“Abstract
Exterior real stone paint makes painters love and hate it, love its simple formula, easy to produce, and can provide output and production value to paint enterprises; hate its high complaint rate, high rework cost, varying quality of colored sand, tense supply, and difficult to adjust the color. This paper is to try different technical paths to develop a product with better decorative and protective properties to replace the external wall of the real stone paint, to reduce the pain points and shortcomings of the current external wall of the real stone paint involution and low carbon policy products exist.
Keywords: hair flower, low carbon, lightweight real stone paint, new technology process, liquid colored sand
01
Preface
Exterior real stone paint, because of its appearance as natural as natural stone, natural, stable, grand, decorative, cost-effective, now is still the developers to improve the short-term profits of the mainstream products.
With incomplete statistics, although the current architectural coatings market downturn, the market volume of real stone paint still has a compound growth of 4-5%, is still the core product of each paint factory to improve production capacity and output value.
“Bidding to have a bottom line, the lowest bidder to come in for what ah? Will he give you dry at a loss? Will certainly cut corners or is to reduce the quality of the product to work on.
We all know that the cost of the formula of real stone paint consists of four major components: emulsion, color sand, film-forming additives and thickeners. Usually the formula cost, emulsion accounted for about 45-50%, color sand accounted for about 35-40%, film-forming additives and thickening agent each accounted for about 7-9% or so. You launched today 2.8 yuan / kg of real stone paint, I will tomorrow 2.6 yuan / kg to the market, there is no minimum, only lower, competition and involution to a white-hot degree.
Enterprises in order to make a profit, the boss or professional managers called engineers and procurement to find ways to reduce costs, as engineers first of all in the formulation of the high cost of stone paint materials to start, the first and foremost is the emulsion. Engineers to the amount of emulsion from the initial 18% down to about 10% now, more bold directly to the emulsion waist, reduced to 7-9%, emulsion quality from pure C silicon down to phenylpropylene, phenylpropylene plus PVA, phenylpropylene plus silicone sol.
Procurement to emulsion manufacturers to reduce prices, emulsion manufacturers in order to capture the market and moderate profits, emulsion performance is also from high performance to low performance, solid content from about 48% to about 40%, JG/T24-2018 “Synthetic Resin Emulsion Sand-like Architectural Coatings” standard, although there is no mandatory requirement for the softness of the real stone paint, but the majority of paint manufacturers still have the technical requirements in this regard, in the non-increase of emulsion, to achieve the softness of the stone paint. Increase the case of emulsion, to achieve the requirements of softness, emulsion manufacturers will reduce the Tg value of the emulsion, reduce the Tg value is usually more butyl acrylate to adjust its glass transition temperature, so as to balance the bond strength and softness of the two relationships, softness is good, the emulsion’s water absorption will be slightly larger, and the two-way run to a dead end.
Imagine a real stone paint manufacturers to reduce the emulsion content down, emulsion manufacturers to reduce the solids content, how much emulsion actually stay on the real stone paint?
We all know that the paint is good or bad with the paint itself PVC has a very big relationship, when the paint CPVC (CPVC = 1/1 + ∑ {(OA.ρ.v/93.5} with the same PVC is in the critical volume concentration, the paint formula is relatively cost-effective; when the PVC is greater than the CPVC, there will be part of the formula of the pigmented filler is not wrapped up by the emulsion or resin, when subjected to rain and sunlight, the pigmented filler that is not wrapped up will not be wrapped up, and will not be wrapped up after irradiation. When irradiated by rain and sunlight, the pigmented filler that is not wrapped will be swollen and taken away by the rain, leaving voids and rain marks, accelerating the chalking and lightening of the coating film, and the coating life and decorative greatly reduced, so that the formula is strictly only applicable to the interior decorative system.
Exterior real stone paint is a kind of composite coating, generally consists of bottom coating, main coating and top coating. Primer coating is used to close or penetrate the reinforced substrate, prevent alkali salinity, enhance the adhesion of the main coating and substrate, as well as reduce the water absorption rate of the grass-roots level caused by the stone paint show color varies, such as flower; surface coating is mainly used for the main coating, play a role in enhancing the overall protection and improve the decorative effect. The reality is that, because the cover layer is often caused by the construction of non-standard problems caused by a large area of bloom, so that many of the real stone paint in the actual construction of the default cover, and ultimately leave the quality of the real stone paint coatings for the quality of the hidden problems, such as rain marks bloom, color lightening and other quality problems.
