CN102923987A

CN102923987A - Retardant preparation method

Info

Publication number: CN102923987A
Application number: CN 201210479644
Authority: CN
Inventors: 杨益
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-23
Filing date: 2012-11-23
Publication date: 2013-02-13

Abstract

The invention discloses a retardant preparation method. The method is characterized in that by weight percent in the total weight, 25-85 percent of water, 20-30 percent of aluminium hydroxide, 10-20 percent of tartaric acid and 25-35 percent of phosphate are adopted as raw materials. According to the method, after being added in magnesite slurry, the retardant is reacted with Mg<2+> of the slurry to generate sparingly soluble salts which are coated on the surface and can prohibit the Mg2 from being in contact with water molecules, thereby playing a role of delaying coagulation; the more the retardant is added, the larger the cover degree is and the more obvious the coagulation delaying effect is. Besides, water molecules can permeate the MgO coated by the retardant through diffusion, so as to generate an osmotic pressure; and when the pressure reaches a certain extent, the cover layer is broken, the MgO is further hydrated, and the hydration and rigidification speed is slower.

Description

A kind of preparation method of retardant

Technical field

The present invention relates to a kind of magnesite binding material properties-correcting agent, particularly relate to a kind of preparation method of retardant.

Background technology

Magnesite binding material claims again magnesia cement, it is a kind of air hardening cementitious materials, when manufacturing a product with this material, having with it does not need moist maintenance, and gain in strength is fast, and anti-folding, ultimate compression strength are high, weakly alkaline, low-corrosiveness, elasticity is high, good toughness, lightweight, organic and inorganic materials or fiber is had preferably the characteristics such as cementing properties, is widely used in the fields such as building, decoration, urban construction, agricultural.Even so, because the slip presetting period of this material is too short, the goods water resistance is poor, be unfavorable for the forming operation of slurry in making the finished product process, be difficult to guarantee the visual appearance of goods, this is the unsurmountable defective that existing magnesite binding material exists.

Summary of the invention

Task of the present invention is can effectively delay its slurry presetting period for the defective that overcomes above-mentioned prior art existence provides a kind of, improves the preparation method of a kind of retardant of goods water tolerance.

A kind of preparation method of retardant, be that to adopt water, aluminium hydroxide, tartrate phosphoric acid be raw material, and each raw material shared weight percent in gross weight is respectively: water 25-35%, aluminium hydroxide 20-30%, tartrate 10-20%, phosphoric acid 25-35%.

Above-mentioned each raw material is retardant for magnesite binding material of the present invention by taking out tinning in the rear adding of its per-cent metering reactor after stirring 30-60 minutes under the normal temperature condition.Because the composition of magnesia cement is to be calcining and the magnesia after Raymond mill is levigate under 800-850 ℃ the condition in temperature by wagnerite, proportion is 1.22-1.24g/cm ³Magnesium chloride solution and Paris white, talcum powder, calcite in powder, sand in etc. the organic plant fiber such as inert material and powdered rice hulls, saw powder.After retardant of the present invention joins in the magnesite slip, will with slurry in Mg ²⁺Reaction generates a kind of difficulty soluble salt and covers the surface, stops Mg ²⁺Contact with water molecules, play delayed coagulation.The retardant incorporation is more, and then level of coverage is larger, and delayed coagulation is more obvious.On the other hand, water molecules infiltrates by retardant by diffusion and coats in the MgO molecule of lid, produces osmotic pressure, and after this pressure acquired a certain degree, tectum broke, and the further aquation of MgO has also namely delayed hydration and hardening speed.Thereby can effectively realize task of the present invention.

Embodiment

Embodiment one

A kind of preparation method of retardant, be by weight in shared weight percent be: water 30%, aluminium hydroxide 25%, tartrate 15%, phosphoric acid 30%, will be above-mentioned each raw material add in reactor and under normal temperature condition, stirred 45 minutes.

Embodiment two

A kind of preparation method of retardant, be by weight in shared weight percent be: water 25%, aluminium hydroxide 30%, tartrate 20%, phosphoric acid 25%.To under normal temperature condition, stir 30 minutes in above-mentioned each raw material adding reactor.

Embodiment three

A kind of preparation method of retardant, be by weight in shared weight percent be: water 35%, aluminium hydroxide 20%, tartrate 10%, phosphoric acid 35%.To under normal temperature condition, stir 60 minutes in above-mentioned each raw material adding reactor.

Claims

1. the preparation method of a retardant, be that to adopt water, aluminium hydroxide, tartrate, phosphoric acid be raw material, it is characterized in that the weight percent of each raw material in gross weight is respectively water 25-85%, aluminium hydroxide 20-30%, tartrate 10-20%, phosphoric acid 25-35%.

2. the preparation method of a kind of retardant according to claim 1 is characterized in that each raw material was stirred 30-60 minutes under normal temperature condition by its per-cent metering rear the adding in the reactor.