Company News_News_Shanghai Weilian Industrial Co., Ltd.

11-12 

Can AVENTK UV glue solve the shadow problem of bonding materials?

As we all know, to use UV glue, at least one side of the adhesive material needs to be transparent and light-transmissive, so that the UV glue can fully receive the UV light, so as to quickly crosslink and cure to achieve the effect of bonding. However, a large part of the plastic PC of elevator keys is translucent, and UV light is not easy to penetrate, resulting in incomplete curing and insufficient bonding strength. In response to this situation, AVENTK plastic bonding UV glue can not only be used for bonding transparent materials, but also can achieve high bonding strength for the bonding of translucent PC plastics and stainless steel parts that block UV light.

11-12 

Spray water-based non-curing bonding without heat melting

The water-based cold construction type non-curing rubber asphalt waterproof coating is an upgraded product of the ordinary non-curing rubber asphalt waterproof coating. It retains the non-curing and high solid content characteristics of the non-curing waterproof coating, while solving the problem that the conventional non-curing rubber asphalt must be heated before construction The problem. The product does not need to be heated and can be sprayed directly at room temperature (between 0-40°C). No heating is required, which greatly saves energy. After the construction is completed, the product can not be cured after long-term contact with air, is insoluble in water, has high bonding strength, and can adapt to complex construction work surfaces; it can automatically find leaking parts to repair the damaged waterproof layer, which is permanently leak-proof; waterproof The layer does not contain solvents, which meets the requirements of national safety and environmental protection. It has outstanding creep performance, good waterproof performance, and aging resistance, which can meet various waterproof requirements in engineering construction.

11-12 

Polystyrene board bonding material

Polystyrene board bonding material as an adhesive for external wall insulation, as an adhesive widely used in construction sites, must have the following characteristics: (1) It has good water resistance and atmospheric aging resistance. According to the requirements of my country's current external wall insulation specifications, it should It can be used for more than 25 years. (2) The bonding strength is not necessarily too high, but it must have good adhesion to inorganic and organic materials, that is, to hydrophilic and hydrophobic surfaces. (3) It is convenient to use, easy to prepare and construct on site, and has a long pot life. (4) The cost cannot be too high, and the price can be accepted by the construction industry.

11-12 

What is siliceous polystyrene board?

Grade A silicon modified insulation board is an upgraded product of polystyrene board. It uses polymer technology and uses professional equipment to combine organic and inorganic materials to produce excellent comprehensive performance-fire protection, heat preservation, energy saving and environmental protection. Material. Grade A siliceous modified insulation board keeps the thermal insulation of polystyrene board while increasing its fire resistance, reaching A2 grade non-combustible, so it is called Grade A siliceous modified insulation board!

11-12 

Are extruded boards and polystyrene boards classified as thermal insulation materials?

Grade A silicon modified insulation board is an upgraded product of polystyrene board. It uses polymer technology and uses professional equipment to combine organic and inorganic materials to produce excellent comprehensive performance-fire protection, heat preservation, energy saving and environmental protection. Material. Grade A siliceous modified insulation board keeps the thermal insulation of polystyrene board while increasing its fire resistance, reaching A2 grade non-combustible, so it is called Grade A siliceous modified insulation board!

11-12 

The development of nano-coating materials

Nanomaterials can be divided into three categories: one is one-dimensional nanoparticles; the other is two-dimensional nanosolids (including films and coatings, tubes, wires); and the third is three-dimensional nanomaterials (including mesoporous materials). Nano materials have good mechanical properties, such as high strength, high hardness and good plasticity. The yield strength and hardness of metallic materials increase as the grain size decreases. At the same time, plasticity and toughness are not sacrificed. The surface effect and quantum size effect of nanomaterials have a great influence on the optical properties of nanomaterials. For example, its infrared absorption spectrum has a broad band, the fine structure in the absorption spectrum disappears, and the mid-infrared has a strong light absorption capacity. The smaller the particle size of nanomaterials, the shorter the mean free path of electrons, and the more serious the deviation from the ideal periodic field, which makes its conductivity special. When the grain size reaches the nanometer level, the metal will show non-metallic characteristics.　The big difference in magnetic structure between nanomaterials and conventional materials must be manifested in magnetic properties. When the grain size is reduced to a critical size, conventional ferromagnetic materials will become paramagnetic or even in a superparamagnetic state. The specific surface area/volume of nanomaterials is very large, so it has quite high chemical activity, especially in terms of catalysis, sensitivity and response performance.

