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Dental adhesive filling caries cavity type and related applications

Dental adhesive filling caries cavity type and related applications

Dental adhesive denture soft lining material, also known as elastic denture lining expansion material for filling, is used for tooth-based tissue bonding. It can cushion the bite force and evenly transmit the bite force to the alveolar ridge, thus reducing or eliminating toothache. . Denture base resin is PMMA, which is a rigid organic resin. It is made by adding methyl methacrylate solution of terminal hydroxyl group to diene polyurethane to the initiator system and photoinitiator. The visible solid-state adhesive can be made after coating. After being irradiated with a visible light curing machine for about 90 seconds, the soft lining material and the adhesive can be cured to make it adhere.
Dental adhesive The methacrylic filling material of the caries cavity has been rapidly developed for filling in recent years, and many new and better varieties have appeared. This type of filling adhesive is characterized in that the cured product has the same color tone as the tooth surface, high compressive strength (about 200-300 MPa), no saliva, strong bonding strength with dentin, and the like. The disadvantage is that the performance of the hanging grinding is poor, and there is a certain harmful effect on the pulp due to residual monomers. In addition, color change caused by the addition of a normal temperature polymer initiator is also a problem.
There are 2 types of dental adhesive for filling. One of them is a methyl methacrylate-based composite resin composed of a methacrylic acid monomer and a polymer thereof and a fine glass powder, which is cured by tri-n-butyl boron and a redox system normal temperature polymerization initiator. The second one is a condensate of bisphenol A and glycidyl methacrylate, and 70%-80% by mass of quartz powder or special glass powder is added thereto to prepare a high-viscosity paste, and benzoyl peroxide is used. Or a tertiary amine redox system is allowed to cure at room temperature by a polymerization initiator. Due to its high viscosity, it is used by applying a low-viscosity pretreatment agent to the tooth surface treated with phosphoric acid and washed with water to form a thin coating, which is then coated with bisphenol A methyl methacrylate. a condensate of glycerides. This pretreatment agent is a condensate of bisphenol A methacrylic acid glycidyl ester diluted with a dimethacrylate monomer by a methacrylate monomer to which a conjugate is added.
The effect of dental pit and fissure sealing technology (ART) anti-caries has been recognized by everyone. Longqi has a significant pre-effect on the running-in surface, and it can make up for the insufficient effect of fluoride on the pit and sulcus. More significant. The operation process is as follows: wash the residue in the pit and groove, wash with a cleaning solution, then scrub with water, dry the dry cotton ball, mix the glass ion cement (Katac-motar, ESPE) according to 1:1 ratio, confiscating After mixing evenly, press the finger into the joint gap and the crack, and use the hand-held instrument to remove the excess glass ion material. Note that the cotton should be wetted and disinfected during the whole process.
The method of constructing tissue engineering cartilage by using polyhydroxybutyrate scaffold is used for the construction of human tissue engineered bone, and the repair of cartilage defect has also been reported.

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Electronic electrical adhesive types in industry applications

Electronic electrical adhesive types in industry applications
Epoxy resin category One-component and two-component: potting, encapsulation (including COB); bonding, fixing; SMT patch, underfill, bare die bonding; conductive, thermal conduction.
Organic silicone single-component and two-component: potting, encapsulation; bonding, fixing; electronic device anti-radiation / anti-static; conductive, thermal.
UV glue: potting, bonding, sealing, laminating
SGA: bonding, fixing
Instant adhesive: bonding, fixing
Anaerobic adhesive: bonding, sealing, screw locking
Polyurethane two components: potting

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Construction adhesives features and species in the construction decoration

Construction adhesives features and species in the construction decoration

Engineering adhesives for construction or construction adhesives features: Epoxy resins, acrylic adhesives, organic silicone adhesives, polyurethane adhesives, modified silane sealants, etc. Compared with general engineering adhesives, architectural engineering adhesives have the following features.

1, Requires easy use of adhesives, curing conditions are not very strict, can be used in the conditions of production and construction site to allow; at room temperature (5 degrees -35 degrees) under appropriate pressure conditions, faster curing process.
2. It can bond the wet surface and the oil surface without strict surface treatment.
3, The use of a large amount of raw materials required, adequate, low prices.
4, Non-toxic, no stimulation. The site did not have good ventilation conditions and required no harm to the operators and did not pollute the environment.
5, Supporting construction tools is more important than other adhesives. There are various kinds of adhesive materials, and the joints and locations of the parts to be adhered are different. It requires a variety of sizing tools to be used in combination, such as glue guns, spray guns, and constant pressure syringes.
6, After curing not only requires a high enough bond strength, but also resistant to atmospheric aging.

