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Method for fabricating acidolysis acetylated starch adhesive and application of acidolysis acetylated starch adhesive

A kind of technology of acetylated starch and production method, applied in the direction of adhesives, adhesive types, grafted polymer adhesives, etc., can solve the problems of appearance, bonding strength and water resistance to be improved, achieve good appearance, improve Effect of improving appearance and bonding strength

Inactive Publication Date: 2014-08-27
东莞建泰生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The starch glue prepared by this process has the advantages of low price and environmental protection. The bonding strength of the starch glue has reached the national standard, but its appearance, bonding strength, and water resistance need to be improved in order to be applied industrially.

Method used

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  • Method for fabricating acidolysis acetylated starch adhesive and application of acidolysis acetylated starch adhesive
  • Method for fabricating acidolysis acetylated starch adhesive and application of acidolysis acetylated starch adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Recipe (by mass):

[0019] Technological process: Add waxy cornstarch to 0.75mol / L hydrochloric acid aqueous solution to prepare 30-40% starch milk and carry out acid hydrolysis. Use sodium hydroxide solution to adjust the pH to 8.0 to 8.4, slowly add acetic anhydride which accounts for 6% of the dry weight of starch, and react at 25°C for 1 hour; after the reaction, adjust the pH of the system to 6.5, and use ammonium persulfate as the trigger agent, maintain the pH at 4.0, and pre-initiate for 30 minutes in a 70°C water bath. Prepare a polyvinyl alcohol (PVA) solution with a mass concentration of 10%, mix it evenly with the starch paste, adjust the pH=4.0 with NaOH solution, start to drop vinyl acetate monomer after stabilization, and carry out grafting reaction in a water bath at 70°C. The reaction time is 3 hours, the vinyl acetate monomer addition time is 1.5 hours, and a certain amount of initiator is added after the monomer addition is completed. A certain am...

Embodiment 2

[0022] Recipe (by mass):

[0023] Technological process: Add ordinary cornstarch into 0.75mol / L hydrochloric acid aqueous solution to prepare 30-40% starch milk and carry out acid hydrolysis. Use sodium hydroxide solution to adjust the pH to 8.0 to 8.4, slowly add acetic anhydride which accounts for 6% of the dry weight of starch, and react at 25°C for 1 hour; after the reaction, adjust the pH of the system to 6.5, and use ammonium persulfate as the trigger agent, maintain the pH at 4.0, and pre-initiate for 30 minutes in a 70°C water bath. Prepare a polyvinyl alcohol (PVA) solution with a mass concentration of 10%, mix it evenly with the starch paste, adjust the pH=4.0 with NaOH solution, start to drop vinyl acetate monomer after stabilization, and carry out grafting reaction in a water bath at 70°C. The reaction time is 3 hours, the monomer dropping time is 1.5 hours, and a certain amount of initiator is added after the monomer dropping is completed. A certain amount of ...

Embodiment 3

[0025] Recipe (by mass):

[0026] Technological process: Add tapioca starch to 0.75mol / L aqueous hydrochloric acid solution to make 30-40% starch milk and carry out acid hydrolysis. Use sodium hydroxide solution to adjust the pH to 8.0 to 8.4, slowly add acetic anhydride which accounts for 6% of the dry weight of starch, and react at 25°C for 1 hour; after the reaction, adjust the pH of the system to 6.5, and use ammonium persulfate as the trigger agent, maintain the pH at 4.0, and pre-initiate for 30 minutes in a 70°C water bath. Prepare a polyvinyl alcohol (PVA) solution with a mass concentration of 10%, mix it evenly with the starch paste, adjust the pH=4.0 with NaOH solution, start to drop vinyl acetate monomer after stabilization, and carry out grafting reaction in a water bath at 70°C. The reaction time is 3 hours, the monomer dropping time is 1.5 hours, and a certain amount of initiator is added after the monomer dropping is completed. A certain amount of cross-link...

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Abstract

The invention discloses a method for fabricating an acidolysis acetylated starch adhesive and application of the acidolysis acetylated starch adhesive, and belongs to the technical field of preparation of adhesives. The fabrication method disclosed by the invention comprises the following steps: 1, firstly, carrying out acid leaching on starch by a hydrochloric acid, and then adding an acetic oxide, so as to obtain the starch modified by acidolysis acetylation; 2, preparing an emulsion from the acidolysis acetylated starch, adding an initiator and mixing with a polyvinyl alcohol solution and then carrying out graft copolymerization together with a vinyl acetate monomer; 3, carrying out cross-linking reaction together with an N-hydroxymethyl acrylamide crosslinking agent, and finally adding additives to obtain the starch adhesive for wood with excellent performance. The adhesive prepared by the method is superior to a white emulsion in appearance, mobility and wood polluting property, and good in freeze-thaw stability and clay stability, and can be widely applied to bonding of wood.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a preparation method and application of an acid-decomposed acetylated starch adhesive. Background technique [0002] Starch is a non-polluting, biodegradable, low-cost renewable resource and has been industrially produced for corrugated paper bonding applications. However, traditional starch glue has disadvantages such as slow drying speed, low bonding strength, poor water resistance, and easy deterioration, which limits its application in wood adhesives. Chinese patent CN1687279A "A preparation method of starch glue for wood" proposes a process of using starch as the main raw material, carrying out acidolysis, oxidation, graft copolymerization modification, and finally adding certain auxiliary agents to prepare starch glue. The starch glue prepared by this process has the advantages of low price and environmental protection. The bonding strength of the starch glue has reached...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/02C08F251/00C08F218/08C08F220/58C08B31/04
Inventor 成艳丽刘振宗闵立芳李航李佳佳
Owner 东莞建泰生物科技有限公司
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