CN114262535A - Green environment-friendly lasting mildew-proof weakly-alkaline putty and preparation method thereof - Google Patents
Green environment-friendly lasting mildew-proof weakly-alkaline putty and preparation method thereof Download PDFInfo
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- CN114262535A CN114262535A CN202210041732.XA CN202210041732A CN114262535A CN 114262535 A CN114262535 A CN 114262535A CN 202210041732 A CN202210041732 A CN 202210041732A CN 114262535 A CN114262535 A CN 114262535A
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- 239000002994 raw material Substances 0.000 claims abstract description 17
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 9
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Images
Abstract
The invention provides a green environment-friendly lasting mildew-proof weakly alkaline putty, which is prepared from the following raw materials: 65 to 100 parts by weight of a filler; 0-30 parts of inorganic cementing material; 0.3-5 parts by weight of organic cementing material; 0.2 to 1 weight part of thickening agent; 0-1 part by weight of a wetting agent; 0-20 parts of a pH regulator; 0.02 to 1 weight part of mildew preventive; 0.05-0.5 part by weight of thixotropic lubricant; the filler is selected from one or more of white powder, quartz powder and talcum powder; the fineness of the filler is 200-400 meshes. Compared with the prior art, the environment-friendly lasting mildew-proof alkalescent putty provided by the invention adopts components with specific contents, realizes better interaction, not only can have good mildew-proof effect in a low-alkalinity environment, but also can greatly reduce the dosage of a mildew-proof agent, improve the environment-friendly safety performance of the putty, improve the construction performance of the putty and greatly reduce the cost of the putty.
Description
Technical Field
The invention relates to the technical field of environment-friendly mildew-proof putty, in particular to environment-friendly lasting mildew-proof weakly alkaline putty and a preparation method thereof.
Background
The putty is used as a building auxiliary material and mainly matched with a building coating main material for use, and the putty is required to be used for repairing and leveling the foundation of a wall surface or a ceiling before almost all building coatings are coated, so that the yield of the putty and the future development trend can be estimated by analyzing the yield of the building coatings and the development trend of the industry.
The construction of the indoor putty is generally divided into two batches of scraping, the average thickness is about 1mm, the specification of most putty products in the current market shows that the dosage of the ordinary putty is 1 kilogram per square meter, the dosage of the cement-based water-resistant putty is 1.1 kilogram per square meter, although the indoor application of the ordinary putty in a dry area in the north is still dominant, the outdoor putty is basically all the cement-based putty, the dosage of the cement-based water-resistant putty in coastal areas in the south and wet areas in the south is very large, the ordinary putty and the water-resistant putty are weighted, and the dosage of the unit area of the indoor and outdoor building putty is 1.05 kilogram per square meter. Assuming that all the building paint construction bottom is provided with matched building putty auxiliary materials, the application ratio of the using amount of the building paint to the using amount of the building putty is 0.42: 1.05 ═ 1: 2.5. according to the proportion, 715 million tons of the building coating in 2020 correspond to 1787.5 million tons of putty, and the yield of the putty in 2020 is increased by 1.4 percent compared with 1763.87 million tons of premixed mortar in 2019 in China.
Putty, particularly indoor putty products, as an interior decoration and finishing material, the environmental protection performance of the putty has attracted more and more general attention of consumers and industries, but in the face of numerous certifications, identifications and evaluations related to product environmental protection, common consumers are in fact all the time adequacy, and based on the situation, the opinion on establishment of a unified green product standard, certification and identification system requires establishment of a unified green product evaluation standard and a certification and identification system, and products closely related to eating, wearing, living and going of the consumers are preferably selected to establish the green product evaluation standard. GB/T35602-2017 "Green product appraisal coating" standard is listed in the first product standard of this release, because also put forward relevant green index and requirement to putty in the standard, the environmental protection requirement of this standard has a better guide to the technical development of putty product.
According to the standard requirements of GB/T35602-2017 'Green product evaluation coating', the raw materials of the putty are strictly limited, particularly, the selection of the preservative is few, the mixing amount of the inorganic preservative is required to be higher, and the requirements on the raw materials are higher.
