aerolite300
Urea formaldehyde
CAS: 9011-05-6
Molecular Formula: C2H6N2O2
aerolite300 - Names and Identifiers
| Name | Urea formaldehyde |
| Synonyms | basf anaflex amikol65 agroform aerolite300 aeroliteffd aerolitea300 acrisinfs017 Urea formaldehyde urea formal de lyde resin UF |
| CAS | 9011-05-6 |
| EINECS | 618-464-3 |
| InChI | InChI=1/CH4N2O.CH2O/c2-1(3)4;1-2/h(H4,2,3,4);1H2 |
aerolite300 - Physico-chemical Properties
| Molecular Formula | C2H6N2O2 |
| Molar Mass | 90.08 |
| Density | 1.200 g/cm3 |
| Storage Condition | -20°C |
| Physical and Chemical Properties | Colorless to light-colored liquid or white solid, tasteless, high hardness, oil resistance, mildew resistance, good light resistance. |
| Use | Used in the manufacture of fiber board, foam board and bamboo wood adhesive, also used in fabric and paper treatment agent; Used for making caps and buttons and other daily necessities; Used in wood, plywood, furniture manufacturing, adhesives for the repair of agricultural machinery and other bamboo-wood materials |
aerolite300 - Risk and Safety
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| Toxicity | LD50 oral in rat: 8394mg/kg |
aerolite300 - Nature
Open Data Verified Data
This product is partially alkoxylated amino resin, colorless or light yellow liquid, and water, alcohols, esters, ketones and ether alcohols completely miscible.
Last Update：2024-01-02 23:10:35
aerolite300 - Preparation Method
Open Data Verified Data
urea (urea) and formaldehyde (37% aqueous solution) according to the ratio of the amount of a certain substance in acidic or basic medium in the heat condensation polymerization obtained.
Last Update：2022-01-01 11:09:22
aerolite300 - Use
Open Data Verified Data
urea-formaldehyde resin is mainly used in the manufacture of molding powder, followed by laminated plastics, and can also be used for adhesives and coatings.
Last Update：2022-01-01 11:09:23
aerolite300 - Safety
Open Data Verified Data
This product has low toxicity, and has a stimulating effect on the skin and respiratory tract. The production equipment should be sealed. Plastic drum or iron drum packaging, plastic drum per barrel 50kg, iron drum per barrel 200kg. Sun protection, high temperature protection. The storage period was 3 months.
Last Update：2022-01-01 11:09:23
aerolite300 - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| thermosetting resin | urea-formaldehyde resin, also known as urea-formaldehyde resin, is a colorless, odorless, non-toxic, transparent thermosetting resin, it can be dissolved in water before changing, easy to cure, release low molecular weight substances during curing, excellent light resistance, no discoloration after long-term use, no discoloration during thermal curing and resistance to mineral oil. By urea H2NNH2 and formaldehyde according to a certain ratio plus a small amount of positive ion modifier (tetraethylenepentamine), glycerin and curing agent (hexamethylenetetramine) reaction under the condition of weak acid, the low molecular weight is a colorless transparent to light white liquid soluble in water; The high molecular weight is a white solid. The specific gravity is 1.48~1.52, the heat distortion temperature is 128~138 ℃, and the pyrolysis begins at 176 ℃, and formaldehyde is released. When heated to more than 200 deg C, the escape of CO,CO2,NH3 and cyanide and other pyrolysis products. It can be cured with a suitable catalyst and the product is a solid which is odorless and has good light resistance. Water resistance, aging resistance and mechanical strength slightly inferior to phenolic resin. The compression molding powder can be prepared by adding fillers and the like to the uncured slurry, which is famous for the good coloring property and the production of colorful daily necessities. Mainly used in plastics, coatings, adhesives, daily necessities, fabrics and paper treatment agents. FIG. 1 shows the molecular structure of urea-formaldehyde resin. urea-formaldehyde resins are produced by different methods depending on their use. Urea and formaldehyde in the molar ratio of 1:1.5~1.6 ingredients, under the catalysis of oxalic acid, the resin for molding powder is formed in a weak acidic aqueous solution, which is mixed with fillers, pigments and other additives, dried, pulverized, ground and granulated, urea-formaldehyde molding powder (or compression molding powder) is obtained. Cheap and colorful, oil-resistant, not affected by weak alkali and organic solvents. It is mainly used for the manufacture of daily necessities and industrial products with low requirements on water resistance and electrical performance. A low-molecular-weight urea-formaldehyde resin solution can be produced in a weakly acidic aqueous solution at a molar ratio of urea to formaldehyde of 1:1.8 to 2.5. Can be used for the manufacture of adhesives, is the largest amount of adhesive varieties, widely used in wood processing industry, can also be used to impregnate paper, modified can also be impregnated fabric. Urea-formaldehyde resin modified with butanol can be used to improve the hardness and water resistance of alkyd resin coatings. In addition, the use of air as a foam of highly cross-linked urea formaldehyde plastic, can be sound insulation, heat insulation and very flame resistant, commonly used as a building material such as heat insulation board. In order to improve the water resistance of urea-formaldehyde resin, melamine is commonly used for modification by copolycondensation. |
