CN109810623A - A kind of moisture-proof trapping coating of freezer polyurethane and its preparation process - Google Patents
A kind of moisture-proof trapping coating of freezer polyurethane and its preparation process Download PDFInfo
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- CN109810623A CN109810623A CN201910036864.1A CN201910036864A CN109810623A CN 109810623 A CN109810623 A CN 109810623A CN 201910036864 A CN201910036864 A CN 201910036864A CN 109810623 A CN109810623 A CN 109810623A
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Abstract
The present invention relates to a kind of moisture-proof trapping coating of freezer polyurethane and its preparation processes, especially suitable for the waterproof damp proof insulation of heat preservation of refrigeration storage layer, polyurethane waterproof material technical field.Raw material including following parts by weight: 20-70 parts of combined polyether glycols, 10-50 parts of isocyanates, 2-20 parts of plasticizer, 0-0.5 parts of catalyst, 0-2 parts of stabilizers, 10-50 parts of solvents.1), by combined polyether glycol preparation process at 100-120 DEG C, -0.08MPa to -0.1MPa vacuum the following steps are included: remove water 2 hours, and be cooled to 40-60 DEG C；2) plasticizer, solvent, isocyanates, are sequentially added, is reacted 3-4 hours at 60-70 DEG C；3) catalyst, stabilizer, is added, is cooled to room temperature after mixing evenly, discharges.The present invention solidify after coating cohesive force with higher, good mechanical performance, well moisture-proof gas barrier properties, and convenient for construction.
Description
Technical field
The present invention relates to a kind of moisture-proof trapping coating of freezer polyurethane and its preparation processes, especially suitable for heat preservation of refrigeration storage
The waterproof damp proof insulation of layer, polyurethane waterproof material technical field.
Background technique
Freezer (including: freezer, refrigerated depot section, air-conditioned cold store) is mainly used for frozen meat, aquatic products, fruits and vegetables class and other
Food, service life and the energy-saving effect either Freezing room of freezer or high temperature library all with design whether rationally, building whether
Specification etc. is closely bound up.The freezer usually built according to Specification Design, thermal insulation layer is all relatively good, and library temperature is more stable, uses
Service life in 40-50, fluctuates too big phenomenon there is no library temperature, and some freezers built in recent years, using less than ten
Year scraps substantially, even if it is very serious to continue to use its energy consumption situation.
Since the temperature of grim strategy two sides (the inside and outside two sides in library in other words) is different, along with the transmitting of heat, also
It is mobile that wet gas current occurs, the movement of this moisture is called the infiltration of vapor, to block vapor permeation to acquire a certain degree of difficulty.
Even than blocking hot-fluid also difficult, the temperature difference of the two sides of building enclosure will result in the partial pressure difference of vapor, so as to form
The power of vapor permeation.For example the outside (i.e. high temperature side) of freezer is 30 DEG C, steam partial pressure when relative humidity is 60% is
19.09mm mercury column, low temperature side is 0 DEG C, even if relative humidity is 100%, steam partial pressure also only has 4.58mm pump plunger shaft.In this way,
The steam partial pressure of building enclosure two sides is (19.09mm mercury column -4.58mm mercury column).14.51mm mercury column, this than one pressure head are
The common blower of 30-60mm water column is a sizable motive force --- just as this motive force.Vapor can be pressed through
The crack of the Minute pores of building enclosure enters in library, and moisture has exactly been pressed into building enclosure for Freezing room by this point
And insulating layer, totally unfavorable influence is carried out to the library insulation belt.It is just increasingly important especially for air-conditioned cold store, because removing water vapour
It is unfavorable for outside heat preservation into building enclosure, also will cause the variation of gas in library, be unfavorable for the storage of fruits and vegetables.In steam partial pressure
Under the promotion of difference, the vapor outside library will be permeated into library.When inside the vapour barrier of vapor permeation to building enclosure, meet
For cold air to dew point or freezing point temperature (being especially easy to appear in low-temperature cold store), vapor will gap in heat-barrier material and seam
In gap, droplet or ice crystal are condensed into, heat-barrier material is made to make moist and reduce heat-proof quality.Therefore, in order to ensure heat-barrier material holding
Good heat-proof quality, prolongs the service life, and maintains the normal use of freezer, and moisture-proof vapour barrier is arranged just on the surface of thermal insulation layer
It is extremely important, and the relevant technologies that moisture-proof vapor barrier layer is arranged in thermal insulation layer surface are not yet disclosed in currently available technology.
It would therefore be highly desirable to provide a kind of moisture-proof trapping coating of the freezer polyurethane that can solve above-mentioned technical problem and its preparation work
Skill.
