News Details
Water glass waterproof paint crosslinking agent
2017-8-1 17:00:37
Water glass waterproof paint crosslinking agent
This paper introduces the advantage of rich silicon dioxide content in rice husk ash, was treated with phosphoric acid reaction, with new type of sodium silicate water resistant silicon phosphate crosslinking agent, has found a way of making cheap silicon phosphate.
As an inorganic binder, water glass is widely used in many fields, such as ceramics, metal anticorrosion, coatings, cartons, grouting materials and welding materials. And it has the advantages of cheap, non-toxic and high temperature. But sodium silicate as residues in the hardening material with strong water imbibition of alkali metal oxide, thus water resistance is poor, do not adapt to use in long-term moist environment, can't bear the impact of the hot water, boiling water, limiting the scope of application of the adhesive.
For a long time, people have done a lot of work to improve the water resistance of water glass. The most common method is to crosslinking agent is added in the sodium silicate, the earliest people use some inorganic acid or salts as a crosslinking agent added to sodium silicate, due to the intense reaction, crosslinking agent and sodium silicate is not easy to adjust and control, make waterglass appear prematurely condensed or uneven gel, thus greatly reduce the toughness of the sodium silicate, and the waterproof performance is still not much progress.
Recently people have developed a new type of water-glass crosslinking agent! Silicon phosphate, which effectively solves the defects of the former crosslinking agent, greatly improves the water resistance and toughness of water glass.
Silicon phosphoric acid is used to produce silicon and phosphoric acid reaction, so the production cost is relatively high. We know that our country has a lot of rice husk was used as the fuel of boiler burning, burning residue (ash) after mostly are treated as waste disposal, and contains a large number of silica in rice husk ash, so we can use cheap rice husk ash as an alternative to more expensive silica gel, using rice husk ash for making silicon phosphate and phosphoric acid reaction. After a long trial study, we finally got the ideal product.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
This paper introduces the advantage of rich silicon dioxide content in rice husk ash, was treated with phosphoric acid reaction, with new type of sodium silicate water resistant silicon phosphate crosslinking agent, has found a way of making cheap silicon phosphate.
As an inorganic binder, water glass is widely used in many fields, such as ceramics, metal anticorrosion, coatings, cartons, grouting materials and welding materials. And it has the advantages of cheap, non-toxic and high temperature. But sodium silicate as residues in the hardening material with strong water imbibition of alkali metal oxide, thus water resistance is poor, do not adapt to use in long-term moist environment, can't bear the impact of the hot water, boiling water, limiting the scope of application of the adhesive.
For a long time, people have done a lot of work to improve the water resistance of water glass. The most common method is to crosslinking agent is added in the sodium silicate, the earliest people use some inorganic acid or salts as a crosslinking agent added to sodium silicate, due to the intense reaction, crosslinking agent and sodium silicate is not easy to adjust and control, make waterglass appear prematurely condensed or uneven gel, thus greatly reduce the toughness of the sodium silicate, and the waterproof performance is still not much progress.
Recently people have developed a new type of water-glass crosslinking agent! Silicon phosphate, which effectively solves the defects of the former crosslinking agent, greatly improves the water resistance and toughness of water glass.
Silicon phosphoric acid is used to produce silicon and phosphoric acid reaction, so the production cost is relatively high. We know that our country has a lot of rice husk was used as the fuel of boiler burning, burning residue (ash) after mostly are treated as waste disposal, and contains a large number of silica in rice husk ash, so we can use cheap rice husk ash as an alternative to more expensive silica gel, using rice husk ash for making silicon phosphate and phosphoric acid reaction. After a long trial study, we finally got the ideal product.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Silicon is a series of phosphate with different mole ratio of SiO2 / P2O5 and different crystal forms of the material, the silica and phosphate according to certain proportion mixed heating reaction, as the change of temperature, reaction time and so on will produce a series of silicon phosphate product.
The waterproof mechanism of silicon phosphate. The water absorbing ability of water glass is caused by Na +, so the method to improve the water absorption is to increase the modulus of the water glass and reduce the relative content of the water absorption. Either the crosslinking agent is used to replace the Na + with a hydrophobic group or ion.