The water-resistant putty with larger using amount usually uses cement or gray calcium as a cementing material to be put into the putty for use, due to the higher alkalinity of the putty, the pH value is about 12, workers are often corroded by cement or ash calcium to the skin during operation, moreover, although the putty has better water resistance, the paint for painting the wall surface causes great trouble when the putty is kept at the pH value of more than 12 for a long time, particularly the paint for the inner wall, because the requirement on the environment protection of the interior wall coating is higher, the used emulsion is mostly intolerant to high-alkali environment, the emulsion of the interior wall coating is easy to react in the high-alkali environment to cause that the coating and a putty layer can not be well combined, which happens occasionally, especially for colored coating, when the paint is coated on high-alkali putty, the paint often appears, so that the pigment of the paint is not uniformly dispersed, and the integral aesthetic effect of the paint is influenced. And the putty using the cement lime as the calcium is hard to polish and level in the actual operation process of workers due to the high hardness of the hardened putty, and the conditions of fixed polishing, uneven polishing and the like are often fed back.
Therefore, in the home decoration process, most of home decoration workers can select common putty, and the pH value of the putty is close to neutral, so that the putty does not corrode the skin. In addition, the paint has wide adaptability to the paint, and the paint-blooming effect of the high-alkalinity putty can not be caused. The putty powder mainly adopts the redispersible latex powder to improve the bonding strength, has high bonding strength, does not hollowly bulge and fall off, and does not crack and fall off due to later shrinkage similar to cement-based putty.
Most of the putty has no mildew-proof function, few mildew-proof putty is available on the market, the mildew-proof putty can achieve less true environmental protection, the mildew-proof effect of most of the putty can be failed quickly, most of the mildew-proof putty on the market at present plays the mildew-proof effect by adding organic and inorganic mildew-proof agents, and most of the mildew-proof agents are not poor in acid-base stability and durability.
The mildew is an important factor for damaging the wall, and the putty mildew not only seriously affects the beauty of the wall surface, but also can breed a large number of pathogenic bacteria and even affect the service life of the wall body of a house. Indoor mold growth is mainly related to factors such as temperature, humidity, acidity and alkalinity, nutrient materials, colony types and initial quantity.
In conclusion, the long-lasting environment-friendly mildew-proof putty is developed, and the technical problem that people are puzzled by wall mildew for a long time and need to be solved by technical personnel in the field is solved; however, the price of the mildew-proof putty is too expensive and difficult to popularize due to the large consumption of the building materials, so that the price of the mildew-proof putty is also one of important factors influencing the popularization of the mildew-proof putty in large quantity.
In view of the above technical problems, the prior art provides some solutions, including:
the patent CN112280360A provides a benzene-free mildew-proof putty for interior walls, the mildew-proof mechanism of the putty is mainly that the pH environment is improved by calcium ash to inhibit the growth and the propagation of mildew, the prepared mildew-proof agent is liquid, is not easy to add in powder, is easy to cause powder agglomeration and the like, the stirring time is additionally increased, the production efficiency is reduced, and the putty is not suitable for large-scale production and use; the added piperidyl hexamethylene diamine has larger pungent smell.
Patent CN104031457A provides a formaldehyde-free putty paste, which is prepared by pre-producing traditional powdery putty in a factory to form paste-like putty, and the putty paste does not achieve good hydrophobic effect after being applied to a wall; after a period of time, the calcium hydroxide in the putty paste is carbonized, and the pH value of a putty layer of the putty paste is reduced to about 8, so that the putty paste is more suitable for growth of mold.
The patent CN103173057A provides a silver ion tourmaline mildew-proof putty and a manufacturing method thereof, silver ion or silver ion mildew-proof glue powder is mainly used for killing mildew by adding a large amount of silver ion substances, and the mode is mainly used for killing the mildew by increasing the using amount of a mildew inhibitor so as to prevent the growth of the mildew; however, the price of the silver ion preservative is higher, so that the production cost of the putty is greatly increased, and the mildew-proof putty is not beneficial to being widely popularized; meanwhile, tourmaline, namely tourmaline is added, mineral resources are few, the price is high, most of tourmaline has colors which are not beneficial to an indoor putty pure white system, the decoration surface is decorated in the later period, the decoration paint is difficult to cover, the color difference is generated, and the integral attractiveness of the paint is influenced.
The patent CN103436072A provides a green environment-friendly high-strength mildew-proof putty powder, which mainly adds alkenyl succinic acid starch ester and additionally adds nutrient substances of a mildew agent; the substance is liquid, is not easy to add in the powder processing process, and the produced powder is easy to agglomerate and the like; the main method is to use calcium hydroxide introduced by the self as a high pH regulator to reduce the growth of mould; the patent self-tells about the mildew-proof putty, but the patent has no mildew-proof experimental data, and the mildew-proof effect can be seen.
Patent CN105754399A provides a mildew-proof putty powder and a preparation method thereof, wherein a method for adjusting the pH value is selected, or gray calcium is added, and the powder needs to be heated at high temperature, so that large-scale production is difficult to achieve for general manufacturers, the applicability of the mildew-proof putty powder needs to be studied, and related mildew-proof effects are not mentioned in the patent, so that the mildew-proof effect is not ideal.
