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UV-curable adhesive equipment and its applications and features

UV-curable adhesive is a high value-added fine chemical widely used in the glass and jewelry industry, glass furniture, medical, electronics, electrical, optoelectronics, optical instruments, automotive.
UV-curable adhesives are known as third-generation acrylate adhesives (TGA). Compared with general adhesives, although UV adhesives are subject to certain restrictions, for example, UV curing equipment is required, the adherend must have light on one side, etc., but UV glue is still very advantageous. Features, it fully complies with the “3E” principle, namely energy saving, environmental protection, economy, it has the following irreplaceable advantages:
1, no need to mix single component system.
2, curing fast, controllable, in seconds.
3, no dissolution, environmental protection, no pollution.
4, suitable for highly automated processing.

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One-component polyurethane glue metering pump

Since the shape of the rubber coating of the windshield is relatively thick (triangle), the amount of glue used is relatively large. If the glue metering device is not used, it is difficult to ensure the stability of the shape of the glue in the automatic coating system, so the glue is automatically applied in the polyurethane glue. The system needs to be configured and calculated for the glue device. There are two basic forms of the glue meter for the glue.
1, the gear pump is metered for glue. The metering glue device adopts a servo motor through a reducer, and the coupling drives the gear metering pump to supply glue. The gear metering pump uniformly supplies glue to the meshing force of each gear, and controls the speed of the gear metering pump through the servo motor to perform glue flow. Real-time control.
2, plunger type metering pump for glue This glue uses plunger type metering glue. Its working principle is: firstly inject the glue into the plunger pump through the two-position three-way solenoid valve, then the two-position three-way solenoid valve switches to the column The plug cylinder is connected with the glue gun, and the glue in the plunger pump (sufficient for one working cycle) is extruded by hydraulic servo or by the servo to drive the ball screw, and the extrusion speed of the glue is controlled by the servo control and the robot.

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Photovoltaic power junction box potting and bonding

Photovoltaic power junction box potting and bonding
The glue used for bonding the junction box is the same as the glue used for the aluminum frame; the glue used in the junction box has two components, one component and two components.
Potting process: The potting process of the junction box is divided into line potting and under-line potting. The line potting is the junction box under the potting, and then bonded to the PV module back plate, the line potting It means that the unfilled junction box is first bonded to the back panel of the PV module and then on the automatic production line.

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Automotive windshield polyurethane automatic dispensing system

Automotive windshield polyurethane automatic dispensing system
Modern car design, especially for car design, uses direct bonding technology for the window glass. This assembly process connects the window glass with the body, which greatly increases the rigidity of the body and improves the sealing effect of the window. The early window glass bonding process was adopted in the United States, using a two-component polysulfide adhesive. Due to the complexity of the two-component dispensing equipment, automotive windshield adhesives now basically use better performance singles. Component moisture-curing polyurethane glue. In order to ensure the quality of bonding, today’s window dispensing basically uses an automatic dispensing system.

One-component polyurethane automatic dispensing system
The viscosity of polyurethane glue is very high, especially when the viscosity is increased rapidly below 5 °C, so the viscosity can be reduced by heating slightly. For the characteristics of polyurethane glue, it is common to use a double-column plunger pump with large cross section to improve The rubber water bottom plate presses the rubber strength, and the rubber water water bottom plate has a heating function to better assist the plunger pump to press out the glue. The plunger pump optional pressure ratio is usually greater than 60:1. In order to reduce the pressure drop of the glue, the rubber hose is discharged. Both use high-pressure hose with heating and heat preservation function, and its diameter is at least 25.4mm, to ensure that the flow rate of glue meets the requirements of dispensing speed; then the polyurethane supply system is double pump configuration to ensure the automatic dispensing system. normal work.

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After PCB is dispensed glue curing equipment processing

After PCB is dispensed glue curing equipment processing
After dispensing on the PCB and placing the components, the glue should be cured as soon as possible. There are many curing methods, such as heat curing, photo curing, photothermal double curing and ultrasonic curing. Among them, photocuring is rarely used alone. Magnetic field curing is usually used for color sealing and curing agents. The most common curing methods are 2 kinds. .
Thermal curing can be divided into oven intermittent heat curing and infrared furnace continuous heat curing according to equipment conditions.
Drying of the oven means that a certain number of PCBs that have been dispensed and mounted are placed in batches on the rack, and then placed together in a constant temperature oven for curing. Usually, the temperature is set at 150 °C to prevent PCB and yuan. The device is damaged.
The curing time can be as long as 20-30min or less than 5min. The oven is equipped with a blower to create convection, avoiding temperature differences between the top and bottom, and keeping the temperature constant. The oven curing operation is simple and the investment cost is small, but the heat energy loss is large and the required time is long, which is not conducive to the production line flow operation.
Infrared oven curing, also known as tunnel curing, has become the most common curing method for dispensing. The equipment used is not only suitable for the curing of glue, but also for the reflow soldering of solder paste. Since the dispensing has a strong absorption capacity for specific infrared wavelengths, it takes only a short time to cure in the infrared furnace. The infrared furnace has high heat efficiency and is beneficial to the production line. The curing curve used in the infrared oven differs depending on the performance of the glue and the difference in the infrared furnace equipment.

