Method for preparing biological oil modified urea resin adhesive

A urea-formaldehyde resin and bio-oil technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor water resistance, poor aging resistance and high free formaldehyde release of urea-formaldehyde resin adhesives , to achieve the effect of reducing formaldehyde emission, improving resin performance, and broadening application fields

Inactive Publication Date: 2013-10-16
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for preparing a modified urea-formaldehyde resin wood adhesive using biomass raw material-bio-oil, to solve the shortcomings of urea-formaldehyde resin adhesives such as poor water resistance, poor aging resistance, and high release of free formaldehyde, and to achieve Efficient and high-value utilization of agricultural and forestry biomass resources

Method used

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  • Method for preparing biological oil modified urea resin adhesive
  • Method for preparing biological oil modified urea resin adhesive
  • Method for preparing biological oil modified urea resin adhesive

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preparation example Construction

[0018] The preparation method of bio-oil modified urea-formaldehyde resin that the present invention proposes is described in detail as follows in conjunction with embodiment:

[0019] The preparation method of bio-oil modified urea-formaldehyde resin that the present invention proposes, the mass parts of each component in the raw material used are as follows:

[0020]

[0021] The preparation method comprises the following steps:

[0022] (1) Add formaldehyde, bio-oil and basic catalyst in the same mass parts as above into the reaction vessel, and react at 65-75°C for 20-30 minutes to obtain hydroxymethylated bio-oil;

[0023] (2) Add 75% of the urea according to the above ratio into the reaction vessel, raise the temperature to 85°C, use an acidic pH regulator to adjust the pH of the reaction body in the reaction vessel to 7.5-8.5, and keep warm for 60-90°C. minute;

[0024] (3) Adjust the pH of the reaction system in the reaction vessel to 4.8 to 5.2 with an acidic pH ...

Embodiment 1

[0029] (1) Add 100g of formaldehyde, 25g of bio-oil and 4g of sodium hydroxide into an aqueous solution with a mass concentration of 20% into the reaction vessel, and react at 65°C for 30 minutes to obtain hydroxymethylated bio-oil;

[0030] (2) Add 45g of urea to the above-mentioned hydroxymethylated bio-oil, raise the temperature to 85°C, adjust the pH to 7.5-8.0 with phosphoric acid with a mass concentration of 4%, and keep it warm for 60 minutes;

[0031] (3) Use phosphoric acid with a mass concentration of 4% to adjust the pH to 4.8-5.0, then add 15g of urea, and control the temperature of the system at 90±2°C. Within 60 minutes of the reaction, when the resin is dripped into clean water, it will become white mist and not After dispersing, adjust the pH to 8.0 with 8% sodium hydroxide within 5 minutes, and keep it warm for 10 minutes to obtain bio-oil modified urea-formaldehyde resin.

Embodiment 2

[0033] (1) Add 100g of formaldehyde, 30g of bio-oil and 6g of sodium hydroxide into an aqueous solution with a mass concentration of 30% into the reaction vessel, and react at 70°C for 30 minutes to obtain hydroxymethylated bio-oil;

[0034] (2) Add 48.75g of urea to the above-mentioned hydroxymethylated bio-oil, raise the temperature to 85°C, adjust the pH to 7.5-8.0 with formic acid with a mass concentration of 4%, and keep it warm for 70 minutes;

[0035] (3) Use formic acid with a mass concentration of 4% to adjust the pH to 4.8-5.0, then add 16.25g of urea, and control the system temperature at 90±2°C. Within 60 minutes of the reaction, when the resin is dripped into clear water, it will become white mist and After not dispersing, within 5 minutes, use 8% sodium hydroxide to adjust the pH to 8.0, and keep it warm for 20 minutes to obtain bio-oil modified urea-formaldehyde resin.

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Abstract

The invention relates to a method for preparing biological oil modified urea resin, belonging to the technical field of wood adhesive. The method comprises the following steps of: adding formaldehyde, biological oil and basic catalyst into a reaction container according to specified mass part for reaction so as to obtain hydroxymethylation biological oil; adding 75% of urea in specified mass part into the reaction container, adjusting PH of a reaction system in the reaction container to be 7.5-8.5 by using an acidic PH adjusting agent, and keeping warm; and adjusting PH of the reaction system in the reaction container to be 4.8-5.2 by using the acidic PH adjusting agent, adding 25% of urea in specified mass part; controlling the temperature of the reaction system in the reaction container to be 90 + / - 2 DEG C, after the extracted reaction system is dropped into clear water to form white mist and cannot disperse, adjusting PH to 8.0 by using an alkaline PH adjusting agent, and keeping warm to obtain the biological oil modified urea resin. The method disclosed by the invention is capable of improving water resistance, ageing resistance of the urea resin, increasing stability and reducing formaldehyde release amount.

Description

technical field [0001] The invention belongs to the technical field of wood adhesives, in particular to a preparation method of bio-oil modified urea-formaldehyde resin adhesives. Background technique [0002] With the development of the economy, petrochemical resources are consumed in large quantities, and the resulting shortage of petrochemical resources and environmental pollution have attracted more and more attention. The use of biomass resources to replace petroleum-based products has become a development strategy for countries around the world. Urea-formaldehyde resin is an adhesive for wood-based panels with excellent performance. It has been widely valued for its fast curing speed, low raw material price, simple use method, and good initial bonding strength. It is widely used in wood processing industries such as secondary processing. However, urea-formaldehyde resin has poor water resistance, poor aging resistance, and high brittleness of the adhesive layer. Durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G14/08C09J161/34
Inventor 常建民姚思旭伊江平张继宗高雪景苟进胜张琪
Owner BEIJING FORESTRY UNIVERSITY
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