The patent CN111349356A provides interior wall putty with a mildew-proof function and a preparation method thereof, wherein the selection is to increase the pH value, and use strong alkaline substances such as cement, ash calcium and the like, which are easy to corrode skin, are easy to be incompatible with paint, and are easy to have risks such as hollowing and cracking in the later period; the water repellent selected in the patent is magnesium stearate, sodium stearate organic silicon water repellent and water repellent, the solubility is low, the water repellent is not easy to be uniformly dispersed among particles, and the dosage for achieving the water repellent effect is large; the mildew preventive used in the patent is inorganic barium metaborate, titanium dioxide and nano zinc oxide, has high activity and can decompose the coating on the upper layer; after the defoaming agent is added into the putty, the viscosity of the putty is increased, the anti-sagging performance is reduced, the defoaming agent is added, the gas content in the slurry is reduced, the scraping resistance is increased, and the use intention of workers is reduced; under high alkaline environment, many organic mildewcides cannot exist for a long time or reduce the mildewproof effect.
Summarizing the technical schemes disclosed in the prior patents and documents, all the used water repellent and preservative or the mildew-proof function adopted in the high-alkaline environment, the technical scheme of the mildew-proof putty has the advantages of great environmental protection performance, low production cost, difficulty in large-scale production and poor compatibility with a veneer layer; in addition, most of the organic mildew preventive agents have a certain mildew preventive function in a high-alkali environment, most of the organic mildew preventive agents cannot be matched with the organic mildew preventive agents in the high-alkali environment, only inorganic mildew preventive agents can be used, and heavy metal poisoning can be caused due to the fact that the using amount of many inorganic mildew preventive agents is too large.
Disclosure of Invention
In view of the above, the invention aims to provide the environment-friendly lasting mildew-proof weakly alkaline putty and the preparation method thereof.
The invention provides a green environment-friendly lasting mildew-proof weakly alkaline putty, which is prepared from the following raw materials:
65 to 100 parts by weight of a filler;
0-30 parts of inorganic cementing material;
0.3-5 parts by weight of organic cementing material;
0.2 to 1 weight part of thickening agent;
0-1 part by weight of a wetting agent;
0-20 parts of a pH regulator;
0.02 to 1 weight part of mildew preventive;
0.05-0.5 part by weight of thixotropic lubricant;
the filler is selected from one or more of white powder, quartz powder and talcum powder; the fineness of the filler is 200-400 meshes.
Preferably, the inorganic gelling material is selected from one or more of building gypsum, high strength gypsum and anhydrite.
Preferably, the organic gelling material is selected from one or more of butylbenzene, acrylic, vinyl acetate ethylene, polyvinyl alcohol and modified starch.
Preferably, the thickener is selected from one or more of methyl hydroxyethyl cellulose ether, methyl hydroxypropyl cellulose ether, hydroxyethyl cellulose ether and the like.
Preferably, the wetting agent is selected from sodium oleate and/or potassium oleate.
Preferably, the pH regulator is selected from one or more of calcium silicate powder, zeolite powder and hydrotalcite powder;
the fineness of the pH regulator is 180-800 meshes.
Preferably, the mildew preventive is selected from one or more of organic mildew preventive, inorganic salt mildew preventive and natural mildew preventive.
Preferably, the thixotropic lubricant is a starch ether and/or bentonite.
The invention also provides a preparation method of the environment-friendly lasting mildew-proof weakly alkaline putty, which comprises the following steps:
a) premixing the mildew preventive, the wetting agent and the pH regulator to obtain a prefabricated mildew preventive;
b) mixing the prefabricated mildew preventive obtained in the step a), the inorganic cementing material and 50 wt% of filler in a stirrer for 30-60 s, adding the organic cementing material, the thickening agent and the thixotropic lubricant in a stirring state, adding the rest filler in the stirrer after the material is added, and continuously stirring for 60-120 s to obtain the environment-friendly durable mildew-proof weakly-alkaline putty.
Preferably, the rotating speed of the stirring in the step b) is 100 r/min-300 r/min.
