CN102417802A - Urea-formaldehyde resin adhesive and preparation method thereof - Google Patents
Urea-formaldehyde resin adhesive and preparation method thereof Download PDFInfo
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- CN102417802A CN102417802A CN2011103736865A CN201110373686A CN102417802A CN 102417802 A CN102417802 A CN 102417802A CN 2011103736865 A CN2011103736865 A CN 2011103736865A CN 201110373686 A CN201110373686 A CN 201110373686A CN 102417802 A CN102417802 A CN 102417802A
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- urea
- resin adhesive
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- formaldehyde resin
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- Chemical And Physical Treatments For Wood And The Like (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
The invention discloses a preparation method of a urea-formaldehyde resin adhesive. In the conventional ordinary urea-formaldehyde adhesive, the common problem that the content of formaldehyde surpasses a certain standard exists, and the content is generally 3-7 percent, so that the adhesive is greatly harmful to human bodies. The urea-formaldehyde resin adhesive consists of the following components in parts by weight: 300-500 parts of urea, 0.3-0.6 part formic acid, 0.3-0.6 part of sodium hydroxide, 4-6 parts of polyvinyl alcohol and the balance of formaldehyde. The method is used for preparing a formaldehyde-free urea-formaldehyde resin adhesive.
Description
Technical field:
invention relates to a kind of glue field that is used for; Be specifically related to a kind of urea-formaldehyde resin adhesive of removing formaldehyde and preparation method thereof.
Background technology:
The glutinous agent of
existing general urea-formaldehyde glue, the problem that ubiquity formaldehyde exceeds standard, general content is at 3-7%; Such glue is very big to the harm of human body.At present furniture is made, the timber factory of veneer sheet, wood veneer, and the sizing agent that is mostly aldehyde-containing type of use, people live in the space of using this glue, very dangerous.
Summary of the invention:
The purpose of
invention provides a kind of preparation method who does not contain formaldehyde, do not have the urea-formaldehyde resin adhesive of objectionable impurities.
Above-mentioned purpose realizes through following technical scheme:
a kind of urea-formaldehyde resin adhesive; Its composition comprises: formaldehyde, urea, formic acid, sodium hydroxide, Z 150PH; The parts by weight 300-500 of described urea; The parts by weight 0.3-0.6 of described formic acid, the parts by weight 0.3-0.6 of described sodium hydroxide, described Z 150PH umber 4-6.
described urea-formaldehyde resin adhesive, the parts by weight 400 of described urea, the parts by weight 0.5 of described formic acid, the parts by weight 0.5 of described sodium hydroxide, described Z 150PH umber 5.
The preparation method of
a kind of urea-formaldehyde resin adhesive at first prepares urea-formaldehyde resin adhesive, and the urea-formaldehyde resin adhesive insulation is dewatered when 70 spend for the first time; Dehydrating amount is between the 5-25%; Deviate from the back and when 40-80 spends, mend in the urea-formaldehyde resin adhesive, carry out above-mentioned remove-subsidy water process repeatedly, make the formaldehyde full scale clearance in the urea-formaldehyde resin adhesive with equivalent zero(ppm) water; Making the formaldehyde content in the urea-formaldehyde resin adhesive is 0, processes the urea-formaldehyde resin adhesive that does not contain formaldehyde.
The preparation method of
described urea-formaldehyde resin adhesive; The described method for preparing urea-formaldehyde resin adhesive is: the parts by weight 400-600 that gets formaldehyde; Get the 45-55% of weight of urea umber 300-500 then; With above-mentioned sodium hydroxide thorough mixing, formaldehyde, urea and aqueous sodium hydroxide solution are heated to 90 degree insulations, then 1/3rd back insulations of secondary input residue urea parts by weight; The adjustment pH value is between 4.3-4.7; Be reacted into glue through high-temperature polycondensation and adjust pH value between 7.5-8.5 afterwards; Drop into urea for the third time and be 1/3rd of residue urea parts by weight; Be incubated after 30 minutes, 1/3rd of the 4th input urea residuals weight umber, insulation to 70 degree are processed urea-formaldehyde resin adhesive.