In this, the problem is the biggest pain point of the real stone paint, I have been in the “real stone paint flowers that” in more detail to explain its logical relationship, both its formula and production problems, but also its construction of the coating supporting the problem.
For example, real stone paint joints hair flower, both real stone paint formula (such as table dry fast, color sand particle size ratio is unreasonable, poor fusion, coarse sand is easy to splash), but also spray construction without effective construction management (such as oblique spraying, no construction of lap joints to deal with the construction and shielding anti-splash, etc.).
If the emulsion is the flesh and blood of the exterior real stone paint, then the colored sand is the formation of the skeleton of the real stone paint.
In the environment of gold and silver mountains, not as good as green water and green mountains, limiting the mining of mountain rocks, the supply is tight. At the same time, also because of the different colored sand sources, resulting in uneven quality of colored sand used in real stone paint (such as hue, composition, metal oxides, particle size distribution, water absorption rate, etc.). Some enterprises in order to alleviate the problem of tense supply of color and color sand for real stone paint, and at the same time take into account the competitors to set the color threshold, usually use some homemade calcined sand and dyed sand. This type of colored sand because of its calcination process, the void becomes larger or the lattice is broken ring, its water absorption rate becomes obviously larger, theoretically need more latex particles or resin to wrap, otherwise it is prone to quality problems.
Some people will ask, we real stone paint original with 12 points nothing, why not now, before we talked about the relationship between PVC and CPVC, when PVC = CPVC is in the resin or latex completely wrapped pigment filler, so that there is no gap between the particles of the pigment filler, is a relatively perfect coating film, but when the OA (i.e., pigment filler) used in the quality of a certain amount, but the amount of oil absorption and water absorption rate However, when the quality of OA (i.e. pigment filler) used is certain, but the oil absorption and water absorption rate change, the CPVC changes, the larger the OA, the more resin and latex particles need to be wrapped up accordingly, otherwise the coating film will not be dense, resulting in part of the pores, and the water and aging resistance will be geometrically deteriorated.
But the real stone paint in the actual operation of very few people to pay attention to the logical relationship between the two, colored sand or calcined sand into the factory is estimated that no one has never been to pay attention to the quality of its problems (such as the main components of colored sand, particle size distribution, water absorption, metal oxide content, etc.).
I do not know whether you have found in practice, with the same real stone paint slurry and colored sand graded in accordance with a certain ratio (such as 250:750) of the preparation of the real stone paint, white snow white overall real stone paint viscosity is low, and even need to make up for the thickening agent, with the same number of mesh, with the same weight of the new green gray colored sand to replace the snow white preparation of the real stone paint viscosity will be higher, if you want to achieve the appropriate construction viscosity If you want to achieve a suitable construction viscosity, you need to add additional slurry or water, this is because the new green ash colored sand water absorption rate is large, in the actual production of real stone paint slurry to add, the chances of problems will be small, if the water to add the chances of problems will be relatively much larger.
In the past, the stone paint emulsion additive high, and through the cover paint, the color sand has a very good wrapping, can effectively avoid the stone paint coating, easy to appear water absorption rate, rain marks and stain-resistant poor problem. Now the production of real stone paint coating enterprises in order to reduce the cost of real stone paint emulsion down, the quality of colored sand does not give control, but also due to the construction of non-standard or other reasons, caused by the phenomenon of real stone paint after masking flowers become serious, resulting in the construction of the project can not be acceptance of the construction is completed and delivery, for this reason, most of the exterior real stone paint project projects are not masking or masking paint with a large amount of water to cope with the masking of the ears and turn into the emperor’s new clothes. The emperor’s new clothes.