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Dispensing needle cap or cover is widely used to seal

Dispensing needle cap or cover is widely used to seal
Dispensing needle cap or cover is widely used in various sealing liquids and glues:
Room Temperature Vulcanized Silicone Rubber, Epoxy Sealant, Polyurethane Sealant, Unsaturated Polyester, Acrylate, Seal Putty, Neoprene Sealant, Elastomer Sealant, Liquid Sealant, Polysulfide Rubber Sealant , other sealants
Dispensing needle cap or cover sealing sites are also extensive:
Agricultural farming, electronics industry, electrical appliances, car decoration and more.

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UV glue storage attention problems for manufacturer

UV glue storage attention problems for manufacturer.

Shadowless adhesive (uv adhesive), also known as photosensitive adhesive, UV curing adhesive, is a type of adhesive that must be cured by ultraviolet light.

Uv glue as a chemical has a certain degree of commonality with other chemicals, but also has certain characteristics.it has many common points with other adhesive products. The custody and storage aspects are basically similar to those of most chemicals. manufacturers should pay attention to several aspects in UV glue storage.

1 Normally stored uv glue should be stored in a dedicated warehouse to take care of it.

2uv glue should not be placed outdoors in open air, even if it is temporarily placed.

3 The uv glue of all varieties should be clearly numbered, meticulously classified, and must not be placed in a random manner.

4 The uv glue varieties that need stacking should pay attention to the storage height, so as to avoid deformation leakage and collapse of the packaging, which may cause safety hazards.

5 Keep the uv glue warehouse ventilated and dry. Conditions permit use of exhaust and cooling facilities.

6 Seriously implement the principle of first-in, first-out, and the product is regularly cleaned up and inventoryed.

These are all small jobs. As long as each link is seriously responsible, the stability and reliability of uv glue can be achieved in a relatively perfect condition. Avoid unnecessary losses and troubles.

Of course, in use, we cannot lack the UV glue tool.

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Automotive adhesive application introduction development

Automotive adhesive application introduction development

Automotive adhesive application is with the development of automotive products in environmental protection, energy conservation, safety and comfort, lightweight, low cost, long life, and pollution-free development, the development and application of new high-quality automotive adhesives/sealants has become an increasingly important topic for the automotive industry. Mainly in the following areas:

First, environmental protection and energy conservation, water-based materials have begun to emerge and replace the oil-based adhesive, sealed products. The use of water-based paints can replace the widely used PVC plastisols instead of asphalt-based damping plates used in cars. As the water-based material can be air-dry or dry, the damping coefficient is higher than that of PVC and asphalt materials, and it has less pollution to the environment and has a good application prospect.

Second, wet touch wet PVC sealing material, in order to adapt to the paint shop energy-saving emission reduction, to adapt to the wet touch technology PVC material has also been developed and gradually applied, the new car plant paint shop is no longer set up PVC pre-drying Furnace to increase production efficiency and save energy. This process requires that PVC sealing materials (sealant, anti-knock paint, and antiskid protection coating for skirts) have a good match for intermediate paints.

Third, to adapt to low temperature ovens and wide temperature range welding products, drying oven drying shop has a lower and lower trend, in order to achieve the purpose of energy saving, so the new requirements for adhesives in the welding shop Requires that it can also be cured at a lower furnace temperature and achieve better performance in different temperature ranges.

Fourth, the application of water-based interior plastic, non-VOC waterborne polyurethane, waterborne neoprene, etc., can be widely used in automotive interior parts, a variety of environmentally friendly materials, bonding, increase car comfort.

Adhesive/sealant is one of the important process materials in automobile production. Its function penetrates into every link of the automobile manufacturing process. The structure of the car is enhanced, sealed and rust-proof, vibration reduction and noise reduction, thermal insulation, sound insulation, and internal and external protection. Decoration plays a special role in simplifying the manufacturing process, reducing the weight of the car body, and promoting the application of new structural materials in automobiles.

Automotive adhesive application introduction development ,we can use viscose tools improve productivity.

Welding adhesive

Spot welding seals, vibration damping, hemming, structural bonding, cavity filling, reinforcements

Coating adhesive

Weld sealant, vehicle bottom PVC paint, hot melt sealant for body cover, assembly adhesive, sealant, polyurethane glass glue, damping film, interior decoration adhesive

Engine gearbox adhesive

Thread locking and sealing, Pipe thread sealing, Flange sealing, Cylindrical holding, Casting microporous sealing

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Silicone sealant for building construction best curing time

Silicone sealant for building construction best curing time.

