Flexible urea-formaldehyde foam and preparation method thereof

A urea-formaldehyde foam and flexible technology, which is applied in the field of crop seedling and cultivation degradable raw materials and its preparation, can solve the problem that foam cannot be made into foam board, etc., and achieve the effect of good hydrophilicity and simple product formula

Inactive Publication Date: 2015-07-29
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest obstacle that urea-formaldehyde foam cannot be widely used at present is: the formaldehyde / urea molar ratio of the urea-formaldehyde resin used to make high-strength urea-formaldehyde foam must be high, such as formaldehyde / urea mole will exceed 1.7 / 1, resulting in foam during solidification The formaldehyde emission far exceeds the national standard, and the formaldehyde emission can be lower than the national standard by reducing the formaldehyde / urea molar ratio, but the resulting foam cannot be made into a foam board with the required strength

Method used

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  • Flexible urea-formaldehyde foam and preparation method thereof
  • Flexible urea-formaldehyde foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] 1) Add 100 parts of urea-formaldehyde resin into the mold and stir vigorously;

[0032] 2) Add 44 parts of papermaking black liquor to the above resin, stir at high speed to make it foam;

[0033] 3) When the degree of foaming reaches the design requirements, add 6 parts of strong acidic ion exchange resin and continue stirring. Finally, the above-mentioned liquid foam is poured, solidified and dried to obtain a flexible urea-formaldehyde foam matrix.

example 2

[0035] 1) Add 100 parts of urea-formaldehyde resin into the mold and stir vigorously;

[0036] 2) Add 35 parts of papermaking black liquor to the above resin, stir at high speed to make it foam;

[0037] 3) When the degree of foaming reaches the design requirements, add 8 parts of strong acidic ion exchange resin and continue stirring. Finally, the above-mentioned liquid foam is poured, solidified and dried to obtain a flexible urea-formaldehyde foam matrix.

example 3

[0039] 1) Add 100 parts of urea-formaldehyde resin into the mold and stir vigorously;

[0040] 2) Add 45 parts of papermaking black liquor to the above resin, stir at high speed to make it foam;

[0041] 3) When the degree of foaming reaches the design requirements, add 7 parts of strong acidic ion exchange resin and continue stirring. Finally, the above-mentioned liquid foam is poured, solidified and dried to obtain a flexible urea-formaldehyde foam matrix.

[0042] figure 1 and figure 2 Shown are the slices of untoughened urea-formaldehyde foam and the morphology of toughened urea-formaldehyde foam after bending.

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Abstract

The invention relates to a flexible urea-formaldehyde foam and a preparation method thereof, particularly relates to a degradable raw material for seedling culture and cultivation of crops and a preparation method of the degradable raw material. The degradable raw material in the formula comprises the following components: urea-formaldehyde resin, a strongly acid ion exchange resin curing agent, a papermaking black liquid foaming agent and flexibilizer; the preparation method can be realized by adopting the following steps: firstly weighing metered urea-formaldehyde resin solution, adding metered papermaking black liquid to the urea-formaldehyde resin, stirring at a high speed, foaming, adding metered strongly acid ion exchange resin to the mixed liquor, continuously stirring, finally pouring the liquid foam, curing, and then drying to obtain the matrix of the flexible urea-formaldehyde foam. The flexible urea-formaldehyde foam and the preparation method thereof have the advantages as follows: the formula is simple, the obtained urea-formaldehyde foam is high in flexibility and bendable, powdering is avoided, the water-absorbing capacity is great, and high easiness in degradation is achieved, therefore, the flexible urea-formaldehyde foam is very suitable for being used as trays for agricultural seedling culture.

Description

technical field [0001] The invention relates to a degradable raw material for seedling raising and cultivation of crops and a preparation method thereof, in particular to a flexible urea-formaldehyde foam and a preparation method thereof. Background technique [0002] Soilless culture (soilless culture) refers to the cultivation method that does not use natural soil but uses substrate or only substrate when raising seedlings, and irrigates with nutrient solution after planting. It can save land, because soilless cultivation can artificially create a good rhizosphere environment to replace the soil environment, effectively prevent soil continuous cropping diseases and physiological obstacles caused by soil salt accumulation, and fully meet the needs of crops for mineral nutrition, water, gas and other environmental conditions , and the basic materials used for cultivation can be recycled, so it has the characteristics of saving water, fertilizer, labor, high yield and high qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/24C08L101/00C08J9/04
Inventor 张文政宋德智牟江南王丹焱张秋萍张倩茜
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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