Substance Overview for 4,4'-Methylene diphenyl diisocyanate (MDI) (inhalable fraction) see also "polymeric MDI"

2014 ◽  
pp. 1-1
Keyword(s):  
Methylene Diphenyl Diisocyanate

Evaluation of respiratory exposure to 4,4-methylene diphenyl diisocyanate (MDI) vapors in foam injection workers in a household appliance manufacturing company: An Occupational Carcinogen

2019 ◽  
Vol 2 (1) ◽  
pp. 23-27
Author(s):  
Ahmad Nikpey ◽  
Hamzeh Saeidabadi ◽  
Salman Sheikhi ◽  
Saeed Yari ◽  
Tayyebeh Jaddi Madarsara
Keyword(s):  
Ventilation System ◽  
The Body ◽  
Foam Material ◽  
Respiratory Capacity ◽  
Household Appliance ◽  
Administrative Personnel ◽  
Respiratory Exposure ◽  
Methylene Diphenyl Diisocyanate ◽  
Manufacturing Company ◽  
Spss Software

Background: Appliance manufacturing boom is very high hand customers always have a great deal of attention to products that have low energy consumption, therefore the use of isocyanates MDI as a thermal insulation in the body of the refrigerator and is also widely used as a binder in the production of washing machines.  MDI isocyanate study the effects on the respiratory capacity of formers injection was done foam material in a household appliance company Method: this case control study in 1395 and a household appliance manufacturing company in the province of Qazvin 20 personnel working injected foam material is exposed to isocyanates ,for example administrative personnel and 20 served as controls using medical records these values breathing capacity  FVC , FEV1 , FEV1/FVC in  both 1390 and 1394 extracted using SPSS software and paired T-TEST data were analyzed. Results: Measuring the concentration of isocyanate in 90 blocks in the cabin and tap lid above the limit, which was due to the failure of the ventilation system, in 94 years due to the good performance of the ventilation system in the isocyanate concentration was at the limit. According to their experiences foam material is injected every three indexes FVC, FEV1, FEV1/FVC had significant losses, FEV1 and FVC decline among which were a significant level. (p=0.036, p= 0.008) the control samples also non- significant decline in the indicators that this can be attributed to aging. Conclusion: It is known that exposure to isocyanate materials decreased respiratory capacity is personnel, to postpone it to the desired function ventilation system. it would be desirable to postpone the operation of the ventilation system and non-isocyanate leak on the ground, work, be a lot of attention. even with the improvement of the job must be conservative’s injection foam material is exposed to isocyanates be included in the list of hard and hazardous jobs.   Keywords: MDI, respiratory exposure, respiratory capacity, workers inject foam material.

Effects of Loading Percentage of Polyurethane in Lightweight Concrete

2013 ◽  
Vol 357-360 ◽  
pp. 1082-1085 ◽  
Author(s):  
Kamarul Aini Mohd Sari ◽  
Sohif Mat ◽  
Khairiah Haji Badri ◽  
Muhammad Fauzi Mohd Zain
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Lightweight Concrete ◽  
Palm Kernel ◽  
Physical And Mechanical Properties ◽  
Concrete Mixture ◽  
Experimental Program ◽  
Polymer Concrete ◽  
Optimum Level ◽  
Methylene Diphenyl Diisocyanate

An experimental program was performed to obtain the density, compressive strength, and thermal conductivity of palm-based lightweight concrete. Palm-based polyurethane (PU) particles were used as lightweight aggregates in creating concrete systems. Concrete systems contain palm kernel oil-based polyol (PKO-p) reacted with 2,4-methylene diphenyl diisocyanate (MDI). In this study, polymer concrete was improved to achieve the optimum level of PU with the lowest possible density. The PU particles in the concrete mixture comprised of 1% to 5% w/w with density of less than 1800 kg/m3. The PU particles were 5 mm in size. The ratio of PKO-p to MDI was set at 1:1 and the loading of the concrete mixture was set at 3% w/w to produce lightweight concrete. The resulting concrete has excellent compressive strength (17.5 MPa) and thermal conductivity (0.24 W/mK). Results show that the PU particle dosage has the most significant effect on the physical and mechanical properties of concrete.

