment agents, and discloses a preparation method of a konjak glucomannan modified pea starch glass fiber impregnating compound, which comprises the steps of gelatinizing pea starch in water for 30 minutes at 85 ℃ to prepare a pea starch solution; dissolving konjak glucomannan in water under stirring at 60 ℃ to obtain konjak glucomannan solution, mixing pea starch solution and konjak glucomannan solution according to a mass ratio of 4:1, adding a silane coupling agent, performing esterification grafting reaction at 75 ℃ for 1 hour to obtain a mixed solution, adding a plasticizer, a lubricant and an antistatic agent into the mixed solution, and homogenizing at high speed to obtain the impregnating compound. The invention adopts a pea starch and konjak glucomannan full biological base system, prepares the impregnating compound through the aqueous phase esterification reaction, has simple process and mild reaction condition, forms a three-dimensional network through esterification and cross-linking of konjak glucomannan linear molecules and pea starch branched chains, and improves the compactness of the film layer.

Inventors

  • LI JIANFENG
  • HE JUNHUI
  • Xie shucheng

Assignees

  • 四川建筑职业技术学院

Dates

Publication Date
20260505
Application Date
20260206

Claims (10)

  1. 1. The preparation method of the konjac glucomannan modified pea starch glass fiber sizing agent is characterized by comprising the following steps of: s100, adding water into pea starch, and gelatinizing for 30 minutes at 85 ℃ to prepare pea starch solution; S200, adding water into konjak glucomannan, stirring and dissolving at 60 ℃ to prepare konjak glucomannan solution; S300, mixing pea starch solution and konjak glucomannan solution according to a mass ratio of 4:1, adding a silane coupling agent, and carrying out esterification grafting reaction for 1 hour at 75 ℃ to obtain a mixed solution; S400, adding a plasticizer, a lubricant and an antistatic agent into the mixed solution, and homogenizing at a high speed to obtain the sizing agent.
  2. 2. The method for preparing the konjac glucomannan modified pea starch glass fiber sizing agent according to claim 1, wherein the concentration of the pea starch solution in percentage by mass of S100 is 8-12%.
  3. 3. The method for preparing the konjac glucomannan modified pea starch glass fiber sizing agent according to claim 1, wherein the mass percentage concentration of the konjac glucomannan solution is 1-2%.
  4. 4. The method for preparing the konjac glucomannan modified pea starch glass fiber sizing agent according to claim 1, wherein the silane coupling agent S300 is gamma-aminopropyl triethoxysilane, and the addition amount of the silane coupling agent is 0.5-1% of the total mass of the pea starch solution and the konjac glucomannan solution.
  5. 5. The method for preparing the konjac glucomannan modified pea starch glass fiber sizing agent according to claim 1, wherein the plasticizer is glycerol and the addition amount of the plasticizer is 3-5% of the mass of the mixed solution.
  6. 6. The method for preparing the konjac glucomannan modified pea starch glass fiber sizing agent according to claim 1, wherein the lubricant is vegetable wax and the adding amount of the lubricant is 1-2% of the mass of the mixed solution.
  7. 7. The method for preparing the konjac glucomannan modified pea starch glass fiber sizing agent according to claim 1, wherein the antistatic agent S400 is choline dihydrogen phosphate, and the addition amount of the antistatic agent is 0.5-1% of the mass of the mixed solution.
  8. 8. A glass fiber sizing agent, characterized in that the sizing agent is prepared by the preparation method of the konjak glucomannan modified pea starch glass fiber sizing agent according to any one of claims 1 to 7.
  9. 9. The glass fiber sizing agent according to claim 8, wherein the glass fiber sizing agent has a solid content of 12-15% and a viscosity of 150-300 mPa-s.
  10. 10. The use of a glass fiber sizing agent according to claim 8 or 9, characterized in that it is used in the field of glass fiber tank furnace drawing or textile processing.

Description

Preparation method of konjak glucomannan modified pea starch glass fiber impregnating compound Technical Field The invention belongs to the technical field of glass fiber surface treatment agents, and particularly relates to a preparation method of a konjak glucomannan modified pea starch glass fiber sizing agent. Background Under the strategic background of 'two carbons', the glass fiber industry is faced with environmental protection transformation pressure. Traditional petroleum-based impregnating compounds (such as epoxy emulsion, polyurethane and the like) depend on non-renewable resources, the carbon emission in the production process is high, the biodegradation is difficult, and the environmental burden is heavy. In the existing bio-based impregnating compound, starch film forming agents are concerned because of the characteristics of wide sources, reproducibility, degradability and the like, but the performance difference of different starch base materials is remarkable. Corn starch is used as a traditional raw material, has the advantages of general film forming performance, easy regeneration, insufficient water resistance and mechanical strength, and high film forming brittleness and weak adhesive force although the viscosity of the tapioca starch is high. Compared with the prior art, the pea starch has the remarkable advantages that (1) the high amylose content is that the pea starch amylose content (about 35% -65%) is remarkably higher than that of corn starch (about 25% -30%) and tapioca starch (about 17% -20%), so that the pea starch has the advantages of being compact in film formation, high in hardness and good in water resistance, (2) the excellent film forming property and flexibility are that the pea starch has a regular molecular structure, the formed film is uniform and strong in adhesive force, the flexibility is better than that of corn starch and tapioca starch, the pea starch is more suitable for a high-speed wire drawing process, (3) the regeneration speed of the pea starch after gelatinization is low, the system stability is good, the storage and construction of sizing agents are facilitated, 4) the environment protection and the sustainability are that the pea is crop rotation, the carbon fixation capacity in the planting process is strong, the energy consumption in the starch production process is low, the carbon footprint is smaller than that of the corn starch processing, the compatibility is good, the pea starch and the natural polysaccharide are excellent, the three-dimensional network structure is easy to construct by means of esterification, grafting and the like, and the comprehensive performance is improved. However, the pure pea starch impregnating compound still has the problems of insufficient film forming strength, high broken silk rate, poor process adaptability and the like. The existing modified starch impregnating compound mostly adopts modifying agents such as gelatin, chitosan, silica gel and the like, and has the problems of complex process, high cost, dependence on chemical crosslinking agents and the like although the modified starch impregnating compound has a certain effect. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention aims to provide an environment-friendly, high-performance and all-biological-based glass fiber sizing agent, solves the problems of large pollution, poor film forming property, complex process and the like of the traditional starch sizing agent in the prior art, and realizes the green low-carbon transformation of the glass fiber sizing agent. In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a konjac glucomannan modified pea starch glass fiber sizing agent, the method comprising the steps of: s100, adding water into pea starch, and gelatinizing for 30 minutes at 85 ℃ to prepare pea starch solution; S200, adding water into konjak glucomannan, stirring and dissolving at 60 ℃ to prepare konjak glucomannan solution; S300, mixing pea starch solution and konjak glucomannan solution according to a mass ratio of 4:1, adding a silane coupling agent, and carrying out esterification grafting reaction for 1 hour at 75 ℃ to obtain a mixed solution; S400, adding a plasticizer, a lubricant and an antistatic agent into the mixed solution, and homogenizing at a high speed to obtain the sizing agent. Further, the concentration of the pea starch solution in the S100 is 8-12% by mass. Further, the mass percentage concentration of the konjak glucomannan solution in the step S200 is 1-2%. Further, the silane coupling agent in S300 is gamma-aminopropyl triethoxysilane, and the addition amount of the silane coupling agent is 0.5-1% of the total mass of the pea starch solution and the konjak glucomannan solution. Further, the plasticizer in S400 is glycerol, and the addition amount of the plasticizer is 3-5% of the mass of the mixed