Price distribution of injection glue manufacturers in Nanzheng County
GST Modified epoxy steel adhesive Application method and construction points
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1. Surface treatment
Surface treatment is a key process, including treatment of bonding surface of reinforced components and steel plate bonding surface.
The bonding surface of concrete components shall be treated according to the new and old degree, firmness, dryness and wetness of the component surface according to the following four conditions:
(1) For the bonding surface of very old and dirty concrete components, first use a stiff brush dipped with detergent to brush away the oil dirt and dirt on the surface; Then polish the bonding surface and blow off the powder particles with oil-free compressed air to remove the 2-3 mm thick surface layer until the new surface is completely exposed (after treatment, if the surface is seriously uneven, epoxy repair mortar can be used to repair); Before pasting, the bonding surface shall be wiped clean and dried completely.
(2) If the concrete surface is not very dirty or old, the bonding surface can be polished directly to remove the 1~2mm thick surface layer, remove the dust with compressed air, and wipe it clean until it is completely dry.
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(3) For the bonding surface of new concrete, the loose scum on the surface shall be brushed off with a wire brush first, and then polished to remove laitance and dust, and then wiped clean until it is completely dry.
(4) For concrete components with high humidity or concrete components with an age of less than three months, the bonding strength of general resin adhesives on the wet base will be greatly reduced, so in addition to meeting the above requirements, the concrete components must be manually dried.
The bonding surface of steel plate shall be treated in the following two ways according to the corrosion degree of steel plate:
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(1) If the steel plate is not rusted or slightly rusted, sand blasting, abrasive cloth or flat grinding wheel can be used to polish it until metallic luster appears. The surface of the steel plate shall be polished as rough as possible, and the lines polished shall be perpendicular to the force direction of the steel plate as far as possible. Wipe it clean later.
(2) If the steel plate is seriously rusted, it must be soaked in moderate hydrochloric acid for 20 minutes to make the rust layer fall off; Rinse with lime water to neutralize acid ions; After that, use a flat grinding wheel to grind out the lines.
2. Unloading; In order to reduce and eliminate the stress and strain hysteresis after sticking the steel plate, the components should be unloaded appropriately before sticking the steel plate.
Sales technical consultation telephone; *** Manager Cui *** Manager
3. Prepare adhesive; The adhesive for sticking steel structure is two-component, which can be solidified only after being mixed evenly in proportion on site. The method of preparing adhesive can refer to the following operations: prepare a desk scale, a clean container (usually plastic basin or iron bucket), dry cotton yarn, spatula, mixing appliance, etc. before preparing adhesive. Before weighing, components A and B shall be fully stirred up and down respectively. Note that the glue taking tools A and B cannot be mixed. Sales technical consultation telephone; *** Manager Cui *** Manager
In a clean container, weigh components A and B according to the glue proportion marked on the product package. Use manual or rubber mixer to mix in the same direction. After mixing to be basically uniform, turn over all the rubber to another container and continue mixing until the color is completely uniform, so as to ensure that there is no dead corner of uneven mixing. When the rubber mixer is used, the mixing speed should be slow (400-600 rpm), and the mixing time should be about 3-5 minutes. Special attention shall be paid to: incorrect mixing ratio or uneven mixing will seriously affect the performance of structural adhesive.
Sales technical consultation telephone; *** Manager Cui *** Manager
Every time the glue is mixed, it must be weighed and used at any time. The glue should not be too much, otherwise it is difficult to mix evenly and may cause unnecessary waste. The prepared glue should be used up within the application period (about 40 minutes in summer and 90 minutes in winter).
4. Paste steel plate
After the adhesive is prepared, apply it to the treated concrete bonding surface and the steel plate bonding surface with a spatula at the same time. In order to make the adhesive fully infiltrate, penetrate, diffuse and adhere to the bonding surface, a small amount of adhesive should be used to scrape back and forth on the bonding surface; Additional plastering can make the glue on the bonding surface of the steel strip thick in the middle and thin at the edge, and the plastering thickness at the midpoint of the plate is 3~5mm; Then stick the steel plate to the predetermined position.
After pasting the steel plate, gently tap the steel plate along the pasting surface with a hammer. If there is no cavity sound, it indicates that it has been pasted tightly. Otherwise, the steel plate should be peeled off, repaired and re pasted (all operations should be completed within the applicable period of the adhesive).
5. Fixation and pressurization
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The steel plate shall be fixed with fixtures, supports or expansion bolts immediately after being glued. And pressurize appropriately to make the adhesive just extrude from the edge of the steel plate. The expansion bolt is generally used as an additional anchoring measure for the steel plate for a long time, and the embedded holes should be drilled together with the steel plate before gluing.
6. Curing
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It can be solidified under normal temperature contact pressure, and shall be fixed immediately after construction to avoid disturbance during solidification. At 25 ℃, the fixture or support can be removed after one day of curing, and can be used under stress after three days; When the ambient temperature decreases, the curing time will be prolonged accordingly. If the ambient temperature is lower than 5 ℃, infrared lamp (or iodine tungsten lamp) heating and other heating measures shall be taken or low-temperature curing modified products shall be used.
