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Formaldehyde reducing agent for finished product urea-formaldehyde glue and application method thereof

An application method and technology of aldehyde reducer, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of high formaldehyde removal from finished adhesives Expensive prices, obstacles to export and foreign exchange earning, etc., to achieve the effect of promoting use, free formaldehyde content up to standard, and safe to use

Inactive Publication Date: 2013-01-02
王晶 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main manifestations are: 80% of the finished urea-formaldehyde glue with high formaldehyde content does not meet the standard; low viscosity; poor water resistance; the raw material price of the aldehyde-reducing modifier used is very expensive; product competition is fierce; obstacles to export foreign exchange
In the past, the formaldehyde reduction was concentrated in the production process of urea-formaldehyde glue, and there were few or no studies on the removal of high formaldehyde in finished glue.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a) Prepare melamine, sodium chloride and sodium dodecylbenzene sulfonate by weight ratio—melamine 1.24: sodium chloride 1.78: sodium dodecylbenzene sulfonate 0.04, and then grind them evenly Crushed into powder, it becomes SW aldehyde reducer;

[0022] b) Weigh the urea-formaldehyde glue to reduce aldehyde, put it into the reaction kettle, and then follow the weight ratio requirements of urea-formaldehyde glue and aldehyde reducer——urea-formaldehyde glue (produced in Shenyang, neutral): aldehyde reducer=100:5 , put in the ground SW aldehyde reducer and stir evenly;

[0023] c) Slowly adjust the PH with 30% sodium hydroxide solution in the reactor, and keep stirring, and test it with PH test paper to 8.0 at any time;

[0024] d) Under the condition of constant stirring, gradually raise the temperature of the reactor to 50° C., start timing, keep the constant temperature for 30 minutes, and finish. Cool to 30°C and discharge into cylinder.

[0025] Performance comparis...

Embodiment 2

[0033] a) Prepare melamine, sodium chloride, and sodium dodecylbenzenesulfonate in a weight ratio—melamine 1.26: sodium chloride 1.78: sodium dodecylbenzenesulfonate 0.02, and then grind them evenly Crushed into powder, it becomes the formaldehyde reducer;

[0034] b) Weigh the urea-formaldehyde glue to reduce aldehyde, put it into the reaction kettle, and then follow the weight ratio requirements of urea-formaldehyde glue and formaldehyde reducer——urea-formaldehyde glue (produced in Jilin, slightly alkaline): formaldehyde reducer=100: 4. Put in the ground SW aldehyde reducer and stir evenly;

[0035] c) Slowly adjust the pH with 30% sodium hydroxide solution or 40% formic acid solution in the reactor, and keep stirring, and test it to 8.0 with pH test paper at any time;

[0036] d) Under the condition of constant stirring, gradually raise the temperature of the reactor to 55° C., start timing, keep the constant temperature for 30 minutes, and finish. Cool to 35 ° C and disc...

Embodiment 3

[0045] a) Ammonium bicarbonate, melamine, sodium chloride, and sodium dodecylbenzenesulfonate are prepared in a weight ratio—melamine 1.24: sodium chloride 1.778: sodium dodecylbenzenesulfonate 0.04 , and then evenly ground into powder, that is SW formaldehyde reducer;

[0046] b) Weigh the urea-formaldehyde glue to reduce aldehyde, put it into the reaction kettle, and then follow the weight ratio requirements of urea-formaldehyde glue and formaldehyde reducer——urea-formaldehyde glue (made in Dalian, neutral): SW formaldehyde reducer=100: 3. Put in the ground SW aldehyde reducer and stir evenly;

[0047] c) Slowly adjust the PH with 30% sodium hydroxide solution in the reactor, and keep stirring, and test it with PH test paper to 8.0 at any time;

[0048] d) Under the condition of constant stirring, gradually raise the temperature of the reactor to 50° C., start timing, keep the constant temperature for 30 minutes, and finish. Cool to 35 ° C and discharge into a cylinder.

...

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PUM

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Abstract

The invention relates to finished product urea-formaldehyde glue, in particular to a formaldehyde reducing agent for the finished product urea-formaldehyde glue and an application method thereof. The formaldehyde reducing agent comprises the following compositions by weight: 1.24 to 1.28 portions of melamine, 1.78 to 1.80 portions of sodium chloride, and 0.04 to 0.06 portion of dodecyl benzene sulphonic acid. The aldehyde reducing agent is the aldehyde reducing agent applied to reducing formaldehyde content again in the finished product glue. The formaldehyde reducing agent prepared from the melamine, the sodium chloride and the dodecyl benzene sulphonic acid in proportion is added into the finished product urea-formaldehyde glue for one time, the pH is regulated to between 8.0 and 8.2, and the mixture is stirred for 30 to 35 minutes at a temperature between 50 and 55 DEG C and then cooled.

Description

technical field [0001] The invention relates to a finished urea-formaldehyde glue, in particular to a formaldehyde-reducing agent for the finished urea-formaldehyde glue and an application method thereof. Background technique [0002] At present, there are many negative problems in the urea-formaldehyde glue produced in our country. The main manifestations are: 80% of the finished urea-formaldehyde glue with high formaldehyde content does not meet the standard; low viscosity; poor water resistance; the raw material price of the aldehyde-reducing modifier used is very expensive; product competition is fierce; In the past, the formaldehyde reduction was concentrated in the production process of urea-formaldehyde glue, and there were few or no studies on the removal of high formaldehyde in finished glue. Contents of the invention [0003] The object of the present invention is to provide a new formaldehyde reducing agent and its application method which can reduce the formal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/24C09J11/06
Inventor 王晶石元亮卢宗云张俊青石凌超叶英烈
Owner 王晶