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Dispensing needles are used in a variety of dispensing methods

1, Needle transfer: first position the needle on the top of the plastic container, so that the needle is immersed in the glue; when the needle is lifted from the glue, due to the surface tension, the adhesive adheres to the needle; then the adhesive will be glued The needle of the agent is aligned with the pad pattern on the components of the PCB, and then the needle is slowly moved vertically downward.
In practical applications, the transfer of the needles is carried out in a momentary manner, and at the same time, multi-point dispensing is performed.
Needle transfer is widely used in the manual dispensing process, and automated needle transfer equipment can also be used. The success or failure depends on the viscosity of the adhesive and the warpage state of the PCB. The advantage of the needle transfer is that it can complete many yuan at a time. Dispensing of the device, equipment investment is small, but the dispensing is difficult to control, and the glue tank is hollow and easy to mix impurities.
2, Pressurized injection: also known as injection dispensing or dispenser dispensing, is the most common method of dispensing. First put the adhesive into the syringe, add compressed air from above or use a rotary mechanical pump Pressurize, forcing the glue to drain from the needle and drip to the required position on the PCB.
Air pressure, temperature and time are important parameters of dispensing. In addition to controlling the inlet pressure and dispensing time, the glue storage container often has a temperature control device to ensure the viscosity of the glue is stable. These parameters control the amount of glue. The size, state, pressure and time are adjusted reasonably, which can reduce the drawing phenomenon. The glue with high viscosity is easy to draw, and the viscosity is too low, which will lead to too much glue and even glue. In order to accurately adjust the dispensing volume and the accuracy of the dispensing position, a microcomputer control can also be used to automatically dispense the glue according to the program.
The characteristics of pressurized injection are adaptability, especially suitable for multi-variety products, easy to control, can easily change the amount of glue to meet the requirements of different sizes of components; and the adhesive is in a sealed state with stable performance.
3, Screen printing; screen printing method similar to ink printing, is a method suitable for flat glue. It has the advantages of fast, accurate, good repeatability, saving glue and improving the quality of dispensing. After completing the dispensing process, the components should be dispensed manually, semi-automatically or fully automatically according to the accuracy of the product, the amount of production and all the equipment and process conditions, and then the adhesive is cured to fix the components. Printed on the board.

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Needle tube packaging adhesive dispensing system for glue fluid

Needle tube packaging adhesive dispensing system for glue fluid, such as cyanoacrylate instant glue, one-component epoxy glue, UV glue, one-component silicone sealant, one-component polyurethane glue, and the like. There are also two components, such as two-component epoxy glue, two-component silicone, two-component polyurethane glue and the like. The syringe packaging adhesive dispensing system can be designed to be semi-automatic or fully automatic.
Single-package single-component low-viscosity glue liquid automatic glue water power source is compressed air, with a unique air pressure control system and high-speed solenoid valve system, capable of accurate and consistent dispensing control. Programmable control, debugging flow control, broken glue, back suction function, no dripping glue liquid. The single-package automatic dispensing system can be used in IC packages, LCD packages, and more.
The two-package two-component low-viscosity and single-package low-viscosity dispensing system is similar, except that the double-tube head is equipped with a static mixer, and the mixing principle of the static mixer is mechanically mixed using a long and narrow curved pipe. The two-component mixing is continuous, automatic, saves time, and does not need to be manpowered, safer and cleaner, and reduces the waste of glue, and the operation is clean and neat. Double-tube packaging automatic dispensing system can be used for electronic, electrical structural parts bonding, potting and other purposes.

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Electronic component three anti adhesive vibration, insulation, anti-adhesion

Electronic component three anti adhesive vibration, insulation, anti-adhesion

After the SMT soldering process, in order to make the components anti-vibration, insulation, anti-glare, especially for coil components, it must be fixed and sealed. It is also necessary to use an adhesive that acts as a positioning seal. The positioning sealant should have the following characteristics:

1, the appropriate viscosity, easy to sizing operation.
2, moisture-proof, anti-vibration, good insulation performance.
3, the surface drying time should not be too short, usually about 30min is appropriate, in order to facilitate the adjustment of components such as coils during this period.
4, according to the needs of the product, sometimes need to use a fully cured adhesive, and sometimes need to use a self-adhesive type to facilitate the replacement and repair of components.

Electronic component three anti adhesive is various synthetic rubbers and polyesters that can be used as adhesives for positioning sealants. These rubbers have high cold resistance, air tightness and electrical insulation, and high bond strength and elongation. These glues are used for positioning and sealing. The glue should be formulated into a solvent-based adhesive when used. When the viscosity changes, it can be diluted with a solvent at any time. When applying glue, hand-coating is carried out using a pneumatic injection device and a watering can, a brush or a brush.
However, because such glues contain solvents, which are harmful to the atmosphere and the human body, there is a tendency to be replaced by RTV organic silica gel. As a positioning seal, a one-component room temperature vulcanized silicone rubber is used, which has good electrical insulation. Adhesive, plastic cylinder packaging, can be directly sized.

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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