| synthesis principle of urea-formaldehyde resin | urea and formaldehyde are both reactive substances, urea is an anionic reactive body, formaldehyde is a cationic reactant. The reaction between urea and formaldehyde is divided into two stages: the first stage is in the neutral or weak alkaline medium, the first addition (hydroxymethylation) reaction, to produce a hydroxyl group, two hydroxyl group and three hydroxymethyl group. The second stage is dehydration condensation between methylol compounds in an acidic medium to produce a water-soluble resin, and the resinous product is converted into a body type resin by heating or in the presence of an acidic curing agent. (1) addition reaction 1.1 in neutral or weak alkaline medium, urea and formaldehyde are first subjected to addition (hydroxymethylation) reaction to generate an initial intermediate, one hydroxyl, and then dihydroxyl, these methylol derivatives are monomers that constitute future polycondensation products. 1.2 1 mole of urea reacts with less than 1 mole of formaldehyde to produce monoxymethylurea; 1 mole of urea reacts with more than 1 mole of formaldehyde to produce dioxymethylurea; when formaldehyde is excessive, trimethylol urea and tetra-methylol urea can be further formed. (2) Polycondensation reaction The polycondensation reaction (or resinification reaction) in the synthesis of urea-formaldehyde resin is a reaction in which a hydroxymethyl compound forms a macromolecule. It can be carried out under acidic or basic conditions, but under basic conditions, the polycondensation reaction rate is very slow, and the industry is carried out under weak acidic conditions. The hydrate of 2.1 formaldehyde, methyl glycol, in the presence of hydrogen ions, generates the hydroxymethyl cation-CH2OH, which coordinates with the non-shared electron pair of nitrogen in urea, and then disengages H, production of monomethylurea. When 2.2 hydroxymethylurea is dehydrated to give methylene urea, and methylene urea is combined with urea to give methylene diurea, the following condensation reaction is carried out. The NH2 group of 2.3 Urea is hydroxymethylated or methyleneylated, The NH2 group is changed to NH group, and the NH group is also reacted with CH2OH Group, in this way, not only does the linear chain molecule branch to form a polymer until a network structure is formed, but a methylene ether bond is generated between a hydroxymethyl group and a hydroxymethyl group, and formaldehyde is removed by heating to generate a methylene group. The first reaction is the most likely of the above three reactions. With the progression of the resin reaction, the molecules gradually increased, and the viscosity also increased with the increase of the degree of polycondensation. The molecular weight is generally about 700, and the molecule contains active hydroxymethyl and hydrogen ions, which are linear structures. In addition, at an appropriate pH and temperature, the cured product also has a hydrophilic free hydroxymethyl group, which is the reason for the poor water resistance of the urea-formaldehyde resin. |
| toxicity | The resin is low-drug or drug-free. Mainly pyrolysis products such as formaldehyde, can stimulate the respiratory tract and skin, should be paid attention. The free formic acid contained in the urea-formaldehyde resin is toxic, and the lower the free formaldehyde content in the resin, the smaller the toxicity. |
| wet strength agent | urea-formaldehyde resin is a kind of wet strength agent commonly used in the paper industry, due to the popularization and use of polyamide epoxy resin wet strength agent, the dosage has been gradually reduced. Due to low prices, there are still many enterprises continue to use. It is used as an anti-wrinkle and anti-shrinkage finishing agent for cotton fabrics in textile industry, and can increase the color fastness of fabrics. Urea-formaldehyde resins used in other industries are quite different from the varieties described here. The urea-formaldehyde resin may be added to the paper stock or used for surface sizing of the paper. (1) Urea-formaldehyde resin is added to the paper stock as a wet strength agent, the liquid urea-formaldehyde resin can be directly added to the beater, or added to the paper stock preparation system or the equipment of the paper making system, for example, the mixing box, axial flow pump, screening machine, net box, etc. The amount of urea-formaldehyde resin as a wet strength agent is 0.4 to 4.0% of the weight of the absolute dry fiber, and the concentration is about 5 to 10% when added. (2) Urea-formaldehyde resin as surface sizing agent surface sizing of paper with urea-formaldehyde resin is generally performed in a horizontal roll type device or a sizing tank. The amount of the resin is about 1.5 to 2.0% of the weight of the paper, and the concentration of the resin liquid during sizing is about 1 to 5%. Some paper mills mix urea-formaldehyde resin with oxidized starch, for example, surface sizing was carried out using a mixed glue of 75% oxidized starch and 25% urea-formaldehyde resin in the production of a 80g/m2 basis paper. |