11-12 

What are the characteristics of polyurethane potting glue? Is the operation process complicated?

What are the characteristics of polyurethane potting glue? 1. The obvious characteristic of polyurethane encapsulant after curing is its low hardness, which is harder than silicone encapsulant, but softer than epoxy resin encapsulant. This glue has moderate strength and once cured, it can exhibit a variety of properties. Such as waterproof, moisture-proof, insulation and flame retardant, etc. 2. After curing, the polyurethane potting glue can play a very good protective effect, has good anti-vibration performance, and also has good anti-corrosion performance. 3. After curing, it will present a layer of bright adhesive film, this layer of adhesive film can isolate dust and water from entering the electrical components, and can protect the electrical components for a long time. 4. Polyurethane potting sealant has a scientific formula. After curing, it has good adhesion to various metals, rubber, plastics and wood materials, and there will be no corrosion. Once corrosion occurs, you need to consider whether the quality is qualified. Under normal circumstances, the product performance of buying brands is more secure. For example, Cosmore focuses on the research of polyurethane encapsulants and provides customized application solutions for polyurethane encapsulants, with a wide range of uses , Can be used in new energy, military, medical, aviation, shipbuilding, electronics, automobiles, instruments, power supplies, high-speed rail and other industries.

11-12 

What are the welding process parameters and welding materials, and how are they preheated before welding?

1. Welding problems occur in low alloy steel during welding Low-alloy high-strength steels with lower strength grades, such as 300-400MPa grade, have good weldability due to the low content of alloying elements in the steel, which is close to low-carbon steel. With the increase of alloying elements in steel, the strength level increases, and the weldability of steel gradually deteriorates. The main problems that arise are: 1. Hardening tendency of heat-affected zone Steel grades with less carbon content and lower strength grades, such as 09Mn2, 09Mn2Si, 09MnV steel, etc., have little hardening tendency. With the increase of the strength level, the tendency of hardening also begins to increase. For example, when 16Mn, 15MnV steel is welded, rapid cooling will result in the appearance of martensite structure in the heat-affected zone. 2. Cold cracks When welding low-alloy high-strength steels, the tendency of cold cracks in the heat-affected zone is increased, and such cold cracks often have a delayed nature, which is very harmful. For example, a large container with a wall thickness of 115 mm made of 18MnMoNb steel, due to insufficient preheating temperature, formed a large number of cold cracks in the heat-affected zone after welding. The tack welds of low-alloy high-strength steels are easy to crack. The reason is that the welds are small in size, short in length, and fast in cooling. Such cracks are cold cracking. 3. Hot cracks Generally, hot-rolled and normalized steels with strength grades of 294 to 392 MPa have a low tendency of hot cracking. Hot cracks will also appear in the multi-layer submerged arc welding bead. During electroslag welding, if the carbon content of the base material is too high and contains nickel, hot cracks in the shape of a figure eight may appear in the electroslag weld. Medium-carbon quenched and tempered steel (such as 30CrMnSiA steel) with strength grade of 800~1176MPa is more sensitive to hot cracking during welding.

11-12 

How to improve the surface adhesion of the material?

Good adhesion is extremely important. The adhesion of the surface plays a decisive role in the bonding process. If an adhesion promoter (primer coating) or vacuum plasma process is used, it is not environmentally friendly or costly. After precise pretreatment and fine cleaning of the bonding surface by atmospheric pressure plasma process, users can use advanced solvent-free UV adhesives and water-soluble materials. Due to the effective activation of the surface, mutually incompatible substances can also be bonded together, so that the adhesive can adhere to surfaces that are otherwise difficult to bond (such as non-polar plastics). Additional chemical primers Pretreatment or surface polishing and washing become unnecessary. This also avoids the emission of volatile hydrocarbons (VOC) during the production process.

11-05 

Analysis of the Causes of Poor Tin Eating in Soldering Iron Automatic Soldering Machine

The automatic soldering machine is no stranger to people who are in contact with the soldering industry. It is mainly used to manipulate the movement of the robot hand to complete...