CN105801065A - High-strength plastering gypsum and preparation method thereof - Google Patents
High-strength plastering gypsum and preparation method thereof Download PDFInfo
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- CN105801065A CN105801065A CN201610108620.6A CN201610108620A CN105801065A CN 105801065 A CN105801065 A CN 105801065A CN 201610108620 A CN201610108620 A CN 201610108620A CN 105801065 A CN105801065 A CN 105801065A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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Abstract
The invention provides high-strength plastering gypsum which comprises the following components in parts by weight: 35.0-55.0 parts of building gypsum, 43.0-60.0 parts of quartz sand, 1.0-8.0 parts of talc powder, 0.20-0.50 part of tackifier, 0.10-0.50 part of water preserving agent, 0.20-0.60 part of inorganic retarder, 0.02-0.05 part of organic retarder, 0.01-0.05 part of plasticizer and 0.60-1.20 parts of water. In the invention, the components are added while the content is adjusted, and the strength of the plastering gypsum is enhanced through the synergistic effect of the components. The invention also provides a preparation method of the high-strength plastering gypsum. The content of soluble anhydrous gypsum in the building gypsum is eliminated in a quick aging way, and the strength of the plastering gypsum is further improved.
Description
Technical field
The present invention relates to building material technical field, particularly relate to a kind of high intensity plastering gupsum and preparation method thereof.
Background technology
Plastering gupsum is with Gypsum Fibrosum for major gelled material, adds a kind of energy-efficient inner wall of building and ceiling plastering material that sand, certain admixture and specific complex additive are processed into, and it is widely used in the levelling and decoration of interior wall and top board.In modern construction engineering, plastering gupsum mainly substitutes the plastering materials such as cement, lime mortar and clay class mortar, it is adaptable to various bodies of wall.Compared with other motars, plastering gupsum has good workability, mobility and water retention property, good insulation and sound-proofing, suitable fire protecting performance, metope densification is smooth, it is possible to any substrate bonding, can conditioning chamber humidity, and do not limited by thickness, it is the good wall plastering alignment material of a kind of material property, workability and use function, is widely used in industry and civil buildings.
Consumption at Europe plastering gupsum reaches the 50～70% of all amounts of plastering, has nearly 4,000,000 m every year2Plastering gupsum be applied to interior wall and the ceiling of building.Plastering gupsum is at the early-stage but quickly grow in China.The yield of the plastering gupsum of China in 2012, at 2,600,000 tons, is only second to putty, heat insulation cementing and decorative mortar, and especially scratch coat Gypsum Fibrosum rate of increase is more than 100%.The ground such as Beijing, Shanghai, Jiangsu have commonly used plastering gupsum and have replaced cement based plastering material, and the consumption of plastering gupsum in 2014 reaches 3,500,000 tons.
Plastering gupsum is in actual applications it sometimes appear that quality problems such as low, the dry lintings of hollowing, intensity, and odjective cause is as follows:
1) basic unit dries, and absorption speed is fast, causes that plastering gupsum dehydration is fast, and plaster of Paris does not have complete aquation to form dihydrate gypsum crystal；
2) summer temperature is high, and dihydrate gypsum degree of supersaturation is low, and crystal formation speed is slow, and plastering gupsum is long for setting time；
3) job site temperature is high, wind speed is big, the rapid surface drying in plastering gupsum surface；
4) not according to a mix amount of construction speed, staffing decision plastering gupsum, it is continuing with after adding water stirring after the plastering gupsum initial set mixed, causes that coat of plaster does not have intensity；
5) during winter construction, construction environment temperature is low, and plaster of Paris dissolution velocity is slow on the one hand, causes that gypsum speed is slow；After construction, plastering gupsum slurry is endured cold upon hardening on the other hand, and the water in the concrement of plastering gupsum freezes into ice, destroys the structure of solidifying body.
6) along with the raising of building industry level, the appearance of novel wall material, the basic unit's water absorption rate constituted such as air entrained concrete brick, building block etc. is large and fast.
The intensity difference of domestic plastering gupsum is relatively big, produces dry linting sometimes, and even intensity is too low to as brushing architectural decoration coating material and the basic unit pasting rich and varied wallpaper.Low intensive plastering gupsum shovel to be fallen by family's Decorating Project, waste of manpower and time, produces dust and building waste, contaminated environment.
Following factor can affect the intensity of plastering gupsum: the 1) quality of plaster of Paris, including phase composition, granular size, shape and distribution, specific surface area, dopant species and content；2) composition of plastering gupsum, the kind of additive (retarder, water-retaining agent, efficient super plasticizer etc.) and consumption, the granular size of quartz sand, shape, distribution and consumption；3) water consumption etc. of plastering gupsum standard extension degree.
