Underwear dispenser manufacturers choose underwear hot melt adhesive Why choose low temperature resistance? I will tell you immediately:
The weather is cold in winter, and many customers who consulted in the north often said that the hot melt adhesive on their products became brittle or even fell off when they were shipped. I usually ask what kind of hot melt adhesives are used by these customers. Most of them will say that they are white and transparent. The main reason is that the price is relatively cheap. The problem of low temperature does not appear until the product is shipped or after the customer's hand, causing unnecessary losses, so here I will introduce you to the common EVA hot melt adhesive and polyamide (PA) What is the difference between the material and the low temperature resistant hot melt adhesive made of polyester (PES)
1.EVA (ethylene-vinyl acetate copolymer)
EVA resin is an odorless, non-toxic, white or light yellow powder or granular low-melting polymer. When MI is large, the molecular weight is small, the synthesized low-temperature hot-melt adhesive has low viscosity and good fluidity.
Advantages: good adhesion, flexibility, heating fluidity.
Disadvantages: low strength, heat resistance, cold resistance, oil and corrosion resistance, can not be used as structural adhesive.
Application: EVA hot melt adhesives are widely used in objects that are everywhere in our daily life.
2. Polyamide (PA) hot melt adhesive, polyester (PES) hot melt adhesive
Polyamide (PA) and polyester (PES) hot melt adhesives are good choices for more demanding products. Due to the high melting point and good chemical resistance to many compounds, including many common solvents, plasticizers and oils. Provides flexible opening times from a few seconds to about a minute, and can provide excellent adhesion to various substrates (including metal, paper, wood, and many plastics such as PVC and surface-treated polypropylene and polyethylene) .
Application: Excellent oil resistance, chemical resistance and temperature resistance, flame retardancy and high strength make these two materials hot-melt adhesives become the choice of harsh application environment. The main applications of environmentally friendly hot-melt adhesive products include automotive, electronics, shoe materials, packaging, furniture and other industries. Models are developed according to industry requirements. The high temperature resistance can reach 200 degrees and the low temperature resistance can reach minus -40 degrees.
3. The difference between polyamide (PA) hot melt adhesive and EVA:
Compared with other hot melts such as EVA and polyolefin, polyamide hot melt adhesives have higher creep resistance under load, usually higher than EVA and polyolefin hot melts, and have better temperature resistance and weather resistance.