The invention provides a green environment-friendly lasting mildew-proof weakly alkaline putty, which is prepared from the following raw materials: 65 to 100 parts by weight of a filler; 0-30 parts of inorganic cementing material; 0.3-5 parts by weight of organic cementing material; 0.2 to 1 weight part of thickening agent; 0-1 part by weight of a wetting agent; 0-20 parts of a pH regulator; 0.02 to 1 weight part of mildew preventive; 0.05-0.5 part by weight of thixotropic lubricant; the filler is selected from one or more of white powder, quartz powder and talcum powder; the fineness of the filler is 200-400 meshes. Compared with the prior art, the environment-friendly lasting mildew-proof alkalescent putty provided by the invention adopts components with specific contents, realizes better interaction, not only can have good mildew-proof effect in a low-alkalinity environment, but also can greatly reduce the dosage of a mildew-proof agent, improve the environment-friendly safety performance of the putty, improve the construction performance of the putty and greatly reduce the cost of the putty.
In addition, the preparation method provided by the invention is simple, mild in condition, easy to control, low in production cost, easy to carry out industrial large-scale production and wide in application prospect.
Drawings
FIGS. 1 to 12 are graphs showing the results of the tests for the mildew resistance of No. 1 to No. 12;
FIG. 13 is a graph showing the effect of # 5 having a wetting hydrophobe;
fig. 14 is a graph showing the effect of no wetting water repellent in # 8.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a green environment-friendly lasting mildew-proof weakly alkaline putty, which is prepared from the following raw materials:
65 to 100 parts by weight of a filler;
0-30 parts of inorganic cementing material;
0.3-5 parts by weight of organic cementing material;
0.2 to 1 weight part of thickening agent;
0-1 part by weight of a wetting agent;
0-20 parts of a pH regulator;
0.02 to 1 weight part of mildew preventive;
0.05-0.5 part by weight of thixotropic lubricant;
the filler is selected from one or more of white powder, quartz powder and talcum powder; the fineness of the filler is 200-400 meshes.
The invention provides environment-friendly long-term mildew-proof low-alkali putty, and the growth of indoor mildew is mainly related to factors such as temperature, humidity, acidity and alkalinity, nutrient materials, colony types and initial quantity. In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty is prepared from raw materials including a filler, an inorganic gel material, an organic gel material, a thickening agent, a wetting agent, a pH regulator, a mildew-proof agent and a thixotropic lubricant, and is preferably prepared from the filler, the inorganic gel material, the organic gel material, the thickening agent, the wetting agent, the pH regulator, the mildew-proof agent and the thixotropic lubricant.
In the invention, the filler is preferably selected from one or more of white powder (taking calcium carbonate as a main component), quartz powder and talcum powder, and more preferably is the white powder, the combination of the white powder and the talcum powder, or the quartz powder. The source of the filler in the present invention is not particularly limited, and commercially available products known to those skilled in the art may be used. In the present invention, the fineness of the filler is preferably 200 to 400 mesh.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 65-100 parts by weight of filler, such as 65 parts by weight, 75 parts by weight, 80 parts by weight, 85 parts by weight, 95 parts by weight and 100 parts by weight.
In the present invention, the inorganic gelling material is preferably selected from one or more of building gypsum, high strength gypsum (anhydrite) and anhydrite, more preferably building gypsum or high strength gypsum (anhydrite). The source of the inorganic gelling material is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0-30 parts by weight of inorganic cementing material, and when the weight part is 0, the inorganic cementing material is not added, preferably 15-25 parts by weight.
In the invention, the organic cementing material is preferably selected from one or more of butylbenzene, acrylic acid, vinyl acetate ethylene, polyvinyl alcohol and modified starch (cassava, corn, potato and the like), and specifically is formed by mixing one or more of acrylic acid, butylbenzene, vinyl acetate, modified starch and the like in dispersed emulsion powder; the present invention is not particularly limited in its origin, and commercially available products known to those skilled in the art may be used. In a preferred embodiment of the present invention, the organic gelling material is VAE latex powder; in another preferred embodiment of the invention, the organic gelling material is VAE latex powder and cassava modified starch; in another preferred embodiment of the invention, the organic cementing material is styrene-butadiene rubber powder, styrene-acrylic rubber powder and cassava modified starch.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0.3-5 parts by weight of organic cementing material, preferably 1.5-2.5 parts by weight.
In the present invention, the thickener is preferably selected from one or more of methyl hydroxyethyl cellulose ether, methyl hydroxypropyl cellulose ether, hydroxyethyl cellulose ether and the like, more preferably methyl hydroxyethyl cellulose ether; the thickener has water retention effect. The source of the thickener in the present invention is not particularly limited, and commercially available products well known to those skilled in the art may be used.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0.2 to 1 weight part of thickener, preferably 0.5 weight part.
