Gypsum enhancer

Gypsum reinforcing agent
According to the physical and chemical properties of hemihydrate gypsum, a certain amount of other chemical materials are added before gypsum curing to improve the strength of gypsum after curing. This additive is called gypsum reinforcing agent.
After consulting relevant data and chemical experiments, it is summarized as follows:
In the process of changing hemihydrate gypsum into dihydrate gypsum, adding water is the main factor affecting the setting time, strength, porosity and other properties of the material. Theoretically, the amount of water required for chemical reaction is 18.6%. In the actual production, the amount of water actually added is much larger than this. The purpose is to obtain a certain fluidity of gypsum slurry for pouring and molding. The amount of water not only affects the strength, density and water absorption of gypsum materials, Moreover, it also affects the setting time of gypsum. With the increase of water consumption, the setting time of gypsum increases. When the water consumption is 160-190%, there is no final condensation. If the water consumption is 50%, it is difficult to stir. If the water consumption is 40%, the setting time cannot be measured at all.
Formula of gypsum strength additive:
(1) Sodium humate 0.3 ~ 0.5%, building materials fiber waste liquid 10 ~ 12%, papermaking waste liquid 7.2 ~ 15.7%. Preparation and application: add the above prepared aqueous solution into gypsum powder according to the ratio of water to paste 1:1.25-1:1.45. After mixing, the fluidity is good and the pH value is controlled between 7.5 ~ 8. The flexural strength and compressive strength of gypsum products with humic acid and its salts are 1.35 ~ 1.97 times higher than those with pure water.
(2) Borax 0.2%, water 98.8% preparation and use: dissolve borax solution in water, then add gypsum powder with this solution according to the ratio of water to gypsum 1:1.4 ~ 1.6, and stir evenly to make handicrafts. The product has smooth surface, hard texture and high strength. Compared with pure water gypsum products, the flexural strength is increased by 1.9 times and the compressive strength is increased by 1.74 times.
(3) (surface enhancement) immerse the prepared handicraft with 1% polyoxyethylene aqueous solution for 10 minutes, which can increase its surface hardness, good wear resistance and high strength.
(4) (light and high-strength foamed gypsum crafts, weight ratio) gypsum powder 89-99%, rubber polymer latex 2.8, starch 0.5-5, surfactant 0.1-0.2. The reaction amount of water and gypsum is 0.1 ~ 0.2, and the latex foaming agent is prepared and used; Dissolve the additive in water, and then mix gypsum powder to make it.
(5) (weight ratio): 100 parts of gypsum, 15 ~ 20% of 107 glue, 5% of white emulsion glue and 80% of water. Preparation and use: dissolve the two glues in water to make a mixed whole glue solution, and then mix gypsum according to the ratio of the mixed solution to gypsum and the ratio of 1.3:1 for production.
(6) : floor glue 30%, 107 glue 10%, water 60%. Preparation and use: mix the two adhesives with water to form a mixed glue solution, and then mix gypsum according to the ratio of mixed solution to gypsum 1.4:1 for production.
(7) : melamine resin - 10 parts of commercially available solid powder melamine resin of ethylene glycol, dissolved with 25 parts of water, added with 3 parts of ethylene glycol, mixed and cooled to 10-15 ℃, added with 100 parts of hemihydrate gypsum, fully mixed and molded, and demoulded after one night.
(8) : limestone cement gypsum: Limestone: cement: water = 80:15:5:80 mixed evenly for injection molding
(9) : white cement, bauxite cement and ordinary portland cement can be used. The amount of gypsum is 5%, which is mixed evenly, and then water is added to stir and inject the mold.
(10) : tanning water reducer: 3 parts of commercial tanning water reducer and 100 parts of water are added to mix evenly to form an aqueous solution containing tanning water reducer. Gypsum: mixed aqueous solution = (1.6 ~ 1.8): 1
(11) : add phenolic resin into gypsum and mix it evenly according to water: paste: resin = 1:1.2:0.5
(12) : first prepare the aqueous solution of peach gum, add 2.5% liquid peach gum into the water, and then fully mix it with gypsum to make the mold.
(13) : polyester resin adds 3-5% of short fiber equivalent to the weight of gypsum into gypsum, and the mixed resin is used as filler to make mold.
(14) : calcium borate and sodium silicate hemihydrate gypsum: water: calcium borate = 100:70:15, mix and inject evenly, harden for more than 60 minutes, bake at 80 ℃ for 24 hours, immerse in the aqueous solution of sodium silicate, and treat in a vacuum of 10 mm Hg for 10 minutes.
(15) : potassium sulfate, potassium chloride and aluminum sulfate dissolve potassium sulfate or potassium chloride or aluminum sulfate accounting for 0.3-5% of hemihydrate gypsum into hot water at 70-100 ℃, paste: water = 100:70 ~ 100, mix and inject evenly, and allow it to cool and harden.
According to my bending test experiment, a report of a factory in Pingyi, Shandong Province β When the normal flexural strength of type A is 6.4 MPa, the dry flexural strength can be increased to 8.279 MPa and the water cement ratio can be reduced from 50% to 26% by adding reinforcing agent. In order to greatly improve its determination, we must start with the production process in order to better improve the strength.
No gypsum whitening agent