CN104087147A - Monocomponent polyurethane waterproof paint and preparation method thereof - Google Patents

Abstract

The invention provides a monocomponent polyurethane waterproof paint and a preparation method thereof. The monocomponent polyurethane waterproof paint comprises the following components in parts by weight: 200 to 300 parts of polyether polyol, 100 to 200 parts of toluene diisocyanate (TDI), 60 to 100 parts of organic solvent, 240 to 400 parts of filling material, 30 to 50 parts of defoaming agent, 200 to 250 parts of plasticizer, 50 to 80 parts of dispersing agent and 5 to 10 parts of catalyst. The monocomponent polyurethane waterproof paint is nontoxic, free of pollution, high in curing speed, short in construction period, low in cost and good in paintcoat performance.

Description

A kind of one-component polyurethane waterproof coating and preparation method thereof

technical field

The invention relates to a coating, in particular to a one-component polyurethane waterproof coating and a preparation method thereof.

Background technique

Polyurethane waterproof coating has become one of the fastest-growing varieties in the global coating industry in the past ten years due to its excellent product performance and processing diversity. The average annual growth rate of polyurethane in foreign countries has reached twice the average growth rate of the coatings industry. In my country, the annual output of polyurethane coatings has exceeded 200,000 tons, accounting for about 8-10% of the total production of coatings in the country. The 3rd place in the total amount of paint.

At present, polyurethane waterproof coatings have been widely recognized and applied in the waterproof industry because of their superior physical and chemical properties. Polyurethane waterproof coatings can be divided into one-component and two-component, both of which are asphalt-based environmental protection materials. The two components are usually divided into two groups, A and B. The A component is a giant urethane prepolymer containing a diisocyanate group (-NOC) made by polymerization of polyether resin and diisocyanate and other raw materials; The components are processed by mixing adhesives, accelerators, tougheners, tackifiers, antifungal agents, fillers and diluents. Two-component polyurethane waterproof coatings often use carcinogenic 3,3'-dichloro-4,4'-diaminodiphenylmethane as a curing agent, and contain a large amount of organic solvents, which are quite harmful to health and the environment. One-component is made by mixing polyether for dehydration, adding diisocyanate and various additives for epoxy modification. The construction of one-component polyurethane waterproof coating is relatively simple, does not require mixing and stirring, and does not increase viscosity before painting, which has certain advantages. There are many kinds of single-component polyurethane waterproof coatings abroad, and their physical properties are basically the same as those of two-component products. The one-component polyurethane waterproof coating produced by the US "Chuanggao" company is one of them. Although the existing solvent-free one-component asphalt-based polyurethane waterproof coating avoids the problem of troublesome construction of two-component coatings, it still poses a threat to environmental protection because it is based on asphalt-based coatings. In addition, the existing one-component waterproof coating is cured by moisture absorption, and the curing time is long. Bubbles are easily generated inside the thick coating, thereby affecting the waterproof effect.

Contents of the invention

The purpose of the present invention is to provide a non-toxic, non-polluting, fast curing speed, short construction period, low cost, excellent coating performance of one-component polyurethane waterproof coating and its preparation method.

In order to solve the above problems, the present invention adopts the following technical solutions: a single-component polyurethane waterproof coating, comprising the following components in parts by weight: 200-300 parts of polyether polyol, 100-200 parts of toluene diisocyanate (TDI) 60-100 parts of organic solvent, 240-400 parts of filler, 30-50 parts of defoamer, 200-250 parts of plasticizer, 50-80 parts of dispersant, and 5-10 parts of catalyst.

The polyether polyol is a mixture of polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) in a ratio of 8:1-10:1;

Described toluene diisocyanate (TDI) contains two isomers of 2,4 toluene diisocyanate and 2,6 toluene diisocyanate, adopts 80/20 isomerization ratio as raw material, its ratio control Within 8%.

The organic solvent is one of toluene, xylene and acetone or a mixture of two or more in any proportion.

The filler is one of light calcium carbonate, heavy calcium carbonate, talcum powder, kaolin, and quartz powder with a particle size of 600-800 meshes or a mixture of two or more in any proportion.

The catalyst is any one of stannous octoate, dibutyltin dilaurate and dibutyltin diacetate, or a mixture of two or more in any proportion.

Described defoamer is silicone defoamer.

The one-component polyurethane waterproof coating of the present invention may also include 10-50 parts of a curing agent, and the curing agent is an oxazolidine latent curing agent.

