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Modified corn straw flame-retardant degradable foam material and preparation method thereof

A technology of corn stalks and foaming materials, which is applied in the field of foaming materials, can solve the problems of flammability, unsatisfactory mechanical properties and application properties, and low product strength, and achieve low preparation costs, good flame retardancy, and considerable economic benefits Effect

Active Publication Date: 2020-01-14
NORTHWEST UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the use of corn stalks is mainly to simply process the corn stalks or directly use the corn stalks to be crushed and mixed with starch and other adhesives, foaming agents and additives to foam. The product has low strength, flammability, and mechanical properties. Application performance is not ideal

Method used

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  • Modified corn straw flame-retardant degradable foam material and preparation method thereof
  • Modified corn straw flame-retardant degradable foam material and preparation method thereof
  • Modified corn straw flame-retardant degradable foam material and preparation method thereof

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preparation example Construction

[0040] In order to improve the various performances of the existing corn stalk foaming materials and break through the limitations of the use of the existing corn stalk foaming materials, the present invention provides a modified corn stalk foaming material with good comprehensive performance and the foaming material Preparation. The specific preparation process includes the following steps.

[0041] Step 1: Esterifying and grafting the corn stalks to obtain the esterification-grafting modified corn stalks.

[0042] In the present invention, a kind of modified corn stalks capable of preparing foaming materials with good flame retardant properties is provided, which is prepared by esterification and graft modification of corn stalks, and the preparation of esterification-grafting modified corn stalks includes The following steps:

[0043] Step 1, pretreating corn stalks;

[0044] Step 2, esterifying the pretreated corn stalks to obtain esterified corn stalks;

[0045] Step ...

Embodiment 1

[0109] Prepare pretreated corn stover:

[0110] The corn stalks are washed with clean water, dried, crushed, and passed through a 100-mesh standard sieve to obtain corn stalk powder. Add corn stalk powder into a mixed solution of an appropriate amount of 2.5mol / L sodium hydroxide solution and 0.4mol / L anhydrous sodium sulfite solution, the molar ratio of sodium hydroxide and anhydrous sodium sulfite is 5:1, boil and reflux for 7h.

[0111] After the reaction, the reaction solution was cooled to room temperature, and the reaction solution was filtered with suction, washed with deionized water and filtered 5 times, rinsed with absolute ethanol, and vacuum-dried at 80°C for 4 hours to obtain pretreated corn stalks .

Embodiment 2

[0113] Preparation of esterification-grafted modified corn stover:

[0114] Add 1 mol of imidazole formic acid to 1.2 mol of thionyl chloride while stirring, and reflux at 60°C for 5 hours to obtain imidazole formic acid chloride.

[0115] Weigh 3.9g of the pretreated corn stalks of Example 1, 9.5g of imidazole formyl chloride and 8g of triethylamine into a reaction kettle, add 300mL of N,N-dimethylformamide, heat to 40°C, and stir evenly. Then add 0.5g of 4-dimethylaminopyridine, heat to 55°C for esterification reaction for 6 hours, suction filter after the reaction, wash with deionized water and absolute ethanol three times each, and dry in a vacuum oven at 80°C for 3 hours Finally, the esterified corn stalks are obtained and placed in a desiccator for subsequent use.

[0116] Take the above product and add it to 2.6g of chloropropene, stir it magnetically, heat it to 65°C for grafting reaction, carry out the reaction for 24 hours, remove excess chloropropene by rotary evap...

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Abstract

The invention provides a foaming material prepared from modified corn straw. The foaming material prepared from the modified corn straw can be naturally degraded. The problem of flammability of the foaming material produced from the corn straw at present is solved by esterification grafting modification of the corn straw, and the foaming material has good compression resistance and high rebound rate. The modified corn straw foaming material has good comprehensive application performance, can be popularized and applied in buffering, shock-proof, fire-proof and heat-insulating packaging materials, and has practical significance for comprehensive utilization of agricultural waste straw.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a modified corn stalk, a foaming material prepared therefrom and a preparation method thereof. Background technique [0002] Synthetic foamed plastics are widely used in many industries such as packaging, transportation, and construction because of their low density, light weight, easy molding, and impact resistance. However, synthetic foam materials have stable chemical properties and are very difficult to degrade under natural conditions after use and disposal, causing serious "white pollution" and also causing consumption of non-renewable resources and energy such as oil and natural gas. Recycling and degradation requires a lot of cost, so seeking environmentally friendly green packaging materials has become the focus of research in various countries. [0003] Because straw is rich in elements such as nitrogen, phosphorus, and potassium, as well as organ...

Claims

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Application Information

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IPC IPC(8): C08L51/00C08H8/00C08F289/00C08F220/56C08J9/10C08J9/12
CPCC08J9/102C08F289/00C08J2203/04C08F285/00C08K5/12C08J2333/26C08J2451/00C08F220/56C08F214/14
Inventor 苏琼王彦斌梁双王鸿灵庞少峰孙初锋吴尚魏亚军贺丰洋孙希阳袁苗苗
Owner NORTHWEST UNIVERSITY FOR NATIONALITIES
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