Toluene diisocyanate TDI gas alarm for plastic factory High precision factory direct selling

  Toluene diisocyanate TDI gas alarm Ska-ne301-tdi Chinese Name: toluene-2,4-diisocyanate
English Name: toluene-2,4-diisocyanate; 2,4-tolylene diisocyanate。 Alias: toluene 2,4-diisocyanate; 2，4-TDI。 Molecular formula: c9h6n2o2; CH3C6H3 （NCO） 2。 Packing method: 500ml textured glass bottle, iron capped crimped glass bottle, plastic bottle or ordinary wooden box outside metal barrel (can)
Main uses: used in organic synthesis, production of foamed plastics, coatings and as chemical reagents
Alias toluene diisocyanate, toluene 2,4-diisocyanate (toluene-2,4-diisocyanate), methylphenylene, 2,4-diisocyanate, 4-methyl-1,3-phenylene diisocyanate, 2,4-diisocyanatoluene 4-methyl-m-phenylene diisocyanate physical and chemical properties edit physical and chemical properties main components: pure product
Appearance and properties: colorless to light yellow transparent liquid
Melting point (℃): 13
2
Boiling point (℃): 118 (1
33kpa)
Relative density (water = 1): 1
22
Relative vapor density (air = 1): 6
0
Vapor pressure (kPa): 1
33 (118 ℃)
Flash point (℃) (open flash point): 121
Heat of combustion (kJ / mol): stability and reactivity: stable
Hazard characteristics: flammable in case of open fire and high heat
It can react with oxidant
It reacts violently with amines, alcohols, alkalis and warm water and can cause combustion or explosion
It can decompose into toxic gases when heated or burned
Its vapor is heavier than air and can diffuse to a considerable distance at a lower place
It will catch fire and burn back in case of fire source
In case of high heat, the internal pressure of the container increases, and there is a risk of cracking and explosion
Solubility: soluble in acetone and ether
Production method: nitration of toluene to dinitrotoluene, and then reduction to toluene diamine
TDI (mainly 2,4-isomer) is obtained by the reaction of toluene diamine with phosgene
Properties: colorless liquid
It has a pungent smell
The color darkens in the sun
Sodium hydroxide or tertiary amine can cause polymerization
React with water to produce carbon dioxide
It can be miscible with ethanol (decomposition), ether, acetone, carbon tetrachloride, benzene, chlorobenzene, kerosene, olive oil and diethylene glycol methyl ether
Toxic
There is a possibility of cancer
Irritating
Relative density (4 ℃): 1
2244; Freezing point tdi-65, 3
5 ~ 5
5 ℃; TDI-80，11
5~13
5℃ ; TDI-100，19
5~21
5℃ ; Vapor pressure (20 ℃), 0
01mmhg; Flash point (open cup), 132 ℃; Boiling point 251 ℃, evaporation heat (120 ~ 180 ℃), 337
04 kJ / kg (kcal / kg) (80
5); Refractive index (20 ℃) 1
569, harmful limit ppm 0
1; Store in a cool, dry and dark place filled with argon or nitrogen
Purpose: to prepare polyurethane and macrocyclic crown ether compounds
Protein covalent crosslinker
The antibody was fixed on the plastic surface for radioimmunoassay
Hazardous nature class 6
1 poison
Hazard code 61111 UN No
2078 other relevant editors industrial use TDI (toluene diisocyanate) is a commonly used polyisocyanate, which is polyurethane (PU) material and important basic raw material
TDI commonly used in polyurethane industry is a mixture of 2,4-TDI and 2,6-TDI isomers, including three commonly used brands: tdi-80 / 20, tdi-100 and tdi-65 / 35
The preceding number indicates the content of 2,4-TDI in the composition
For example, 80 in tdi-80 / 20 indicates that its composition is 80% 2,4-TDI and 20% 2,6-TDI; 100 in tdi-100 indicates that it is basically 2,4-TDI (about 98%), and there are few isomers of 2,6-TDI
It is mainly used to produce soft polyurethane foam, polyurethane elastomer, coating, adhesive, etc
Main hazard TDI mainly exists in paint during decoration
Free TDI exceeding the standard will cause harm to human body, mainly due to sensitization and irritation, and symptoms such as eye pain, tears, conjunctival congestion, cough, chest tightness, shortness of breath, asthma, red papule, maculopapular, contact allergy, etc
The international limit standard for free TDI is less than 0
5%
Toluene diisocyanate is a colorless or light yellow transparent liquid with pungent odor, which turns yellow under ultraviolet irradiation; Easy to polymerize when heated in alloy steel container; It can react with hydroxyl, water, amine and compounds with active hydrogen in hydroxyl compounds to produce carbamate, urea, carbamide and biuret
Use management editor puworld (2007 / 06 / 14) - TDI is a colorless liquid with pungent and pungent smell
The boiling point is 247 ℃ and the pour point is 12
5-14
5 ℃
It is stable at room temperature and will polymerize at 50 ℃
In addition, TDI is insoluble in water but can react quickly with water
Therefore, when storing TDI, pay attention to the low-temperature drying of container and environment
TDI is easy to react with alkali, amine and polyol, which is also a factor to be considered in the storage and transportation of TDI
High temperature will accelerate the reaction, which will release heat and carbon dioxide, with the risk of scald and pressure
Effects of TDI on human body and first aid measures high concentration of TDI vapor will stimulate eyes, and after inhalation, it will seriously stimulate nose and throat, which may cause chest tightness, and then cause asthma and even bronchospasm
Liquid TDI can also cause serious irritation to the skin and eyes
It has low toxicity and can stimulate the intestines and stomach
So if someone accidentally touches or swallows TDI, what first aid measures should we take? For skin polluters, wash them with soap and water immediately; For patients with eye pollution, wash their eyes with clean water immediately for at least 15 minutes
If wearing * glasses, remove them and seek medical advice; For patients who ingest TDI, their symptoms generally appear after several hours of ingestion
Do not induce vomiting
Let the patient rest and seek medical advice
