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Instant laminar sodium metasilicate

A sodium metasilicate, layered technology, applied in the field of inorganic silicon material instant layered sodium metasilicate, can solve the problems of slow calcium ion exchange, slow speed, loss of builders, etc.

Inactive Publication Date: 2006-01-11
张晓武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are 4A zeolite, hydrated sodium metasilicate, crystalline sodium disilicate, sodium citrate, nitrilotriacetic acid, horse-propylene copolymer, soda ash composition, etc. that can serve as phosphorus-free builders. None of them can completely replace STPP, either because of defects in technical performance or economically uneconomical
In terms of technology and economy, 4A zeolite is the most widely used phosphorus-free additive at present, but 4A zeolite has a slow exchange rate for calcium ions and almost no exchange capacity for magnesium ions. Precipitation by itself; single washing function and water insolubility limit its application in detergents
4A zeolite is not yet an ideal builder, so its promotion is slow, so that the demand has shrunk in recent years
However, the crystal form of layered crystalline sodium disilicate is unstable, and the use conditions are quite harsh. Poor water solubility results in slow binding of calcium and magnesium ions, and weak dispersing ability to dirt.
Especially water-insoluble can not adapt to the development trend of detergent builders, and the cost is too high, losing the significance of detergent builders
Therefore, layered crystalline sodium disilicate has not been promoted so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 260g quartz sand (SiO 2 98%), put 380g of liquid caustic soda (NaOH42%) into the reaction tank, add appropriate amount of water, react for 6 hours at 180°C in a sealed state, and cool to obtain 940g of sodium silicate solution (modulus = 2.1, Baume degree = 40) . Then add 419g of liquid caustic soda (NaOH42%) into the reaction tank and mix with the sodium silicate solution, stir at 110℃, and after reacting for 20min, add 22gK 2 CO 3 With Al 2 O 3 The reaction was concentrated to a Baume degree of 50, and 7g of sodium polyacrylate, a cationic distribution promoter, was added and stirred for 30 minutes. Then pass the reacted solution into a special small centrifugal spray dryer (evaporation volume 1Kg / h), and dry the crystals at an inlet temperature of 250-400℃. The recovered crystals with a particle size of 60-100 mesh are instant layered metasilicic acid Sodium finished product.

[0030] 10s

[0031] According to the detergency determination metho...

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PUM

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Abstract

An instant laminated sodium metasilicate is disclosed, which can be used as an excellent multifunctional phosphur-free detergent aid or in ceramics, textile, electroplating and building fields. Its molecular formula is xNa2O.ySiO2.zM; where M is an inorganic oxide. Its advantages are high water solubility and detergency, and high soaking, emulsifying, dispersing and water-softening power.

Description

Technical field [0001] The invention relates to an inorganic silicon material quick-dissolving layered sodium metasilicate, which can be used as a non-phosphorus builder and can be used in building materials and chemical industries. Background technique [0002] Phosphate-free detergents are the general trend, but sodium tripolyphosphate (STPP) is a very good builder. To replace it, it must meet the following requirements: [0003] (1) It has a good water softening effect; (2) It has a synergistic effect with surfactants; (3) It has a certain decontamination ability; (4) It can emulsify oily dirt deposits; (5) It can disperse dirt particles and reduce dirt deposits (6) Alkaline and buffering effect; (7) No damage to clothing, no corrosive effect; (8) Ecological safety; (9) Technically feasible, economically reasonable, and the cost cannot exceed STPP. [0004] At present, 4A zeolite, hydrated sodium metasilicate, crystalline sodium disilicate, sodium citrate, nitrile triacetic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/32C11D3/08
Inventor 张晓武
Owner 张晓武
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