Item Units TB 3732 Remarks

Transcription

1 TECHNICAL DATA ThreeBond 3732 Thermal Resistant, Inorganic Adhesive Silicate and phosphate types of inorganic adhesive have always been used for application that requires thermal resistance at and above 400 C. However, such products do not have good water resistance, electrical properties, sealing ability and workability. Hence it is limited in its use. Three Bond 3732 uses a metallic alkoxide binder to afford the final adhesive with good water resistance, electrical properties and sealing ability. This helps to enlarge the use of such adhesive into other applications, previously deemed impossible. Three Bond 3732 can be used as a thick coating, with high filler loading. Characteristics Before Cure Item Units Remarks Appearance Main components White paste Aluminium Solvent Alcohol Viscosity Pa s {P} 10 {100} Specific Gravity 2.6

2 After Cure Item Units Remarks Temperature resistance limit C Above 1400 Seger cone method Coefficient of thermal expansion / C 75 x 10-7 Thermal conductivity cal/cm s C 6.1 x 10-3 Vickers hardness Hv kgf Bending strength Compressive push strength MPa {kgf/cm 2 } MPa {kgf/cm 2 } 9.81 {100} 2.6 {26} 1 Volumetric resistivity Ω cm 1 x Room temperature 2 x After 5h boiling Dielectric constant khz Dielectric loss tangent 4.1 x khz Water repellence 105 Contact angle with water Chemical Resistance 2 Water 0 Boiling, 2h 5% HCl 0 25 C x 24h 5% NaOH 25 C x 24h Toluene 0 25 C x 24h Methanol 0 25 C x 24h 1 : Test piece of iron ring with internal diameter 10 x height 5 mm, with the aluminium spindle of diameter 4 x height 10 mm (see diagram). Apply TB3732 onto the spindle and insert into the ring for curing. The spindle is then being pushed and the strength is determined. Al Fe 2 : The stainless steel plate was coated with and cured with heat. The test-piece was then immersed into different conditions. The results are based on the presence of crack, peeling or change in colour. 0 : No abnormality : Only crack or peel off observed.

3 Comparison table The following table compares the characteristics and performance of with other inorganic adhesive (silicate and phosphate types): Items Silicate adhesive Phosphate adhesive Solvent Alcohol Water Water ph Neutral Strong alkali Strong acid Curing temperature Room temperature ~ 150 C 120 ~ 200 C 200 ~ 300 C Bonding strength 1 Water resistance 0 x Dielectric property 0 x Wetting ability x x 1: Metal is attacked by acid and hence, causes the bonding strength to be reduced. Features 1. Good workability This product contains alcohol, which has a lower boiling point compared to water. This helps to reduce the drying time. As compared to other inorganic adhesive, it does not form bubbles, and hence does not affect the strength of the cured material. 2. Eliminate the influence of acid or base Previously, all inorganic adhesive contains either strong acid or base. Hence, great care in handling these products is exercised. Besides, the probability of corroding the base material is always present. contains alcohol and hence, eliminates such possibility of corroding the base material. 3. Water resistance contains metal in an alkoxide base. The cured material will thus have excellent water resistance, be it at room or boiling temperatures. 4. Excellent dielectric properties The binder of also contributes to its excellent dielectric properties. It also prevents its dielectric properties from diminishing, as it does not absorb much moisture. 5. Air-tightness contains micro-ceramic powder. Combined with the binder, it affords a compact structure to the adhesive, making it airtight and hence suitable for sealing purposes. 6. Comparing bonding strength with other inorganic adhesives

4 Item Units Silicate Adhesive Phosphate Adhesive Remarks Tensile shear strength Compressive push strength * Corrosion observed. kgf/cm ~ ~ 25 * Fe/Fe kgf/cm ~ 120 Below 1 * Fe/Al From the above results, it shows that it is not possible to obtain very high strength from the phosphate adhesive as it is acidic and can corrode the adherent, resulting in unreliable results. 7. Comparing boiling water resistance with other inorganic adhesives Stainless steel plates are coated with the respective material and immersed into boiling water. Visual inspection on the presence of crack, peel, dissolved part and change in colour was conducted. Silicate Adhesive Phosphate Adhesive No abnormality Crack, peel and dissolution observed. Dissolution and crack occurs. Hence, is excellent in boiling water resistance. 8. Comparing dielectric properties with other inorganic adhesives The material is cured with heat and placed in different conditions. The dielectric resistance is then obtained. (Units: MΩ) Conditions Silicate Adhesive Phosphate Adhesive 24h at room temperature ~ 5 4 ~ 10 After thermal curing 30 ~ 500 ~ 1 week after placing in 40 C x 95% RH. 0 0 ~ 30 The above results verify the excellent dielectric property and water resistance of. 9. Comparing water resistance with other adhesives Place anhydrous calcium chloride at the mouth of the test-tube containing the respective cured materials. The test-tube is then placed into 40 C x 95% RH for 72 hours and the moisturising rate and moisture absorption rate was obtained. Item Units Silicate adhesive Phosphate Adhesive Moisturising rate + moisture absorption rate g ~ ~ 0.26