In the market the raw material of plastering gupsum be adopt by natural or desulphurization gypsum calcination prepare based on the plaster of Paris of β-semi-hydrated gypsum.Dihydrate gypsum remaining in plaster of Paris plays the effect of nucleus in the hydration process of plaster of Paris, it is possible to promote the aquation of plaster of Paris, shortens setting time.When the content of dihydrate gypsum is more than 3% in plaster of Paris, the water consumption of plaster of Paris can be increased, the intensity of plastering gupsum is greatly lowered；On the other hand, owing to its setting time is shortened in the existence of dihydrate gypsum, it is necessary to add more retarder to extend the setting time of plaster of Paris, the abundant operating time is provided for its construction.The membership that adds of any retarder more or less reduces the intensity of plaster of Paris.Therefore in the natural or calcination process of desulfurated plaster, it is generally adopted the principle of " peaceful mistake is not owed ", it is to avoid the existence of dihydrate gypsum in plaster of Paris, but brings again a large amount of existence of anhydrous gypsum in plaster of Paris.At present in China's Gypsum Fibrosum industry, due to calcining equipment and calcine technology, the plaster of Paris that reality calcines out often exists certain burning product, i.e. soluble anhydrite, or is called type III anhydrous gypsum.The hydration rate of type III anhydrous gypsum is higher than β-semi-hydrated gypsum, can comprise unhydrated β-semi-hydrated gypsum in the dihydrate gypsum crystal that aquation is formed.Dihydrate gypsum crystal irregular structure, not fine and close.In the later stage of plastering gupsum aquation, water or moisture can form dihydrate gypsum with the β in dihydrate gypsum crystal-semi-hydrated gypsum reaction, and newly-generated dihydrate gypsum crystal destroys the structure of original dihydrate gypsum crystal, thus causing the reduction of plastering gupsum intensity.Through the time nature ageing of a section, type III anhydrous gypsum in plaster of Paris can absorb the moisture in air and naturally be changed into β-semi-hydrated gypsum gradually, the grain shape of plaster of Paris can become regular simultaneously, the water requirement causing plastering gupsum is gradually lowered, comprcssive strength increases to some extent, and the performance of last plaster of Paris not only tends towards stability but also also tends to optimize.
Therefore, different agings generally being adopted to improve the intensity of plastering gupsum, the aging that plaster of Paris is conventional has mechanical ageing method and natural ageing method.The digestion time of machinery ageing method is short, effective.Germany gypsum calcining equipment supply business ClaudiusPeter company releases a kind of device accelerating Gypsum Fibrosum ageing, the basic technology of aging device is to import in a cylindrical ageing cylinder by just burned Gypsum Fibrosum by air-flow, the humidity that digestion tank needs is determined by the phase composition of calcined gypsum, hot-air (about 155 DEG C) with certain humidity provides in digestion tank, the Gypsum Fibrosum powder calcined forms suspended state under the hot air acting having humidity, and can fully react with the moisture in air, under this condition, type III anhydrous gypsum can be rapidly converted into β-semi-hydrated gypsum, and β-semi-hydrated gypsum seldom participates in hydration reaction, and the dihydrate gypsum of underburnt also can at high temperature be changed into β-semi-hydrated gypsum, and then reach the purpose of promoting ageing.First occur at inside the crack of anhydrous gypsum owing to type III anhydrous gypsum is converted into β-semi-hydrated gypsum, and then making the specific surface area of Gypsum Fibrosum powder reduce 22-42%, the phase composition of Gypsum Fibrosum and the change of specific surface area ultimately result in the Gypsum Fibrosum water requirement after ageing and reduce and being greatly improved of intensity.But equipment investment and observable index are higher, for the manufacturer of plastering gupsum, owing to the total output of plastering gupsum is less, the amount using plaster of Paris is little, and it is worthless from output ratio that the equipment of a set of machinery ageing plaster of Paris is built in investment.
Another method is nature ageing method, namely utilizes natural conditions to carry out ageing plaster of Paris.In natural ageing process, the bed of material is piled up can not be too thick, and otherwise air flowing is not smooth, and the moisture in air is insufficient with plaster of Paris effect, it is difficult to make the phase transition process of plaster of Paris tend towards stability.Actually natural ageing is for the manufacturer of plastering gupsum, it is impossible to realize.Although the volume of production of plastering gupsum is little, also there is the plaster of Paris consumption of 100～200 tons every day, and plaster of Paris was at least 10 days in the time of workshop nature ageing, it is therefore desirable to the natural ageing space of nearly 1500 tons, this is that the manufacturer of plastering gupsum cannot accomplish.Process so many dry pulverulent materials simultaneously and can cause airborne dust and environmental pollution, affect the healthy of operator.
Summary of the invention
Present invention solves the technical problem that and be in that to provide plastering gupsum that a kind of intensity is higher and preparation method thereof.
In view of this, this application provides a kind of high intensity plastering gupsum, including:
Preferably, described inorganic retarder is the mixture of tricalcium silicate and dicalcium silicate, and described organic retarder is the calcium salt of amino acid oligomers.
Preferably, described tricalcium silicate is (1～4) with the mass ratio of described dicalcium silicate: 1.
Preferably, in described plaster of Paris, the content of β-semi-hydrated gypsum is more than 30%.
Preferably, the consumption of described water is 0.80～1.0 weight portion.
Preferably, described water-retaining agent is viscosity is the hydroxypropyl methyl cellulose ether of 200～100000mPa.s.
Preferably, the consumption of described inorganic retarder is 0.25～0.45 weight portion.
Preferably, the consumption of described organic retarder is 0.025～0.035 weight portion.
Preferably, the consumption of described water calculates according to formula I and obtains:
W=1.3% × WCaSO4-FWCaSO4×WCaSO4-FWSiO2×WSiO2(Ⅰ)；
Wherein: the amount of water in W-plastering gupsum formula, unit is kg；
WCaSO4The consumption of plaster of Paris in-plastering gupsum formula；Unit is kg；
FWCaSO4Adsorbing the content of water in-plaster of Paris, unit is %；
WSiO2The consumption of quartz sand in-plastering gupsum formula；Unit is kg；
FWSiO2Adsorbing the content of water in-quartz sand, unit is %.
