Process for the preparation of an aqueous plasticizer for inorganic resins

Abstract

A process for preparing an inorganic resin water-based plasticizer is disclosed. This invention relates to the field of water-soluble silicate inorganic resin technology. The process involves taking 100 parts of water, adjusting the pH to 12 with liquid potassium hydroxide or sodium hydroxide, adding 40-50 parts of polyalkylsiloxane, heating to 140-160°C, reacting for 1.5-2.5 hours until the reactants are completely transparent, then cooling down; cooling to 95-100°C, maintaining the temperature, adding 100 parts of silica sol and 200-300 parts of catalyst A, and cooling to room temperature after the mixture changes from turbid to completely transparent. Then, adding 20-30 parts of protective solution B and stirring until homogeneous. Alkylation treatment of the inorganic resin causes the rigid structure of the silica molecular chain to generate alkyl branches, achieving toughening, plasticizing, strengthening, and water resistance.

Description

A preparation process for water-based plasticizers for inorganic resins Technical Field

[0001] This invention relates to the field of water-soluble silicate inorganic resin technology, and more specifically to a preparation process of an inorganic resin using a water-based plasticizer. Background Technology

[0002] Currently, water-soluble silicate inorganic resins are toughened and plasticized by adding synthetic resin emulsions or by adding single-molecule alkyl silicates for short-term toughening and plasticizing. The disadvantages of adding synthetic resin emulsions are: the high alkalinity of the inorganic resin (pH 11-12) reduces the storage stability of the emulsion, subsequently reducing the stability and performance of the compound system; existing and added additives in the emulsion increase VOC content, reducing the performance of the inorganic resin; it reduces the flame retardancy of the inorganic resin, increasing the risk of toxic and harmful substances generated during combustion; it reduces the original mildew resistance of the inorganic coating; and it reduces stain resistance. The disadvantages of adding single-molecule alkyl silicates for short-term toughening and plasticizing are: for example, adding sodium methylsilicate or potassium methylsilicate only improves the coating's toughness and water resistance in the short term; the alkylated silicate is easily precipitated after drying, causing the coating to develop spots and its performance to decline. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies and shortcomings of existing technologies by providing a process for preparing water-based plasticizers for inorganic resins. This process involves alkylating the inorganic resin to generate alkyl branches in the rigid structure of the inorganic resin's silicon-oxygen molecular chains, thereby achieving toughening, plasticizing, strengthening, and water resistance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: its operation steps are as follows:

[0005] Step 1: Take 100 parts of water, adjust the pH to 12 with liquid potassium hydroxide or sodium hydroxide, add 40-50 parts of polyalkylsiloxane, heat to 140-160℃, react for 1.5-2.5 hours until the reactants are completely transparent, then cool down.

[0006] Step 2: Cool down to 95-100℃, keep warm, add 100 parts of silica sol and 200-300 parts of catalyst A. After the mixture changes from turbid to completely transparent, cool down to room temperature, add 20-30 parts of protective solution B, and stir evenly.

[0007] Preferably, catalyst A is polyphosphate silicon.

[0008] Preferably, the protective liquid B is a polyquaternary ammonium salt.

[0009] Preferably, the liquid potassium hydroxide or sodium hydroxide in step one has a mass fraction of 30%.

[0010] Preferably, the silica content in the silica sol in step two is 30%.

[0011] Preferably, the active component of catalyst A in step two is 30%.

[0012] Preferably, the solute content of the protective solution B in step two is 50%.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides a preparation process for water-based plasticizers for inorganic resins, which generates alkyl branches in the rigid structure of the inorganic resin silicon-oxygen molecular chain by alkylation treatment, thereby achieving the purpose of toughening, plasticizing, strengthening and water resistance. Attached Figure Description

[0014] Figure 1 is a comparison table of water resistance tests performed on resin one and resin two prepared according to the present invention and existing resins.