When after we use glue gun to building construction, many people do not consider the best curing time.We often see that many consumers and even construction parties will hold the newly cured adhesive on the pull, test its performance, and some will compare with the glue cured for several days; in fact, it is also very unscientific. We already know that the After crosslinking the construction of silicone sealant in the 24h after curing is basically only up to 60% of the strength, after 72h can reach 75% to 80% of the strength. , if you need to achieve the best strength of the acid glue needs 7-14 days, neutral plastic Is longer.

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Engineering Adhesives Application in Electronics and Electric Industry

Engineering Adhesives Application in Electronics and Electric Industry

Electronic industry various types of electronic equipment (including military electronic equipment), instrumentation and its components and electronic materials
In the production of materials, the application of adhesives has an important and special role. As electronic appliances dragon it is military
With the development of miniaturization, light weight, multi-functionality and high performance, electronic equipment will use new adhesive processes and adhesives, such as adhesives to meet the requirements of different adhesive strengths, with high strength and medium strength; According to the needs of the production process, the design of high temperature, medium temperature and room temperature curing; also high temperature and ultra-low temperature and has insulation, conductivity, permeability, thermal conductivity, damping, absorbing microwave function and other properties of the adhesive ,
It can be used to bond two kinds of materials with different properties, uneven thickness, different sizes, and even tiny. To achieve the purpose of stick-welding, stick-typing, and thread-bonding, the process can be greatly simplified, the cost can be reduced, the production cycle can be shortened, and the production efficiency can be improved.
Electronic equipment and components to ensure its stable performance and normal and effective work in a variety of harsh environments, will use advanced technology measures to improve its insulation and environmental adaptability. The usual method is to use an adhesive for moisture-proof insulation to prevent intrusion of external dust, moisture, and salt mist, and to prevent components from being damaged by mechanical vibration, impact, or to achieve sound insulation, heat insulation, and flame retardancy.
Recently in the field of electronics industry, from various radar, navigation, communications, radio and television, instrumentation, large computers; from transistors, large-scale integrated circuits, printed circuit boards, connectors, to transformers, micro motors, microelectronic devices All kinds of adhesive sealants are widely used in such production. Engineering adhesives used in the electronic/electrical industry include:
1 , component potting ;
2, chip encapsulation, COB encapsulation;
3 , PCB board covered ;
4, no device seal, and fixed;
5, conductive, thermal bonding. ,
6, chip bonding;
7, structural parts bonding;

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Silicone sealant curing time for the construction process

Silicone sealant curing time for the construction process:Many constructors are eager to speed up the solidification of silicone rubber production companies in pursuit of construction time or construction speed. In fact, this practice is very wrong.

The reaction of the crosslinker with the base polymer to form a network of Si-O-Si frameworks is a complex process. If the reaction time is too short, the skeletal structure may be too small, resulting in less strength and brittleness after the glue is cured; at the same time, the glue may not fully infiltrate the substrate and cause the adhesion strength to the substrate to decrease; and may also be due to curing. The small molecular gas produced during the process of rapid solidification cannot be volatilized and accumulated in a timely manner from the uncured colloids, thereby generating bubbles that make the surface of the sizing surface uneven and affect the appearance; (such situations are more common in summer outdoor construction), if blindly Fast requirements, the quality of the project will inevitably be affected. Of course, too slow curing speed can also cause problems such as contaminated stone. Therefore, it is recommended that the general surface drying time at room temperature is about 20-50min.

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Silicone Sealant Environmental Requirements for Use of Construction

Silicone Sealant Environmental Requirements for Use of Construction.Due to the curing method of silicone sealant for construction, the following usage restrictions must be observed when using it:

Not suitable for the surface of building materials that seeps out grease, plasticizers or other solvents;

Not suitable for frosted or wet surfaces, airtight or long-term soaking occasions;

Not suitable for paint surfaces, seal failure may occur due to cracking or peeling of the paint film;

Not suitable for surfaces that are in direct contact with food or are subject to mechanical wear;

It is not suitable for construction at noon or when the surface temperature of building materials is lower than 4°C or higher than 40°C;

Non-structural adhesives are prohibited for structural assembly.

Various glues have their own relative usage restrictions such as:

Acid glue: Corrosion to copper, brass and other metals, not suitable for all kinds of stone and iron carbide matrix materials;

De-alcohol glue: It is not suitable for direct construction at noon or in the sun, and should not be used in fluorocarbon materials;

Loss of adhesive: There are traces of corrosion to metals such as copper, brass, and silver, and should not be used in the mirror industry.