The preparation method that present invention also provides a kind of high intensity plastering gupsum, comprises the following steps:
The water of the quartz sand of 43.0～60.0 weight portions and 0.60～1.20 weight portion is mixed, obtains compound；
The plaster of Paris of described compound and 35.0～55.0 weight portions is mixed, add the plasticiser of the Pulvis Talci of 1.0～8.0 weight portions, the binding agent of 0.20～0.50 weight portion, the water-retaining agent of 0.10～0.50 weight portion, the inorganic retarder of 0.20～0.60 weight portion, organic retarder of 0.02～0.05 weight portion and 0.01～0.05 weight portion, obtain plastering gupsum.
This application provides a kind of high intensity plastering gupsum, it includes the plaster of Paris of 35.0～55.0 weight portions, 43.0 the quartz sand of～60.0 weight portions, the Pulvis Talci of 1.0～8.0 weight portions, the viscosifier of 0.20～0.50 weight portion, the water-retaining agent of 0.10～0.50 weight portion, the inorganic retarder of 0.20～0.60 weight portion, organic retarder of 0.02～0.05 weight portion, the plasticiser of 0.01～0.05 weight portion and the water of 0.60～1.20 weight portion.Adopting organic retarder and inorganic retarder composite in the application plastering gupsum, make plastering gupsum have the slow setting time long, loss of strength is little, even can improve intensity；Water-retaining agent can delay the loss of moisture in plastering gupsum, aquation for β-semi-hydrated gypsum improves sufficient moisture, water-retaining agent is thickening agent simultaneously, add the water consumption of plastering gupsum, the application preferably employs low viscosity cellulose ether as water-retaining agent, both avoid the too fast loss of moisture in plaster leveling layer, decrease again the Micro-v oid gap in screed-coat.Therefore, the application, by carrying out composite to the component of plastering gupsum and content, makes each component synergism, and the intensity finally making plastering gupsum is higher.
Further, the application is in the process of preparation high intensity plastering gupsum, first by water by quartz sand uniform adsorption, then mix with plaster of Paris again, both can guarantee that in plaster of Paris, anhydrous gypsum and water reacted formation β-semi-hydrated gypsum, avoid again owing to the addition of water causes the conglomeration of plaster of Paris, thus improve the intensity of plastering gupsum.
Detailed description of the invention
In order to be further appreciated by the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but it is to be understood that these describe simply as further illustrating the features and advantages of the present invention, rather than limiting to the claimed invention.
The embodiment of the invention discloses a kind of high intensity plastering gupsum, including:
This application provides a kind of high intensity plastering gupsum, it is by adding different components and regulating the content of component, plastering gupsum is made to have good water-retaining property, strong with the cohesive force of various basic units, easy construction, during joint laborsaving, especially the intensity of the plastering gupsum of the present invention is high, greatly ensure that the construction quality of interior decoration plaster leveling.
Plaster of Paris is the major gelled material of plastering gupsum, and the performance of plastering gupsum is played a decisive role.Described plaster of Paris is had no particular limits by the application, for material well known to those skilled in the art.Described plaster of Paris is to be formed by natural gypsum ore deposit or desulphurization gypsum calcination, and wherein the content of β-semi-hydrated gypsum is preferably more than 30%, more preferably more than 45%.The fineness of herein described plaster of Paris can be 30～50 orders, 40～70 orders, 70～90 orders, 100～120 orders and 120～140 orders；The fineness of described plaster of Paris is little, and dissolution velocity is slow, and degree of supersaturation is low, but consumption is little, and the hole in hardenite is few, and namely the intensity of plaster of Paris hardenite is high；If the fineness of plaster of Paris is big, its specific surface area is big, and dissolution velocity is big, and the degree of supersaturation of dihydrate gypsum is big, crystal precipitates out and growth rate is fast, setting time is short, it is possible to produce bigger crystalline stress, big with hourly water consumption, hole in hardenite is many, the intensity of plastering gupsum reduces on the contrary, and therefore, the fineness of described plaster of Paris is preferably 70～90 orders.The consumption of herein described plaster of Paris is 35～55 weight portions, it is preferred to 40～50 weight portions.
The foundation of the intensity of plastering gupsum is mainly realized by the condensation cure of plaster of Paris.The condensation hardening process of plaster of Paris is the forming process of dihydrate gypsum crystal Structure Network, it is necessary to the precipitation of the dissolving of experience semi-hydrated gypsum and the crystallization of aquation and dihydrate gypsum and growth stage.Plaster of Paris condenses hardening quickly, and its presetting period is 4.5～20min, and operable time is short, tends not to meet the construction needs of plastering gupsum, in most cases to add retarder to extend the setting time of plaster of Paris.The retarder of traditional plastering gupsum is organic retarder (such as tartaric acid, sodium tartrate, citric acid, potassium citrate, osseocolla, protein etc.), inorganic retarder (such as slaked lime, sodium hexameta phosphate, sodium polyphosphate, ammonium phosphate etc.).Commercially the retarder of huge number can not be stablized the setting time effectively extending plastering gupsum, greatly reduces again the intensity of plastering gupsum.The present invention uses inorganic retarder and organic retarder compound, and wherein inorganic retarder is preferably the mixture of tricalcium silicate and dicalcium silicate, and organic retarder is preferably the calcium salt of amino acid oligomers.The calcium salt retarding effect of organic retarder amino acid oligomers is excellent and amplitude that the intensity of plastering gupsum is reduced is low, consumption is 0.02～0.05 weight portion.Inorganic retarder not only extends the setting time of plastering gupsum, and improve the intensity of plastering gupsum to some extent, the consumption of inorganic retarder is 0.20～0.60 weight portion, wherein the part by weight of tricalcium silicate and dicalcium silicate is preferably (1～4): 1, more preferably (2～3): 1.