In the present invention, the wetting agent is preferably selected from sodium oleate and/or potassium oleate; the present invention is not particularly limited in its source, and commercially available products of monovalent metal salts of the above-mentioned higher fatty acids well known to those skilled in the art may be used. The putty powder can be quickly wetted by the wetting agent, the stirring time of the putty powder is reduced, the labor is saved, and the problem that the conventional putty powder is easy to agglomerate due to field stirring and the putty batch scraping effect is influenced due to the uniform stirred putty slurry is solved; the wetting agent selected by the invention can react with calcium ions to generate a hydrophobic substance, so that the compactness of the putty layer is improved, the water content of the putty layer is obviously reduced, and the breeding of mould is effectively reduced.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0-1 part by weight of wetting agent, and when the part by weight is 0, the wetting agent is not added, and 0.2 part by weight is preferred.
In the present invention, the pH regulator is preferably selected from one or more of a calcium silicate powder, a zeolite powder and a hydrotalcite powder, and more preferably the calcium silicate powder and/or the zeolite powder; the pH value of the pH regulator in nature is 9.5-10.5. The source of the pH adjuster is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the present invention, the fineness of the pH adjuster is preferably 180 to 800 mesh, and more preferably 325 to 800 mesh. According to the invention, natural inorganic alkalescent mineral powder is doped, so that a putty layer is in an alkalescent environment for a long time, and the breeding of mould is effectively prevented; meanwhile, the pH value of the natural alkalescent mineral is kept lasting and stable, and the influence of the environment is small.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0-20 parts by weight of pH regulator, and when the weight part is 0, the pH regulator is not added, preferably 5-10 parts by weight.
In the present invention, the mildewcide is preferably selected from one or more of organic mildewcides such as iodopropynyl butyl carbamate (IPBC), Zinc Pyrithione (ZPT), inorganic-based mildewcides including ammonium persulfate, boron ions, calcium phosphate, zinc ions, silver ions, copper ion compounds, etc., inorganic-based mildewcides including mustard extract, mugwort, etc.; more preferably an organic fungicide. The source of the fungicide is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In a preferred embodiment of the present invention, the mildewcide is iodopropynyl butyl carbamate (IPBC); in another preferred embodiment of the present invention, the mildewcide is Zinc Pyrithione (ZPT); in another preferred embodiment of the present invention, the mildewcide is iodopropynyl butyl carbamate (IPBC) and Zinc Pyrithione (ZPT). The specific type of the mildew preventive doped in the invention is strictly selected according to the relevant standards of building materials, the doping amount range is greatly reduced, the production cost of the mildew preventive putty can be greatly reduced, the putty is favorable for being widely popularized, the problem that people are troubled by mildew for a long time is solved, and the living environment of people is improved.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0.02-1 part by weight of mildew preventive, preferably 0.03-0.09 part by weight.
In the present invention, the thixotropic lubricant is preferably a starch ether and/or bentonite, and more preferably a starch ether. The source of the thixotropic lubricant is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used.
In the invention, the green environment-friendly lasting mildew-proof weakly alkaline putty comprises 0.05-0.5 part by weight of thixotropic lubricant, preferably 0.1-0.4 part by weight.
The invention firstly carries out specific selection on raw materials, comprising the following steps: (1) the selection of the water repellent adopts a water repellent substance generated by the reaction of a wetting agent and calcium ions in a system to replace the traditional method of directly adding the water repellent; (2) a long-term effective pH regulator is selected, natural inorganic minerals are adopted, the pH regulator is natural and environment-friendly, and harmful substances such as VOC are not introduced; (3) the selection of the mildew preventive reduces the dosage of the environment-friendly mildew preventive, and the mildew preventive is large in addition amount, not environment-friendly, uneconomical and small in addition amount and does not work; (4) the wetting agent is selected, a surfactant which is easy to dissolve in water is adopted, the surfactant can react with calcium ions to produce a water-insoluble substance, sodium oleate is a good surfactant, powder particles can be fully wetted, and meanwhile, calcium oleate precipitates with oleic acid radicals and the calcium ions, so that the surface is more compact, and the water absorption is reduced; and the calcium oleate can react with water vapor in the air to produce combined water, so that the free water in the putty is reduced. Furthermore, the proportion of inorganic cementing materials, fillers, organic cementing materials, thickening agents, wetting agents, mildew inhibitors, thixotropic lubricants and inorganic natural alkalescent pH mineral powder is optimized, so that the obtained putty powder is easy to produce, the mildew inhibitors are low in using amount and lasting in mildew resistance, meanwhile, the leveling putty powder is easy to cover, the putty powder is easy to construct, water is added for stirring, the putty powder is easy to disperse, the putty powder is environment-friendly, and the contents of VOC, benzene series and formaldehyde in the putty powder are low; experimental results show that the VOC content of the environment-friendly lasting mildew-proof weakly alkaline putty is lower than 1g/kg, benzene series is lower than 5mg/kg,the formaldehyde content is lower than 5mg/kg, and the heavy metal content is far lower than 20 mg/kg; meanwhile, the release amount of VOC (volatile organic compound) of the putty in 3 days is TVOC (total volatile organic compound), and the test result is 8 mu g/m3And the TVOC test result at 7 days is 5 mug/m3The TVOC test result at 28 days was 3. mu.g/m3(ii) a In addition, the putty powder is scraped by 1mm in thickness in a single pass, the drying time is 20min, the scraping thickness is 2mm, the drying time is 40min, and the 7-day bonding strength is 1.08 MPa.