Beneficial effect:
are the no aldehyde sizing agent produced with the remove-subsidy water law of the present invention 1.; This method is a physical method; So the character of glue is not affected; Its bonding strength, quality guaranteed period, water tolerance etc. all are higher than original glue, and handling the back is 0 because of formaldehyde content, so definitely reached environmental requirement.
the present invention is the single-component emulsion sizing agent that a kind of not aldehyde-containing type objectionable impurities belongs to environment-friendly type; Timber-work behind the gummed can not discharge objectionable impurities formaldehyde; Three-waste free pollution deposits yields in the production, and have the viscosity height, bonding force is strong, and is easy to use; Time of drying is short, nontoxic, inexpensive, excellent storage stability.
The present invention has removed the formaldehyde in the sizing agent fully, thereby reaches absolute environmental protection, and it is 0 that this product makes the formaldehyde content in the sizing agent, has surpassed GB/T14732-2006<Timber industry sizing agent urea aldehyde, phenolic aldehyde, San Juqinganjiaquanshuzhi>National standard
4. the present invention prepare omnidistance dehydration and only use 4-5 hour, and preparation time is short, and efficient is high, safety, environmental protection.
Embodiment:
Embodiment 1:
a kind of urea-formaldehyde resin adhesive of removing formaldehyde; Its composition comprises: formaldehyde, urea, formic acid, sodium hydroxide, Z 150PH; The parts by weight 400-600 of described formaldehyde, the parts by weight 300-500 of described urea, the parts by weight 0.3-0.6 of described formic acid; The parts by weight 0.3-0.6 of described sodium hydroxide, described Z 150PH 4-6.
Embodiment 2:
embodiment 1 described urea-formaldehyde resin adhesive of removing formaldehyde; The parts by weight 550 of described formaldehyde, the parts by weight 400 of described urea, the parts by weight 0.5 of described formic acid; The parts by weight 0.5 of described sodium hydroxide, described Z 150PH 5.
Embodiment 3:
The preparation method of
a kind of urea-formaldehyde resin adhesive; At first prepare urea-formaldehyde resin adhesive, the urea-formaldehyde resin adhesive insulation is dewatered when 70 spend for the first time, dehydrating amount is between the 5-25%; Deviating from the back mends in the urea-formaldehyde resin adhesive when 40-80 spends with equivalent zero(ppm) water; Carry out above-mentioned remove-subsidy water process repeatedly, make the formaldehyde full scale clearance in the urea-formaldehyde resin adhesive, making the formaldehyde content in the urea-formaldehyde resin adhesive is 0.Process the urea-formaldehyde resin adhesive that does not contain formaldehyde.
The parts by weight of above-mentioned formaldehyde are at first got in
; Get the 45-55% of above-mentioned weight of urea umber and the parts by weight thorough mixing of above-mentioned sodium hydroxide then; Formaldehyde, urea and aqueous sodium hydroxide solution are heated to 90 degree insulations, and 1/3rd of secondary input residue urea parts by weight in insulation then; The adjustment pH value is 4.3---between 4.7; Be reacted into glue through high-temperature polycondensation and adjust pH value 7.5 afterwards---between 8.5; After dropping into 1/3rds minutes of urea residue urea parts by weight for the third time; Drop into 1/3rd of weight of urea umber for the 4th time, insulation is processed urea-formaldehyde resin adhesive to 70.
Embodiment 4:
The preparation method of
embodiment 3 described urea-formaldehyde resin adhesives; The described method for preparing urea-formaldehyde resin adhesive is: the parts by weight 400-600 that gets formaldehyde; Get the 45-55% of weight of urea umber 300-500 then; With above-mentioned sodium hydroxide thorough mixing, formaldehyde, urea and aqueous sodium hydroxide solution are heated to 90 degree insulations, then 1/3rd back insulations of secondary input residue urea parts by weight; The adjustment pH value is between 4.3-4.7; Be reacted into glue through high-temperature polycondensation and adjust pH value between 7.5-8.5 afterwards; Drop into urea for the third time for 1/3rd of residue urea parts by weight, be incubated after 30 minutes, 1/3rd of the 4th input urea residuals weight umber; Insulation to 70 degree is processed urea-formaldehyde resin adhesive.
