Effect of Gypsum Retarder Sodium Citrate on Strength

Overview of Gypsum Retarder Sodium Citrate

Sodium citrate has metal ion complexing ability, good pH adjustment and buffering properties. Sodium citrate is one of the most commonly used high-efficiency retarders for building gypsum. Sodium citrate has obvious retarding effect on gypsum and can be used as gypsum retarder. Use coagulant, but the amount of coagulant should not be too much, otherwise it will affect the strength of gypsum

Effect of Gypsum Retarder Sodium Citrate on Strength

1. The strength of gypsum mixed with three retarders, citric acid, sodium polyphosphate and borax, decreases with the increase of the content, and the changing laws and trends of dry strength and wet strength are similar.

2. After adding citric acid, the dry and wet strengths of the gypsum samples decreased greatly. The dry flexural strength decreases sharply when its content is greater than 0.07%; the dry compressive strength decreases sharply when its content exceeds 0.05%; and the wet flexural strength decreases almost linearly, when the content is 0.1 %, the wet flexural strength of mold gypsum is only 0.5MPa.

3. After adding sodium polyphosphate, the decreasing trend of the strength of mold gypsum is much smaller than that of citric acid, but it is more obvious than that of borax.

4. In the case of the same amount of retarder, the influence on gypsum strength is as follows: borax < sodium polyphosphate < citric acid, which is in the same order as their influence on setting time.

In terms of the effect on gypsum strength, borax is the most suitable retarder for the three types of retarders; although sodium polyphosphate has a greater negative impact on gypsum strength than borax, it can also be used in a small amount. Used as a retarder. If citric acid is used as retarder, its content should be controlled below 0.03%.

Application of gypsum retarder sodium citrate

(1) The hemihydrate gypsum content is 0.03%-0.5%;

(2) With the increase of gypsum retarder content, the setting time is prolonged;

(3) With the increase of temperature, the content of gypsum retarder needs to be increased appropriately;

(4) Due to the different types and properties of gypsum, the effect of gypsum retarder may be different, so the dosage should be determined before use.

This product is suitable for gypsum products such as gypsum, bonded gypsum, caulking gypsum, gypsum and prefabricated gypsum components.

Gypsum retarder sodium citrate price

The price of gypsum retarder sodium citrate will change randomly with the production cost, transportation cost, international situation, exchange rate and supply and demand of gypsum retarder sodium citrate market. Tanki New Materials Co., Ltd. aims to help industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for Gypsum Retarder Sodium Citrate, please feel free to send an inquiry to get the latest price of Gypsum Retarder Sodium Citrate.

Gypsum retarder sodium citrate suppliers

Supplier of Gypsum Retarder Sodium Citrate, Tanki New Materials Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced and engineered materials. The company has successfully developed a series of powder materials (concrete waterproof admixture, gypsum foaming agent, gypsum defoamer, gypsum waterproofing agent), high-purity target materials, functional ceramics and structural devices, and provides OEM services.

Suggested dosage of gypsum retarder (take pure hemihydrate gypsum as an example)

Gypsum retarder content (%) gypsum content (%) gypsum setting time

0.1                                            0.5                                30min~1h

0.15                                          0.5                                1h~1h30min

0.2                                            0.5                                1h30min~2h

0.3                                            0.5                                2h~3h

0.4                                            0.5                                3h~5h