Plasticiser is a kind of when maintenance dry-mixed mortar workability is constant, effectively reduces the additive of mixing water amount.Plasticiser can make plaster of Paris Granular composite, improves workability, reducing water consumption, thus improving the compactness of plastering gupsum material, increasing its mobility.Plasticiser of the present invention is preferably high performance polycarboxylic acid salt's plasticiser, and its consumption is 0.01～0.05 weight portion, more preferably 0.02～0.04 weight portion.
The cohesive force improving plastering gupsum and basic unit is one of important means solving plastering gupsum layer hollowing.Herein described viscosifier can be one or more in re-dispersible glue powder, polyvinyl alcohol, pre-gelatinized starch and polyacrylamide resin, and herein described viscosifier are preferably re-dispersible glue powder；The polymer type of described re-dispersible glue powder is selected from one or more in polyvinyl acetate, pure acrylate, copolymer in cinnamic acrylic ester, vinyl chloride-ethylene copolymer, VAE and vinylacetate-ethylene-vinyl versatate copolymer.The vitrification point of the polymer of described re-dispersible glue powder is preferably-15 DEG C～20 DEG C, more preferably vitrification point is the VAE of 14 DEG C～18 DEG C.The consumption of herein described viscosifier is 0.20～0.50 weight portion, and in an embodiment, the consumption of described viscosifier is preferably 0.30～0.40 weight portion.
The water-retaining property of plastering gupsum is particularly significant, and the plastering gupsum of good water-retaining property is possible not only to effectively to prevent too fast dry and aquation deficiency from causing decrease in strength phenomenon, and operable time is long, batch scrapes smooth and easy, and workability is good.The water-retaining agent being currently used for plastering gupsum is often cellulose ether, such as methyl cellulose ether, ethoxyl methyl cellulose ether and hydroxypropyl methyl cellulose ether etc..Due to the introducing of the non-polar groups such as methyl, cellulose ether has the character of surfactant, and the bubble brought in the process of stirring and construction plastering gupsum is stablized, and improves its application property.Under the effect of cellulose ether, moisture is just gradually released in basic unit or air in the time of an elongated segment, it is ensured that plastering gupsum has sufficiently long time and the hardening of water Step crystallization.When cellulose ether kind is identical, water-retaining property is in close relations with its viscosity, fineness, consumption and dissolubility, herein described water-retaining agent is preferably the hydroxypropyl methyl cellulose ether that viscosity is 200～100000mPa.s, more preferably viscosity is the hydroxypropyl methyl cellulose ether of 200～500mPa.s, to under the premise ensureing the complete aquation of plastering gupsum, reduce the water consumption of plastering gupsum as far as possible, improve the degree of compaction of plastering gupsum screed-coat.The consumption of described water-retaining agent is 0.10～0.50 weight portion, it is preferable that 0.20～0.40 weight portion.
Quartz sand is quartz through the broken quartz particles processed, and is the silicate mineral of a kind of hard, wear-resisting, stable chemical performance.Herein described plastering gupsum adds quartz sand and can improve the hardness and wear resistance of plastering gupsum.The consumption of herein described quartz sand is 43.0～60.0 weight portions, and in certain embodiments, the consumption of described quartz sand is preferably 47～55 weight portions.
Talcous main component is the magnesium silicate that Talcum is moisture, and it has lubricity, resists the excellent Wuli-Shili-Renli system approach such as glutinous, fluidizer, absorption affinity are strong.Herein described talcous consumption is 1.0～8.0 weight portions, and in an embodiment, described talcous consumption is preferably 1.5～6.5 weight portions.
The supplier of current plaster of Paris, in order to prevent in plaster of Paris containing dihydrate gypsum, often burning, therefore often has the existence of the different type III anhydrous gypsum of content in plaster of Paris.For the quality of stable plaster of Paris, the present invention adopts the method for accelerated ageing.The method of so-called accelerated ageing plaster of Paris is exactly add water in the processing step producing plastering gupsum, makes the type III anhydrous gypsum in plaster of Paris react formation β-semi-hydrated gypsum with water, improves the intensity of plastering gupsum.In herein described plastering gupsum, the consumption of water is 0.60～1.20 weight portion, and in an embodiment, the consumption of described water is preferably 0.80～1.10 weight portion.In herein described plastering gupsum, the consumption of water obtains by the following method:
Adopt quartering to reduce sample size in plaster of Paris sample, obtain plaster of Paris sampling；
Adopt quartering to reduce sample size in quartz sand sample, obtain quartz sand sampling；
Measure the water absorption of plaster of Paris and quartz sand；
Formula I is adopted to calculate the addition of water in plastering gupsum；
W=1.3% × WCaSO4-FWCaSO4×WCaSO4-FWSiO2×WSiO2(Ⅰ)；
In formula: the amount of water in W-plastering gupsum formula, unit is kg；
WCaSO4The consumption of plaster of Paris in-plastering gupsum formula；Unit is kg；
FWCaSO4Adsorbing the content of water in-plaster of Paris, unit is %；
WSiO2The consumption of quartz sand in-plastering gupsum formula；Unit is kg；
FWSiO2Adsorbing the content of water in-quartz sand, unit is %.