5 The above results verify that the has better air-tightness to ensure a ½ ~ 1/5 of the moisturising rate and moisture absorption rate. 10. Relation between curing condition and shear strength (Material: SPCC-SD Units: kgf/cm 2 ) can cure at room temperature. It can also be cured at elevated temperature. The reaction at elevated temperature forms a stronger material, with better properties. The following chart shows the effect of curing condition on the shear strength. In the case of leaving the material at room temperature over a long period of time, the reaction continues and affords a final material of good bonding strength. Handling Method 1. Preparation This is slurry and sedimentation may occur. Hence, before opening the aluminium-laminated vinyl bag, it is important to rub to help in mixing the contents. Remove the grease with calcium soda water, trichloroethylene or surfactants. It may also be necessary to sandpaper or sandblast the top-layer of coating to effect strong bonding. In the event of wanting to dilute the material, alcohol may be used (methanol, ethanol, isopropanol etc.). However, it is necessary to take note of the following: (a) Not to add in more than 5% of the solvent (b) Not to use solvent that contains a lot of water or moisture. 2. Application For bonding, potting or coating Application Bonding, potting Coating Method Spatula, pallet, syringe, pipette, dispenser, etc. Spatula, pallet, bar-coater, dispenser, etc. When the application time is long, the solvent will evaporate, resulting in an increase in viscosity. Hence, the use of dispenser is recommended. If additional information on dispenser is required, please do not hesitate to contact our Sales Personnel. 3. Curing Method It is possible to cure at room temperature. However, to improve the various properties, it is necessary to subject the parts to heat. In whichever way, the solvent will evaporate at temperatures 50 C and below. The curing condition will change with the thickness of the bonding layer, the material of the adherents and also the shape and size of the material. For thick bonding layer, in order to prevent and avoid crack or bubble formation, the time required for the solvent to evaporate at room temperature ~50 C has to be monitored. If the time left at room temperature is too short, bubble formation may occur. If it is too long, the tendency to form cracks will be present.

6 For Bonding For Potting For Coating Room temperature x 1h Room temperature x 2h Room temperature x 30 min or 50 C x 30 min 50 C x 4h 50 C x 1h 100 C x 30 min 100 C x 30 min 100 C x 30 min The above are recommended conditions and are based on our own experiments. When adhering the actual parts, there is a need to assess and confirm the curing condition. 4. Handling after use Pour the remainder of the unused adhesive into a glass container, which is fitted with a tight cover, and store. Long term storing may result in absorbing moisture and evaporation of solvent, leading to the possibility of deterioration of the product. In the case of contact with skin and equipment, wash with alcohol or thinner or soap and water immediately. Major Applications Bonding of ceramic, glass or metal Coating or potting of sensor or elements Sealing of heater Fixing of electronic and electrical parts near heat-emitting source Fixing or potting of spark plug High temperature parts Bonding of heat resistant thermoset Anti-corrosive coating Coating against carbon or sludge For other parts with requirements of heat resistance, organic solvent resistance or weather resistance. Handling and Storage Precautions Before opening the bag, squeeze it gently to mix the contents thoroughly. Avoid storing in a high temperature or humid area. Store in a cool dark place. For the remainder, seal before storing. Do not mix with water. This will cause gelling and the product cannot be used. To dilute, use high purity alcohol. The equipment coming into contact with the adhesive can be washed with alcohol or thinner. Harmful. Do not inhale or ingest. In the event that this product is ingested, consult a physician immediately. If using a large amount of this product or using for a long time, it is compulsory to ventilate the area well. If necessary, use mask, non-permeable gloves, protective glasses. Ventilate well with local exhaust equipment.

7 In case of eye contact, do not blink or rub eyes. Wash under running water for about 15 minutes. Consult a physician immediately. In case of abnormal reaction, stop using, consult a physician. Do not use on human body. Persons with allergies or who are sensitive should not use this product. In case of contact with skin, wipe with a dry cloth and wash affected area with soap and warm water. Please read direction and brochure carefully before use. Keep away from children. Avoid direct sunlight; store at room temperature (5 ~ 35 C). Do not incinerate, emits poisonous gas. Disposal should be handled by hazardous waste disposal professionals. This product is flammable. Please take the necessary precautions in storage and handling (refer to MSDS). For industrial use only. Packaging 1kg, 200g aluminium laminated bag Shelf Life 6 months at 5 C Diclaimer (Do not use for household purposes) For Industrial Use Only The data contained in this report are obtained from experimental results, based on our test methods. We cannot assume absolute responsibility for accuracy and safety. Before using this product, use your own judgement to determine whether or not this product meets the requirements of the application and objectives. This includes the burden of responsibility and hazardous danger. The extent of the guarantee provides replacement for products, which are clearly unsatisfactory. We assume responsibility for neither injury nor property damages resulting from the misuse of this product. We do not assume responsibility without written notice or contract.