Common stone repair materials and methods
In fact, people have been continually trying to explore some good methods and materials to repair and make up for some common defects in stone, in order to improve the overall quality and effect of stone, which is especially important in the large-scale production and application of today's stone. Like people's own pursuit of beauty. Of course, whether it is the beautification of human beings or the repair of stone defects, it is inseparable from the generation and application of some new technologies and new materials. Innovative and timely application of some scientific and reasonable new materials, in order to make the effect of stone repair more perfect, and this effect can not be limited to the factory, but also to maintain the installation and use, in order to maximize the overall benefits.
1, waxing
Wax treatment of stone board surface is one of the earliest applications, the lowest cost, and is also the most commonly used method for some stone manufacturers to obtain better gloss and board surface effect. It can cover some small cracks on the cover surface and also increase the luster and color of the stone. However, this method and material cannot solve the problem fundamentally, and the effect is less durable. If the coated sheet is used outdoors, it will expose its original appearance in a short period of time. In addition, the wax coated stone is not breathable due to the wax plugging the pores of the stone, which often causes the stone to cause lesions, and at the same time makes the stone protection treatment difficult. The wax also absorbs dust, making the surface of the treated stone susceptible to contamination.
2, unsaturated resin applied to stone repair and reinforcement
Some stone materials have natural cracks and holes, which makes the surface of the board poor, and the damage rate is high during processing and installation, especially for stone and some large-size plates. Therefore, people introduce unsaturated resins into the repair and reinforcement of stone.
The name of the unsaturated resin science we call is an unsaturated polyester resin. When a linear polymer compound obtained by polycondensation of a saturated or unsaturated dibasic acid with a saturated or unsaturated diol is dissolved in a single When a body (usually referred to as styrene) becomes a viscous liquid, we call it an unsaturated polyester resin. The unsaturated polyester resin is a thermosetting resin which, when heated or an initiator, can be cured into a polymer network polymer. It is applied to the repair and reinforcement of stone based on several aspects: fast consolidation speed; low viscosity, easy to use and operate; light color, good transparency; high colloid hardness, good polishing; simple preparation and low cost.
1) Unsaturated resin for repairing stone surface
Dilute the unsaturated resin to the appropriate viscosity, or add suitable pigments and powder fillers to repair the holes and cracks on the stone surface. At this time, we use it as a stone surface glue. This type of topcoat is mainly used for the repair of cracks and defects on the surface of marble sheets during the production of factories and the filling of travertine holes. When used, the whole board surface can be completely scraped or partially repaired according to the defects of the board, and then naturally placed to make the colloid solidified and then polished or polished by the device to quickly solidify and then polish and polish.
Based on the above points, it has been a long time to use unsaturated resin for stone repair, and satisfactory results have also been obtained. However, due to the shortcomings of the unsaturated resin itself, it has some physical disadvantages as a stone repairing material: the viscosity and strength of the colloid are poor; the colloidal brittleness is large; the colloid shrinkage rate is large; and the wet heat resistance is poor. The specific performance on the stone is: the crack of the stone surface of the filled and bonded stone is broken when the force is applied; the shrinkage and depression are formed after the solidification of the colloid for filling; the colloid shrinks and cracks in the joint of the stone. As a result, people continue to explore the use of some of the more perfect resin materials for stone repair.
2) Unsaturated resin for stone reinforcement
Some crack-rich and loose materials (mainly marble), especially large-size plates, are prone to breakage and breakage during processing, handling and installation. Therefore, unsaturated resins are also used for the reinforcement of stone. Gluing and backing on the back of stone is a commonly used method used by some stone factories to prevent stone breakage and breakage. When used, the unsaturated resin is formulated into a suitable viscosity, and then applied to the entire back of the stone, or re-adhered. The upper layer of fiber mesh is used for the purpose of reinforcement and support. At this time, we also call this unsaturated resin a stone backing.
Some of the disadvantages of unsaturated resins also make it a problem with stone backing: this type of backing is only applied to the surface of the stone without penetration, and does not strengthen the essence of the stone; it does not It is suitable for the treatment of some low-strength and easily broken stone production sheets; the adhesion between the rubber layer and the stone is poor, and the plate is damaged after peeling; the adhesion between the rubber layer and the stone is poor, the moisture resistance is poor, and the wetness of the stone is in the case It is necessary to tear off the rubber layer, otherwise it will cause the stone to be empty. Comprehensive analysis of these problems, it is not difficult to see that the sheet treated with this reinforcing material only plays a certain role in the factory stage, and at the time of installation, if the layer of rubber is torn off, the breaking rate of the sheet is still very high.
3) Marble glue
When discussing unsaturated resin as a repairing material for stone, it is impossible to talk about marble glue, because this common stone repairing material on the market is also mostly prepared from unsaturated resin. In addition to the disadvantages of unsaturated resins, this marble adhesive has a relatively large degree of consolidation and adhesion strength due to the addition of a large amount of solvent and filler during formulation. Even more frightening is that it is also used by some people to anchor the pendant when the stone curtain wall is installed. Of course, it attracts people to use, in addition to the convenience of use, it is still cheap.
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