CN110922882B - Solvent-free single-component polyurethane waterproof coating and production process thereof - Google Patents
Solvent-free single-component polyurethane waterproof coating and production process thereof Download PDFInfo
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- CN110922882B CN110922882B CN201911213517.8A CN201911213517A CN110922882B CN 110922882 B CN110922882 B CN 110922882B CN 201911213517 A CN201911213517 A CN 201911213517A CN 110922882 B CN110922882 B CN 110922882B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Abstract
The invention discloses a solvent-free single-component polyurethane waterproof coating, which relates to the field of waterproof coatings and comprises the following components: low viscosity bio-based polyether polyols, silicone modified isocyanates and propylene oxide butyl ether. The polyurethane resin is not used with metal and amine polyurethane catalysts, does not need plasticizers and organic solvents, and can be rapidly cured at normal temperature. The solvent-free single-component polyurethane waterproof coating produced by the method eliminates the hydrogen bond association among molecules, reduces the cohesive energy of the system, perfectly solves the problems of environmental protection and safety of common polyurethane products, and simultaneously avoids the common problems of material migration, unpleasant smell, poor construction hand feeling and the like caused by using a large amount of low-viscosity plasticizer and latent curing agent; the solvent-free single-component polyurethane waterproof coating has the advantages of environmental protection, safety, no pollution, strong bonding force with a base layer, water resistance, corrosion resistance and capability of meeting waterproof projects with higher requirements on environmental protection.
Description
Technical Field
The invention relates to the field of waterproof paint, in particular to solvent-free single-component polyurethane waterproof paint and a production process thereof.
Background
The most recognized and widely used of waterproof coatings for construction is the polyurethane waterproof coating. The waterproof coating has excellent waterproof performance and moderate price, the dosage is second to that of modified asphalt waterproof coiled materials and self-adhesive waterproof coiled materials, and the yield accounts for more than 35 percent of the total amount of the waterproof coating. In particular to a solvent-free single-component polyurethane waterproof coating which can be used immediately without proportioning and stirring, thereby greatly facilitating the operation of workers.
Polyurethane waterproof coatings have many performance advantages, but the disadvantage is also very obvious, namely the organic solvent is contained. This is a main cause of poisoning and fire accidents, and thus safety accidents of the polyurethane waterproof coating material have frequently occurred over the years. The current method for reducing the viscosity of polyurethane waterproof paint without using organic solvent is roughly 2 methods: (1) a large amount of low-viscosity plasticizer is used instead of the organic solvent; (2) a low viscosity reactive diluent (i.e., a latent curing agent) is added to reduce viscosity.
However, both of the above methods have their own disadvantages: the method of using a plasticizer instead of an organic solvent and reducing the addition ratio of the powder filler does reduce the viscosity of the coating material for a certain period of time, but the plasticizer gradually migrates out of the coating film with time, and particularly the low molecular weight plasticizer causes the elasticity of the coating film to be reduced, and the coating film to be hard and cracked, and water leakage is easily caused. The viscosity reduction method by adding the active diluent (namely the latent curing agent) can ensure the stability of the coating film and avoid the migration because the latent curing agent finally participates in the reaction. However, the viscosity of the polyurethane prepolymer is high, so that the addition amount of the latent curing agent is high, and the product cost is high; when the latent curing agent reacts with water vapor, the released small molecular aldehyde gas (such as benzaldehyde) has large smell and low micro toxicity, and causes secondary pollution; if the paint is stored for a long time, the self viscosity of the paint is gradually increased due to the fact that the high-activity latent curing agent absorbs a trace amount of moisture, and the construction hand feeling is affected.
Disclosure of Invention
The invention provides a solvent-free single-component polyurethane waterproof coating without using organic solvents such as plasticizer and the like and a production process thereof. The invention adopts the following technical scheme: a solvent-free single-component polyurethane waterproof coating comprises the following components: low viscosity bio-based polyether polyols, silicone modified isocyanates and propylene oxide butyl ether.
Preferably, the components also comprise one or more of wetting dispersant, talcum powder, silica powder, titanium dioxide, barite powder, color paste, flatting agent and defoaming agent.
Preferably, the low-viscosity bio-based polyether polyol is triglyceride epoxy derivative polyether polyol.