Another example, usually the real stone paint PVC is greater than CPVC, generally through the cover paint to make up for the PVC is greater than the CPVC there are many quality risks, if the real stone paint construction after the cover, in the actual production, the real stone paint formula is not changed, but some kind of colored sand water absorption and oil absorption, resulting in a batch of production out of the real stone paint PVC is far greater than CPVC, due to the PVC of the paint film is far greater than the CPVC, due to the The PVC of the paint film is much larger than the CPVC, its aging resistance becomes relatively worse, and the water absorption of the coating also becomes relatively large, when the paint film through the rainwater infiltration, after many times back and forth flushing, the hydrophilic substances in the coating or not wrapped up in the powder is taken out, leaving pores, so that the color of the paint film formed by the stone paint becomes lighter and flower.
■ Poor durability, short life cycle, the long duration of the project has not had time to accept delivery, the front construction of the wall appeared all kinds of dirty.
■ Construction is not standardized, resulting in a variety of tug-of-war phenomenon.
■ rework, maintenance costs are high (in the entire exterior stone paint project material costs accounted for about 60% -70%, labor costs accounted for about 30-40%).
All of the above problems have left an extremely bad impression on consumers.2022 October, the State Council formally included “sand and gravel” in the “carbon peak ten actions”, to promote the sand and gravel industry green high-quality development put forward clear requirements.
The Ministry of Ecology and Environment in the first quarter of 2022 issued a total of 17 national policies on the construction industry to reduce carbon and consumption also put forward clear new requirements, on the one hand, to reduce the use of resources, energy; on the one hand, to ensure that the industry high-quality delivery. So is there a product that can solve the many problems that exist in the exterior stone paint, but also to enhance the decorative, durable and meet the 3060 dual-carbon policy under the social responsibility to reduce carbon and emissions, to the industry to bring a new wave of “spring story” – “low-carbon light color stone! Low-carbon light-colored stone”.
“Low-carbon light-colored stone” innovative ideas and concepts
Low-carbon light colored stone is a kind of composite coating, which consists of sand-containing alkali resistant primer paint + low-carbon light colored stone main coating + high hardness super stain-resistant matte cover paint. The main coating of low carbon light colored stone is “liquid colored sand” prepared by the technical path of colorful water-in-sand, to realize the solution of low carbon light colored stone replacing the current real stone paint on the external wall. Achieve rich color, easy color mixing, small batch differences, prepared particles round, full texture with layers, high fusion, good viscoelasticity, not easy to fly sand, no obvious traces of joints, no phenomenon such as hair flower, high simulation, more with the decorative effect of natural stone.
■ “Low-carbon light color stone” program four innovative value:
A. Energy saving and consumption reduction:
a. De-colored sand:
Compared with the large amount of natural colored sand used in traditional real stone paint, all of them adopt fine white sand or snow white, which optimizes the cost and avoids the problem of difficult to adjust the color of real stone paint.
b.Avoid supply risk:
Using the principle of water-in-sand colorful, restore the color of colored sand, the color is richer and more realistic, broaden the source of raw materials and reduce the damage to natural resources. It not only reduces the consumption of resources, but also reduces the supply risk caused by the shortage of natural colored sand raw materials.
B. Light weight and safety
a.Low dosage:
The dosage per square meter is only one-third of the traditional real stone paint, which greatly reduces the construction energy consumption, transportation energy consumption and storage energy consumption, and brings higher cost-effective and sustainable development to the enterprise.
b.Strong texture, real stone:
Program-specific emulsion, providing a color point of super cohesion, prepared as a “liquid color sand”, to achieve a more natural sense of integration, color is richer, so that the coating returns to the original strong texture and lychee surface natural stone-like decorative effect.
C. Convenient construction:
a.High viscoelasticity, not easy to fly sand:
In the formula design, not only optimize the grading of the sand type, at the same time, the sand is effectively wrapped, giving it a certain viscoelasticity, not easy to fly sand, in the material end to reduce the risk of its easy to send flowers, in the actual application of the construction greatly reduces the difficulty of construction.
b. Safe and fast delivery: strong covering power, the construction speed compared to the real stone paint to be twice as fast, effectively shorten the construction period; table drying slow, fast drying, not easy to produce joints, reduce the difficulty of delivery, and effectively help the project fast construction, to ensure that punctual, efficient delivery.
D. Long-lasting beautiful:
Long life, high decoration:
Translated with www.DeepL.com/Translator (free version)