The single-component polyurethane waterproof coating of the present invention can also include 30-50 parts of pigments, and the pigments are any of iron oxide, chromium oxide green, lemon yellow, medium chrome yellow, lithopone, ultramarine blue, phthalocyanine blue, and carbon black. A sort of.

In order to enhance the flame-retardant effect of the waterproof coating of the present invention, a certain amount of flame-retardant can also be added. The flame retardant may be a halogen flame retardant, a phosphorus flame retardant, an inorganic flame retardant or a nitrogen flame retardant.

The preparation method of single-component polyurethane waterproof coating of the present invention is:

(1) Add polyether polyol to plasticizer and dispersant, stir evenly and heat to 75°C-80°C;

(2) Slowly add fillers and pigments, stir evenly, heat up to 115°C-120°C, and dehydrate for 2.5h under vacuum-0.08MPa--0.09MPa;

(3) Add 2/3 of the organic solvent after dehydration and cool down to 75°C-80°C, then add TDI and stir for 2-2.5 hours at normal pressure and 80°C-85°C;

(4) Add catalyst, defoamer and curing agent, stir evenly and keep warm at 105°C-110°C for 1.5h;

(5) Cool down to 70°C-80°C, add the remaining organic solvent, stir for 20 minutes, then cool and discharge.

Mix the single-component polyurethane waterproof coating of the present invention evenly, weigh an appropriate amount of samples, and evenly brush on the mold coated with the release agent with a scraper, and finish coating in 2 to 3 times, so that the final coating film thickness is about 1.5mm, each scraping should be done after the surface of the last coating is dry. After the last painting, place it at (23±2)℃, relative humidity 65%±15% (standard condition) for 7 days and then test according to the standard. The results show that the tensile strength of the one-component polyurethane waterproof coating of the present invention reaches 5-22Mpa, the elongation at break is greater than 200%, and the waterproof coating is suitable for various environments and can be directly applied. The invention is especially suitable for waterproof and explosion-proof applications in the middle of the cable. After the waterproof coating of the invention is applied to the middle joint of the cable, the failure rate of water ingress is significantly reduced. The waterproof and explosion-proof effects are very ideal, and when the middle head fails It will not produce a combustion-supporting effect, and has little impact on the surrounding cable lines.

The present invention has following beneficial effects:

(1) By rationally adjusting the mass ratio of polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330), the coating has good tensile strength and elongation at break.

(2) Strictly control the mass fraction of NCO in the system, too high can increase the crosslinking density and solvent resistance of the coating film, and the tensile strength is also high, but the coating film is hard, brittle, not impact resistant, and has a small elongation. If the coating film is too low, it will be soft and sticky, the tensile strength will be low, and the water resistance and chemical resistance will decrease. Therefore, the present invention ensures that the coating has good physical properties and chemical storage stability. Skinning phenomenon.

(3) By adding an appropriate amount of plasticizer, the low-temperature flexibility of the coating is improved, the solid content of the coating is reduced, and the workability of the coating is improved.

(4) The present invention can form a film under the condition of -14°C-40°C, the surface dry time is less than 4 hours, the hard drying time is less than 8 hours, and the film surface is relatively smooth after film formation.

Detailed ways

Embodiment 1. A kind of one-component polyurethane waterproof paint, comprises the component of following weight part:

200 parts of a mixture of polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) in a ratio of 8:1, 100 parts of toluene diisocyanate (TDI), 60 parts of organic solvent, 240 parts of filler, 30 parts of defoamer, 200 parts of plasticizer, 50 parts of dispersant, and 5 parts of catalyst.

The preparation method is:

(1) Add polyether polyol to plasticizer and dispersant, stir evenly and heat to 75°C-80°C;

(2) Slowly add fillers and pigments, stir evenly, heat up to 115°C-120°C, and dehydrate for 2.5h under vacuum-0.08MPa--0.09MPa;

(3) Add 2/3 of the organic solvent after dehydration and cool down to 75°C-80°C, then add TDI and stir for 2-2.5 hours at normal pressure and 80°C-85°C;

(4) Add catalyst, defoamer and curing agent, stir evenly and keep warm at 105°C-110°C for 1.5h;

(5) Cool down to 70°C-80°C, add the remaining organic solvent, stir for 20 minutes, then cool and discharge.

Embodiment 2. A kind of one-component polyurethane waterproof coating, comprises the component of following parts by weight: polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) mix according to the ratio of 10:1 Mixture 300 parts, TDI 200 parts, organic solvent 100 parts, filler 400 parts, defoamer 50 parts, plasticizer 250 parts, dispersant 80 parts, catalyst 10 parts.

