CN113502121A

CN113502121A - Palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating and preparation method thereof

Info

Publication number: CN113502121A
Application number: CN202110880845.4A
Authority: CN
Inventors: 李鹤; 李小亮; 白志欣; 张志功; 徐伟
Original assignee: Fujian Sankeshu New Material Co ltd
Current assignee: Fujian Sankeshu New Material Co ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2021-10-15
Anticipated expiration: 2041-08-02
Also published as: CN113502121B

Abstract

The invention relates to a palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating and a preparation method thereof, and the palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating is prepared from the following components in parts by weight: 2-functionality polyether polyol, 3-functionality polyether polyol, a plant-based plasticizer, talcum powder, heavy calcium powder, diphenylmethane diisocyanate, organic bismuth, dearomatized solvent oil, an organic silicon defoamer and an imine latent curing agent. The waterproof coating obtained by the invention is measured according to GB/T19250-2013I type standard, and the tensile property and mechanical property after coating are determined, so that the waterproof coating meets the standard requirements. According to the test of the JC/T1066-2008 method, the product detection of the invention can pass the A-type standard requirements. The surface drying time of the product is 5-6h, the actual drying time is 12-14h, the requirement of the national standard is far exceeded, the coating is compact, the waterproof effect is excellent, and the storage at 30 ℃ is more than 1 year.

Description

Palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating and preparation method thereof

Technical Field

The invention relates to a palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating and a preparation method thereof.

Background

Polyurethane waterproof coatings were first developed and used in the united states, and were produced by introducing the united states technology in japan in 1964. The industrial production of polyurethane is started in the early stage of the 20 th century in China, and the polyurethane material is applied to the waterproof coating in the early 80 th, so that the polyurethane waterproof coating has good environment adaptability. When it is contacted with the moisture in the air, it can be solidified, so that a seamless integral anti-film is formed on the surface of the base layer, the tensile strength of the coating film is high, the flexibility is strong, and the base layer can not be affected even if it is cracked and stretched, so that the adaptability is strong, and the anti-water coating film is shown according to the viscosity development report of the water-proofing association: in 2019, the total yield of the building waterproof material is expected to reach 24.2 hundred million square meters, and the same-proportion growth rate is expected to be 9.4%. The waterproof coating accounts for 28.09%, and the polyurethane waterproof coating accounts for 30.26% of the total amount of the waterproof coating. The demand for waterproof coatings is growing and is enormous. JC/T500-92 polyurethane waterproof coating industry standard is implemented in 1993, 4 and 1, and the standard is suitable for a two-component polyurethane waterproof coating and mainly takes tar modification. However, tar type waterproof paint has pungent smell, contains a large amount of volatile harmful toxicants, and seriously pollutes and harms human health. With the development of socioeconomic and the enhancement of environmental consciousness and the advancement of technology, the call for prohibiting the use of tar polyurethane waterproofing paint has been stronger and the national ministry of construction has made a limit in 1998 and has gradually prohibited the decision to use coal tar in polyurethane waterproofing paint. GB/T19250-2003 polyurethane waterproof paint national standard is formally implemented from 3.1.2004. At the moment, the low-price chlorinated paraffin plasticizer enters the polyurethane waterproof industry until GB/T19250-2013 polyurethane waterproof paint is implemented, short-chain or medium-chain chlorinated paraffin (SCCPs) or a mixture thereof becomes the most main plasticizer in the whole polyurethane waterproof industry, the addition amount in the formula accounts for 15-35% of the proportion of the formula, the plasticizer almost covers the whole industry, and the addition amount is very large. Phthalate plasticizers are also commonly used in the industry, are high in migration, can be easily released from products, can enter human bodies through respiratory tracts, digestive tracts, skins and other ways, have endocrine disrupting characteristics similar to hormones, have reproductive toxicity, can disrupt endocrine, affect reproduction and development, and are also harmful substances. The common plasticizer also comprises a terephthalate plasticizer, and the application is less in the industry due to higher price. There is a new class of bio-based plasticizers, but bio-based materials are unstable in source due to problems such as production area, climate and environment, and the quality after processing is unstable, and the price is slightly high.