The invention also provides a preparation method of the environment-friendly lasting mildew-proof weakly alkaline putty, which comprises the following steps:
a) premixing the mildew preventive, the wetting agent and the pH regulator to obtain a prefabricated mildew preventive;
b) mixing the prefabricated mildew preventive obtained in the step a), the inorganic cementing material and 50 wt% of filler in a stirrer for 30-60 s, adding the organic cementing material, the thickening agent and the thixotropic lubricant in a stirring state, adding the rest filler in the stirrer after the material is added, and continuously stirring for 60-120 s to obtain the environment-friendly durable mildew-proof weakly-alkaline putty.
The invention firstly mixes the mildew preventive, the wetting agent and the pH regulator to obtain the prefabricated mildew preventive. In the present invention, the mildew preventive, the wetting agent and the pH regulator are the same as those in the above technical solution, and are not described herein again. The process of premixing is not particularly limited in the present invention, and mechanical stirring techniques well known to those skilled in the art may be used.
After the prefabricated mildew preventive is obtained, the obtained prefabricated mildew preventive, the inorganic cementing material and 50 wt% of filler are mixed in a stirrer for 30-60 s, preferably 40-50 s, the organic cementing material, the thickening agent and the thixotropic lubricant are added in a stirring state, after the materials are added, the rest filler is added in the stirrer, and the mixture is continuously stirred for 60-120 s, preferably 80-100 s, so that the environment-friendly durable mildew-proof weakly alkaline putty is obtained.
In the present invention, the rotation speed of the stirring is preferably 100 to 300r/min, and the stirring is always maintained.
The preparation method provided by the invention is simple, mild in condition, easy to control, low in production cost, easy to carry out industrial large-scale production and wide in application prospect.
At present, aiming at the technical problem of how to achieve the hydrophobicity of the putty, the traditional hydrophobing agents such as organic silicon and the like are added, so that the raw material cost is high, the mass production is not suitable, and meanwhile, the common hydrophobing agents are not compatible with water and have poor dispersion effect; the invention fully wraps the surfaces of the particles through the wetting agent in the early stage, and then slowly interacts with calcium ions in the slurry to generate a water repellent with good hydrophobicity; the wetting agent can quickly disperse powder, prevent the powder from agglomerating, shorten the stirring time and reduce the stirring energy consumption.
Aiming at mildew resistance, when the pH value of the mould is more than 9, the propagation is obviously reduced; the invention adopts inorganic natural alkalescent mineral, the pH adjustment and maintenance time is long, and the performance is stable; the mildew preventive can quickly kill the mildew and cut off breeding spots from the source, but the environment-friendly mildew preventive is high in cost and large in dosage and is not suitable for being added in a large amount.
The putty layer can be in a weak alkaline environment for a long time, so that the mildew-proof condition of the putty layer is solved, the dosage of the mildew-proof agent in the mildew-proof putty is reduced, and the cost of the mildew-proof agent is reduced by about 40%; the invention greatly improves the construction performance of the mildew-proof putty, and the construction is more labor-saving. In addition, the invention is easy for large-scale production, and the product has rich raw materials and is easy for production.