Rice husk ash # # # # pretreatment of low temperature heating temperature condensation crushing product # 1.3 drugs and instruments: hydrochloride (cp), nitrate (cp), phosphate (85%), balance, Ma Fulu, beaker, crucible, X-ray diffraction, etc. 1.4 the preparation of silicon phosphate 1.4.1 rice husk ash: the processing of rice husk ash is rice husk combustion residue after fully, which besides contains a lot of silicon dioxide, still contain a certain amount of metals and alkali metal, so with dilute hydrochloric acid soaking for a period of time before use, filtering, washing, drying, to remove metal and alkali metal ions.
According to take a certain amount of rice husk ash after processing, with weight method to determine the actual content of the silica, then SiO2 / P2O5 mole ratio within a certain range, 85% take a certain amount of phosphoric acid and rice husk ash, mix evenly, add Ma Fulu, low temperature (100-200? The reaction is 30 to 50 minutes, and then it heats up to 700-1000, right? For 50-80 minutes, Si3 (PO4) 4 and SiP2O7 are available.
When the molar ratio of SiO2 / P2O5 is controlled by 1.8-2.5, the phosphoric acid obtained is Si3 (PO4) 4. When the control of SiO2 / P2O5 mole was between 1.2 and 1.8, the obtained silicon phosphate was SiP2O7
By X-ray diffraction analysis, the diffraction data obtained was compared with the standard map (ASTM ca 22-1380, 25-755), with a similarity of 100%.
Through infrared spectrum analysis. Si3 (PO4) 4 has obvious absorption peaks at 711,795,1040,1120,1185,1312,1639cm-1. SiP2O7 has obvious absorption peaks at 675,711,761,761,776,1040,1120,1220,1312,1639cm-1, which is the same as the standard infrared absorption peak.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Silicon is a series of phosphate with different mole ratio of SiO2 / P2O5 and different crystal forms of the material, the silica and phosphate according to certain proportion mixed heating reaction, as the change of temperature, reaction time and so on will produce a series of silicon phosphate product.
The waterproof mechanism of silicon phosphate. The water absorbing ability of water glass is caused by Na +, so the method to improve the water absorption is to increase the modulus of the water glass and reduce the relative content of the water absorption. Either the crosslinking agent is used to replace the Na + with a hydrophobic group or ion.
Rice husk ash # # # # pretreatment of low temperature heating temperature condensation crushing product # 1.3 drugs and instruments: hydrochloride (cp), nitrate (cp), phosphate (85%), balance, Ma Fulu, beaker, crucible, X-ray diffraction, etc. 1.4 the preparation of silicon phosphate 1.4.1 rice husk ash: the processing of rice husk ash is rice husk combustion residue after fully, which besides contains a lot of silicon dioxide, still contain a certain amount of metals and alkali metal, so with dilute hydrochloric acid soaking for a period of time before use, filtering, washing, drying, to remove metal and alkali metal ions.
According to take a certain amount of rice husk ash after processing, with weight method to determine the actual content of the silica, then SiO2 / P2O5 mole ratio within a certain range, 85% take a certain amount of phosphoric acid and rice husk ash, mix evenly, add Ma Fulu, low temperature (100-200? The reaction is 30 to 50 minutes, and then it heats up to 700-1000, right? For 50-80 minutes, Si3 (PO4) 4 and SiP2O7 are available.
When the molar ratio of SiO2 / P2O5 is controlled by 1.8-2.5, the phosphoric acid obtained is Si3 (PO4) 4. When the control of SiO2 / P2O5 mole was between 1.2 and 1.8, the obtained silicon phosphate was SiP2O7
By X-ray diffraction analysis, the diffraction data obtained was compared with the standard map (ASTM ca 22-1380, 25-755), with a similarity of 100%.
Through infrared spectrum analysis. Si3 (PO4) 4 has obvious absorption peaks at 711,795,1040,1120,1185,1312,1639cm-1. SiP2O7 has obvious absorption peaks at 675,711,761,761,776,1040,1120,1220,1312,1639cm-1, which is the same as the standard infrared absorption peak.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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