Preferably, the components comprise the following components in parts by weight: 32-45 parts of low-viscosity bio-based polyether polyol, 9-14 parts of siloxane modified isocyanate, 0.3-0.5 part of wetting dispersant, 5-15 parts of talcum powder, 5-10 parts of silica powder, 6-12 parts of titanium dioxide, 10-15 parts of barite powder, 3-5 parts of color paste, 7-15 parts of epoxypropane butyl ether, 0.5-1 part of flatting agent and 0.5-1 part of defoaming agent.
Preferably, the functionality of the siloxane modified isocyanate is 2.1-2.2.
Preferably, the low viscosity bio-based polyether polyol has a viscosity of no greater than 100 mpa.s.
A production process of a solvent-free single-component polyurethane waterproof coating comprises the following steps:
a. adding low-viscosity bio-based polyether polyol and a wetting dispersant, mixing, and heating to A for stirring;
b. adding talcum powder, silica powder, titanium dioxide and barite powder, and then heating to B for vacuum dehydration;
c. cooling to C, adding siloxane modified isocyanate, heating to D, stirring, cooling to E, and adding propylene oxide butyl ether;
d. and (4) after dispersing for a period of time at a high speed, adding a flatting agent and a defoaming agent, stirring, defoaming in vacuum, and discharging.
Further, A is 100 +/-5 ℃, B is 115 +/-2 ℃, C is 55-60 ℃, D is 85 +/-2 ℃, and E is 70-75 ℃.
Preferably, the step b further comprises a nitrogen gas replacement step, and the step c further comprises a nitrogen gas introduction step.
The solvent-free single-component polyurethane waterproof coating does not use metal and amine polyurethane catalysts, does not need plasticizers and organic solvents, and can be quickly cured at normal temperature. The solvent-free single-component polyurethane waterproof coating produced by the method eliminates the hydrogen bond association among molecules, reduces the cohesive energy of the system, perfectly solves the problems of environmental protection and safety of common polyurethane products, and simultaneously avoids the common problems of material migration, unpleasant smell, poor construction hand feeling and the like caused by using a large amount of low-viscosity plasticizer and latent curing agent; the solvent-free single-component polyurethane waterproof coating has the advantages of environmental protection, safety, no pollution, strong bonding force with a base layer, water resistance, corrosion resistance, capability of meeting waterproof projects with higher requirements on environmental protection and waterproof projects with poor ventilation and closed space. The solvent-free single-component polyurethane waterproof coating is a single component, does not need weighing and stirring, can be directly used, and can be sprayed, blade-coated, brush-coated, roller-coated and the like during construction.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
a solvent-free single-component polyurethane waterproof coating comprises the following components in parts by weight: 38 parts of low-viscosity bio-based polyether polyol, 11 parts of siloxane modified isocyanate, 0.5 part of wetting dispersant, 8 parts of talcum powder, 5 parts of silica powder, 9 parts of titanium dioxide, 13 parts of barite powder, 3 parts of color paste, 8 parts of epoxypropane butyl ether, 0.5 part of flatting agent and 1 part of defoaming agent. The low-viscosity bio-based polyether polyol in the embodiment is triglyceride epoxy derivative polyether polyol, the viscosity of the low-viscosity bio-based polyether polyol is less than 100mpa.s, and the functionality of the siloxane modified isocyanate is 2.1-2.2. The barite powder has the density of 4.4g/cm3, the BaSO4 content of more than 97 percent, the SiO2 content of less than 2 percent and the content of water-soluble salt of less than 0.2 percent. The viscosity of the epoxypropane butyl ether is 2mpa.s, the epoxy value is more than or equal to 0.60, the organic chlorine value is less than or equal to 0.002, and the inorganic chlorine value is less than or equal to 0.005.
The preparation method comprises the following steps:
adding 38 parts of low-viscosity bio-based polyether polyol and 0.5 part of wetting dispersant into a reaction kettle, heating to (100 +/-5) ℃, uniformly stirring, sequentially adding 8 parts of talcum powder, 5 parts of silica powder, 9 parts of titanium dioxide, 13 parts of barite powder and 3 parts of color paste, heating to (115 +/-2) ℃, dehydrating for 3 hours under the vacuum degree (-0.095 to-0.1) MPa, and introducing nitrogen for 2 times during the dehydration.
