PUR glue is used in composite fabrics and electronic products.

PUR Hot Melt - Humidity-cured reactive polyurethane hot melt
PUR, Chinese is called wet gas-cured reactive polyurethane hot melt. The main ingredient is isocyanate polyurethane pre-polymer. PUR's adhesion and toughness (elasticity) are adjustable and have excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance

. Reactive hot melt is under the condition of inhibiting chemical reaction, such as hot melt into fluid, so as to apply, two kinds of glue layer after the bonding cooling to act as bonding, and then with the help of moisture in the air and moisture attached to the surface of the viscous body to react with it, expand the chain, to produce a polymer with high concentration, so that adhesion, heat resistance, low temperature resistance and so on significantly improved. Because of its high reaction activity, it shows excellent adhesion to a variety of materials, in recent years has become one of the important varieties of adhesive industry, is widely used in packaging, wood processing, automotive, textile, mechanical and electrical, aerospace and other areas of the national economy.
PUR adhesives are molecular structures containing polar and chemically active urethane-based (-NHCOO-) or isocyanate-based (-NCO), with active hydrogen-containing materials such as wood, leather, fabric, paper, ceramics and other porous materials and plastics, metals, glass, rubber and other surface finish materials have excellent adhesion.
technical
milky solids
opening time 3mm thick 20C) 60-90 sec
to 1.12 g /cm3
viscosity (120 degrees C) 11±1pa.s
isocyanate 0.9 to 1.2%
bonding performance A1/A1 2.3±0.1Mpa
Bonding Performance ABS/ABS 3.4± 0.1Mpa
Adhesive < 155 degrees C
temperature (temperature resistance after curing) -40 degrees C to 95 degrees C
Use method
1, the PUR glue at 130 degrees C heating for 40 minutes, Use Noxin special pressure plate-type PUR hot melter 20kg (200kg) glue or pneumatic (or manual) glue gun to squeeze the glue in the need to bond the site, 1 minute to complete the fit.
2, bonded work pieces placed for 10 minutes can be trimmed to remove excess adhesive.
3, the well-trimmed work should be placed at 23 degrees C, 65% of the relative humidity after 24 hours before the next process can be transferred. Performance testing is available after one week.
4, construction should be carried out under good ventilation conditions, un cured glue can be erased with acetone, after the use of glue must be used with the company's matching detergent cleaning glue machine.
store the
. PUR glue should be stored in a dry, cool place. Avoid sun exposure and avoid contact with vapors, water and alcohol solvents. The shelf life is 6 months.
packaging
310ml aluminum tube, aluminum platinum bag 500g, 20kg/barrel.
compared to EVA hot melts, water-based/solvent-based adhesives, PUR has the following advantages:
. 1. Solvent-free, liquid type. Not like solvent-based adhesives need to have a drying process, there is no solvent environmental pollution and poisoning problems, to meet environmental protection requirements. The bonding process is simple, and the application method such as roller coating or spraying can be used.
2. Good operation. In a short period of time can be fixed two adhesives, so the assembly can be quickly transferred to the next processing process, improve efficiency.
3. Excellent resistance to heat, cold, water vapor, chemicals and solvents. Compared with the original hot melt adhesive, the listed properties and bonding strength are greatly improved due to the cross-linking structure of the reaction-type hot melt adhesive.
PUR hot melt in composite fabric applications
the current status of fabric composite glue
- water-based polypropylene system adhesive (cloth and cloth fit);
- solvent-based system adhesive (cloth and film bonding);
. PUR hot melt system adhesive (cloth and film bonding);
- EVA / polyurethane system (cloth and cloth bonding).
PUR hot melt glue and oil glue (solvent glue) comparison
cloth film application
PUR hot meltoil glue
environmental protection, solvent-freecontaining solvents, high
curing speed, high production efficiencyneed solvent volatilization, low production efficiency
need labor less requires a large number of workers
subject to environmental impact
0 degrees water-resistant wash 50 times, 90 degrees can also be washed 60 degrees washing 20 times
applying less glue applying large amount of glue
good feel general
PUR hot melt in composite fabric application
Note: black arrow refers to pur glue glue
typical PUR product introduction
project indicators.
appearance (room temperature) . Transparent
content 1
viscosity (Pa.S@100 degrees) 5.5-7
Opening hours (Min) ≥10
water-resistant washing 50 non-degelated



