Formula:
721-3 resin 8%
800 mesh quartz powder 19%
400 mesh quartz powder 11%
80 mesh quartz sand 13%
60 mesh quartz sand 17%
80 mesh glass 8%
10 mesh glass 6%
40 mesh white glass 18%
Coupling agent 2% (resin content)
Quartz stone molding process:
The synthesis of quartz stone is currently mainly controlled by a computer in a vacuum die-casting machine. In the process, the curing is mostly at medium temperature. Mix the fillers of different meshes according to the required ratio, mix it with the resin that has been added with the medium temperature initiator and color paste, and pump it send it to the hopper on the upper part of the pouring machine, and stir and mix. At the pouring port, use the console to control the moving speed and direction of the pouring port and the material is poured into the prepared mold at the cutting speed. After the pouring is completed, the mold is sent to the bottom of the press and pressed by vacuum and high pressure. Then high-temperature treatment, and finally polished to make a finished product.
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1. Selection and mixing of raw materials
Looking for high-quality quartz minerals and other additives. The raw materials of quartz minerals with a variety of particle sizes are removed and extracted by special purification equipment. Pure, remove the wood chips, metal scraps, and other impurities that may be contained, and then transport it to the raw material mixing tower to gradually add minerals and others. The agent is uniformly mixed. The impurity-free raw materials and uniform mixing are the fundamental guarantees for the defect-free board.
2. Thickness forming
The proportioned and mixed raw materials enter the super-large forming machine, and the flatness and thickness of the sheet blank are measured by the computer-induced thickness setting equipment Precise adjustment, directly placed on the belt conveyor after forming, forming only one sheet at a time.
3. Vacuum die casting
The formed blank is precisely controlled by the computer in the vacuum die-casting machine. The vacuum equipment installed underground removes the void in the mineral void
The air is exhausted to close to the vacuum, forming the closest accumulation of ore, mineral powder, and other additives to achieve a non-porous effect. The work of each sheet. The business time is about 15 minutes. The vacuum die-casting of each super-sized sheet is used to ensure the density and non-porousness of the material. The larger the sheet size, the better the guarantee of the process.
4. The plate from the vacuum die-casting machine is directly sent to the drying room at 90-110℃ and cured at medium temperature for 50-120min.
During the period of baking in the baking room, the quartz stone slab reaches a certain degree of curing. Ensure the excellent properties of the board.
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5. Surface polishing
On the automated roller conveyor line, the large slab is moved slowly, passing through 36 large-scale special grinding heads from thick and thin, high-speed rotation, and back and forth. Under the uniform motion, supplemented by a large amount of cooling water and different abrasives, the surface is polished into a particularly glossy mirror effect. Thus the surface treatment is fully revealed.
In addition to the above-mentioned medium temperature curing, one sheet at a time molding process, there are two other methods that customers use. Curing at room temperature is consistent with the above process, only adding a certain proportion of room temperature cobalt accelerator () and curing agent methyl ethyl ketone peroxide. exist after pressing and molding, without the above-mentioned 4-step medium-temperature baking, at room temperature, after the plate has a certain degree of solidification, it enters the oven for baking.
It should be pointed out that the quality of quartz stone is directly related to the content of resin. The higher the content of quartz in the quartz stone, the tree. The lower the fat content, the better the quality, and the closer it is to natural, the less deformable it is. Experts pointed out that when the content of the resin in quartz stone is greater than 10%. The corresponding technical indicators will drop accordingly, and the quartz stone at this time can no longer be called the real quartz stone.
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Frequent problems with quartz stone:
1. Cracking
If the amount of curing agent added is too large, the gel time of the resin will be very fast, and a large amount of heat will be released quickly, causing cracking. The temperature of the drying floor is too high during curing, causing cracking. Due to a large amount of filler added, the gel time of the resin is too slow, the resin and the filler cannot have a certain degree of adhesion in a short time, resulting in cracked. The exothermic heat of the resin itself is too large. The main reason is that the exothermic peak at 80°C is too high. The toughness of the resin is relatively small, the hardness is too large, and the strength is too high, and the shrinkage causes the product to be too hard. During the production process, the fabric is not very uniform, with a large amount of material in some places, and a small amount of material in some places, resulting in different shrinkage and different cracking. During the pressing process, uneven pressure applied can also cause cracking.
2. Deformation
The strength of the resin itself is insufficient. Due to incomplete curing. It can increase the curing time of the resin, or increase the amount of curing agent, the curing temperature of the curing agent, and the type of curing agent, the pressure of the press is not enough, causing deformation.
