The reinforcement of the board is divided into two types: “back mesh” reinforcement on the back of the board and infiltration reinforcement on the surface of the board.
[1, “backnet” reinforcement]
”backnet” reinforcement means High-strength fiber protection net
hole mesh size is generally 5×5mm? Snow, bonded to the back of the board by epoxy resin, and the strength of the board is strengthened after drying. The width of the whole fiber protection net is divided into different specifications from 1.2 to 1.8 m, and the weight is generally about 900 g/m2.
According to the actual needs of the board, the “back mesh” reinforcement process can be used to reinforce various large and thin plates that need to be reinforced, such as marble, granite, travertine and onyx.
can choose ordinary epoxy resin for the back mesh reinforcement of the board, low, medium and high viscosity series of epoxy resin can be used for sheet reinforcement. Usually, the most used ones are reinforced sheets of low-viscosity epoxy resin. Their solidification time is about 30-50 minutes at 25 °C. If the ratio of curing agent is adjusted, some low-viscosity epoxy resins are at 25 °C. The setting time can be shortened to 30-40 minutes, and the solidification time of other low viscosity epoxy resins can be shortened to 8-12 minutes. It takes about 24 hours for the epoxy resin to fully cure at room temperature. If the oven heating method is used, the time for complete curing can be significantly shortened.
Solidification time is an important process parameter for backing reinforced sheets. It depends on the number of backing reinforced sheets, the output, the operation method of the backing process, and whether or not the drying oven is used, or dried. Factors such as the drying capacity of the furnace. If the number of plates to be reinforced in the production line is large and the production requirements are high, a mechanical machine/backing net reinforcement method may be adopted, and a natural full solidification method at a normal temperature or a flat type solidified heating drying furnace may be selected. If the production requirements are very high, even a vertical drying oven can be selected. In this case, a low viscosity epoxy resin with a shorter solidification time should be used.
For some production lines with small reinforcement and low output, manual back-grid operation, natural full-solidification at room temperature, and low-viscosity epoxy resin with relatively slow solidification time can be used to reduce Investment in production line equipment.
[2, surface penetration strengthening]
Some stone surfaces have many fine cracks, some fine cracks even penetrate deep into the board, although the reinforcement is still strong The requirements for grinding and polishing or finished sheet cannot be met. At this time, it is necessary to choose to intensify the surface. The front osmosis reinforcement process includes infiltrating the highly permeable epoxy resin glue into the gap of the surface of the board, and after drying, grinding and polishing.
should choose a low-viscosity epoxy resin with good permeability for the surface penetration strengthening treatment. If the solidification time is too short, the penetration depth of the epoxy resin on the sheet will be reduced, and the reinforcement effect will be affected. influences. Typical low viscosity epoxy resins have a longer set time and typically take more than 50 minutes. However, there are also some low-viscosity epoxy resins with good permeability, and the solidification time is only 15-30 minutes. If the sheet has many fine cracks, it is reasonable to use a high permeability epoxy resin with a long setting time. If the crack of the sheet to be infiltrated is relatively coarse, a high permeability epoxy resin having a faster setting time can be selected. Therefore, the choice of solidification time must be appropriate and reasonable, and the length of solidification time is also achieved by adjusting the proportion of epoxy resin components.
The surface penetration strengthening epoxy resin has a solidification temperature of 25 ° C, a minimum curing temperature of 10-15 ° C, and a complete curing time of 24 hours at normal temperature. In the stone production line equipped with automatic repairing and drying unit, the drying equipment adopts a flat horizontal drying furnace or a vertical vertical drying furnace to heat-treat the surface reinforced and strengthened sheet to accelerate the epoxy resin. Fully cured. For some simple stone production lines with low production requirements, natural curing at room temperature can be used. At this time, it takes at least 24 hours to obtain fully cured reinforcing sheets.
Because of the wide variety of stones and different shades of color, the surface infiltration and reinforcement treatment is carried out on the surface of the board. Therefore, when selecting the epoxy resin used for the surface treatment of the sheet, the color and the sheet must be considered. The colors are the same, or can be reasonably matched, and the traces of the epoxy resin cannot be left after the reinforcement treatment. There are a variety of epoxy resins available on the market, and there are many colors, so you can find the right color.
If the condition of the finished board is bad, the temperature difference is very large. For example, some stone sheets used for outdoor in the tropical or cold zone, when selecting epoxy for reinforcing such boards, should also be considered after curing. The operating temperature of the epoxy resin. This type of epoxy resin suitable for outdoor use has a curing temperature of -25 to +60 °C.
(provided by Shenyang Building Materials Network) <
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