CN105585270A

CN105585270A - Method for preparing melamine formaldehyde resin water reducer

Info

Publication number: CN105585270A
Application number: CN201410560635.7A
Authority: CN
Inventors: 王光庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-10-21
Filing date: 2014-10-21
Publication date: 2016-05-18

Abstract

The invention discloses a method for preparing a melamine formaldehyde resin water reducer, which belongs to the field of chemical industry. The melamine formaldehyde resin water reducer comprises the following raw materials in percentage by weight: 34-35% of liquid melamine formaldehyde resin, 3-4% of sodium methacrylate, 4% of maleic anhydride, 2% of potassium persulphate, 1% of sodium hydroxide, and 55% of deionized water. The finished product is prepared by a blending method under specific condition. The preparation method has simple process, the product is nontoxic, and can be used for various cements, and the product is characterized in that separation of the raw materials can be protected, concretes with consistent quality can be produced; the product has good usability in a long period; deep precipitation of the concrete is reduced by reducing bleeding; and the product has good water reduction effect and slump loss resistance; and the water reducer has good water-reducing rate and good concrete workability.

Description

A kind of preparation method of melamine resin water reducer

Technical field:

The invention belongs to chemical field, relate in particular to a kind of preparation method of melamine resin water reducer.

Background technology:

Water reducer is a kind of intensity that can improve mortar, do not affecting under the condition of concrete construction workability, there is diminishing and humidification, the high efficiency water reducing agent that is referred to as that general water-reducing rate is greater than 8%, the action principle of water reducer is, normally a kind of surfactant of water reducer, and it is adsorbed in cement particle surface makes particle show electrical property, between particle, mutually repel due to band identical charges, cement granules is dispersed and unnecessary moisture and produce water-reduction between release particles; On the other hand, owing to adding after water reducer, cement particle surface forms absorption film, affect the hydration rate of cement, make the growth of Behavior of Hardened Cement Paste crystal more perfect, reduce the capillary gap of moisture evaporation, network structure is more fine and close, has improved hardness and the compact structure of cement mortar; The function of water reducer is, cement granules is disperseed, and improves workability, reduces water consumption, thereby improves compactness and the hardness of cement-based material, increases its mobility. Melamine resin is the polymer that melamine and formolite reaction obtain, and the melamine resin water white transparency after solidifying is stable in boiling water, has self-extinguishment, arc resistance and good mechanical property. That melamine resin has is fire-retardant, diminishing, water-fast, heat-resisting, oil resistant, resistance to alcohol, anti-pollution, ageing-resistant, resistance to electric arc, resistance to chemical attack, have good insulating properties, glossiness and mechanical strength, is widely used in wet strengthening agents for papermaking, crosslinking agent, flocculant, fire retardant, water reducer etc.; Also can be made into tableware and the tableware of the imitative porcelain of various colors. The present invention is a kind of water reducer, product is mainly used in being added in concrete, the raw material that the present invention uses has: liquid melamine formaldehyde resin, Sodium methacrylate, maleic anhydride, potassium peroxydisulfate, NaOH, deionized water, and be aided with certain process conditions and produce water reducer, this preparation method's advantage is: production technology is simple, and product is nontoxic, is applicable to various cement, be characterized in: 1. can protect the separation of raw material, thus the consistent concrete of quality bills of materials; 2. in the long period, have good workability; 3. reduce bleeding and reduce concrete dark shallow lake; 4. there is good water-reducing effect and slump retaining; Water-reducing rate is high, concrete workability good.

Summary of the invention:

The problem to be solved in the present invention is to provide a kind of preparation method of melamine resin water reducer, and the raw material of producing this product use has: liquid melamine formaldehyde resin 34%-35%, Sodium methacrylate 3%-4%, maleic anhydride 4%, potassium peroxydisulfate 2%, NaOH 1%, deionized water 55%.

