CN100531885C - Phosphate methacrylate anti-rust and anti-rust polymerizable emulsifier and preparation method thereof - Google Patents

Abstract

The present invention relates to a phosphate methacrylate antirust polymerisable emulsion with rust and the preparing technique thereof. The chemical structural formula of the phosphate methacrylate antirust polymerisable emulsion with rust is: and the method is: mixing the methacrylate-beta-hydroxyethyl, phosphoric acid and toluene according to the mass ratio, and adding the hydrochinone with 0.5% of the gross mass of methacrylate-beta- hydroxyethyl and phosphoric acid; decompressing and stirring the system, heating the reactant to 55 to 60 DEG C, separating the generated water from the boiling flask with the water segregator, and the solution A is obtained when the raw material has reacted for 5h; then decompressing the solution A and distilling the dissolvent toluene; taking out the product when the reaction has completed. Except for the common advantage of the common polumerisable emulsion the invention has the unique predominance: namely without adding the iron red or zinc phosphate in preparing the aqueous antirust coating with rust, and processing the antirust with rust function which is not processed by the common emulsion, the invention is a functional polymerisable emulsion and is evidently better than the traditional emulsion.

Description

Phosphate methacrylate anti-rust and anti-rust polymerizable emulsifier and preparation method thereof

technical field

The invention relates to a polymerizable emulsifier of methacrylic acid phosphate for preventing rust and rust and a preparation method thereof.

Background technique

Water-based antirust and rust coating is a new type of environmentally friendly coating. Compared with traditional solvent-based antirust and rust coatings, it has the advantages of non-toxicity, flame retardancy, aging resistance, chemical resistance, and strong adhesion. However, conventional antirust coatings generally use heavy metal salt pigments as the main components of antirust. Although these substances have antirust effects, they are gradually replaced due to the increasingly prominent environmental pollution problems they bring. Therefore, it is imminent to develop new antirust coatings.

Polymerizable emulsifiers are also called reactive emulsifiers. In their molecular structure, there are both lipophilic and hydrophilic emulsifying groups and a new generation of emulsifiers that can participate in free radical polymerization reaction functional groups. Since Bistline et al. used polymerizable emulsifiers for polymerization in 1956, a large number of polymerizable emulsifiers have been synthesized and applied to various aspects, and various materials with excellent performance have been obtained.

The polymerizable emulsifier has the following advantages: (1) Since the polymerizable emulsifier is connected to the surface of the polymer through a chemical bond, there will be no pollution or occurrence of pollution to the environment due to emulsifier molecules migrating to the surface of the paint film and being washed away by water. Coagulation; (2) If the amount of polymerizable emulsifier is appropriate, its reactivity is high, and there will be no emulsifier molecules in the water phase after polymerization, thereby speeding up the film-forming speed; (3) Because the emulsifier molecules bonded to the surface of the colloidal particles It will not migrate, and can improve the water resistance of the polymer film; (4) it can prepare functional polymers and composite polymers.

The polymerizable emulsifier prepared by the method of the present invention has the function of rust prevention and band rusting, and is used for preparing water-based rust prevention coatings without adding heavy metal salt pigments and can synthesize low-VOC value emulsions.

Contents of the invention

The purpose of the present invention is to use -β-hydroxyethyl methacrylate and phosphoric acid as raw materials, and adopts a special process that is: carry out esterification under reduced pressure to prevent self-polymerization of -β-hydroxyethyl methacrylate, and prepare a The anti-rust and anti-rust polymerizable emulsifier of phosphate acrylate can be popularized and applied in the preparation of anti-rust and anti-rust water-based coatings.

