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A kind of preparation method of urea-formaldehyde foam material modified by shellac waste slag glue

A technology of urea-formaldehyde foam and shellac, which is applied in the field of preparation of urea-formaldehyde foam materials, can solve problems such as waste of natural resources, waste of shellac residue glue, performance defects, etc., and achieves improvement of brittleness and cracking, low biodegradability, good The effect of mechanical properties

Active Publication Date: 2021-01-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the lac slag after extracting lac jatrophic acid can only be discarded or burned as fuel in the prior art, and the precious natural resources are extremely wasted, in order to overcome the performance defects of the existing urea-formaldehyde foam materials

Method used

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  • A kind of preparation method of urea-formaldehyde foam material modified by shellac waste slag glue
  • A kind of preparation method of urea-formaldehyde foam material modified by shellac waste slag glue
  • A kind of preparation method of urea-formaldehyde foam material modified by shellac waste slag glue

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A kind of preparation method of the urea-formaldehyde foam material modified by lac waste slag glue, concrete operation steps are:

[0041] (1) Treatment of waste lac residue: heat waste lac residue at 80°C for 12 hours in a vacuum to remove moisture from waste lac residue (WS) to obtain dehydrated waste lac residue (referred to as T-WS ).

[0042] (2) Preparation of shellac waste slag modified urea-formaldehyde resin: (a) 100g of formaldehyde solution (37%) was added to the reaction flask, 3.5g of hexamethylenetetramine was added, and 30% NaOH solution was added dropwise under stirring to pH 7.5, heat up to 40°C, add the first batch of 24g of urea and T-WS mixture (T-WS / urea mass ratio is 1 / 4), slowly reflux and heat up to 60°C, keep warm for 30min; (b) add the second Batch 12g of urea and T-WS mixture (T-WS / urea mass ratio is 1 / 4), keep it warm for 25min, then rapidly raise the temperature to 85°C within 15min, keep it warm for 25min, adjust the pH to 4.5 with 10% fo...

Embodiment 2

[0045] A kind of preparation method of the urea-formaldehyde foam material modified by lac waste slag glue, concrete operation steps are:

[0046] Adjust the step (2) to: (a) Add 100g of formaldehyde solution (37%) to the reaction flask, add 3.5g of hexamethylenetetramine, add dropwise 30% NaOH solution to pH 8.2 under stirring, and heat up to 45°C , add the first batch of 24g of urea and T-WS mixture (the mass ratio of T-WS / urea is 1 / 3), slowly reflux and heat up to 55°C, and keep warm for 35min; (b) Add the second batch of 12g of urea and T-WS WS mixture (T-WS / urea mass ratio is 1 / 3), keep warm for 35min, then rapidly heat up to 90°C within 20min, keep warm for 35min, adjust the pH to 5.5 with 10% formic acid, and observe the change of liquid viscosity in the reaction bottle, until turbid, immediately with 25-28% NH 3 Adjust the pH to 7.5 with water, and adjust the pH to 8.2 with 30% NaOH solution after dehydration under reduced pressure; (c) Cool to below 60°C, add the thi...

Embodiment 3

[0049] A kind of preparation method of the urea-formaldehyde foam material modified by lac waste slag glue, concrete operation steps are: repeat embodiment 1, only adjust the mass ratio of T-WS / urea in step (2) to 1 / 2, step (3 ) The mass fraction of sodium bicarbonate in ) was adjusted to 2.5% (2.5g), and the amount of its aqueous solution was adjusted to 25g. The measured solid content of WS-UFR is 55.7%, the viscosity is 130s, and the pH value is 7.8; the measured apparent density of WS-URF is 0.26g / cm 3 , Compression strength is 234.4Kpa, free formaldehyde content is 0.23%, no cracking phenomenon, pulverization rate is 3.0%, thermal conductivity is 0.034W / m.K, 28d biodegradation degree is 4.2%.

[0050] figure 1 A is an electron microscope photo of the shellac waste slag modified urea-formaldehyde foam material obtained in this example. It can be seen from the figure that this example can produce a foam material with relatively uniform cell and cell wall thickness.

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Abstract

The invention discloses a preparation method of a shellac waste residue modified urea-formaldehyde foam material. The preparation method comprises: adding formaldehyde, hexamethylenetetramine and a NaOH aqueous solution to a reaction bottle, heating, adding the mixture of urea and dewatered shellac waste residue in three times according to a certain ratio, carrying out a reflux reaction, and adjusting the pH values of each stage of the reaction with formic acid, ammonia water and NaOH; and dissolving and uniformly mixing water, sodium lauryl sulfate, sodium dibutylnaphthalene sulfonate, polyethoxy higher fatty acid (ELB), Span 80, glycerin and the shellac waste residue modified urea-formaldehyde resin under heating stirring, adding an inorganic foaming agent aqueous solution, continuouslystirring and uniformly mixing to form a stable foam emulsion, adding phosphoric acid, stirring and uniformly mixing, pouring into a mold, naturally foaming and curing at a room temperature, demolding,and drying to prepare the shellac waste residue modified urea-formaldehyde foam material. According to the present invention, the prepared shellac waste residue modified urea-formaldehyde foam material has characteristics of uniform foam hole, improved compressive strength, improved brittleness, improved friability, and reduced free formaldehyde content, and still retains the thermal conductivityand the degradability of the urea-formaldehyde foam material.

Description

technical field [0001] The invention relates to a preparation method of a urea-formaldehyde foam material modified by shellac waste slag, in particular to a preparation method of a urea-formaldehyde foam material modified by shellac waste slag after extraction of lac jalitic acid. Background technique [0002] Urea-formaldehyde resin is a linear or bulk polymer resin prepared from urea and formaldehyde under acid or alkaline conditions. Because of its low cost, high hardness, oil resistance, mildew resistance, good insulation and temperature resistance, it is one of the earlier developed thermosetting resins. The urea-formaldehyde foaming material prepared by urea-formaldehyde resin has good heat and sound insulation, water absorption and crisp texture, which makes it have a broad application space in building thermal insulation materials and agricultural and gardening matrix materials. However, urea-formaldehyde foam materials have disadvantages such as high brittleness, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/24C08L93/02C08G12/12C08J9/08
CPCC08G12/12C08J9/08C08J2361/24C08J2493/02
Inventor 唐辉张晓春
Owner KUNMING UNIV OF SCI & TECH
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