The present invention can be achieved through the following technical solutions:

A preparation method for melamine resin water reducer, its feature is made up of following steps:

(1) respectively the Sodium methacrylate of formula ratio, maleic anhydride, potassium peroxydisulfate, NaOH are added water by weight 5 times and is mixed with the aqueous solution with 4 stirred vessels, the deionized water of formula ratio is exhausted;

(2) aqueous solution of Sodium methacrylate, maleic anhydride, potassium peroxydisulfate, NaOH is sent into chemical reaction kettle simultaneously, start to stir, to slowly temperature be increased to 65-70 DEG C while stirring, the liquid melamine formaldehyde resin of formula ratio is added to chemical reaction kettle, after stirring, stop stirring, after insulation reaction 1.5-2 hour, stir again after 0.2-0.3 hour and obtain finished product.

Further technical scheme of the present invention is:

The described reaction temperature of step (2) is 67.5 DEG C, and the insulation reaction time is 1.75 hours.

The invention has the beneficial effects as follows: the preparation method that a kind of melamine resin water reducer is provided, this preparation method's technique is simple, and product is nontoxic, applicable to various cement, be characterized in: 1. can protect the separation of raw material, thus the consistent concrete of quality bills of materials; In long period, have good workability; Reduce bleeding and reduce concrete dark shallow lake; There is good water-reducing effect and slump retaining; Water-reducing rate is high, concrete workability good.

Detailed description of the invention

Embodiment 1

With 4 stirred vessels be 3% Sodium methacrylate by accounting for total amount respectively, to account for total amount be 4% maleic anhydride, account for total amount is 2% potassium peroxydisulfate, account for total amount is that 1% NaOH adds water by weight 5 times and is mixed with the aqueous solution, the deionized water of formula ratio is exhausted; The aqueous solution of Sodium methacrylate, maleic anhydride, potassium peroxydisulfate, NaOH is sent into chemical reaction kettle simultaneously, start to stir, to temperature be increased to 65 DEG C slowly while stirring, be that 35% liquid melamine formaldehyde resin adds chemical reaction kettle by accounting for total amount, after stirring, stop stirring, insulation reaction stirs after 2 hours after 0.2 hour again and obtains finished product.

Embodiment 2

With 4 stirred vessels be 3.5% Sodium methacrylate by accounting for total amount respectively, to account for total amount be 4% maleic anhydride, account for total amount is 2% potassium peroxydisulfate, account for total amount is that 1% NaOH adds water by weight 5 times and is mixed with the aqueous solution, the deionized water of formula ratio is exhausted; The aqueous solution of Sodium methacrylate, maleic anhydride, potassium peroxydisulfate, NaOH is sent into chemical reaction kettle simultaneously, start to stir, to temperature be increased to 67.5 DEG C slowly while stirring, be that 34.5% liquid melamine formaldehyde resin adds chemical reaction kettle by accounting for total amount, after stirring, stop stirring, insulation reaction stirs after 1.75 hours after 0.25 hour again and obtains finished product.

Embodiment 3

With 4 stirred vessels be 4% Sodium methacrylate by accounting for total amount respectively, to account for total amount be 4% maleic anhydride, account for total amount is 2% potassium peroxydisulfate, account for total amount is that 1% NaOH adds water by weight 5 times and is mixed with the aqueous solution, the deionized water of formula ratio is exhausted; The aqueous solution of Sodium methacrylate, maleic anhydride, potassium peroxydisulfate, NaOH is sent into chemical reaction kettle simultaneously, start to stir, to temperature be increased to 70 DEG C slowly while stirring, be that 34% liquid melamine formaldehyde resin adds chemical reaction kettle by accounting for total amount, after stirring, stop stirring, insulation reaction stirs after 1.5 hours after 0.3 hour again and obtains finished product.

Claims

1. a preparation method for melamine resin water reducer, the raw materials by weight of use is calculated and is comprised: liquid melamine formaldehyde resin 34%-35%, Sodium methacrylate 3%-4%, maleic anhydride 4%, potassium peroxydisulfate 2%, NaOH 1%, deionized water 55%; It is characterized in that:

2. the preparation method of a kind of melamine resin water reducer according to claim 1, is characterized in that: the described reaction temperature of step (2) is 67.5 DEG C, and the insulation reaction time is 1.75 hours.