Embodiment 5:
a kind of preparation method who removes the urea-formaldehyde resin adhesive of formaldehyde; When 70 spend, dewater the urea-formaldehyde resin insulation that obtains for the first time; Dehydrating amount is between the 5-25%; Deviate from the back and when 40-80 spends, mend in the urea-formaldehyde resin adhesive with equivalent zero(ppm) water, carry out above-mentioned dehydration repeatedly and make the formaldehyde full scale clearance in the urea-formaldehyde resin adhesive, making the formaldehyde content in the urea-formaldehyde resin adhesive is 0.
Embodiment 6:
The described preparation method who removes the urea-formaldehyde resin adhesive of formaldehyde of
the foregoing description; The production technique that sizing agent is carried out moisturizing that adopts that our company develops voluntarily; Operational path is the water that contains formaldehyde in the sizing agent to be taken off after earlier polycondensations such as formaldehyde, urea being become sizing agent again, replenishes the zero(ppm) water that does not contain formaldehyde simultaneously, carries out above-mentioned work repeatedly and accomplishes aldehyde (domestic like product is that of no help water law sizing agent is not because of there being the moisturizing technology of grasp to sizing agent; During moisturizing or make sizing agent lose viscosity or sizing agent to solidify; So can not moisturizing, can only limitedly dewater, just the formaldehyde in the sizing agent is difficult to purify.）。
Claims (4)
1. urea-formaldehyde resin adhesive; Its composition comprises: urea, formic acid, sodium hydroxide, Z 150PH; It is characterized in that: the parts by weight 300-500 of described urea; The parts by weight 0.3-0.6 of described formic acid, the parts by weight 0.3-0.6 of described sodium hydroxide, described Z 150PH umber 4-6.
2. urea-formaldehyde resin adhesive according to claim 1 is characterized in that: the parts by weight 400 of described urea, the parts by weight 0.5 of described formic acid, the parts by weight 0.5 of described sodium hydroxide, described Z 150PH umber 5.
3. the preparation method of a urea-formaldehyde resin adhesive at first prepares urea-formaldehyde resin adhesive, it is characterized in that: the urea-formaldehyde resin adhesive insulation is dewatered when 70 spend for the first time; Dehydrating amount is between the 5-25%; Deviate from the back and when 40-80 spends, mend in the urea-formaldehyde resin adhesive, carry out above-mentioned remove-subsidy water process repeatedly, make the formaldehyde full scale clearance in the urea-formaldehyde resin adhesive with equivalent zero(ppm) water; Making the formaldehyde content in the urea-formaldehyde resin adhesive is 0, processes the urea-formaldehyde resin adhesive that does not contain formaldehyde.
4. the preparation method of urea-formaldehyde resin adhesive according to claim 3; It is characterized in that: the described method for preparing urea-formaldehyde resin adhesive is: the parts by weight 400-600 that gets formaldehyde; Get the 45-55% of weight of urea umber 300-500 then; With above-mentioned sodium hydroxide thorough mixing, formaldehyde, urea and aqueous sodium hydroxide solution are heated to 90 degree insulations, then 1/3rd back insulations of secondary input residue urea parts by weight; The adjustment pH value is between 4.3-4.7; Be reacted into glue through high-temperature polycondensation and adjust pH value between 7.5-8.5 afterwards; Drop into urea for the third time and be 1/3rd of residue urea parts by weight; Be incubated after 30 minutes, 1/3rd of the 4th input urea residuals weight umber, insulation to 70 degree are processed urea-formaldehyde resin adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103736865A CN102417802A (en) | 2011-11-22 | 2011-11-22 | Urea-formaldehyde resin adhesive and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103736865A CN102417802A (en) | 2011-11-22 | 2011-11-22 | Urea-formaldehyde resin adhesive and preparation method thereof |
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| CN102417802A true CN102417802A (en) | 2012-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011103736865A Pending CN102417802A (en) | 2011-11-22 | 2011-11-22 | Urea-formaldehyde resin adhesive and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137603A (en) * | 2018-08-27 | 2019-01-04 | 常州大学 | A kind of Lauxite gum stabilizing agents and its application method |
-
2011
- 2011-11-22 CN CN2011103736865A patent/CN102417802A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137603A (en) * | 2018-08-27 | 2019-01-04 | 常州大学 | A kind of Lauxite gum stabilizing agents and its application method |
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Application publication date: 20120418 |