Rigid Polyurethane Foam with Ionic Liquid Modified Multi Walled Carbon Nanotubes Composites

2016 ◽  
Vol 857 ◽  
pp. 159-163
Author(s):  
A.A. Sinar ◽  
Z. Firuz ◽  
A.Z. Nur Hidayah ◽  
Md Akil Hazizan ◽  
H.A. Sahrim
Keyword(s):  
Carbon Nanotubes ◽  
Compressive Strength ◽  
Ionic Liquid ◽  
Rigid Polyurethane Foam ◽  
Average Cell Size ◽  
Average Cell ◽  
Pu Foam ◽  
Methylene Diphenyl Diisocyanate ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The rigid polyurethane (PU) were produced using ionic liquid (IL) modified multi walled carbon nanotubes (MWCNTs) by reaction of palm oil based polyol (POP) with methylene diphenyl diisocyanate (MDI). The 1-butyl-3-methylimidazolium tetrafluoborate (BMIMBF4) used as IL to disperse MWCNTs in PU foam by grinding in ratio 1:3 by weight of MWCNTs to IL till black paste were obtained. The effects of different percentage of modified MWCNTs (0.0 - 3.0 %) on Polyurethane / Multi Walled Carbon Nanotubes / Ionic Liquid (PMI) foam composites were evaluated in density, morphology and compressive strength. The density were increased higher 0.0538 kg / m3 at 3.0 % PMI. The average cell size value higher without addition modified MWCNTs and scanning electron microscopy (SEM) showed inhomogenously structure with addition of modified MWCNTs. Compressive strength with 0.5 % PMI showed the highest value 1.671 MPa compared to other PMI.

Renewable resources-based PTT [poly(trimethylene terephthalate)]/switchgrass fiber composites: The effect of compatibilization

2012 ◽  
Vol 85 (3) ◽  
pp. 521-532 ◽  
Author(s):  
Jeevan Prasad Reddy ◽  
Manjusri Misra ◽  
Amar Mohanty
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Renewable Resources ◽  
Melt Flow Index ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Flow Index ◽  
Methylene Diphenyl Diisocyanate ◽  
Trimethylene Terephthalate ◽  
The Impact

In this research, switchgrass (SG) fiber-reinforced poly(trimethylene terephthalate) (PTT) biocomposites were prepared by extrusion followed by injection molding machine. The methylene-diphenyl-diisocyanate-polybutadiene (MDIPB) prepolymer was used to enhance the impact strength of the biocomposites. In addition, the polymeric methylene-diphenyl-diisocyanate (PMDI) compatibilizer was used to enhance the mechanical properties of the composites. The effect of compatibilizer on mechanical, crystallization melting, thermomechanical, melt flow index (MFI), morphological, and thermal stability properties of the composites was studied. Thermomechanical properties of the biocomposites were studied by dynamic mechanical analysis (DMA). Scanning electron microscopy (SEM) was used to observe the interfacial adhesion between the fiber and matrix. The results showed that MDIPB and PMDI have a significant effect on the mechanical properties of the composites. The impact strength of MDIPB- and PMDI-compatibilized composites was increased by 87 % when compared to the uncompatibilized composite.

scholarly journals Biomonitoring of 2,4’–methylene diphenyldianiline for assessment of exposure to methylene diphenyl diisocyanate aerosol

2013 ◽  
Vol 4 (2) ◽  
pp. 208-213 ◽  
Author(s):  
Seyedtaghi Mirmohammadi ◽  
Ghasem Najafpour ◽  
Anees Ahmad ◽  
Ibrahim Hakimi
Keyword(s):  
Methylene Diphenyl Diisocyanate
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