Abstract: Due to the unevenness of artificial quartz stone products, it is common that the product is not dense enough, which affects the use of artificial quartz stone. This article analyzes the reasons for this and proposes its own solution.
Keywords: artificial quartz stone compactness raw material shape and ratio mixing effect molding principle
At present, the domestic consumption of building materials is fierce. With its natural texture, super hardness, and super abrasion resistance, artificial quartz stone products have gradually become the green and environmentally friendly building materials decoration products that are deeply loved by consumers. However, the artificial quartz stone products on the domestic market are uneven, and the product compactness is generally insufficient. The reason is that the product has a large number of micropores that cannot be observed with the naked eye; this affects the compactness of the product, the water absorption rate of the product, and the product Anti-fouling and anti-freezing properties will ultimately affect the use of artificial quartz stone products. In order to solve these shortcomings of artificial quartz stone and produce high-quality artificial quartz stone products, we have done the following research.
The compactness factors that affect the artificial quartz stone products are as follows:
One: Comparison from the raw material shape and ratio of artificial quartz stone
Since the raw materials accounting for more than 90% of artificial quartz stone are glass, natural quartz stone, and natural granite, the compactness of the product is directly related to the shape and ratio of the raw materials; in order to increase the fluidity of the product in the molding stage, the raw material is required to be larger than The shape of the 0.2mm particles is closest to the spherical shape, and the order of the particle fluidity size is obtained from the experiment: spherical>cylindrical>cone>flaky body.
With raw materials of a relatively ideal shape, it is necessary to mix these raw material particles in a certain proportion to achieve the most ideal filling state. Experiments show that the secondary particle size particles can fill 60% of the voids created by the previous particle mixing. , The rest of the gap is filled by finer granular raw materials, powder, and resin.
Two: mixing effect
The mixing effect of the mixer directly affects the uniformity and compactness of the artificial quartz stone product. The mixing effect is related to the rotation speed of the mixer, the shape of the mixing pad, the ratio of the amount of resin, the feeding sequence of the materials, and the mixing time. Experiments show that the mixing speed is from low to high, the mixing blade is diamond-shaped, the resin content is less, the order of material feeding is aggregate-resin-powder-resin, and then high-speed stirring for 3-5 minutes at the end of the blanking process. The dispersion of the materials is the most uniform, and its agglomeration rate is less than 3%.
At present, the molding principles of domestic and international artificial quartz stone products are: resin-bonded quartz stone powder vacuum vibration pressure molding; resin plays the role of bonding and filling; quartz stone powder plays the role of skeleton support; vacuuming is beneficial to remove air and draw out the resin Styrene gas; vibration is to enhance the fluidity during molding; pressurization plays a role in compacting the product. According to the forming principle, we can get the appropriate resin dosage, reasonable quartz stone ratio, higher vacuum degree, higher vibration frequency, and suitable pressure conditions. The artificial quartz stone product produced under the conditions of compact structure and finer micropores can be obtained. Less, the lower the water absorption, and vice versa. Our vacuum degree is above -0.100MPa, the vibrating body speed is within 4000r/min-4500r/min, and its molding effect reaches the international peer level; compared with the same ingredients, the vacuum degree is -0.095MPa, and the vibrating body speed is 3000r/ The density of the artificial quartz stone produced under the condition of min—3500r/min is greatly improved. It is shown that the density of the former is 0.75%—1.5% higher than that of the latter when the material is the same and the maximum particle size is the same, and the water absorption rate is The former is 33%-50% smaller than the latter. The anti-fouling and anti-freezing properties of the former product have been significantly improved.
Below we take the three types of influencing factors into account, and the data passed through the experimental test are summarized as follows:
Take the artificial quartz stone products sold on the market and the artificial quartz stone produced by our experiment under the condition of the same maximum aggregate particle size and the same ratio.
Under the same maximum particle size (3～4mm), ideal raw material shape and the same stirring process parameters, the same vacuum degree -0.095MPa conditions, the effect of the vibration body speed on the water absorption: (vibration time 2 minutes)
Under the same maximum particle size (0.8～1.2mm), ideal raw material shape and the same stirring process parameters, and the same vacuum degree -0.098MPa, the effect of the speed of the vibrating body on the water absorption: (vibration time 2 minutes)
From the above experiments, it is concluded that the compactness of the artificial quartz stone product is related to the shape of the raw material, the ratio of the raw material, the stirring effect, the vacuum degree, and the speed of the vibrating body. When the shape of the raw material is close to the spherical shape, the raw material ratio is optimal, and the stirring effect is evenly dispersed. , The artificial quartz stone product produced under the condition of increasing the vacuum degree above -0.098MPa and the vibrating body speed above 4000r/min has the best compactness, the least micropores, and the lowest water absorption. This greatly improves the anti-fouling and frost resistance properties of artificial quartz stone products, so that artificial quartz stone products can be widely used in cabinets, dining tables, laboratory benches, floors in public places, indoor wall panels, and outdoor wall panels.