Method for preparing starch gum used for straw fiber products

A technology of straw fiber and starch glue, applied in the direction of starch adhesive, adhesive type, etc., can solve the problems of harsh use process conditions, unsuitable for straw fiber, immature manufacturing process, etc., achieve low cost and benefit plants Effects of Growth, Strong Social Value, and Economic Value

Inactive Publication Date: 2009-08-26
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention 200610045348 discloses a method for producing boards from crop straws, which includes raw material processing, shaving preparation, glue mixing, paving, hot pressing, pre-treatment, and finished product treatment steps. However, although there are many types of glue used in the glue mixing process, However, all of them have poor water resistance, contain formaldehyde, and are not suitable for straw fibers due to harsh operating conditions. Although the currently popular isocyanate adhesives have good bonding effects, they are expensive, immature manufacturing processes, toxic and difficult to release.

Method used

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  • Method for preparing starch gum used for straw fiber products

Examples

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Effect test

Embodiment 1

[0013] Take 1kg of starch and 4L of water, add 20g of NaOH, stir for about 15 minutes, add 100ml of hydrogen peroxide with a volume fraction of 30% (commercially available hydrogen peroxide is bottled hydrogen peroxide with a volume ratio of 30%), heat to 65°C in a water bath, stir fully, and wait until no Until obvious bubbles appear, adjust the pH to 6 with 5wt% sulfuric acid, add 150g urea, 30g MgCl 2 , 100ml of glyoxal, the temperature was raised to 90°C, stirred and heated for 30min, then added 20g of sodium hexametaphosphate, 50g of sodium dodecylsulfonate, 40g of PVA (dissolved in hot water in advance), kept the temperature and stirred for 30min, and finally Add 200g of dissolved CMC to the reaction solution, heat and stir at 65°C for 1 hour, add appropriate amount of water during the preparation process to ensure that the volume of the starch glue is about 5L, cool down, and the glue will come out. Using the finished product of this embodiment to bond straw fibers is s...

Embodiment 2

[0016] Add 0.1kg NaOH to the aqueous solution of 1kg starch at room temperature, stir for 15 minutes, then add 0.6kg hydrogen peroxide, stir the resulting mixed solution in a water bath at 50°C until no bubbles are generated, then use hydrochloric acid to adjust the pH of the mixed solution to 5, and then mix Add 1kg urea, 0.2kg MgCl to the solution 2 , 1kg glyoxal, heat the mixed solution to 90°C in a water bath, stir for 30min, then add 1kg sodium hexametaphosphate, 0.2kg polyvinyl alcohol PVA, 0.2kg sodium dodecylsulfonate, keep stirring at 90°C for 30min, and finally add 2kg of carboxymethyl fiber CMC that has been dissolved is cooled to 60°C, stirred for 1 hour, and an appropriate amount of water is added during the period to ensure that the pot is not dry. Finally, dehydration is performed to the required concentration, and the temperature is lowered to produce glue.

[0017] The finished product was dropped from a height of 3 meters without cracks; soaked in water for 1...

Embodiment 3

[0019] Add 0.2 kg NaOH to 1 kg starch aqueous solution at room temperature, stir for 15 minutes, then add 1.2 kg hydrogen peroxide, stir the resulting mixed solution in a water bath at 50°C until no bubbles are generated, then use phosphoric acid to adjust the pH of the mixed solution to 5.5, and then mix Add 2kg urea, 0.7kg MgCl to the solution 2 , 2kg glyoxal, heat the mixed solution to 90°C in a water bath, stir for 30min, then add 1.6kg sodium hexametaphosphate, 0.6kg polyvinyl alcohol PVA, 0.8kg sodium dodecylsulfonate, keep stirring at 90°C for 30min, and finally Add 4kg of dissolved carboxymethyl fiber CMC, cool down to 60°C, stir for 1 hour, add appropriate amount of water during this period to ensure that the pot is not dry, and finally perform dehydration to the required concentration, cool down, and glue out.

[0020] The finished product was dropped from a height of 1.8 meters without cracks; soaked in water for 22 days, it softened slightly but did not disperse. ...

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Abstract

The invention relates to a method for preparing starch gum used for straw fiber products, comprising the steps: NaOH is added into starch aqueous solution at the room temperature to be stirred for 15min; then, hydrogen peroxide is added into the mixed solution, and the obtained mixed solution is stirred at 50-70 DEG C in water bath until no bubble is generated; after that, the pH of the mixed solution is adjusted to be 5-6 by using acid liquor, and carbamide, MgCl2, oxalic aldehyde, sodium hexametahposphate, polyvinyl alcohol (PVA), dodecyl sodium sulfate and dissolved carboxymethyl cellulose (CMC) are sequentially added into the mixed solution and stirred for 1h when the temperature is lowered to 60 DEG C, and a right amount of water is added into the mixed solution at the same time, thus the pot is not dried out; finally, dehydration action is carried out until the obtained solution reaches the needed concentration, and temperature reduction as well as gum exudation are carried out. The product obtained by the method provided by the invention has better viscocity and fluidness as well as simple manufacturing technique, is especially suitable for making the straw fiber products; after being solidified, the final straw products have the advantages of low cost, great hardness, degradation property and good water resisting property.

Description

1. Technical field [0001] The invention belongs to a preparation method of starch glue for straw fiber products, in particular to a preparation method of an environment-friendly water-resistant oxidized starch glue. The starch glue can be used in the production of straw fiber products such as straw pots, transport pallets and the like. 2. Background technology [0002] Prior art: straw is the general term for the stem and leaf (ear) parts of mature crops. Usually refers to the remaining parts of wheat, rice, corn, potatoes, oilseeds, cotton, sugar cane and other crops after harvesting seeds. More than half of the photosynthetic products of crops exist in straw, which is rich in nitrogen, phosphorus, potassium, calcium, magnesium and organic matter, etc. It is a multi-purpose renewable biological resource, and straw is also a roughage. It is characterized by high crude fiber content (30%-40%), and contains lignin and so on. Although lignin cannot be utilized by pigs and ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J103/02
Inventor 王建国王岩李伟薄录吉
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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