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Chemically modified silicate adhesive and preparation method thereof

A chemical modification and adhesive technology, which is applied in the direction of alkali metal silicate coatings, adhesives, inorganic adhesives, etc., can solve the problem of reducing the water resistance, corrosion resistance, storage stability, and self-curing performance of adhesives Poor, reduced heat resistance, weather resistance, oil resistance and organic solvent resistance, etc., achieve chemical stability and physical and mechanical properties, excellent water resistance and heat resistance, and improve mechanical properties and water resistance.

Active Publication Date: 2019-05-17
刘恩林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Water-soluble silicate adhesives (lithium, sodium, potassium and ammonium) are safe, environmentally friendly, energy-saving and inexpensive products, and their heat resistance, non-combustibility, weather resistance and resistance to various oils and organic solvents are Organic adhesives cannot be surpassed, but their shortcomings cannot be ignored. The main disadvantages are: poor self-curing performance, poor water resistance and corrosion resistance, and poor physical and mechanical properties due to high hardness
This method can improve the physical and mechanical properties and construction applicability of the water-soluble silicate adhesive, but it reduces its heat resistance, weather resistance, oil resistance and organic solvent resistance.
[0005] In chemical modification, inorganic strong acid (hydrochloric acid, sulfuric acid, etc.) or medium-strong acid phosphoric acid was used as modifier at the earliest. The addition of this modifier reduces the content of alkali metal oxides in the silicate solution and increases the Modulus of silicate, but this modifier can only be used in low-concentration silicate solution, otherwise the silicate solution will be gelled and scrapped
At the same time, the addition of these modifiers also brings in harmful chloride ions and sulfate ions, which reduces the water resistance, corrosion resistance and storage stability of the adhesive.
Another is to use water-soluble inorganic salts, amphoteric oxides or hydroxides, such as calcium chloride, magnesium chloride, zinc chloride, aluminum chloride, zinc oxide and aluminum hydroxide and sodium fluorosilicate, sodium metaaluminate, borax, Sodium polyphosphate (potassium) salt, etc., the purpose of adding these modifiers is to use the cationic or anionic hybrid polysilicate molecular structure, thereby improving its water resistance and corrosion resistance, but these water-soluble The addition of inorganic salts also brings in chloride ions, fluoride ions and sodium ions, etc., which will reduce the storage stability of the silicate solution and the water resistance, weather resistance and corrosion resistance of the film after use.

Method used

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  • Chemically modified silicate adhesive and preparation method thereof
  • Chemically modified silicate adhesive and preparation method thereof
  • Chemically modified silicate adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the chemically modified sodium silicate adhesive is as follows: a stainless steel reaction kettle equipped with a reflux condenser and a turbo stirrer is used, and a sodium silicate solution (the active ingredient content is 34.2, and the modulus n=3.2 ), start stirring, add modifier boric acid or boric anhydride in the reactor, react 0.5h, the reactor is heated, heated to a certain temperature, continue to stir and react for a certain period of time, the reaction is completed, filter with 80 mesh nylon silk, Packaging products. The following table 1 is the batching ratio of boric anhydride modified sodium silicate solution under different conditions, and table 2 is the batching ratio of boric acid modified sodium silicate solution under different process conditions.

[0028] The proportioning ratio of boric anhydride modified sodium silicate solution under different process conditions in table 1

[0029] Sample serial number

1

...

Embodiment 2

[0048] Example 2 Application of water-based inorganic zinc-rich paint as an adhesive.

[0049] Water-based inorganic zinc-rich coatings:

[0050]

[0051] Part B

[0052] Modified adhesive (sample 1) 50.0

[0053] First mix the component A in the dry powder mixer evenly, then mix the component A and component B at a ratio of 2.5:1.0, and disperse evenly to obtain a water-based inorganic zinc-rich coating. The main properties of the coating are measured:

[0054] (1) Anti-sag performance ≥ 500μm (wet film thickness);

[0055] (2) Salt spray resistance test (GB / T1771) 1500h, no change.

Embodiment 3

[0056] Application of embodiment 3 in water-based inorganic anti-high temperature oxidation coating

[0057] Water-based inorganic high temperature oxidation resistant coating

[0058]

[0059] Part B

[0060] Modified adhesive (sample 5) 100.0

[0061] First, disperse component A in a high-speed mixer until the fineness reaches below 60 μm, then mix components A and B at a ratio of 1:1, and disperse evenly to obtain a water-based inorganic high-temperature oxidation-resistant coating.

[0062] The above-mentioned coating can be used for a long time at 600-800°C, or intermittently at 1300°C, which can prevent the high-temperature oxidation of the metal substrate and prolong the service life of the coating.

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Abstract

The invention belongs to the field of chemical adhesives, and particularly relates to a chemically modified silicate adhesive and a preparation method thereof. Boric anhydride or a boric acid modifiedsilicate solution is adopted, excellent water resistance and heat resistance are achieved, the chemical stability and physical and mechanical properties are significantly improved, and the chemicallymodified silicate adhesive can be stored for a long time. The chemically modified silicate adhesive can be used as an adhesive for a coating, a refractory material, a heat-resistant material and a sound-insulating material and an admixture for cement to enable the materials using the adhesive to have excellent heat resistance, mechanical strength and water resistance; the chemically modified silicate adhesive can further be used as a wood processing adhesive to replace a urea-formaldehyde resin adhesive, a phenolic-formaldehyde resin adhesive and a melamine-formaldehyde resin adhesive in woodprocessing, avoid volatilization of formaldehyde, phenol and other organic matter in boards and achieve the harmlessness of the boards; and the chemically modified silicate adhesive can further be used as a molding adhesive for powdered waste, and formed pellets are enable to have certain mechanical strength and water resistance and are not prone to scattering.

Description

technical field [0001] The invention belongs to the field of chemical adhesives, and mainly relates to a chemically modified silicate adhesive and a preparation method thereof. Background technique [0002] Water-soluble silicate adhesives (lithium, sodium, potassium and ammonium) are safe, environmentally friendly, energy-saving and inexpensive products, and their heat resistance, non-combustibility, weather resistance and resistance to various oils and organic solvents are Organic adhesives cannot be surpassed, but their shortcomings cannot be ignored. The main disadvantages are: poor self-curing performance, poor water resistance and corrosion resistance, and poor physical and mechanical properties due to high hardness. In addition, the storage stability of the adhesive solution is poor, and there is a phenomenon of gel precipitation due to aging. [0003] In order to improve the performance of this adhesive, researchers have made many improvements. The first is to physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/02C09J11/04C09D1/02C09D7/61C09D5/10C09D5/18C04B12/04C04B28/26C04B35/63C04B35/66C04B35/22C04B111/20C04B111/28C04B111/82
Inventor 刘恩林
Owner 刘恩林