The water reducing agent can increase the flow of gypsum slurry and the strength of gypsum hardening, and is usually used for gypsum self -flowing mortar and brushing gypsum. At present, domestic water reduction agents are arranged according to the fluidity and strength effects. The use of water reduction agents in gypsum dry mixed building materials, in addition to considering the amount of water and strength, also pay attention to the losses of the condensation time and flow of the plaster building materials.
The biggest defect of gypsum products is that the water resistance is poor, and areas with large air humidity have higher water -resistant water resistance in gypsum mixed mortar. Generally, the water resistance of gypsum hardening is hard mixing material. In the condition of humid or saturated water, the hard mixing material of the outer water can make the gypsum hardening softening coefficient of more than 0.7, thereby meeting the product strength requirements. Chemical exterior additives can also be used to reduce the solubility of gypsum (that is, improve the softening coefficient), reduce the adsorption of gypsum to water (that is, reduce the water absorption rate) and reduce the water -resistant ways of erosion (that is, isolation with water). Gypsum waterproofing agents include ammonium borate, sodium sodium of methyl siliconol, silicone resin, emulsifier, good effect and organic silicon emulsion waterproofing agent.
Gypsum water-reducing agent is a chemical additive used in gypsum products. It is mainly used to reduce the water consumption in gypsum mortars or products while improving their working performance and physical properties. Here are some details about gypsum water-reducing admixtures:
Mechanism of action
The action mechanism of gypsum water-reducing agent mainly includes the following aspects:
Dispersion effect: The water-reducing agent can be adsorbed on the surface of gypsum particles to form a charge layer, which enhances the repulsive force between gypsum particles, thereby achieving the effect of dispersing the particles.
Lubricant effect: Water reducing agent can reduce the friction between gypsum particles, making the gypsum mortar smoother and more fluid.
Reduce water consumption: Through dispersion and lubrication, water reducing agents can significantly reduce water consumption without reducing the strength of gypsum products, thereby improving the density and strength of gypsum products.
type
Gypsum water-reducing agents can be divided into the following categories according to their chemical composition and mechanism of action:
Organic water-reducing agents: such as naphthalene-based, melamine-based, polycarboxylic acid-based, etc. These water-reducing agents have excellent water-reducing effects and good working performance.
Inorganic water-reducing agents: such as sodium silicate, potassium silicate, etc. Although this type of water-reducing agent has a relatively weak water-reducing effect, its cost is low and it is suitable for some occasions that do not require high performance.
Application scope
Gypsum water reducing agent is widely used in the production of gypsum boards, gypsum blocks, gypsum decorative moldings and other gypsum products. The use of water reducing agents can significantly improve the production efficiency of gypsum products, reduce production costs, and improve their physical properties and durability.
Precautions for use
Dosage control: The amount of water-reducing agent should be determined according to the specific requirements of the gypsum products and the type of water-reducing agent. Excess or insufficient may affect the performance of the gypsum products.
Compatibility test: Before using the water-reducing agent, a compatibility test should be conducted to ensure that the water-reducing agent has good compatibility with other raw materials of the gypsum mortar.
Mix evenly: During the mixing process, ensure that the water-reducing agent and gypsum mortar are fully mixed and evenly mixed to avoid local concentrations that are too high or too low.
Storage conditions: Water reducing agent should be stored in a dry, cool and ventilated place, away from direct sunlight and high temperatures.
Select suggestions
When choosing a gypsum water-reducing agent, it is recommended to consider the following factors:
Water-reducing effect: Choosing a water-reducing agent with good water-reducing effect can significantly improve the performance of gypsum products.
Cost-effectiveness: Comprehensively consider the price and performance of the water-reducing agent and choose products with high cost-effectiveness.
Brand reputation: Choose a brand with high visibility and good reputation to ensure the quality and performance of the water-reducing agent are stable and reliable.