And then cooling to 55-60 ℃, introducing nitrogen, adding 11 parts of siloxane modified isocyanate, slowly heating to (85 +/-2) DEG C, stirring at a constant temperature for 2 hours, cooling to 70-75 ℃, adding 8 parts of epoxypropane butyl ether, starting high-speed dispersion, adding 0.5 part of flatting agent and 1 part of defoaming agent after 20 minutes, stirring for 15 minutes, closing the nitrogen, carrying out vacuum defoaming for 20 minutes, and discharging.
Example 2:
a solvent-free one-component polyurethane waterproof coating is prepared by comparing with example 1, changing the parts of propylene oxide butyl ether only under the condition that other conditions are completely the same as example 1, taking 11 parts of propylene oxide butyl ether in example 2 and not changing the parts by weight of other components, and producing according to the preparation method of the solvent-free one-component polyurethane waterproof coating in example 1.
Example 3:
a solvent-free one-component polyurethane waterproof coating is prepared by comparing with example 1, changing only the parts of butyl ether propylene oxide under the same conditions as example 1 except that 14 parts of butyl ether propylene oxide are taken in example 3 and the parts by weight of other components are not changed, and by producing according to the preparation method of the solvent-free one-component polyurethane waterproof coating in example 1.
Example 4:
a solvent-free one-component polyurethane waterproof coating is prepared by comparing with example 1, changing the parts of butyl ether propylene oxide only under the condition of the same conditions as example 1, taking 20 parts of butyl ether propylene oxide in example 4 and not changing the parts by weight of other components, and preparing the solvent-free one-component polyurethane waterproof coating according to the preparation method of the solvent-free one-component polyurethane waterproof coating in example 1.
Example 5:
a solvent-free one-component polyurethane waterproof coating is prepared by comparing with example 1, under the condition that other conditions are completely the same as example 1, omitting propylene oxide butyl ether and keeping the weight parts of other components unchanged, and according to the preparation method of the solvent-free one-component polyurethane waterproof coating in example 1, preparing the solvent-free one-component polyurethane waterproof coating.
Example 6:
a one-component polyurethane waterproofing paint, in contrast to example 1, in the case where the other conditions were otherwise identical to example 1, the same amount of 4-tert-butylphenyl glycidyl ether was used in place of the propylene oxide butyl ether, and the parts by weight of the other components were not changed, and was produced by the method for producing the one-component polyurethane waterproofing paint of example 1 to prepare a solvent-free one-component polyurethane waterproofing paint.
The results of the measurements are shown in table 1:
the solvent-free and solvent-free single-component polyurethane waterproof paint prepared according to the five embodiments is subjected to performance detection, and the data obtained through detection shows that the addition amount of the epoxypropane butyl ether plays a critical role in the performance of the solvent-free and solvent-free single-component polyurethane waterproof paint, and the addition amount of the epoxypropane butyl ether determines the chain extension degree of the polyurethane at the prepolymerization later stage, so that the molecular structure of the cured polyurethane is influenced, and various performances of the paint after film forming are finally determined. Meanwhile, the low viscosity of the propylene oxide butyl ether influences the overall viscosity of the coating and determines the construction hand feeling of the coating. As can be seen from Table 1, the effect of the addition amount of propylene oxide butyl ether on the prepared solvent-free one-component polyurethane waterproofing paint is as follows: the elongation at break and the volatile organic compound are improved along with the increase of the addition amount of the propylene oxide butyl ether; the rotational viscosity, the acid treatment tensile strength retention rate and the heat treatment tensile strength retention rate are reduced along with the increase of the addition amount; the tensile strength, the tearing strength and the bonding strength are firstly improved and then reduced along with the increase of the addition amount; the change of the addition amount of the propylene oxide butyl ether has little influence on other performances such as low-temperature bending property and the like of the solvent-free single-component polyurethane waterproof coating.