Summary of the invention
The present invention provides a kind of coating and preparation method thereof for the moisture-proof trapping of freezer, the coating tool after the paint solidification
There are higher cohesive force, good mechanical performance, well moisture-proof gas barrier properties, and convenient for construction.
A kind of moisture-proof trapping coating of freezer polyurethane, it is characterised in that the raw material including following parts by weight:
20-70 parts of combined polyether glycols, 10-50 parts of isocyanates, 2-20 parts of plasticizer, 0-0.5 parts of catalyst, 0-2 parts steady
Determine agent, 10-50 parts of solvents；
Preferably, the combined polyether glycol is 30-60 parts；
Preferably, the isocyanates is 15-45 parts；
Preferably, the plasticizer is 2-15 parts；
Preferably, the catalyst is 0-0.3 parts；
Preferably, the stabilizer is 0-1 parts；
Preferably, the solvent is 10-40 parts；
Preferably, the isocyanates includes MDI and its oligomer, performed polymer, polymeric MDI, one of liquefied mdi or more
Kind；
Preferably, the isocyanates is methyl diphenylene diisocyanate, liquefaction methyl diphenylene diisocyanate, more phenyl
One of methane polyisocyanates or a variety of mixtures, the methyl diphenylene diisocyanate include 4,4-MDI and 2,4-
Two kinds of isomers of MDI；
Preferably, the combined polyether glycol be using potassium hydroxide as catalyst, or using double metal cyanide as catalyst, with
Propylene glycol, dipropylene glycol or glycerol small molecule polyol are initiator, using propylene oxide or ethylene oxide as polymerized monomer, open loop
It is polymerized；
Preferably, the combined polyether glycol is by one of following five kinds of polyalcohols or a variety of mixing:
The starting of Polyol A glycerol, the polyol of propylene oxide, ethylene oxide, ethylene oxide is random or sealing end is copolymerized, ring
Oxidative ethane content is greater than 50%, and degree of functionality is 3, hydroxyl value 35-56mgKOH/g；
The starting of Polyol B dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content is less than 10%, hydroxyl
Value 50-100 mgKOH/g；
The starting of Polyol C dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content is less than 10%, hydroxyl
Value 100-300 mgKOH/g；
The starting of Polyol D dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content 10-25%, hydroxyl
Value 240-350 mgKOH/g；
Bis- degree of functionality polyether polyol of Polyol E, hydroxyl value 1200-1500 mgKOH/g
Preferably, one of the plasticizer DOP, DBP, KH550, KH560, chlorinated paraffin or a variety of mixing, plasticizer
Include and is not limited to above-mentioned several plasticizer；
Preferably, the catalyst is bis- (dimethylamino ethyl) ethers, N, and N '-dimethyl cyclohexylamine, triethylene diamine, octanoic acid are sub-
One of tin, 2,2- dual-morpholinyl diethyl ether, delayed catalyst or a variety of mixing；
Preferably, the solvent is ethyl acetate, in butyl acetate, acetone, butanone, benzene,toluene,xylene, methylene chloride
One or more mixing；
Preferably, the stabilizer is powdered molecular sieves, p-Methyl benzenesulfonyl isocyanate, chlorobenzoyl chloride, one in defoaming agent
Kind or several mixing；
Preferably, the freezer is 50-2000mPaS with viscosity at 25 DEG C of the moisture-proof trapping coating of polyurethane.
A kind of preparation process of the moisture-proof trapping coating of freezer polyurethane, be characterized in that the following steps are included:
1, combined polyether glycol is removed water 2 hours at 100-120 DEG C, -0.08MPa to -0.1MPa vacuum, and be cooled to
40-60℃；
2, plasticizer, solvent, isocyanates are sequentially added, is reacted 3-4 hours at 60-70 DEG C.
3, catalyst, stabilizer is added, is cooled to room temperature after mixing evenly, discharges.