The invention provides a green environment-friendly lasting mildew-proof weakly alkaline putty, which is prepared from the following raw materials: 65 to 100 parts by weight of a filler; 0-30 parts of inorganic cementing material; 0.3-5 parts by weight of organic cementing material; 0.2 to 1 weight part of thickening agent; 0-1 part by weight of a wetting agent; 0-20 parts of a pH regulator; 0.02 to 1 weight part of mildew preventive; 0.05-0.5 part by weight of thixotropic lubricant; the filler is selected from one or more of white powder, quartz powder and talcum powder; the fineness of the filler is 200-400 meshes. Compared with the prior art, the environment-friendly lasting mildew-proof alkalescent putty provided by the invention adopts components with specific contents, realizes better interaction, and can well prevent mildew in a low-alkaline environmentThe putty has the advantages of greatly reducing the dosage of the mildew preventive, improving the environmental protection safety performance of the putty, improving the construction performance of the putty and greatly reducing the cost of the putty. Experimental results show that the environment-friendly lasting mildew-proof alkalescent putty is safe and environment-friendly, is really environment-friendly, and has the VOC content of less than 1g/kg, the formaldehyde content of less than 10mg/kg and the heavy metal content of less than 50 mg/kg; TVOC result of 3 days of the invention 8 mug/m3TVOC result at 7 days 5. mu.g/m3TVOC result at 28 days 3. mu.g/m3The test method is tested according to the GREENGUARD certification planning method of UL 2821' using a dynamic environmental chamber to measure and evaluate the chemical emissions of building materials, veneers and furniture; the water absorption of the putty is reduced by more than 50 percent, the unit area of the universal putty absorbs 0.4ml of water, and the unit area of the putty absorbs 0.2ml of water.
In addition, the preparation method provided by the invention is simple, mild in condition, easy to control, low in production cost, easy to carry out industrial large-scale production and wide in application prospect.
To further illustrate the present invention, the following examples are provided for illustration. The raw materials used in the following examples of the present invention are all commercially available products; wherein the fineness of the whiting is 250 meshes, the fineness of the talcum powder is 400 meshes, and the fineness of the quartz powder is 200 meshes.
Examples
Referring to table 1, table 1 is a composition table of the raw materials of the examples of the present invention in parts by weight.
TABLE 1 composition of the raw materials in parts by weight of the inventive examples
The preparation method comprises the following steps:
referring to a raw material composition table of table 1, a mildew preventive, a wetting agent and a pH regulator are premixed to obtain a prefabricated mildew preventive;
adding half of the filler and all the inorganic gelled materials into a mixing stirrer (the rotating speed is maintained at 200r/min), mixing for 45s, and then adding the organic gelled materials, the thickening agent and the starch ether for continuous mixing; after the raw materials are added, adding the rest filler into a mixing stirrer, and continuously stirring for 90s to obtain a uniform mixture, namely the environment-friendly durable mildew-proof weakly alkaline putty.
The green environment-friendly lasting mildew-proof weakly alkaline putty provided by the embodiment of the invention is tested for various performances; wherein the mildew resistance is determined according to GB/T1741-2007 method for testing the mildew resistance of paint films, and the specific mildew resistance test method comprises the following steps: testing each sample to make 3 parallel samples, and simultaneously testing 3 blank samples to compare; and adding 37% of water into the mildew-proof putty powder, uniformly stirring, uniformly coating on a test piece, then placing the test piece on an aseptic curing room, curing for 7 days, and carrying out mildew-proof challenge test.
Grading:
grade 0-no significant growth at about 50 times magnification;
grade 1 — no or very difficult growth to see with the naked eye, but growth was evident under a magnifying glass (< 10%);
grade 2-the growth is obviously seen by naked eyes, and the coverage area on the surface of the sample is 10% -30%;
grade 3-the growth is obviously seen by naked eyes, and the coverage area on the surface of the sample is 30-60%;
grade 4-growth is evident to the naked eye with coverage of greater than 60% on the sample surface.
Specific test results are shown in fig. 1 to 12, where fig. 1 is level 0, fig. 2 is level 2, fig. 3 is level 1, fig. 4 is level 1, fig. 5 is level 0, fig. 6 is level 1, fig. 7 is level 1, fig. 8 is level 2, fig. 9 is level 2, fig. 10 is level 0, fig. 11 is level 1, and fig. 12 is level 1.
The results are shown in Table 2.
Table 2 various performance data of the green, environmentally friendly, durable, mildewproof, weakly alkaline putty provided in the embodiments of the present invention
Through hundreds of verification, the physical properties of the environment-friendly durable mildew-proof low-alkali putty provided by the invention can meet the requirements of the indoor putty for JG/T298-containing 2010 buildings, the VOC content is less than 1g/kg, the formaldehyde content is less than 5mg/kg, and the heavy metal content is less than 50 mg/kg; meanwhile, the TVOC release amount of 3 days is 8 mug/m tested according to the GREENGUARD certification plan method of UL 2821 using dynamic environmental chamber to measure and evaluate the chemical emission of building materials, veneers and furniture3And a TVOC release amount of 5 μ g/m for 7 days3And TVOC release amount at 28 days is 3 mug/m3。
Through a mildew-proof challenge experiment and construction performance evaluation, the construction batches of No. 1, No. 5 and No. 10 are smooth and smooth, and the mildew-proof grade is 0 grade, so that the product with the wetting water repellent and the alkalescent inorganic pH regulator is fully explained, the mixing amount of the mildew-proof agent can be greatly reduced, the mildew-proof effect of the putty can be greatly increased, the construction performance of the putty is greatly improved through the introduction of a wetting agent, the cost of the mildew-proof agent is low, and the efficiency is high; and simultaneously testing the pH value of the putty layer after being placed for 6 months and the pH value after 7 days, wherein the pH value after 7 days is 10.05, and the pH value after 6 months is 10.04.
