Species and the development of stone conservation agent
The first curing agent a wax, is only the surface conservation dense wax film, blocking water or oil intrusion, stone conservation role to play. But the stone pores paraffin completely blocked, preventing stone breathability. Gathered in the moisture inside the stone can not be excluded, resulting in stone disease, and damage from another angle on the stone conservation.
Paraffin film easily contaminated, forming wax scale, easy to clean; paraffin film volatile, easy to wear, often waxing needs, labor-intensive. If waxing frequency increased, it will darken the stone surface, resulting in damage to the stone surface. Paraffin Conservation confined to the ground, not to mention high-altitude operations to conserve the building facade. Paraffin is therefore referred to as "temporary" curing agent.
2nd generation curing agent a colorless impermeable coating can be divided into series and series with a pigment, which is formed in the surface of the stone conservation dense film with paraffin and compared with good stain resistance, long use life and a wider range of use, is a "permanent" curing agent.
Despite the good performance of this waterproof layer, it can block external contamination, but poor ventilation, the moisture inside the stone is difficult to rule out, easily lead to stone disease. Coating the surface of the film will change the style of the stone surface: UV aging resistance and poor durability. Easy to wear, often to be repaired; due to the use of volatile solvents, flammable, toxic, during construction could result in bodily injury or environmental pollution, and therefore not an ideal building curing agent.
3rd generation of a permeable coating curing agent, which is based on the principle of conservation of penetration of the stone, is formed in the surface layer and the internal curing membrane pore surface curing composition, both to prevent the entry of excellent variety of pollutants, not high-impact stone permeability, moisture retention can be avoided inside the stone caused by stone disease; dust and pollution can only float on the stone surface, easy to clean, scrub with water. UV resistance, aging resistance and durability over the second generation of the curing agent is better.
But conservation is the surface of a film, to varying degrees, will have some hiding power, may change the surface of the building original style and features, limiting the application in rich texture, color colorful Ishimura. Such curing agents are solvent-based and water-based emulsion, three. Basically formed a curing agent different from other building paint or coating unique properties.
4th generation of the curing agent, a curing agent is impregnated, a solid content of 10 to 30% of the liquid containing the third generation is completely different from the permeability of the paint, the conservation principle is to use its strong osmotic effect, is not conservation the surface was formed, by the internal pores penetrate the conservation of matter, forming nanoscale spherical crystal conservation layer, both to prevent the entry of multiple pollutants brilliantly, without affecting the permeability of the stone, the stone house completely avoid the moisture retention caused by stone disease; dust and pollution can only float on the surface of the stone. Easy to clean, scrub with water.
It has excellent UV resistance, aging resistance and durability, so that the curing time is longer, up to 30 - 50 years. Because of the non-film forming surface is conservation, conservation was not to be hiding, does not change the surface of the building original style and features. This curing agent can be divided into solvent-based, water emulsion type two.
Internationally popular 5th generation products that are environmentally friendly impregnation curing agent, and 4th generation products, compared it to follow environmental and health and epidemic prevention requirements, more attention to the impact on the surrounding environment. It has a simple construction conservation, non-flammable, safe to use around small stone discoloration coefficient and other characteristics. Reached both conservation is the conservation of the original material, without creating new pollution realm, for the conservation of the environment adds a new way, which is called "Green Building curing agent" in the true sense. Formed from other paint or coating, with unique properties building curing agent.
This curing agent can be divided into solvent-based, aqueous emulsion type and other types. Water emulsion and its non-toxic non-combustible performance gain the trust of users: but solvent-based products, in conformity with the relevant environmental standards, the use of low volatile solvent, with good permeability and construction environmental adaptability, not surfactants, UV resistance, aging resistance and durability stronger, but also water emulsion products difficult par.