polyformaldehyde

1. Physical and chemical constants of the substance: National standard code 41533; CAS number of polyformaldehyde is 30525-89-4. Chinese name: Polyformaldehyde; English name: Paraformaldehyde； Polyoxymethylene 　　Alternative name: Polyformaldehyde ； Polyformaldehyde ； diformaldehyde ； Solid formaldehyde ； Polyformaldehyde Molecular formula: (CH2O)n Appearance and properties: Low-molecular-weight forms are white crystalline powders with a formaldehyde odor. Molecular weight: (30)n Vapor pressure: 0.19 kPa at 25°C Flash point: 70°C Melting point: 120–170°C Solubility: Insoluble in ethanol, slightly soluble in cold water, soluble in dilute acids and bases Density: Relative density (water=1): 1.39 ； Relative density (air=1): 1.03. Stability: Stable. Hazard symbol: 8 (Flammable solid). Main uses: It is primarily used in the production of various synthetic resins and adhesives, as well as in the manufacture of fumigants, disinfectants, and pesticides. Impact on the environment: I. Health hazards: Routes of exposure: Inhalation, ingestion, and dermal absorption. 　　Health hazards: This product is highly irritating to the respiratory tract, causing rhinitis, pharyngitis, pneumonia, and pulmonary edema. It has an allergenic effect on the respiratory tract. Direct eye contact can cause burns. It is irritating to the skin and causes redness and swelling. Oral use causes strong skin irritation; repeated long-term exposure leads to dryness, cracking, and scaling. 　　II. Toxicological data and environmental behavior Acute toxicity: LD50 = 1600 mg/kg (oral, in rats) Hazardous characteristics: It poses a risk of combustion when exposed to open flames, high temperatures, or oxidizing agents. Upon heating, it decomposes to release flammable gases that can form explosive mixtures with air. Powders and air can form an explosive mixture; when a certain concentration is reached, an explosion will occur upon contact with a spark. 　　Combustion (decomposition) products: carbon monoxide, carbon dioxide. 3 Laboratory monitoring methods: Gas chromatography method. 4 Environmental standards: Former Soviet Union workshop hygiene standard – 5 mg/m3. 5 Emergency response measures: I. Emergency response to leaks: Isolate the area affected by the leak, place warning signs around it, and eliminate any sources of fire. It is recommended that emergency responders wear gas masks and standard fire protection clothing. Collect using non-sparking tools in a dry, clean, covered container, and transport it to a waste disposal site. In the event of a large spill, wet it with water and then collect and recycle it. 　　 II. Protective Measures Respiratory protection: Wear a dust mask. Wear a gas mask if necessary. 　　Eye protection: Wear safety goggles. 　　Protective clothing: Wear appropriate protective clothing. 　　Hand protection: Wear protective gloves. 　　Others: Smoking, eating, and drinking are prohibited at the work site. After work, take a shower and change clothes. Pay attention to personal hygiene. 　　 III. First aid measures Skin contact: Remove contaminated clothing and thoroughly wash the affected area with soapy water and clean water. 　　Eye contact: Immediately lift the eyelids and rinse with flowing water or saline for at least 15 minutes. Seek medical attention. 　　Inhalation: Quickly move to a place with fresh air. Keep the airways unobstructed. Oxygen is administered when there is difficulty breathing. When breathing stops, perform artificial respiration immediately. Seek medical attention. 　　Ingestion: If swallowed accidentally, give the affected person plenty of warm water to drink to induce vomiting and seek medical attention. 　　Fire extinguishing methods: fog water, foam, carbon dioxide, dry powder, sand. 　　 IV. Uses: Polyformaldehyde is primarily used in the production and use of herbicides. It is also employed in the manufacture of synthetic resins (such as artificial horn products or artificial ivory) and adhesives. Polyformaldehyde is used in the pharmaceutical industry (as an active ingredient in contraceptive creams), as well as for disinfecting pharmacies, clothing, and bedding. It can also be used as a fumigant, bactericide, and insecticide. Uses of polyformaldehyde: Low-polymerization-degree polyformaldehyde can replace conventional industrial formalin solutions in the production of a wide range of formalin-based products such as pesticides, synthetic resins, coatings, and fumigants for disinfection. It helps to reduce energy consumption associated with dehydration processes as well as the amount of wastewater that needs to be treated; it is thus an environmentally friendly solution that benefits both the country and its citizens. Low-polymerization-degree paraformaldehyde, with a higher active content compared to industrial formaldehyde and in the form of solid particles, is suitable for use in chemical synthesis in industries such as chemicals and pharmaceuticals, as well as in other industrial fields. It has a wide range of applications, especially in syntheses that require anhydrous formaldehyde as a raw material. It can also be used as a disinfectant, bactericide, fumigant, and herbicide, as well as in the production of resins and artificial ivory. 　　 -Industry – used in industries such as synthetic resins, adhesives, and coatings. 　　 – Used in the production of herbicides: glyphosate, acetochlor, butachlor, atrazine, clopyralid, etc. 　　 Polyoxymethylene – Pesticides – used in the production of insecticides: deltamethrin, methamidophos, etc. 　　 – Used in the production of insecticides: triadimefon, triazolone, procymidone, azoxystrobin, etc. 　　 – Used as plant growth regulators: glycine betaine. 　　 Medicine – used for disinfecting hospital rooms, clothing, and bedding