poly((phenyl isocyanate)-co-formaldehyde)
poly((phenyl isocyanate)-co-formaldehyde)
CAS: 9016-87-9
Molecular Formula: C8H7NO2
poly((phenyl isocyanate)-co-formaldehyde) - Names and Identifiers
poly((phenyl isocyanate)-co-formaldehyde) - Physico-chemical Properties
| Molecular Formula | C8H7NO2 |
| Molar Mass | 149.14668 |
| Density | 1.2g/mLat 25°C(lit.) |
| Boling Point | 392°C5mm Hg |
| Flash Point | >230°F |
| Solubility | DMSO (Sparingly), Ethyl Acetate (Slightly), Methanol (Soluble) |
| Vapor Density | 8.6 (vs air) |
| Appearance | Oil |
| Color | Yellow to Orange |
| Storage Condition | Refrigerator, Under inert atmosphere |
| Stability | Stable. Incompatible with strong oxidizing agents, alcohols. May decompose in moist air, or on contact with water. |
| Refractive Index | n20/D 1.634 |
| Physical and Chemical Properties | Brown transparent liquid with pungent odor. |
| Use | Used in the manufacture of foam plastics, adhesives, etc |
poly((phenyl isocyanate)-co-formaldehyde) - Risk and Safety
| Risk Codes | R20 - Harmful by inhalation R36/37/38 - Irritating to eyes, respiratory system and skin. R42 - May cause sensitization by inhalation R42/43 - May cause sensitization by inhalation and skin contact. R26 - Very Toxic by inhalation R22 - Harmful if swallowed R39/23/24/25 - R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R11 - Highly Flammable R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S28 - After contact with skin, wash immediately with plenty of soap-suds. S38 - In case of insufficient ventilation, wear suitable respiratory equipment. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37 - Wear suitable protective clothing and gloves. S23 - Do not breathe vapour. S16 - Keep away from sources of ignition. S7 - Keep container tightly closed. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
| RTECS | TR0350000 |
poly((phenyl isocyanate)-co-formaldehyde) - Nature
Open Data Verified Data
Brown transparent liquid with pungent odor. Density 1.2g/cm3. Ignition point 2 1 8 ℃. It is a mixture of polyisocyanates with different functional groups. Usually, diisocyanate accounts for 50% of the total amount of the mixture, and the rest are oligomeric isocyanates with more than three functional groups.
Last Update：2024-01-02 23:10:35
poly((phenyl isocyanate)-co-formaldehyde) - Preparation Method
Open Data Verified Data
PAPI (crude MDI) was produced in the same manner as MDI except that the ratio of the amounts of aniline and hydrochloric acid was smaller. The synthesis of PAPI, like MDI, was carried out in two steps. First from aniline and formaldehyde solution (formalin) in the role of Lewis acid, condensation synthesis containing a certain amount of diamine polyamine mixture, and then this kind of polyamine compounds by phosgenation reaction to get PAPI. In the synthesis of polyamine compounds, the content of diamine should be controlled at about 50%. In general, it can be achieved by adjusting the ratio of the amount of aniline and formaldehyde to the two raw materials, that is, the amount of the substance. It is determined that about 50% diamines exist in the synthesized polyamine compound when the molar ratio of aniline to formaldehyde is 1:75. Therefore, the raw material component ratio relationship, generally make the ratio of the amount of aniline and formaldehyde in the range of 1.6~2.O change, polyamine synthesis of other operating conditions similar to MDA operating conditions. For the production process of MDI and PAPI, the required polyamine must be a polyamine compound containing 60% ~ 75% diamine, the key is also achieved by changing the ratio of the amount of aniline and formaldehyde feed material. In the case where the ratio of the amount of aniline/formaldehyde substance is 1.4/2, the synthesized polyamine contains about 75% of the diamine compound. Typically, a process of co-production of MDI with PAPI is employed.
Last Update：2022-01-01 10:55:10
poly((phenyl isocyanate)-co-formaldehyde) - Use
Open Data Verified Data
mainly used for the preparation of rigid polyurethane foam, semi-rigid polyurethane foam, adhesives and other raw materials, also used in the casting industry, such as self-hardening sand resin.
Last Update：2022-01-01 10:55:09
poly((phenyl isocyanate)-co-formaldehyde) - Safety
Open Data Verified Data
PAPI is very volatile and less toxic in respiratory inhalation and skin absorption, but it contains isocyanate groups (NCO) groups that are easy to react with moisture, when the material temperature is heated to more than 40 ℃ (such as melting) or the working environment is poorly ventilated, it will increase the vapor toxicity, in addition to the use of spraying process construction work place, it can lead to an increase in the concentration of suspended particles in the air and cause toxicity. Work in a similar environment should wear a gas mask and respirator, otherwise, repeated inhalation of excessive concentrations of steam will cause respiratory allergies. As soon as you get it on the skin or inside the eye, rinse with water and wash the skin with soap and water. Galvanized iron drum packaging, the product is non-volatile, can be transported according to the relevant provisions of the general chemicals. Due to the active chemical nature of PAPI, it is easy to react with water to generate insoluble urea compounds and release carbon dioxide, causing the drum barrel and increasing the viscosity. Therefore, during the storage process, the container must be strictly dry sealed and filled with dry nitrogen protection. PA-PI should be at room temperature (20~25 deg C) in a well-ventilated room strictly sealed preservation; If the storage temperature is too low (below 5 deg C) can lead to the formation of crystallization phenomenon, so must pay attention to antifreeze. Once crystallization occurs, it should be heated and melted at 70-80 °c before use, and stirred well. Should avoid long-term storage above 50 ℃, In order to avoid the formation of insoluble solids and increase the viscosity. The shelf life of PAPI is 1 year under suitable storage conditions.
Last Update：2022-01-01 11:08:46
poly((phenyl isocyanate)-co-formaldehyde) - Reference Information
| (IARC) carcinogen classification | 3 (Vol. 19, Sup 7) 1987 |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | used in the manufacture of foam plastics, adhesives, etc. used in the manufacture of polyurethane materials, widely used in the construction industry, automotive industry, electrical industry, such as thermal insulation materials or bedding. |
| production method | aniline and formaldehyde were mixed in a molar ratio of 1.6-2.0:1, then, hydrochloric acid is added as a condensation catalyst, which is added to the condensate and reacted at 90-110 ℃ for 30-60min to obtain a certain proportion of diphenylmethane-4, 4 '-diamine and polymethylpolyphenylmethylamine, PAPI and MDI can be obtained by phosgenation, separation and purification. Raw material consumption quota: formaldehyde (100%)150kg/t, aniline 750kg/t, phosgene 850kg/t. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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