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A kind of urea-formaldehyde resin and preparation method thereof

A technology of urea-formaldehyde resin and paraformaldehyde, which is applied in the field of chemical adhesives, can solve the problems of cellulosic ethanol fermentation residue solid waste, not being effectively utilized, and increasing the difficulty of wastewater treatment, so as to achieve resource utilization, manufacturing cost and energy efficiency. The effect of low consumption and mild reaction conditions

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the wastewater also contains high concentrations of inorganic salts, sugars, lignin and other metabolites in the fermentation process. The composition is complex, which increases the difficulty of wastewater treatment.
In addition, in the process of using lignocellulosic raw materials such as straw to prepare cellulosic ethanol, after pretreatment, enzymatic hydrolysis, ethanol fermentation and separation by distillation, solid waste of cellulosic ethanol fermentation residues will be produced, which has not been effectively utilized

Method used

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  • A kind of urea-formaldehyde resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of 37% formaldehyde aqueous solution: Weigh 37 parts by weight of paraformaldehyde and put it into 63 parts by weight of cellulosic ethanol fermentation wastewater, depolymerize at 65°C, and keep warm for 15 minutes after the paraformaldehyde is completely dissolved.

[0033] (2) Preparation of 15% alkali conditioning solution: mix 15 parts by weight of NaOH, 18 parts by weight of cellulosic ethanol fermentation waste residue, and 67 parts by weight of cellulosic ethanol fermentation waste water, heat to boiling state, stop heating, cool and place overnight, After filtering, the filtrate is the alkali conditioning solution.

[0034] (3) Add 40 parts by weight of the first batch of urea, 0.2 parts by weight of polyvinyl alcohol, and 0.01 parts by weight of fatty acid amide to the aqueous formaldehyde solution in step (1), mix well, and use the alkali conditioning solution in step (2) to make The pH of the system was 8.3, and the heating was stopped after ...

Embodiment 2

[0038] (1) Preparation of 30% formaldehyde aqueous solution: Weigh 30 parts by weight of paraformaldehyde and put it into 70 parts by weight of cellulosic ethanol fermentation wastewater, depolymerize at 75°C, and keep warm for 25 minutes after the paraformaldehyde is completely dissolved.

[0039] (2) Preparation of 30% alkali conditioning solution: Take 30 parts by weight of NaOH, 5 parts by weight of cellulosic ethanol fermentation waste residue, and 65 parts by weight of cellulosic ethanol fermentation waste water, heat to boiling state, stop heating, cool and place overnight, After filtering, the filtrate is the alkali conditioning solution.

[0040] (3) Add 27 parts by weight of the first batch of urea, 0.6 parts by weight of polyvinyl alcohol, and 0.04 parts by weight of silicone defoamer to the formaldehyde aqueous solution in step (1), mix well, and use the alkali of step (2) Adjust the solution so that the pH of the system is 8.8, stop heating after heating up to 75°...

Embodiment 3

[0044] (1) Preparation of 32% formaldehyde aqueous solution: Weigh 32 parts by weight of paraformaldehyde and put it into 68 parts by weight of cellulosic ethanol fermentation wastewater, depolymerize at 70°C, and keep warm for 20 minutes after the paraformaldehyde is completely dissolved.

[0045] (2) Preparation of 25% alkali conditioning solution: Take 25 parts by weight of NaOH, 10 parts by weight of cellulosic ethanol fermentation waste residue, and 65 parts by weight of cellulosic ethanol fermentation waste water, heat to boiling state, stop heating, cool and place overnight, After filtering, the filtrate is the alkali conditioning solution.

[0046] (3) Add 29.2 parts by weight of the first batch of urea, 0.5 parts by weight of polyvinyl alcohol, and 0.03 parts by weight of polyether defoamer to the aqueous formaldehyde solution in step (1), mix well, and adjust with step (2) alkali solution to make the pH of the system 8.6, stop heating after heating up to 75°C, and re...

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Abstract

The invention relates to a urea-formaldehyde resin and a preparation method thereof. The preparation method comprises the following steps: (1) preparing an aqueous formaldehyde solution; (2) preparingan alkali adjustment solution; (3) adding the first batch of urea, polyvinyl alcohol and an antifoaming agent into the aqueous formaldehyde solution, carrying out uniform mixing, adding alkali to adjust a pH value to 8 to 9 and carrying out a reaction for 30 to 40 min; (4) adjusting a pH value to 4 to 5, carrying out a reaction for 30 to 40 min, adding the second batch of urea and melamine when asample becomes cloudy after dropped into water, and when another sample becomes cloudy after dropped into water, adding alkali to adjust a pH value to 5-6, adding the third batch of urea, and carrying out a reaction at 80-90 DEG C for 30-40 min; and (5) carrying out cooling to 70-75 DEG C, adding the fourth batch of urea, adding alkali to adjust a pH value to 8 to 9, and then carrying out coolingand discharging to obtain the urea-formaldehyde resin. The preparation method of the invention adopts a weak alkali-weak acid-weak alkali process and utilizes a cellulosic ethanol fermentation wastewater and waste residues for preparation of the urea formaldehyde resin; and the preparation method is simple in process, and the content of free formaldehyde is low.

Description

technical field [0001] The invention belongs to the technical field of chemical adhesives, and in particular relates to a method for preparing urea-formaldehyde resin from cellulosic ethanol fermentation waste. Background technique [0002] Urea-formaldehyde resin has the advantages of abundant and easy-to-obtain raw materials, low production cost, fast curing, and high bonding strength, and is widely used in plywood, particleboard, fiberboard and other wood-based panel industries. With the improvement of people's living standards and the improvement of home environment requirements, the issue of formaldehyde release from urea-formaldehyde resins has become the focus of attention. In order to meet the needs of the market and consumers, the research and development of urea-formaldehyde resins with low formaldehyde emission or low free formaldehyde has become a hot spot, and are widely used in the production of wood-based panels and furniture. At present, there are many low-f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/12
CPCC08G12/12C08G12/40
Inventor 白富栋张跃严生虎陈代祥李政沈介发李国庆
Owner CHINA PETROLEUM & CHEM CORP