Concrete, when plaster of Paris incoming test, taking 20kg sample from different parts, adopt quartering to reduce sample size in its natural state, last sampling amount is 200g, loads in the plastic sealing bag that thickness is more than 100 μm and preserves.When quartz sand incoming test, taking 20kg sample from different positions, adopt quartering to reduce sample size in its natural state, last sampling amount is 1200g, loads in the plastic sealing bag that thickness is more than 100 μm and preserves.
The mensuration of the moisture content of the application quartz sand preferably requires to be measured with reference to the regulation of Section 7.18 in standard GB/T/T14684 " construction sand ".
In plaster of Paris, the mensuration of water content measures with reference to national standard " plaster of Paris crystal species analysis method " (paper for approval), namely plaster of Paris sample is weighed, it is laid in weighing botle, add alcoholic solution, make plaster of Paris moistening uniform, place 2 minutes, put in 50 DEG C of air dry ovens and dry to constant weight.
The content of plaster of Paris absorption water is in mass fraction, as following formula calculates:
FWCaSO4=(W1-W2)/W1 × 100%
Wherein, the weight of plaster of Paris sample before W1-addition alcoholic solution, unit is g；
After W2-adds alcoholic solution, and drying is to the weight of the plaster of Paris sample of constant weight, and unit is g；
FWCaSO4=absorption water content in plaster of Paris, unit is %.
Such as FWCaSO4For on the occasion of, it was shown that plaster of Paris does not have type III anhydrous gypsum, containing absorption water；Such as FWCaSO4For negative value, represent in plaster of Paris and do not adsorb water, be that type III anhydrous gypsum is converted into the water that β-semi-hydrated gypsum consumes and accounts for the percentage ratio of plaster of Paris.
In plaster of Paris and quartz sand after moisture determination, then determine the amount of water in plastering gupsum formula accordingly；Content according to plaster of Paris in plastering gupsum, the consumption of quartz sand and the absorption water of the two, calculates for accelerated ageing plaster of Paris amount of water in factory formula in actual production, and calculating formula is such as shown in formula I.
The preparation method that present invention also provides a kind of high intensity plastering gupsum, comprises the following steps:
The water of the quartz sand of 43.0～60.0 weight portions and 0.60～1.20 weight portion is mixed, obtains compound；
The plaster of Paris of described compound and 35.0～55.0 weight portions is mixed, add the plasticiser of the Pulvis Talci of 1.0～8.0 weight portions, the binding agent of 0.20～0.50 weight portion, the water-retaining agent of 0.10～0.50 weight portion, the inorganic retarder of 0.20～0.60 weight portion, organic retarder of 0.02～0.05 weight portion and 0.01～0.05 weight portion, obtain high intensity plastering gupsum.
In order to enable water to fully be adsorbed by quartz sand, in above process, quartz sand is preferably joined in powder lot dispersing still by the application, starts agitator, adds water, makes water be adsorbed completely by quartz sand.Then add plaster of Paris, in order to ensure that plaster of Paris is mixed homogeneously with quartz sand, continue stirring 10～20min.
In the preparation process of plastering gupsum, the application is prepared according to the method described above, by water first by quartz sand uniform adsorption, then mixes with plaster of Paris, both the anhydrous gypsum that can guarantee that in plaster of Paris reacts formation β-semi-hydrated gypsum with water, avoids again owing to the addition of water causes the conglomeration of plaster of Paris.
At the construction field (site), it is 1:(0.20～0.25 with water according to mass ratio by plastering gupsum) mix, obtain plastering gupsum slurry, be coated with and scrape in basic unit, cold curing becomes plastering gupsum screed-coat.
The plastering gupsum of the present invention preferably employs low viscosity cellulose ether, the moisture in plastering gupsum slurry is made not easily to be absorbed by basic unit and evaporate in air, plaster of Paris aquation in plastering gupsum is abundant, do not increase considerably the water consumption in plastering gupsum work progress simultaneously, increase the degree of compaction of plaster leveling layer；Preferably employing the mixture of alkaline-earth metal calcium salt as retarder, can effectively extend the setting time of plastering gupsum, only small amplitude reduction even increases the intensity of plastering gupsum；Inorganic/that organic composite retarder has the slow setting time is long, and loss of strength is little, even improves intensity.Therefore, the plastering gupsum of the application, by adding said components and content being defined, various component synergism, makes the plastering gupsum of the present invention have intensity height, constant product quality, solves plastering gupsum dry linting in construction, comes off and problems of crack.
Further, the application is quick precipitation plaster of Paris in plastering gupsum, and plaster of Paris and quartz sand are carried out moisture content analysis, is advisable for 1.1～1.5 with the free water content that plaster of Paris is final, calculates the water consumption needed in plastering gupsum formula；To plaster of Paris accelerated ageing, stabilizing the quality of plaster of Paris, the cohesive force making plastering gupsum and basic unit is strong, and the intensity of itself is high, it is ensured that the quality of indoor decorating engineering and attractive in appearance.
The setting time of plastering gupsum prepared by the present invention, comprcssive strength, rupture strength, adhesion strength are tested according to the regulation of standard GB/T/T28627-2012 " plastering gupsum ".Result represents, high intensity plastering gupsum intensity of the present invention is high, strong with the cohesive force of basic unit, and pressure-proof and snap-resistent intensity is high, and properties meets the regulation requirement of scratch coat Gypsum Fibrosum in standard GB/T/T28627-2012 " plastering gupsum ".
