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Preparation method of environment-friendly urea-formaldehyde resin

A urea-formaldehyde resin, environmentally friendly technology, applied in the field of chemistry, can solve problems such as health effects and toxicity, and achieve the effect of good use performance and comprehensive performance improvement.

Active Publication Date: 2020-01-07
山东省科特尔新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of urea-formaldehyde resin cannot be ignored. Because the raw material contains formaldehyde, it will release toxic formaldehyde gas during the production and use of plywood, which has a great impact on people's health.

Method used

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  • Preparation method of environment-friendly urea-formaldehyde resin
  • Preparation method of environment-friendly urea-formaldehyde resin
  • Preparation method of environment-friendly urea-formaldehyde resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The influence of various acidic catalysts of embodiment 1 on the various performances of urea-formaldehyde resin

[0054] With the urea-formaldehyde ratio being 1.20 and the batch-feeding ratio of urea being 55:35:10, different acidic catalysts such as formic acid, acetic acid, hydrochloric acid, ammonium chloride, ammonium sulfate and trifluoromethanesulfonic acid were added to the reaction system to synthesize urea-formaldehyde resins, The impact of various catalysts on the free formaldehyde content of urea-formaldehyde resin is shown in the table below:

[0055] The influence of table 2 catalyst on free formaldehyde content

[0056]

[0057] It can be clearly seen from the above table that the data of free formaldehyde content determination is within the error range, and the accuracy is relatively high. According to above-mentioned table various catalyzers gained free formaldehyde content mean plots, obtain the impact of catalyst on free formaldehyde content as f...

Embodiment 2

[0059] The influence of embodiment 2 catalyst on bonding strength

[0060] With the urea-formaldehyde ratio being 1.20 and the batch-feeding ratio of urea being 55:35:10, different acidic catalysts such as formic acid, acetic acid, hydrochloric acid, ammonium chloride, ammonium sulfate and trifluoromethanesulfonic acid were added to the reaction system to synthesize urea-formaldehyde resins, Gained urea-formaldehyde resin adds 1% ammonium chloride solidifying agent, then prepares plywood, measures the plywood bonding strength that obtains as shown in the following table:

[0061] The influence of table 3 catalyst on bonding strength

[0062]

[0063] The effect of the catalyst on the bond strength is as figure 2 shown. From figure 2 It can be clearly seen that the effect on improving the bonding strength of urea-formaldehyde resin is: trifluoromethanesulfonic acid > formic acid > ammonium chloride > hydrochloric acid > ammonium sulfate > acetic acid. It can be seen tha...

Embodiment 3

[0064] The influence of embodiment 3 catalyst on solid content and curing time

[0065] With the urea-formaldehyde ratio of 1.20 and the urea batch feeding ratio of 55:35:10, different acidic catalysts were added to the reaction system: formic acid, acetic acid, hydrochloric acid, ammonium chloride, ammonium sulfate, trifluoromethanesulfonic acid to synthesize urea-formaldehyde resin , the effects of various catalytic systems on solid content and curing time are shown in the table below:

[0066] The influence of table 4 catalyst on curing time and solid content of urea-formaldehyde resin

[0067]

[0068] It can be observed from the above table that the acidic catalyst has little effect on the solid content and curing time of the urea-formaldehyde resin. Integrating free formaldehyde and bonding strength, the urea-formaldehyde resin adhesive synthesized with trifluoromethanesulfonic acid as the catalyst has excellent performance and is more suitable.

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Abstract

The invention discloses a preparation method of an environmental-friendly urea-formaldehyde resin. The preparation method comprises synthesis steps of alkali-acid-alkali. According to the preparation method, trifluoromethanesulfonic acid (CF3SO3H) is taken as a catalyst, and melamine is added as a modifier so as to obtain the best acidic catalyst and the optimum synthesis technology, and the environmental-friendly urea-formaldehyde resin is obtained. The content of free formaldehyde in a prepared urea-formaldehyde resin adhesive is as high as 0.19%, the bonding strength is capable of achieving 1.06MPa, the formaldehyde release amount is 1.17mg / L, is capable of satisfying E1 grade requirements in GB / T 9846.3-2004, and according with environmental protection application conditions.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and in particular relates to adhesives, in particular to a preparation method of urea-formaldehyde resin. Background technique [0002] Urea-formaldehyde resin refers to the addition and polycondensation of urea and formaldehyde under the action of a catalyst (basic or acidic catalyst) to form an initial urea-formaldehyde resin, and then forms an insoluble and infusible final thermosetting resin under the action of a curing agent or heating. [0003] The synthesis of urea-formaldehyde resin is mainly composed of two parts, namely the generation stage of methylol urea (addition reaction) and the resinization stage (condensation reaction). Addition reaction is under neutral or slightly alkaline conditions, formaldehyde molecules form ions under alkaline conditions NH with formaldehyde 2 The non-shared electrons of the N atom in the phase coordinate addition to carry out a methylolation react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/38C09J161/30
CPCC08G12/38C09J161/30
Inventor 俞丽珍丁建军吴懂飞左晓兵宁春花陈希腾李磊
Owner 山东省科特尔新材料有限公司