What are the new materials that can be used to make hot melt pressure sensitive adhesives?

Whether it is the leather shoes that people wear on their feet today, or the car forums that are speeding on the road, the main material is rubber products. Although there are still some natural rubbers on the market today, many more products are actually made of composite materials. There are too many rubber products on the market, and in addition to some other materials, there is one ingredient that is indispensable, that is, hot melt adhesive film materials.

So which kind of hot melt adhesive film product is used for rubber materials, and why should you choose it? What are the characteristics of rubber materials? Although there are some differences between synthetic rubber and artificial rubber, they are generally similar in terms of composition, and they are basically a material with latex as the main component.

This material has very good abrasion resistance and elasticity, but at the same time has a relatively poor high temperature resistance ,...

1. Mainly used for the production of shoes, hats, the use of the glue not only has a crisp, plump appearance quality, but also has the characteristics of natural smoothness after washing, can be worn without ironing, the use of the glue shoes, the cap is light and breathable, good shape retention, especially for the shoe industry, but also has the advantages of wearing comfort and reducing shoe odor.

2. Food, beverages, instant noodles, cigarettes, beer, medicine and other packaging sealing, big key rollers are completed by using hot melt adhesive through the sealing machine, the book binding industry has abolished the old line, nail binding, and changed to hot melt adhesive bonding process, which not only improves the quality of binding, but also greatly speeds up the binding speed.

3. Lixun is mainly used for women's sanitary napkins, children's diapers, hospital mattresses, elderly incontinence products, etc., especially the latter, with the continuous aging of China's population structure, the demand for elderly incontinence products will increase rapidly in the future.

4. China is a country lacking in wood, except for a small number of high-end furniture using solid wood, usually most of the furniture is made of fiberboard, shavings or sawdust board, and the edge of the furniture board must be bonded with hot melt adhesive to bond the edge banding material to increase the aesthetics, similar to solid wood furniture.

First of all, the nozzle of the hot melt glue should be cut, then inserted into the glue gun, and the switch button of the glue gun can be opened to be aimed at the use part normally. Or use a lighter to heat the hot melt adhesive and then apply it to the place where it needs to be used, and then apply it evenly, and then glue it.

When using hot melt adhesive in winter, the first thing to pay attention to is the temperature, so the temperature of the use range should be kept above 15 degrees in order to be able to exert its characteristics, and the phenomenon of glue opening is likely to occur.

If you use a melter for union, then you should also pay attention to the temperature inside the machine, which should be more than 10 degrees to 20 degrees.

At the same time, it should be noted that the quality of hot melt adhesive is the quality of the glue, many glues on the market contain formaldehyde, so it is recommended that you choose some of the best when choosing, so as to be more environmentally friendly.

The hot melt adhesive is flame-proof, anti-fire, and has no harm to the human body.

When the hot melt adhesive is constructed, its curing speed is relatively fast, and its adhesion and flexibility are relatively good, so it does not need to spend most of the time to bond.

The life of hot melt adhesive is relatively long, and it has the performance of water resistance and moisture resistance, and it is also relatively cheap.

The gloss of the hot melt adhesive is relatively good, and it is also more convenient when storing, and there is no great requirement for the storage environment.

Hot melt adhesives are used to bond leather, glass, metal, wood, luggage plastics, medical, textiles, etc. Hot melt adhesive is a kind of plastic adhesive, its physical state changes with temperature within a certain temperature range, and the chemical properties remain unchanged, it is non-toxic and tasteless, and is an environmentally friendly chemical product. Because the product itself is solid, it is easy to package, transport, store, solvent-free, non-polluting and non-toxic.

Hot melt adhesives are used to bond leather, glass, metal, wood, luggage plastics, medical, textiles, etc. Hot melt adhesive is a kind of plastic adhesive, its physical state changes with temperature within a certain temperature range, and the chemical properties remain unchanged, it is non-toxic and tasteless, and is an environmentally friendly chemical product. Because the product itself is solid, it is easy to package, transport, store, solvent-free, non-polluting and non-toxic.

With the integration of electronic devices such as smart phones, tablet computers, and smart wearables, the development of screwless, and bezel-free, many traditional adhesives can no longer meet the design and use requirements of modern smart devices. Reactive polyurethane hot melt adhesive is a new type of electronic product adhesive developed in response to the current requirements of intelligent electronics development.