In order to be further appreciated by the present invention, below in conjunction with embodiment, high intensity plastering gupsum provided by the invention and preparation method thereof being described in detail, protection scope of the present invention is not limited by the following examples.
Raw material in following example is the water content of commercially available prod, plaster of Paris and quartz sand and obtains according to the content calculating of above-mentioned literature record.
Embodiment 1
In the plaster of Paris that the present embodiment uses, anhydrous gypsum mass fraction is 12.81%, and semi-hydrated gypsum mass fraction is 45.61%, and the mass fraction of absorption water is-0.87%；In quartz sand, moisture is 0.25%, then in 1000 weight portion plastering gupsums should amount of water be:
W=450 × 1.3%-470 × 0.25%-450 × (-0.87%)=8.6 weight portions.
The preparation process of plastering gupsum particularly as follows:
(1) 470 weight portion quartz sands are joined in powder lot dispersing still, start agitator, add the water of 8.6 weight portions, make water be evenly distributed in quartz sand；
(2) under agitation, in above-mentioned powder lot dispersing still, add 450 weight portion plaster of Paris, plaster of Paris is mixed homogeneously with quartz sand, keep 15 minutes；
(3) under agitation, 62.2 weight portion Pulvis Talci, 3.0 weight portion viscosifier, 3.0 weight portion water-retaining agent, the tricalcium silicate of 1.80 weight portions, the dicalcium silicate of 0.90 weight portion and the organic retarder of calcium salt of 0.30 weight portion amino acid oligomers, 0.20 weight portion superplasticizer is added in above-mentioned powder lot dispersing still, mix and blend, obtains plastering gupsum.
Job site, is that 1:0.22 mix with water according to mass ratio by plastering gupsum, obtains plastering gupsum slurry, be coated with and scrape in basic unit, drying at room temperature becomes plaster leveling layer.
Comparative example 1 does not add water, tricalcium silicate and dicalcium silicate, amount of talc is 73.5 weight portions, and all the other various raw-material consumptions remain unchanged, and standard diffusion degree water consumption is 23%.
Add water in comparative example 2 8.6 weight portions, and amount of talc is 64.9 weight portions, is not added with tricalcium silicate and dicalcium silicate, and all the other various raw-material consumptions remain unchanged, and standard diffusion degree water consumption is 22%.Comparative example 1 and the preparation method of comparative example 2 plastering gupsum are identical with embodiment 1.
The present embodiment and comparative example 1, the component of comparative example 2 plastering gupsum and content are as shown in table 1.
Table 1 embodiment 1 and comparative example component and content data table (by weight)
The physical property of the plastering gupsum of the present embodiment meets every technology requirement of scratch coat Gypsum Fibrosum in GB GB/T28627-2012, and performance data is as shown in table 2.
The main performance tables of data of table 2 plastering gupsum
| Sequence number | Detection project | Standard value | Comparative example 1 | Comparative example 2 | Embodiment 1 |
| 1 | Presetting period, min | ≥60 | 240 | 230 | 350 |
| 2 | Final setting time, min | ≤480 | 245 | 235 | 355 |
| 3 | Comprcssive strength, MPa | ≥4.0 | 6.0 | 7.1 | 7.5 |
| 4 | Rupture strength, MPa | ≥2.0 | 3.5 | 3.6 | 3.7 |
| 5 | Adhesion strength, MPa | ≥0.4 | 0.6 | 0.9 | 0.9 |
After implementing the accelerated ageing of plaster of Paris, plastering gupsum performance has raising by a relatively large margin.Plastering gupsum in comparative example 2 is compared with comparative example 1, and comprcssive strength improves 18.3%, and adhesion strength improves 50%.Anhydrous gypsum content in Gypsum Fibrosum of building after accelerated ageing reduces, and plaster of Paris particle surface regularity improves, and shows that the water consumption of the standard diffusion degree of plastering gupsum reduces.
Plastering gupsum in embodiment 1 is compared with comparative example 1, and comprcssive strength improves 25.0%, and adhesion strength improves 50%, and the water consumption of the standard diffusion degree of plastering gupsum reduces.Using the calcium salt of tricalcium silicate, dicalcium silicate and amino acid oligomers as retarder, the amplitude that extends setting time is obvious, and comparative example 1 compares, and setting time extends 42%.The prolongation of setting time is to construction worker's more operating time, but intensity no matter with comparative example 1 or and comparative example 2 more all have increase in various degree, the addition of tricalcium silicate and dicalcium silicate is described, extends the setting time of plastering gupsum, and intensity has increased slightly.If plastering gupsum is close for setting time, the calcium salt of use tricalcium silicate, dicalcium silicate and amino acid oligomers has increase by a larger margin as the intensity of the plastering gupsum of retarder.
Embodiment 2
In the plaster of Paris that the present embodiment uses, anhydrous gypsum mass fraction is 25.27%, and semi-hydrated gypsum mass fraction is 33.06%, and the mass fraction of absorption water is-1.71%；In quartz sand, moisture is 0.26%, then in 1000 weight portion plastering gupsums should amount of water be:
W=360 × 1.3%-560 × 0.26%-360 × (-1.71%)=9.4 weight portions.