The present invention can be realized by following measures:

Phosphate methacrylate antirust band rust polymerizable emulsifier preparation steps are:

① Mix β-hydroxyethyl methacrylate, phosphoric acid, and toluene in a mass ratio of 6.6:4.9:1 in a flask, and add hydroquinone with 0.5% of the total mass of β-hydroxyethyl methacrylate and phosphoric acid;

②Depressurize the system to make the vacuum degree of the system reach 0.06-0.07MPa, start the stirrer at a speed of 200-300r/min, and heat the reactants to 55-60°C, and use the water separator to continuously transfer the generated water from the flask Separation, the raw material was reacted to obtain solution A after 5h;

③The solution A is decompressed, so that the vacuum of the system reaches 0.07-0.08MPa and the solvent toluene is distilled out;

④ After the reaction is completed, take out the product - phosphate methacrylate anti-rust and rust-resistant polymerizable emulsifier, and seal it for packaging;

Phosphate methacrylate antirust band rust polymerizable emulsifier, its chemical structure is:

Its reaction principle can be expressed by the following formula:

The advantage that the present invention has is:

Firstly, the present invention has the general advantages of conventional polymerizable emulsifiers. For example: ① The polymerizable emulsifier is connected to the surface of the polymer through chemical bonds; ② There are no emulsifier molecules in the water phase after polymerization, thus speeding up the film formation; ③ The emulsifier molecules bonded to the surface of the colloidal particles will not migrate and can Improves water resistance of polymer films.

Secondly, the present invention also has unique advantages: that is, it is not necessary to add iron red or zinc phosphate in the preparation of water-based antirust and rust coatings, and it also has the antirust and rust functions that ordinary emulsifiers do not have. It is a functional polymerizable Emulsifier, significantly better than traditional emulsifiers. Moreover, the production process is stable and reliable, creating favorable conditions for the production of water-based anti-rust coatings with rust.

Description of drawings

Fig. 1 is a schematic flow chart of the device of the present invention

Detailed ways

In conjunction with accompanying drawing, the present invention will be described in further detail again:

Example 1

As shown in Figure 1, in a two-necked flask 1, 132 grams of methacrylate-β-hydroxyethyl ester, 98 grams of 98% phosphoric acid, and 20 grams of toluene were mixed, and 0.125 grams of hydroquinone was added, and the system was decompressed to make the system Pressure reaches 0.06MPa, starts constant temperature magnetic stirrer 2 to stir (300r/min) and is heated to 60 ℃, constantly the water that is generated is separated by water separator 3, obtains solution A after reaction 4h (at this moment conversion rate reaches 60% ), the solvent toluene in the solution A is distilled under reduced pressure at 0.07MPa and reclaimed, after the reaction is completed, the product is taken out, sealed and packed.

Example 2

As shown in Figure 1, in a two-necked flask 1, 132 grams of methacrylate-β-hydroxyethyl ester, 98 grams of 98% phosphoric acid, and 20 grams of toluene were mixed, and 0.125 grams of hydroquinone was added, and the system was decompressed to make the system Pressure reaches 0.07MPa, starts constant temperature magnetic stirrer 2 to stir (300r/min) and is heated to 60 ℃, constantly the water that is generated is separated by water separator 3, obtains solution A after reaction 5h (this moment conversion rate reaches 70% ), the solvent toluene in the solution A is distilled under reduced pressure at 0.08MPa and reclaimed, after the reaction is completed, the product is taken out, sealed and packed.

Claims (1)

1, a kind of methacrylic acid phosphoric acid ester slushing polymerisable emulsifier preparation technology the steps include:

1. in flask, methacrylic acid-beta-hydroxy ethyl ester, phosphoric acid, toluene are pressed mass ratio 6.6:4.9:1 and mix, and add the hydroquinones of methacrylic acid-beta-hydroxy ethyl ester and phosphoric acid gross mass 0.5%;

2. with the system decompression, the system vacuum of making reaches 0.06-0.07MPa, starts agitator, and rotating speed is 200-300r/min, and reactant is heated to 55-60 ℃, utilizes water knockout drum that the water that generates is constantly told from flask, obtains solution A behind the raw material reaction 5h;

3. with the solution A decompression, the system vacuum of making reaches 0.07-0.08MPa distilling off solvent toluene;

4. after reaction is finished, take out product---methacrylic acid phosphoric acid ester slushing polymerisable emulsifier, the sealed cans packing;

Methacrylic acid phosphoric acid ester slushing polymerisable emulsifier, its chemical structural formula is:

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