Reactive polyurethane hot melt adhesives, also known as PUR hot melt adhesives, are one-component, do not contain organic solvents, can be applied at lower temperatures, have a long open time, and can be cooled and solidified after sizing to complete the initial bonding. It is cured by moisture in the air, and has excellent bonding strength and impact resistance after full curing; It has extremely high reactivity and exhibits excellent adhesion to a wide range of materials.

Performance characteristics of PUR hot melt adhesives:

1. One-component, solvent-free;

The solid content makes it easier to control the thickness of the glue, so it can meet the design requirements of the current narrow frame mobile phone;

3. Its adhesion and toughness are adjustable, and it has excellent bonding strength;

4. Good temperature resistance, chemical corrosion resistance and aging resistance, which can meet the requirements of waterproof, dustproof and high and low temperature resistance;

5. Due to its extremely high reactivity, it shows excellent adhesion to a variety of materials.

These characteristics of PUR hot melt adhesive determine that PUR hot melt adhesive has more advantages in the field of electronic products than other adhesives, and has become the first choice in the bonding, sealing, laminating, connecting, insulation, electronic protection and assembly of smart electronic devices, and in the screen assembly of smart phones, laptops, tablets, and wearable devices; Bonding of headsets, GPS navigators, windows, batteries and other electronic industries; It is widely used in automobiles, plastics, metals, lenses, box assembly and other fields.

As a 100% solid composition, no solvent or water components of hot melt adhesive.

Due to its advantages of high bonding strength and fast curing speed, it is widely used in many fields such as electrical appliances, automobiles, building materials, non-iron, food packaging, book binding, furniture industry and so on.

Its types are roughly as follows:

1.vinyl acetate), poly ethylene

Application: Ordinary type of hot melt is mainly used for the bonding of packaging boxes.

2.Rubber, polyurethane

Uses: Flexible and strong tensile It is mainly used for sealing waterproof and heat insulation, especially for pressure-sensitive components that have adhesion at normal temperature.

3.Polyamide and polyester uses: When special conditions are required, it can especially exert high performance such as heat resistance and oil resistance.

EVA hot melt adhesive is a solvent-free, 100% water-free solid fusible polymer; It is solid at room temperature, heated and melted to a certain temperature to become a liquid that can flow and has a certain viscosity. The molten EVA hot melt adhesive is light brown or white in color. EVA hot melt adhesives consist of basic resins, tackifiers, viscosity modifiers, and antioxidants.

**。Basic resin.

The basic resin of hot melt adhesive is the copolymerization of ethylene and vinyl acetate under high temperature and pressure, that is, EVA resin. This resin is the main ingredient in making hot melt adhesive, and the proportion and quality of the basic resin determine the basic performance of hot melt adhesive. The selection of EVA melt index is also very important, the smaller the melt index, the weaker the fluidity, the higher the strength, the higher the melting temperature, and the poor wetting and permeability of the sticky.

On the contrary, if the melt index is too large, the melting temperature of the glue is low, the fluidity is good, but the bond strength is reduced. The selection of additives should be based on the appropriate ratio of ethylene and vinyl acetate.

**。Tackifiers.

Tackifiers are one of the main additives for EVA hot melt adhesives. If only the basic resin is used for the adhesion at a certain temperature, when the temperature drops, it is difficult to wet and penetrate the paper, lose the adhesion ability, and cannot achieve the bonding effect; The addition of tackifier can improve the fluidity of the colloid and the wettability of the adherent, improve the adhesion performance, and achieve the required bond strength.

**。Viscosity modifiers.

Viscosity modifiers are also one of the main additives for hot melt adhesives. Its function is to increase the fluidity of the colloid, adjust the solidification speed, in order to achieve the purpose of rapid bonding and firmness, otherwise the hot melt adhesive viscosity is too large, can not or is not easy to flow, it is difficult to penetrate into the book, it can not be bonded firmly. By adding a viscosity regulator with a low softening point, you can achieve the purpose of good penetration and firm bonding during bonding.