The preparation process of the present embodiment plastering gupsum particularly as follows:
(1) 560 weight portion quartz sands are joined in powder lot dispersing still, start agitator, add the water of 9.4 weight portions, make water be evenly distributed in quartz sand；
(2) under agitation, adding 360 weight portion plaster of Paris in powder lot dispersing still, plaster of Paris is mixed homogeneously with quartz sand, keeps 12 minutes；
(3) under agitation, 62.0 weight portion Pulvis Talci, 3.0 weight portion viscosifier, 2.0 weight portion water-retaining agent, 2.25 weight portion tricalcium silicates, 0.75 weight portion dicalcium silicate and the calcium salt of 0.40 weight portion retarder amino acid oligomers, 0.20 weight portion superplasticizer is added in powder lot dispersing still, mix and blend, obtains plastering gupsum.
Job site, is that 1:0.21 mix with water according to mass ratio by plastering gupsum, obtains plastering gupsum slurry, be coated with and scrape in basic unit, drying at room temperature becomes plaster leveling layer.
Comparative example 3 does not add water, tricalcium silicate and dicalcium silicate, amount of talc is 74.4 weight portions, and all the other various raw-material consumptions remain unchanged, and standard diffusion degree water consumption is 23%.
Add water in comparative example 4 9.4 weight portions, and amount of talc is 65.0 weight portions, is not added with tricalcium silicate and dicalcium silicate, and all the other various raw-material consumptions remain unchanged, and standard diffusion degree water consumption is 21%.Comparative example 3 is identical with the preparation method of the preparation method of comparative example 4 plastering gupsum Yu embodiment 2 plastering gupsum.
Embodiment 2 and comparative example 3, the component of the plastering gupsum of comparative example 4 and content are as shown in table 3.
The constituent content tables of data (by weight) of the plastering gupsum that table 3 embodiment 2, comparative example 3 provide with comparative example 3
The physical property of the plastering gupsum of the present embodiment meets every technology requirement of scratch coat Gypsum Fibrosum in GB GB/T28627-2012, as shown in table 4.
The main performance tables of data of table 4 plastering gupsum
| Sequence number | Detection project | Standard value | Comparative example 3 | Comparative example 4 | Embodiment 2 |
| 1 | Presetting period, min | ≥60 | 345 | 320 | 650 |
| 2 | Final setting time, min | ≤480 | 350 | 325 | 655 |
| 3 | Comprcssive strength, MPa | ≥4.0 | 6.3 | 8.2 | 8.3 |
| 4 | Rupture strength, MPa | ≥2.0 | 3.5 | 4.2 | 4.1 |
| 5 | Adhesion strength, MPa | ≥0.4 | 0.6 | 0.8 | 0.9 |
Plastering gupsum in comparative example 4 is compared with comparative example 3, and performance has raising by a relatively large margin, and as comprcssive strength improves 30.2%, rupture strength improves 20.0%, and adhesion strength improves 33.3%.After implementing accelerated ageing, the anhydrous gypsum content in plaster of Paris reduces, and plaster of Paris granule is improved by regularity, shows that the water consumption of the standard diffusion degree of plastering gupsum reduces.Accelerated ageing process is understood some anhydrous gypsum or semi-hydrated gypsum is converted into dihydrate gypsum, show that the setting time of plastering gupsum shortens.
Plastering gupsum in embodiment 2 is compared with comparative example 4, and performance has raising by a relatively large margin, and as comprcssive strength improves 31.7%, adhesion strength improves 50%, and the water consumption of the standard diffusion degree of plastering gupsum reduces.Using the calcium salt of tricalcium silicate, dicalcium silicate and amino acid oligomers as retarder, the amplitude that extends setting time is obvious, and comparative example 3 compares, and setting time extends 88.4%.The prolongation of setting time is to construction worker's more operating time, but no matter intensity more all has increase in various degree with comparative example 3 or comparative example 4, the addition of tricalcium silicate and dicalcium silicate is described, extends the setting time of plastering gupsum, and intensity has increased slightly.
Embodiment 3
In the plaster of Paris that the present embodiment uses, anhydrous gypsum mass fraction is 9.6%, and semi-hydrated gypsum mass fraction is 54.55%, and the mass fraction of absorption water is-0.90%；In quartz sand, moisture is 0.25%, then in 100 weight portion plastering gupsums should amount of water be:
W=520 × 1.3%-440 × 0.25%-520 × (-0.90%)=10.3 weight portions.
The preparation method of the present embodiment plastering gupsum particularly as follows:
(1) 440 weight portion quartz sands are joined in powder lot dispersing still, start agitator, add the water of 10.3 weight portions, make water be evenly distributed in quartz sand；
(2) under agitation, adding 520 weight portion plaster of Paris in powder lot dispersing still, plaster of Paris is mixed homogeneously with quartz sand, keeps 18 minutes；
(3) under agitation, the organic retarder of calcium salt of 18.9 weight portion Pulvis Talci, 3.0 weight portion viscosifier, 3.5 weight portion water-retaining agent, 2.73 weight portion tricalcium silicates, 1.10 weight portion dicalcium silicates and 0.27 weight portion amino acid oligomers, 0.20 weight portion superplasticizer is added in powder lot dispersing still, mix and blend, obtains plastering gupsum.
Job site, is that 1:0.22 mix with water according to mass ratio by plastering gupsum, obtains plastering gupsum slurry, be coated with and scrape in basic unit, drying at room temperature becomes plaster leveling layer.
Comparative example 5 does not add water, tricalcium silicate and dicalcium silicate, amount of talc is 33.03 weight portions, and all the other various raw-material consumptions remain unchanged, and standard diffusion degree water consumption is 24%.