The preparation method is the same as in Example 1.

Embodiment 3. A kind of one-component polyurethane waterproof coating, comprises the component of following parts by weight: polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) mix according to the ratio of 9:1 250 parts of mixture, 150 parts of TDI, 70 parts of organic solvent, 300 parts of filler, 40 parts of defoamer, 230 parts of plasticizer, 60 parts of dispersant, and 8 parts of catalyst.

The preparation method is the same as in Example 1.

Embodiment 4. A kind of one-component polyurethane waterproof coating, comprises the component of following parts by weight: polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) mix according to the ratio of 8:1 210 parts of mixture, 160 parts of TDI, 80 parts of organic solvent, 400 parts of filler, 50 parts of defoamer, 210 parts of plasticizer, 70 parts of dispersant, 9 parts of catalyst, and 30 parts of curing agent.

The preparation method is the same as in Example 1.

Embodiment 5. A kind of one-component polyurethane waterproof coating, comprises the component of following weight portion: polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) mix according to the ratio of 9:1 220 parts of mixture, 170 parts of TDI, 90 parts of organic solvent, 300 parts of filler, 40 parts of defoamer, 240 parts of plasticizer, 90 parts of dispersant, 9 parts of catalyst, 30 parts of curing agent, and 40 parts of pigment.

The preparation method is the same as in Example 1.

Embodiment 6. A kind of one-component polyurethane waterproof coating, comprises the component of following parts by weight: polyoxypropylene diol (N-220) and polyoxypropylene triol (N-330) mix according to the ratio of 10:1 3000 parts of mixture, 200 parts of TDI, 80 parts of organic solvent, 300 parts of filler, 40 parts of defoamer, 240 parts of plasticizer, 90 parts of dispersant, 9 parts of catalyst and 30 parts of pigment.

The preparation method is the same as in Example 1.

Claims (10)

1. a mono-composition poyurethane water-proof paint, it is characterized in that, comprise the component of following weight part: polyether glycol 200-300 part, toluene-2,4-diisocyanate 100-200 part, organic solvent 60-100 part, filler 240-400 part, defoamer 30-50 part, softening agent 200-250 part, dispersion agent 50-80 part, catalyzer 5-10 part.

2. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, described polyether glycol is the mixture that polyoxypropyleneglycol and polyoxytrimethylene triol mix according to 8:1-10:1 ratio.

3. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, described toluene-2,4-diisocyanate is containing 2,4 toluene-2,4-diisocyanates and 2,6 two kinds of toluene-2,4-diisocyanates isomer, adopt 80/20 isomery to be compared to raw material, and its ratio control is in 8%.

4. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, described organic solvent is the mixture that one or more arbitrary proportions in toluene, dimethylbenzene, acetone mix.

5. mono-composition poyurethane water-proof paint as claimed in claim 1, it is characterized in that, described filler is the mixture that one or more arbitrary proportions in granularity 600～800 object light calcium carbonates, water-ground limestone, talcum powder, kaolin, silica powder mix.

6. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, described catalyzer is the mixture that any one or the two or more arbitrary proportion in stannous octoate, dibutyl tin laurate, diacetate dibutyl tin mixes.

7. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, described defoamer is silicone antifoam agent.

8. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, can also comprise solidifying agent 10-50 part, described solidifying agent Wei oxazolidine latent curing agent.

9. mono-composition poyurethane water-proof paint as claimed in claim 1, is characterized in that, can also comprise pigment 30-50 part, and described pigment is any one in ferric oxide, chromoxide green, lemon yellow, medium chrome yellow medium yellow, zinc sulfide white, ultramarine, pthalocyanine blue, carbon black.

10. described in claim 1, the preparation method of mono-composition poyurethane water-proof paint is:

(1) polyether glycol is added to stir post-heating to 75 DEG C-80 DEG C of softening agent, dispersion agent;

(2) slowly add filler, pigment, be warming up to 115 DEG C-120 DEG C after stirring, 2.5h dewaters under vacuum-0.08MPa--0.09MPa condition;

(3) after dehydration, add 2/3 organic solvent while cooling to 75 DEG C-80 DEG C, then add TDI stirring reaction 2-2.5h at normal pressure and 80 DEG C of-85 DEG C of temperature;

(4) add again catalyzer, defoamer, solidifying agent, stir and at 105 DEG C of-110 DEG C of insulation reaction 1.5h;

(5) be cooled to 70 DEG C-80 DEG C, add residue organic solvent, cooling discharging after stirring 20min.