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Preparation method of konjak powder-chitosan-PVA mixed binder

A technology of chitosan and konjac flour is applied in the field of polymer chemistry, which can solve the problems of restricting development and insufficient bonding strength, and achieve the effects of low production cost, easy mass production and mild conditions.

Active Publication Date: 2015-10-14
江苏金玉丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But the cohesive strength of konjac flour-chitosan-PVA blended adhesive obtained at present is not good enough, which restricts its development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of preparation method of konjac flour-chitosan-PVA blend adhesive comprises the following steps:

[0018] (1) Prepare a PVA solution with a mass fraction of 10%: Swell PVA and pure water at room temperature for 5 minutes at a mass ratio of 1:9, then raise the temperature of the swollen solution to 90°C and keep it at a constant temperature for 20 minutes to completely dissolve it. The temperature is lowered to 25°C for sealing, that is, a PVA solution with a mass fraction of 10% is made; wherein, the selected PVA has a degree of polymerization ≥ 1700 and a degree of alcoholysis of 97%.

[0019] (2) add 40 parts of konjac flour and 300 parts of deionized water in the container, be warming up to 65 DEG C, be stirred under the stirring condition of 200r / min at the rotating speed and become konjac solution, add 40 parts of chitosan in the konjac solution, Stir continuously to dissolve or fully swell the chitosan, adjust the pH value to 4, add 2 parts by weight of an ...

Embodiment 2

[0022] A kind of preparation method of konjac flour-chitosan-PVA blend adhesive comprises the following steps:

[0023] (1) Prepare a PVA solution with a mass fraction of 10%: Swell PVA and pure water at room temperature for 10 minutes at a mass ratio of 1:9, then raise the temperature of the swollen solution to 90°C and keep it at a constant temperature for 30 minutes to completely dissolve it. Cool down to 25°C for sealing, that is, make a PVA solution with a mass fraction of 10%; wherein, the selected PVA has a degree of polymerization ≥ 1700 and a degree of alcoholysis of 97%;

[0024] (2) add 60 parts of konjac powder and 200 parts of deionized water in the container, be warming up to 75 ℃, be stirred under the stirring condition of 220r / min at the rotating speed and become konjac solution, add 60 parts of chitosan in the konjac solution, Stir continuously to dissolve or fully swell the chitosan, adjust the pH value to 6, add 3 parts by weight of an initiator and stir for...

Embodiment 3

[0027] A kind of preparation method of konjac flour-chitosan-PVA blend adhesive comprises the following steps:

[0028] (1) Prepare a PVA solution with a mass fraction of 10%: Swell PVA and pure water at room temperature for 8 minutes at a mass ratio of 1:9, then raise the temperature of the swollen solution to 90°C and keep it at a constant temperature for 25 minutes to completely dissolve it. The temperature is lowered to 25°C for sealing, that is, a PVA solution with a mass fraction of 10% is made; wherein, the selected PVA has a degree of polymerization ≥ 1700 and a degree of alcoholysis of 97%.

[0029] (2) add 50 parts of konjac flour and 250 parts of deionized water in the container, be warming up to 70 ℃, be stirred under the stirring condition of 210r / min at the rotating speed and become konjac solution, add 50 parts of chitosan in the konjac solution, Stir continuously to dissolve or fully swell chitosan, adjust the pH value to 5, add 2-3 parts by weight of an initia...

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Abstract

The invention discloses a preparation method of a konjak powder-chitosan-PVA mixed binder and relates to the technical field of binder preparation. The preparation method comprises 1, preparing a PVA solution with a mass fraction of 10%, 2, carrying out blending polymerization on konjak powder and chitosan in the solution, and 3, adding the PVA solution and a cross-linking agent chloropropylene oxide solution into the blended polymer and carrying out stirring at a temperature of 60-70 DEG C for 1.5-2h to obtain the mixed binder. The konjak powder-chitosan-PVA mixed binder has the advantages of high bonding strength, good water resistance and good stability, can be widely used in the fields of timber assembling and wood-based plate processing and can also be used in the field of water resistance and packaging.

Description

technical field [0001] The invention relates to the field of polymer chemistry, in particular to a preparation method of konjac flour-chitosan-PVA blended adhesive. Background technique [0002] Among the currently used wood adhesives, many are solvent-based three-aldehyde glues --- urea-formaldehyde resin (UF), phenolic resin (PF) and melamine-formaldehyde resin (VIF). In short, a large amount of formaldehyde is released during production and use, which has a great impact on environmental pollution. Long-term human exposure will also cause the risk of respiratory diseases, malignant tumors, leukemia and other diseases. With the introduction of the concept of environmental protection and energy saving, higher requirements have been put forward for the glue used in the wood industry, which requires the reduction of formaldehyde monomer and dosage, so that the free formaldehyde content in the adhesive can reach the minimum standard, or seek suitable raw materials and formulas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J105/00C09J105/08C09J129/04C09J11/06
Inventor 王超群
Owner 江苏金玉丰新材料有限公司
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