Disclosure of Invention

The invention provides a palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating and a preparation method thereof. According to the test of the JC/T1066-2008 method, the product detection of the invention can pass the A-type standard requirements. The surface drying time of the product is 5-6h, the actual drying time is 12-14h, the requirement far exceeds the national standard, the coating is compact, the mechanical property is excellent, and the storage at 30 ℃ is detected to be more than 1 year.

The invention is realized by the following technical scheme:

the palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating is prepared from the following components in parts by weight:

further, 2-functionality polyether polyol, 3-functionality polyether polyol, a plant-based plasticizer, talcum powder and coarse whiting powder are put into a negative pressure reaction kettle, then the stirring speed is set to be 300-plus 500r/min (the stirring speed is kept in the following steps), and then the reaction is carried out for draining for 2-4h at the temperature of 115-plus 125 ℃ and the pressure of-0.09-0.1 Mpa;

then closing the negative pressure, adding diphenylmethane diisocyanate at the temperature of 60-70 ℃, and then preserving the heat for 2-4h at the temperature of 65-75 ℃;

then adding organic bismuth at the temperature of 65-75 ℃ and preserving heat for 25-35 min;

then adding dearomatized solvent oil, organosilicon defoaming agent and imine latent curing agent at 60-70 deg.C, and keeping the temperature for 20-40 min;

and maintaining at-0.03-0.05 mpa for 5-15min, cooling to 45-55 deg.C, and packaging in a sealed can.

The polyurethane waterproof coating mainly comprises isocyanate, polyether glycol, a liquid plasticizer, inorganic powder and a small amount of functional additives, and the environment-friendly effect is greatly improved compared with that of a petroleum-based plasticizer by adopting a palm-based plasticizer. The source is wider, and the palm oil contains more saturated fatty acid. The polyurethane curing agent has the advantages of good stability, difficult oxidation and deterioration, high smoke point, lower price compared with other bio-based materials, adoption of a special processing technology, weak acidity (PH5-6) of the plasticizer PH, good neutralization of storage risks caused by latent curing agents in a polyurethane system, and good stability.

The latent curing agent component contained in the system can react with water molecules quickly to produce a multifunctional product containing active hydrogen. The use in polyurethane systems avoids the generation of carbon dioxide and promotes complete cure. Preferentially react with water molecules, so that the reaction probability of the water molecules and isocyanate is reduced, and the generation of bubbles, pinholes and whitening of the film layer caused by the influence of moisture is prevented. Meanwhile, the generated active hydrogen product is crosslinked with isocyanate, so that the shrinkage of the film layer is effectively reduced, and the tensile elongation, toughness, water resistance and weather resistance of the film layer can be improved. However, storage stability is often impaired due to rapid reaction, particularly in summer. The technology adopts the palm oil-based plasticizer with a certain proportion, the dispensing system becomes weak acid, the storage period of the system is kept to be prolonged, and meanwhile, the drying speed of a paint film is not influenced.

Compared with the prior art, the invention has the following beneficial effects: the waterproof coating obtained by the method has the tensile property and mechanical property after coating according to GB/T19250-2013I standard, and meets the standard requirements.

According to the test of the JC/T1066-2008 method, the product detection of the invention can pass the A-type standard requirements.

The surface drying time of the product is 5-6h, the actual drying time is 12-14h, the requirement of the national standard is far exceeded, the coating is compact, the waterproof effect is excellent, and the storage at 30 ℃ is more than 1 year.

Detailed Description

The invention will be further elucidated with reference to the following embodiments:

example 1

further, putting 2-functionality polyether polyol, 3-functionality polyether polyol, a plant-based plasticizer, talcum powder and heavy calcium powder into a negative pressure reaction kettle, setting the stirring speed to be 300r/min, and then carrying out reaction and drainage for 2 hours at the temperature of 115 ℃ and the pressure of-0.09 Mpa;

then closing the negative pressure, adding diphenylmethane diisocyanate at the temperature of 60 ℃, and then preserving heat for 2 hours at the temperature of 65 ℃;

then adding organic bismuth at the temperature of 65 ℃ and preserving heat for 25 min;

then adding dearomatization solvent oil, an organic silicon defoaming agent and an imine latent curing agent at the temperature of 60 ℃ and preserving heat for 20 min;

example 2

a preparation method of a palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating comprises the following steps:

putting 2-functionality polyether polyol, 3-functionality polyether polyol, a plant-based plasticizer, talcum powder and heavy calcium carbonate powder into a negative pressure reaction kettle, setting the stirring speed to be 500r/min, and then carrying out reaction at the temperature of 125 ℃ and the pressure of-0.1 Mpa for draining water for 4 hours;

then closing the negative pressure, adding diphenylmethane diisocyanate at the temperature of 70 ℃, and then preserving the heat for 4 hours at the temperature of 75 ℃;

then adding organic bismuth at the temperature of 75 ℃ and preserving heat for 35 min;

then adding dearomatization solvent oil, an organic silicon defoaming agent and an imine latent curing agent at 70 ℃ and preserving heat for 40 min;

and maintaining at-0.05 mpa for 15min, cooling to 45 deg.C, and packaging in a sealed container.

Example 3

putting 2-functionality polyether polyol, 3-functionality polyether polyol, a plant-based plasticizer, talcum powder and heavy calcium carbonate powder into a negative pressure reaction kettle, setting the stirring speed to be 400r/min, and then carrying out reaction at the temperature of 120 ℃ and the pressure of-0.095 Mpa for draining water for 3 hours;

then closing the negative pressure, adding diphenylmethane diisocyanate at the temperature of 65 ℃, and then preserving the heat for 3 hours at the temperature of 70 ℃;

then adding organic bismuth at the temperature of 70 ℃ and preserving heat for 30 min;

then adding dearomatization solvent oil, an organic silicon defoaming agent and an imine latent curing agent at 65 ℃ and keeping the temperature for 30 min;

and maintaining at-0.04 mpa for 10min, cooling to 55 deg.C, and packaging in a sealed container.

Through detection, the surface of the product of the embodiment 1-3 is dried for 5-6h, and the actual drying time is 12-14h, which far exceeds the national standard requirement, and the coating is compact, the waterproof effect is excellent, and the storage at 30 ℃ is more than 1 year.

The waterproof coating of the embodiment is measured according to GB/T19250-2013I type standard, the tensile property and mechanical property after coating meet the standard requirements, and the result is shown in Table 1:

Table 1 results of performance testing of examples 1-3

When the waterproof coating of the embodiment is tested according to the JC/T1066-2008 method, the product of the invention can pass the A-class standard requirements, and the results are shown in Table 2:

table 2 waterproof property test results of the waterproof coatings of examples 1 to 3

Item	Watch stem (h)	Nut stem (h)	Impermeability (0.3MP,120min)
				Example 1	6	14	Is impervious to water
Example 2	5	12	Is impervious to water
				Example 3	6	13	Is impervious to water

In the above embodiments of the present invention, the preferred sources of the components are as follows: the 2-functionality polyether polyol is WANOL C2020 of Wanhua chemical group GmbH, the 3-functionality polyether polyol is WANOL F3135 of Wanhua chemical group GmbH, the plant-based plasticizer is commercially available plant-based epoxy fatty acid methyl ester, the talcum powder is commercially available 800-mesh talcum powder, the heavy calcium powder is commercially available 1000-mesh heavy calcium carbonate, and the diphenylmethane diisocyanate is WANOL F3135 of Wanhua chemical group GmbH

MDI-50, the catalyst is organic bismuth catalyst DY-5350 of Shanghai Desheng chemical company Limited, the defoaming agent is a commercially available 100% organic silicon defoaming agent, and the imine latent curing agent is Incozol BH proxied by Shanghai Hongxiang chemical industry International trade company Limited.

Claims

1. A palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating is characterized in that: the composition is prepared from the following components in parts by mass:

2. the palm oil-based plasticizer latent curing type one-component polyurethane waterproof coating material as claimed in claim 1, wherein: the plant-based plasticizer is plant-based epoxy fatty acid methyl ester.

3. The preparation method of the palm oil-based plasticizer latent curing type single-component polyurethane waterproof coating material as claimed in claim 1, wherein the preparation method comprises the following steps: the method comprises the following steps:

putting 2-functionality polyether polyol, 3-functionality polyether polyol, a plant-based plasticizer, talcum powder and heavy calcium powder into a negative pressure reaction kettle, setting the stirring speed at 300-0 r/min, and then carrying out reaction and drainage for 2-4h at the temperature of 115-125 ℃ and the pressure of-0.09-0.1 Mpa;