[0015] Figure 2 is a comparison table of impact resistance tests performed on resin one and resin two prepared according to the present invention and existing resins.

[0016] Figure 3 is a comparison table of the thermal stability tests of resin one and resin two prepared according to the present invention and existing resins. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] As shown in Figure 1, this specific embodiment adopts the following technical solution: its operation steps are as follows:

[0019] Step 1: Take 100 parts of water, adjust the pH to 12 with 30% liquid potassium hydroxide or sodium hydroxide, add 45 parts of polyalkylsiloxane, heat to 150℃, react for 1.5 to 2.5 hours until the reactants are completely transparent, then cool down.

[0020] Step 2: Cool down to 95-100℃, keep warm, add 100 parts of silica sol (silica content of 30%) and 200 parts of polyphosphoric acid silicon with an active ingredient content of 30%. After the mixture changes from turbid to completely transparent, cool down to room temperature, add 20 parts of polyquaternary ammonium salt with a solute content of 50%, and stir evenly.

[0021] Example 1: Mix 40-42 parts of a 30% solid content aqueous plasticizer solution, 100 parts of a 30% solid content silica sol and 37 parts of a 30% solid content potassium hydroxide solution, stir at 80-90°C for 1 hour, or after mixing, age at room temperature for 24 hours until a transparent gel is formed, thus obtaining resin one.

[0022] Example 2: Mix 40-42 parts of a 30% solid content water-based plasticizer solution and 140 parts of a 28% solid content potassium silicate solution with a modulus of 4.8. Stir at 80-90°C for 1 hour, or after mixing, age at room temperature for 24 hours until it becomes transparent to obtain resin 2.

[0023] Experiment 1: The water resistance of resin 1 from Example 1, resin 2 from Example 2, commercially available modified nano potassium silicate, and commercially available organic-inorganic composite resin were tested. The test conditions were 20 μm thick film immersed in water for 24 hours. The test results are shown in Figure 1.

[0024] Experiment 2: The resin 1 in Example 1, the resin 2 in Example 2, the commercially available modified nano potassium silicate, and the commercially available organic-inorganic composite resin were subjected to an impact test. The test conditions were: 0.5m high, 20um paint film, 1000 heavy hammer, 0.3mm wet sandpaper, and degreased tinplate. The test results are shown in Figure 2.

[0025] Experiment 3: The resin 1 in Example 1, the resin 2 in Example 2, the commercially available modified nano potassium silicate, and the commercially available organic-inorganic composite resin were subjected to a thermal stability test. The test conditions were 50°C for 30 days. The test results are shown in Figure 3.

[0026] The beneficial effects of this specific embodiment after adopting the above process are as follows: The present invention provides a preparation process for water-based plasticizers for inorganic resins. By alkylating inorganic resins, alkyl branches are generated in the rigid structure of the silicon-oxygen molecular chains of inorganic resins, thereby achieving the purposes of toughening, plasticizing, strengthening and water resistance.

[0027] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A preparation process for an inorganic resin-based water-based plasticizer, characterized in that: The operating steps are as follows: Step 1: Take 100 parts of water, adjust the pH to 12 with liquid potassium hydroxide or sodium hydroxide, add 40-50 parts of polyalkylsiloxane, heat to 140-160℃, react for 1.5-2.5 hours until the reactants are completely transparent, then cool down; Step 2: Cool down to 95-100℃, keep warm, add 100 parts of silica sol and 200-300 parts of catalyst A, wait until the mixture changes from turbid to completely transparent, then cool down to room temperature, add 20-30 parts of protective solution B, and stir evenly. The catalyst A is polyphosphate silicon, and the protective solution B is polyquaternary ammonium salt; the silica content in the silica sol is 30%, the active ingredient in catalyst A is 30%, and the solute content in protective solution B is 50%.

2. The preparation process of an inorganic resin water-based plasticizer according to claim 1, characterized in that: The mass fraction of liquid potassium hydroxide or sodium hydroxide in step one is 30%.

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