The wetting agent has obvious effect, produces hydrophobic substances after the reaction process, fills gaps, reduces surface tension, reduces the water enrichment effect, and has the advantages that the water absorption rate is tested by a Karster tube after 7 days of No. 5 and No. 8, the 5# unit area absorbs 0.2mL, the 8# unit area absorbs 0.4mL, and the absorption rate is reduced by 50%, which is shown in figures 13-14.
The cost of the mildew preventive is reduced by about 40 percent: 300 yuan/kg of mildew preventive, 15 yuan/kg of wetting agent, 0.5 yuan/kg of inorganic pH regulator, the dosage of the mildew preventive which is used alone and has the mildew preventive effect is more than 0.08 percent, while the dosage of the mildew preventive of the invention is 0.04 percent, the dosage of 300 multiplied by 0.8 is 240 yuan, the dosage of the mildew preventive of the invention is 300 multiplied by 0.4+15 multiplied by 2+50 multiplied by 0.5 is 175 yuan, and the cost is saved (240 plus 175)/175 equals 42.8 percent).
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The environment-friendly lasting mildew-proof weakly alkaline putty is prepared from the following raw materials:
65 to 100 parts by weight of a filler;
0-30 parts of inorganic cementing material;
0.3-5 parts by weight of organic cementing material;
0.2 to 1 weight part of thickening agent;
0-1 part by weight of a wetting agent;
0-20 parts of a pH regulator;
0.02 to 1 weight part of mildew preventive;
0.05-0.5 part by weight of thixotropic lubricant;
the filler is selected from one or more of white powder, quartz powder and talcum powder; the fineness of the filler is 200-400 meshes.
2. The environment-friendly, durable, mold-proof, weakly basic putty as claimed in claim 1 wherein the inorganic cementitious material is selected from one or more of building gypsum, high strength gypsum and anhydrite.
3. The environment-friendly, durable, mold-proof, weakly alkaline putty as claimed in claim 1, characterised in that the organic gelling material is selected from one or more of butylbenzene, acrylic, vinyl acetate ethylene, polyvinyl alcohol, modified starch.
4. The green environment-friendly durable mildewproof weakly basic putty as claimed in claim 1, wherein the thickening agent is selected from one or more of methyl hydroxyethyl cellulose ether, methyl hydroxypropyl cellulose ether, hydroxyethyl cellulose ether and the like.
5. The green environmentally friendly permanent mold proof weakly basic putty as claimed in claim 1 characterised in that the wetting agent is selected from sodium oleate and/or potassium oleate.
6. The environment-friendly, lasting, mildew-proof and weakly alkaline putty as claimed in claim 1, characterized in that the pH regulator is selected from one or more of calcium silicate powder, zeolite powder and hydrotalcite powder;
the fineness of the pH regulator is 180-800 meshes.
7. The environment-friendly durable mildewproof weakly alkaline putty as claimed in claim 1, wherein the mildewproof agent is one or more selected from organic mildewproof agents, inorganic salt mildewproof agents and natural mildewproof agents.
8. The green, environmentally friendly, long-lasting, mold-proof, weakly basic putty as claimed in claim 1, wherein said thixotropic lubricant is starch ether and/or bentonite.
9. A preparation method of the green environment-friendly, lasting, mildew-proof and weakly alkaline putty as defined in any one of claims 1-8, which comprises the following steps:
a) premixing the mildew preventive, the wetting agent and the pH regulator to obtain a prefabricated mildew preventive;
b) mixing the prefabricated mildew preventive obtained in the step a), the inorganic cementing material and 50 wt% of filler in a stirrer for 30-60 s, adding the organic cementing material, the thickening agent and the thixotropic lubricant in a stirring state, adding the rest filler in the stirrer after the material is added, and continuously stirring for 60-120 s to obtain the environment-friendly durable mildew-proof weakly-alkaline putty.
10. The method according to claim 9, wherein the rotation speed of the stirring in step b) is 100 to 300 r/min.
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