**。Antioxidant.

The right amount of antioxidant is added to prevent premature aging of EVA hot melt adhesives. Because the colloid will oxidize and decompose at a high temperature when melting, the addition of antioxidants can ensure that the adhesion properties do not change under high temperature conditions.

In addition to the above raw materials, it can also be equipped with some cold resistants suitable for cold zone temperatures or heat resistant agents suitable for tropical temperatures according to the difference in temperature and region.

The main raw material is EVA, which accounts for about 20%, followed by some petroleum resins, different formulas have different brands, different models of resins, about three or four. Then there are many other chemical raw materials that are used in smaller quantities, such as tackifiers, whitening agents, rosin and so on. Then, there will be a more important material, that is, filler, which is currently used in the industry with industrial calcium powder.

1. Hot melt adhesive is mainly processed from polymer particles such as PA, EVA, TPU, PES, etc.

2. Different hot-melt adhesive products have different production and processing techniques, but they are all processed with these polymer particles as the main raw materials.

Hot melt adhesive is a type of plastic adhesive.

Within a certain temperature range, it can change with the change of temperature, it is non-toxic and tasteless, and it is an environmentally friendly chemical product. Because the product itself is solid, easy to package, transport and store, solvent-free, non-polluting, non-toxic, with the advantages of simple production process, high added value, high adhesive strength, fast speed, etc., it is a solid glue, which is heated and melted to a certain temperature at room temperature to form a liquid that can flow and has a certain viscosity.

The melted hot melt adhesive is light brown or white, and the hot melt adhesive consists of a base resin, a tackifier, a viscosity modifier, and an antioxidant.

Hot Melt Adhesive Selection Method:

1. The color requirements of the glue are different. If there are no other requirements for the color of the object itself, it is recommended to use yellow hot melt adhesive. In general, yellow hot melt adhesives are more adhesive than white hot melt adhesives.

2. Surface treatment of the substrate. The surface treatment of hot melt adhesive is not as strict as that of other adhesives, but the dust and oil stains on the surface of the adhesive should also be properly treated to make the hot melt adhesive better bond.

3. Operation time. Quick handling is the main feature of hot melt adhesives. The operation time of hot melt adhesives is usually about 15 seconds.

With modern production methods, the use time of hot melt adhesives is required to be shorter and shorter. For example, hot melt adhesives used in book binding and speaker manufacturing require an operating time of about 5 seconds.

4. Temperature resistance. Hot melt adhesives are temperature sensitive. When the temperature reaches a certain level, the hot melt adhesive begins to soften. If it falls below a certain temperature, the hot melt adhesive will become brittle. Therefore, in the choice of hot melt adhesives.

5. When viscosity, the temperature change of the environment where the product is located must be fully considered, which can be divided into early viscosity and late viscosity. Only when the early viscosity is consistent with the later viscosity can the hot melt adhesive and the adhered object remain stable.

The materials that hot melt adhesive can bond will definitely exceed what most people think, because the applicable industry of hot melt adhesive basically covers all aspects of our daily life. For example:

1) The clothes we wear contain hot melt adhesive: shirt cuffs, necklines, plackets, leather jackets, etc. all need to be bonded with hot melt adhesive;

2) The shoes we wear contain hot melt adhesive: whether it is leather shoes, sports shoes, canvas shoes, sandals, and high heels, hot melt adhesive needs to be used as a composite adhesive;

3) Home decoration materials are also inseparable from hot melt adhesives: seamless wall coverings, curtain fabrics, table cloths, home textile fabrics, wooden furniture materials, and even doors all need hot melt adhesives for bonding and compounding;

4) As an important means of transportation for our daily travel, the use of hot-melt adhesive is more extensive: automotive interior headliner cloth, seat cover, carpet assembly, damping soundproof panel, soundproof cotton, etc. are inseparable from hot-melt adhesive composite.

Understand what materials can be glued to hot melt adhesives.

Hot melt adhesives can be used on many materials, I will name a few: metal, PCB board, ceramic, glass, paper, electronic components, fiber, wood, stone, leather, cement products, plastics and other materials. Specifically, which kind of hot melt adhesive is better for which material, you can ask Knorr hot melt adhesive.

Hello landlord!

Hot melt adhesive is mainly used for fixing and "welding", but the force of fixing and "welding" is relatively small, such as fixing the bottom mold in the pad printing process.