In the six examples, in example 4, the addition amount of the propylene oxide butyl ether is too large, so that the polyurethane chain extension is more, the coating film is softer, and the tearing strength is unqualified; in the embodiment 5, no propylene oxide butyl ether is added, so that the viscosity of the coating is too high and far exceeds the optimal construction viscosity of 6000-8000 mpa.s, the blade coating is difficult, and the elongation at break is unqualified; example 6 the use of 4-tert butyl phenyl glycidyl ether instead of propylene oxide butyl ether, its viscosity increased 4700mpa.s, unfavorable construction, and mechanical properties and acid and alkali resistance were reduced a little, this is because propylene oxide butyl ether is aliphatic type, have better dilution effect than aromatic type, and its ultra-low self viscosity (2mpa.s) and single epoxy structure, dilution effect was more obvious, and the molecule contains ether linkage and epoxy group, and with low viscosity bio-based polyether polyol synthetic polyurethane has good compatibility. Examples 1, 2, 3 meet current national and industrial standards, and are particularly excellent in solids content and volatile organic compound performance. However, by comprehensively considering the use environment, construction hand feeling, production cost, and the like of the solvent-free and solvent-free one-component polyurethane waterproof coating, the comprehensive performance of the solvent-free and solvent-free one-component polyurethane waterproof coating prepared in example 2 is superior to that of the solvent-free and solvent-free one-component polyurethane waterproof coating prepared in examples 1 and 3, the polyurethane waterproof coating in example 2 belongs to the optimal technical scheme, and the prepared solvent-free and solvent-free one-component polyurethane waterproof coating has the best comprehensive performance.
Claims (6)
1. A solvent-free single-component polyurethane waterproof coating is characterized by comprising the following components in parts by weight: 32-45 parts of low-viscosity bio-based polyether polyol, 9-14 parts of siloxane modified isocyanate, 0.3-0.5 part of wetting dispersant, 5-15 parts of talcum powder, 5-10 parts of silica powder, 6-12 parts of titanium dioxide, 10-15 parts of barite powder, 3-5 parts of color paste, 8-14 parts of epoxypropane butyl ether, 0.5-1 part of flatting agent and 0.5-1 part of defoaming agent, and does not contain metal and amine polyurethane catalysts; the viscosity of the low-viscosity bio-based polyether polyol is not more than 100mPa & s; the functionality of the siloxane modified isocyanate is 2.1-2.2.
2. The solvent-free one-component polyurethane waterproofing coating according to claim 1, wherein the low viscosity bio-based polyether polyol is triglyceride epoxy derivative polyether polyol.
3. A process for producing the solvent-free one-component polyurethane waterproofing paint according to claim 1, comprising the steps of:
a. adding low-viscosity bio-based polyether polyol and a wetting dispersant, mixing, and heating to A for stirring;
b. adding talcum powder, silica powder, titanium dioxide and barite powder, and then heating to B for vacuum dehydration;
c. cooling to C, adding siloxane modified isocyanate, heating to D, stirring, cooling to E, and adding propylene oxide butyl ether;
d. and (4) adding a flatting agent and a defoaming agent after dispersing for a period of time at a high speed, stirring, defoaming in vacuum, and discharging.
4. The production process of the solvent-free mono-component polyurethane waterproof coating according to claim 3, wherein A is 100 +/-5 ℃, B is 115 +/-2 ℃, C is 55-60 ℃, D is 85 +/-2 ℃, and E is 70-75 ℃.
5. The process for producing a solvent-free one-component polyurethane waterproofing paint according to claim 3, wherein the step b further comprises a nitrogen gas replacement step.
6. The process for producing a solvent-free one-component polyurethane waterproofing paint according to claim 3, wherein the step c further comprises a step of introducing nitrogen gas.
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| CN111647347B (en) * | 2020-06-22 | 2023-10-31 | 安徽三棵树涂料有限公司 | Low free TDI single-component polyurethane waterproof coating and preparation method thereof |
| CN113372804B (en) * | 2021-05-27 | 2023-01-20 | 锦绣防水科技有限公司 | Single-component polyurethane waterproof paint capable of forming film once and preparation method thereof |
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| CN101724337B (en) * | 2009-12-29 | 2012-07-11 | 浙江工业大学 | Method for preparing alcohol soluble polyurethane coating |
| US8859710B2 (en) * | 2013-03-15 | 2014-10-14 | Jones-Blair Company | Polysiloxane modified polyisocyanates for use in coatings |
| ITUB20150649A1 (en) * | 2015-05-21 | 2016-11-21 | Sarp S R L | POLYURETHANE COMPOSITION |
| US11279840B2 (en) * | 2017-05-24 | 2022-03-22 | Hewlett-Packard Development Company, L.P. | Ink compositions |
| CN109439177A (en) * | 2018-10-19 | 2019-03-08 | 铁科创恒新材料科技有限公司 | A kind of concrete bridge deck no-solvent type polyurethane water-proof paint and preparation method thereof |
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