| modified urea-formaldehyde resin | in order to make the urea-formaldehyde resin have a higher retention rate in the pulp, in order to improve the wet strength of the paper, some modifiers can be added during the polymerization of urea-formaldehyde resin, so that the prepared resin has a positive charge. Common modifiers include ethylene polyamine compounds, methylamine, and aminopyridine. The dosage of these modifiers are generally very small, such as 0.05~0.2mol (to 1mol of urea), the amount of urea-formaldehyde resin can be modified, the obtained resin has a similar effect to the melamine formaldehyde resin, and the cost is lower, and the treatment of the damaged paper is easier. 1. The ethylenediamine-modified urea-formaldehyde resin is a cationic type resin, which is cationic type, and therefore has a stronger wetting effect than the unmodified urea-formaldehyde resin. In addition, it also has good water solubility, easy to gel, easy to manufacture and low price. 2, polyamine modified urea-formaldehyde resin is also a cationic resin, because it has two active groups, the effect of humidification is obvious, in addition, it also has the advantages of wide application range of pH value and good stability. If the polyamine-modified urea-formaldehyde resin has a sufficient molecular weight, when it is added to the pulp and cured, the resin forms a network structure, that is, the resin molecules are connected to the pulp fibers vertically and vertically, this results in a significant increase in the wet strength of the paper. 3. Modified sodium sulfite urea-formaldehyde resin: in order to make urea-formaldehyde resin have greater solubility and enhance its wet strength effect, 0.2 to 0.5mol (to 1mol of urea) of NaHSO3 was added so that the polymerization of the resin and the methylene sulfonation were simultaneously carried out to obtain a urea-formaldehyde resin having the following structural formula. The methylene sulfonated urea-formaldehyde and the original urea-formaldehyde resin is the same, is still anionic, the adsorption of the fiber is poor, because the retention rate in the pulp is still not high. FIG. 2 shows the molecular structure of modified sodium sulfite urea-formaldehyde resin. |
| urea-formaldehyde resin adhesive | urea-formaldehyde resin adhesive is urea and formaldehyde in a small amount of catalyst (alkaline catalyst with ammonia, caustic soda, sodium carbonate, sodium phosphate and the like, and an acidic catalyst such as formic acid, oxalic acid, acetic acid and hydrochloric acid) are polycondensed to obtain a viscous initial urea-formaldehyde resin. When used, the curing agent is added to form an insoluble and infusible body cross-linked structure. urea-formaldehyde glue and powder, system by the liquid urea-formaldehyde resin after spray drying after the preparation, storage period is longer, generally can be stored for 1~2 years. compared with phenolic resin adhesive, the advantages and disadvantages of urea-formaldehyde resin adhesive are as follows. 1. The advantages of urea-formaldehyde resin adhesive ① is a colorless and transparent liquid or milky white liquid, and has no pollution to the adhesive objects. ②less toxicity and good light transmittance. (3) low price, easy to use. 2. The shortcomings of urea-formaldehyde adhesive ① the adhesive contains free formaldehyde, and the adhesive layer is easy to age. (2) the water resistance and strength are lower than those of the gum. This information was edited by chemical book Xiaonan (2015-08-06). |
| Use | adhesives for wood, plywood, furniture manufacturing, agricultural machinery repair and other bamboo and wood materials, fabric and paper processing agent, can also be used to plastic civil electrical appliances, caps and buttons and other daily necessities. used in the manufacture of fiber board, foam board and bamboo wood adhesive, also used in fabric and paper treatment agent; Used for making caps and buttons and other daily necessities; Used in wood, plywood, furniture manufacturing, adhesive for repair of agricultural machinery and other bamboo and wood materials production of wood-based panels used in the manufacture of wood, plywood and furniture, adhesive for agricultural machinery repair and other bamboo and wood materials used for production of civil electrical panels and parts used for pressing civil electrical parts, daily parts, mechanical accessories, various buttons, Ware handles, knob, decorative parts, etc. used for making caps and buttons and other daily necessities used for pressing or injecting electrical appliances, instrument housings and civil Electrical Appliance templates, parts, etc. used for manufacturing adhesives used for wood adhesives, reservoirs, drilling plugging agents, textile finishing agents |
| production method | by condensation polymerization of urea (urea) and formaldehyde into a low molecular weight initial product solution, it was then dried under vacuum to a solid. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:01:54
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