At present, there is no specific antidote for TDI poisoning
It is generally treated as preliminary stimulation or bronchospasm
Artificial respiration should be done in time when necessary
About the management of TDI products, the management of TDI products mainly includes the following important steps: issuing MSDS, correct label, emergency response ability, pre supply and marketing audit, audit method and qualification, compliance with laws and regulations, etc
The main purposes of issuing safety data sheet (MSDS) are as follows: according to the requirements of laws and regulations, provide users with information on the dangers of products, help users establish a safe workplace, protect the environment, correctly label products, provide promotion materials, and prepare a set of comprehensive and easy to understand technical instructions for all kinds of readers
For * must have labels: * there must be safety labels on barrels and transport labels on transport vehicles
For countries that have not formulated * transport regulations, it is recommended to adopt international standards
For * use danger warning (R) to indicate the danger of the product, and use safety warning (s) to provide safe handling and emergency suggestions
In addition, precautions should be taken during the disposal and storage of TDI to ensure the safe disposal, handling and storage of products (barrels), and compatible / incompatible packaging materials
For special cases of TDI, protective clothing should be worn first
In addition, we can take the following cases as examples: when the barrel expands due to the release of carbon dioxide after being polluted by water, first return the barrel to the supplier, and then pierce the barrel top with a long cone or iron hook
Pay attention to placing the damaged barrel in a special management area and pay attention to exhaust ventilation
When pouring water into the bucket, first check whether the bucket has leakage
If there is no leakage, cover the bucket again and wipe it dry; In case of leakage, seal the barrel underwater or send it to land before sealing
In this process, pay close attention to the pressure rise of any barrel caused by water pollution
When the barrel overturns and bursts, dry sand or chemical absorbent shall be paved in the polluted area (large area), and the damaged barrel shall be put into the (over) barrel
The used sand or chemical absorbent shall be collected in the open barrel for proper treatment, and the gas shall be discharged through the exhaust cover of the (over) barrel
In addition, the contaminated area shall be thoroughly cleaned with diisocyanate neutralizing solution
The commonly used neutralizing liquid mainly includes wet sand and wet soil, giving priority to non combustible slow reaction liquid, combustible fast reaction liquid (only applicable to TDI), neutralizing (hand washing) soap (if there is no neutralizing soap, it can be replaced by hot soapy water), etc
Emergency disposal editor skin contact: take off contaminated clothes and rinse with a large amount of flowing water
Eye contact: lift the eyelids immediately and rinse thoroughly with a large amount of flowing water or normal saline for at least 15 minutes
See a doctor
Inhalation: quickly leave the site to a place with fresh air
Keep the respiratory tract unobstructed
If breathing is difficult, give oxygen
If breathing stops, perform artificial respiration immediately
See a doctor
Ingestion: rinse your mouth with water and drink milk or egg white
See a doctor
Respiratory protection: when the concentration in the air exceeds the standard, you must wear a self-priming filter gas mask (half mask)
In case of emergency rescue or evacuation, air respirators should be worn
Eye protection: wear chemical safety glasses
Body protection: wear anti poison penetration work clothes
Hand protection: wear rubber oil resistant gloves
Other protection: smoking, eating and drinking are prohibited at the work site
Clean thoroughly after work
Store clothes contaminated by poisons separately and use them for standby after washing
Keep good hygiene habits
Emergency treatment of leakage: quickly evacuate the personnel in the leakage contaminated area to the safe area, isolate and strictly restrict access
Cut off the fire source
It is recommended that emergency treatment personnel wear self-contained positive pressure respirator and anti-virus clothing
Cut off the source of leakage as much as possible
Prevent from flowing into restricted spaces such as sewers and flood drainage ditches
Small leakage: absorb with sand, vermiculite or other inert materials
Massive leakage: build a dike or dig a pit for reception
Transfer to tank car or special collector by pump, recycle or transport to waste treatment site for disposal
Harmful combustion products: carbon monoxide, carbon dioxide, nitrogen oxide, hydrogen cyanide
Fire extinguishing method: Firefighters must wear gas masks and full body fire fighting clothes to extinguish the fire in the upwind direction
Move the container from the fire site to an open place as far as possible
Spray water to keep the containers in the fire site cool until the fire extinguishing is completed
If the container in the fire site has changed color or generated sound from the safety pressure relief device, it must be evacuated immediately
Fire extinguishing agent: dry powder, carbon dioxide, sand
It is forbidden to use water, foam and acid-base extinguishing agents to extinguish the fire
Waste disposal and barrel cleaning TDI and barrel shall be disposed in strict accordance with national, provincial and local regulations
It can react with polyols to produce foam, and then be discarded or incinerated
Or react with liquid detergent to form urea derivatives
For the barrel containing TDI, first inject 2-5 liters of decontamination solution into the barrel, clean it by spraying or rolling, then open the barrel for 4-6 hours to fully react, and finally rinse it with water