Add water in comparative example 6 10.3 weight portions, and amount of talc is 22.73 weight portions, is not added with tricalcium silicate and dicalcium silicate, and all the other various raw-material consumptions remain unchanged, and standard diffusion degree water consumption is 22%.Comparative example 5 is identical with embodiment 3 with the preparation method of comparative example 6 plastering gupsum.
Embodiment 3 and comparative example 5, the component of the plastering gupsum of comparative example 6 and content are as shown in table 5.
The component tables of data (by weight) of the plastering gupsum of table 5 embodiment 3, comparative example 5 and comparative example 5
The physical property of the plastering gupsum of the present embodiment meets every technology requirement of scratch coat Gypsum Fibrosum in GB GB/T28627-2012, as shown in table 6.
The main performance tables of data of table 6 plastering gupsum
| Sequence number | Detection project | Standard value | Comparative example 5 | Comparative example 6 | Embodiment 3 |
| 1 | Presetting period, min | ≥60 | 350 | 300 | 490 |
| 2 | Final setting time, min | ≤480 | 355 | 305 | 495 |
| 3 | Comprcssive strength, MPa | ≥4.0 | 11.0 | 13.4 | 14.1 |
| 4 | Rupture strength, MPa | ≥2.0 | 5.3 | 6.5 | 7.5 |
| 5 | Adhesion strength, MPa | ≥0.4 | 0.5 | 0.6 | 0.8 |
Plastering gupsum in comparative example 6 is compared with comparative example 5, and performance has raising by a relatively large margin, and as comprcssive strength improves 21.8%, rupture strength improves 22.6%, and adhesion strength improves 20.0%.After implementing accelerated ageing, the anhydrous gypsum content in plaster of Paris reduces, and plaster of Paris granule is improved by regularity, shows that the water consumption of the standard diffusion degree of plastering gupsum reduces.Accelerated ageing process is understood some anhydrous gypsum or semi-hydrated gypsum is converted into dihydrate gypsum, show that the setting time of plastering gupsum shortens.
Plastering gupsum in embodiment 3 is compared with comparative example 5, and performance has raising by a relatively large margin, and as comprcssive strength improves 28.1%, adhesion strength improves 60%, and the water consumption of the standard diffusion degree of plastering gupsum reduces.Using the calcium salt of tricalcium silicate, dicalcium silicate and amino acid oligomers as retarder, the amplitude that extends setting time is obvious, and comparative example 5 compares, and setting time extends 40.0%.The prolongation of setting time is to construction worker's more operating time, but intensity no matter with comparative example 5 or and comparative example 6 more all have increase in various degree, the addition of tricalcium silicate and dicalcium silicate is described, extends the setting time of plastering gupsum, and intensity has increased slightly.
The explanation of above example is only intended to help to understand method and the core concept thereof of the present invention.It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention carries out some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a high intensity plastering gupsum, including:
2. high intensity plastering gupsum according to claim 1, it is characterised in that described inorganic retarder is the mixture of tricalcium silicate and dicalcium silicate, described organic retarder is the calcium salt of amino acid oligomers.
3. high intensity plastering gupsum according to claim 2, it is characterised in that the mass ratio of described tricalcium silicate and described dicalcium silicate is (1～4): 1.
4. plastering gupsum according to claim 1, it is characterised in that in described plaster of Paris, the content of β-semi-hydrated gypsum is more than 30%.
5. high intensity plastering gupsum according to claim 1, it is characterised in that the consumption of described water is 0.80～1.1 weight portion.
6. high intensity plastering gupsum according to claim 1, it is characterised in that described water-retaining agent is viscosity is the hydroxypropyl methyl cellulose ether of 200～100000mPa.s.
7. high intensity plastering gupsum according to claim 1, it is characterised in that the consumption of described inorganic retarder is 0.25～0.45 weight portion.
8. high intensity plastering gupsum according to claim 1, it is characterised in that the consumption of described organic retarder is 0.025～0.035 weight portion.
9. high intensity plastering gupsum according to claim 1, it is characterised in that the consumption of described water calculates according to formula I and obtains:
W=1.3% × WCaSO4-FWCaSO4×WCaSO4-FWSiO2×WSiO2(Ⅰ)；
Wherein: the amount of water in W-plastering gupsum formula, unit is kg；
WCaSO4The consumption of plaster of Paris in-plastering gupsum formula；Unit is kg；
FWCaSO4Adsorbing the content of water in-plaster of Paris, unit is %；
WSiO2The consumption of quartz sand in-plastering gupsum formula；Unit is kg；
FWSiO2Adsorbing the content of water in-quartz sand, unit is %.
10. a preparation method for high intensity plastering gupsum, comprises the following steps:
The water of the quartz sand of 43.0～60.0 weight portions and 0.60～1.20 weight portion is mixed, obtains compound；
The plaster of Paris of described compound and 35.0～55.0 weight portions is mixed, add the plasticiser of the Pulvis Talci of 1.0～8.0 weight portions, the binding agent of 0.20～0.50 weight portion, the water-retaining agent of 0.10～0.50 weight portion, the inorganic retarder of 0.20～0.60 weight portion, organic retarder of 0.02～0.05 weight portion and 0.01～0.05 weight portion, obtain high intensity plastering gupsum.
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| CN111995343A (en) * | 2020-08-24 | 2020-11-27 | 湖南小树科技发展有限公司 | High-strength water-resistant plastering gypsum |
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