Protective agent selection principle: For the selection of what kind of protective agent, we should adhere to four specific principles: the specific stone, the specific installation method, the specific pollution source to be prevented and the specific protective agent.
(1) Concrete Stones: First, confirm the type of stone, examine its color (dark, light, black, white, etc.), appearance (glossy, matte side) and the texture of the stone itself (marble or granite), iron-containing Quantity, intensity, sulfur, and other magazines;
(2) The specific installation method should be divided according to the specific circumstances such as dry hanging and wet laying;
(3) Specific sources of pollution to be prevented: Consideration may be given to prevention of backwash of cement slurry, prevention of acid rain during use, prevention of daily water pollution or prevention of oil contamination;
(4) Select a specific protective agent: According to the consideration of the above three factors, determine the specific protective agent, choose water-based, solvent-based, decorative, ground type, special type protective agent.
The specific selection method can be summarized as follows:
1 Smooth stone (especially glossy marble) should try to use protective agent that can increase the gloss of stone.
2 If the decorative effect requires deepening the color of the stone, the brightening type protective agent should be used.
3 The primary color protective agent should be used in the place where the original appearance of the stone is to be maintained.
4 When using wet mounting, the underside of the stone should be used with a protective agent that does not affect the fastness of stone and cement mortar.
5 When considering environmental protection requirements (especially in confined space construction), water-based or organic solvent-free protective agents should be used as far as possible.
(6) Permeate oil-proof type or sealant type protective agent should be used where oil is often exposed.
7 Reinforced stone with low mechanical strength should use enhanced protection agent.
8 The optimum construction temperature of the protective agent is 5-35°C. When the ambient temperature is too low, the water-based protective agent may not be able to be constructed due to icing. At this time, an oil-based or solvent-based protective agent should be selected.
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