Generally using roll-on dot coating method
advantages
cost estimate can reduce costs by 30%
no waste water, exhaust gas
high degree of automation, easy to manage
solvent-free PUR polyurethane hot melt instructions
solvent-free PUR polyurethane composite glue PUR-103 for 100% solid content of single-component solvent-free polyurethane composite glue. PUR (PolyurethaneReactive), a hot melt for moisture-cured reactive polyurethanes. The main ingredient is isocyanate polyurethane pre-polymer. At high temperature after heating, pur adhesive molecules react with moisture or lively hydrogen substances in the air or on the adhesive to form a partial cross-networked structure, which makes bonding strength, chemical resistance, heat resistance, hydrolysing and other properties better than the general hot melt. PUR's bonding and toughness (elasticity) can be adjusted, with ordinary hot melt thermoplastic cold solid performance, easy bonding operation, a wide range of adhesive, high performance adjustability.
Solvent-free PUR polyurethane composite adhesive use
suitable for ordinary fabrics, fluorine-containing materials treated fabrics, polyester elastic silk, cotton, fiber, PVC, PET and TPU between the composite;
solvent-free PUR polyurethane composite glue specifications
project specifications
solid content 100% technology: 13929430431
components -NCO
viscosity of 90 degrees C about 6000mPa.s
density at23 degrees C 1.12g/cm3
odors a weak odor at the operating temperature, after curing tasteless
solor view transparent viscous liquid
equipment using reference temperature 90 to 120 degrees C
the 90-120 degrees C
solvent-free PUR polyurethane composite glue use method
coating volume: 5-35g/m2 is determined by the composition of unused fabrics, before use requires a small sample test.
operating temperature: 90-120 degrees C
curing cycle 25 degrees C, 36-48 hours (in the ambient humidity of 70% above the conditions
humidity needs to be adjusted according to the speed, machine and material, the maximum curing time of 3 to 4 days.
do not use solvent-free PUR polyurethane compound
avoid mixing with water or alcohol.
that the container is sealed and stored in a cool, dry and ventilated
must be used in protective equipment and ventilation environments.
away from children.
application of PUR hot melt in the field of electronic products
With the development and popularization of mobile phones, tablets, computers, electrical appliances, wearables and other electronic products, the application of electronic glue in this field is becoming more and more demanding. Mobile phones, televisions and so on are also towards intelligent, integrated, screw-free, borderless development, many traditional glue has been unable to meet the development requirements of modern smart devices, PUR hot melt is in line with the development requirements of smart devices and research and development of new electronic products adhesive.
pur hot melt compared to other electronic glue what outstanding advantages, why is widely used in the field of electronic products?
1. PUR hot melt solidified after strong bonding, high strength, to meet the majority of electronic products bonding requirements.
2. PUR hot melt than other electronic glue, it is easier to control the weight of glue, so can meet the current narrow border mobile phone design requirements.
3. PUR hot melt belongs to thermoplastic polyurethane, using PUR hot melt bonding products easier to disassemble, easy to repair.
the above three characteristics of PUR hot melt, it is decided that PUR hot melt than other glue, in the field of electronic products bonding more advantages.
PUR hot melt has become the industry's first choice for bonding, sealing, stacking, connecting, insulation, electronic protection and assembly. Specific applications include smartphones, tablet screen assembly, learning machines, GPS navigators, wearable electronics, window bonding, housing structure bonding, battery bonding, flat sealing, PCB assembly and protection, and more.
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