The moisture-proof trapping coating of freezer polyurethane of the invention, has the advantages that
Coating of the present invention is appropriate to introduce polyether polyol soft segment ingredient, in the case where keeping certain degree of hardness, increases
The toughness of coating is added, can preferably play a protective role；Plasticizer and solvent in this coating make coating in film forming
When have good film forming, can be good at infiltrating with base and form a film, block porous matrix layer, by foam and the moisture of base every
Absolutely, and with polyurethane foam there is good caking property, foam obscission will not be generated；In addition, the coating is as one-component
Moisture curing coating can be with because the selection and addition of stabilizer and catalyst, there is good curing performance and storage stability performance
Guarantee that surface drying time did solid work the time less than 24 hours less than 4 hours, and it is more than half a year that Storage period can be reached.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
A kind of moisture-proof trapping coating of freezer polyurethane, the raw material including following parts by weight:
20-70 parts of combined polyether glycols, 10-50 parts of isocyanates, 2-20 parts of plasticizer, 0-0.5 parts of catalyst, 0-2 parts steady
Determine agent, 10-50 parts of solvents；
Isocyanates includes MDI and its oligomer, performed polymer, polymeric MDI, one of liquefied mdi or a variety of；
Isocyanates is methyl diphenylene diisocyanate, liquefaction methyl diphenylene diisocyanate, more phenylmethane polyisocyanate cyanogen
One of acid esters or a variety of mixtures, the methyl diphenylene diisocyanate include 4,4-MDI and 2, two kinds of isomeries of 4-MDI
Body；
Combined polyether glycol is using potassium hydroxide as catalyst, or using double metal cyanide as catalyst, with propylene glycol, dipropyl
Glycol or glycerol small molecule polyol are initiator, and using propylene oxide or ethylene oxide as polymerized monomer, ring-opening polymerisation is formed；
Combined polyether glycol is by one of following five kinds of polyalcohols or a variety of mixing:
The starting of Polyol A glycerol, the polyol of propylene oxide, ethylene oxide, ethylene oxide is random or sealing end is copolymerized, ring
Oxidative ethane content is greater than 50%, and degree of functionality is 3, hydroxyl value 35-56mgKOH/g；
The starting of Polyol B dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content is less than 10%, hydroxyl
Value 50-100 mgKOH/g；
The starting of Polyol C dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content is less than 10%, hydroxyl
Value 100-300 mgKOH/g；
The starting of Polyol D dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content 10-25%, hydroxyl
Value 240-350 mgKOH/g；
Bis- degree of functionality polyether polyol of Polyol E, hydroxyl value 1200-1500 mgKOH/g
Plasticizer be one of DOP, DBP, KH550, KH560, chlorinated paraffin or a variety of mixing, plasticizer include and and it is unlimited
In above-mentioned several plasticizer；
Catalyst is bis- (dimethylamino ethyl) ethers, N, and N '-dimethyl cyclohexylamine, triethylene diamine, stannous octoate, 2,2- are bis-
One of quinoline base Anaesthetie Ether, delayed catalyst or a variety of mixing；
Solvent is mixed for one or more of ethyl acetate, butyl acetate, acetone, butanone, benzene,toluene,xylene, methylene chloride
It closes；
Stabilizer is mixed for one or more of powdered molecular sieves, p-Methyl benzenesulfonyl isocyanate, chlorobenzoyl chloride, defoaming agent
It closes；
Freezer is 50-2000mPaS with viscosity at 25 DEG C of the moisture-proof trapping coating of polyurethane.
A kind of preparation process of the moisture-proof trapping coating of freezer polyurethane, comprising the following steps:
1, combined polyether glycol is removed water 2 hours at 100-120 DEG C, -0.08MPa to -0.1MPa vacuum, and be cooled to
40-60℃；
2, plasticizer, solvent, isocyanates are sequentially added, is reacted 3-4 hours at 60-70 DEG C.
3, catalyst, stabilizer is added, is cooled to room temperature after mixing evenly, discharges.
Embodiment 1
A kind of moisture-proof trapping coating of freezer polyurethane of the present embodiment, including 16.9 grams of Polyol A and 40 grams of Polyol B
It is removed water 2 hours under 100 DEG C, -0.1MPa environment, 1.1 grams of KH560 and 5.6 gram of chlorinated paraffins (plasticizer) is added, be added 7 grams
14 grams of polyphenyl methane polyisocyanate, liquefaction diphenyl is added in ethyl acetate, 7 grams of butyl acetates, 6 grams of dimethylbenzene (solvent)
It 1.8 grams of methane diisocyanate, is reacted 3 hours under 60 degree, is down to room temperature, 0.01 gram of 2,2- dual-morpholinyl diethyl ether is added
(catalyst), 0.6 gram of powdered molecular sieves, 0.01 gram of chlorobenzoyl chloride (stabilizer), 0.01 gram of defoaming agent, products therefrom viscosity exist
3000-3500mPaS is suitble to brush, adds 20-30 grams of above-mentioned solvent, can reduce viscosity, is suitble to spraying.
Embodiment 2
16.5 grams of Polyol A and 38.7 grams of Polyol B and 1.1 grams of Polyol E, vacuum high-temperature remove water 2 hours, are added 1.1
7 grams of acetone, 6.9 grams of methylene chloride, 6 grams of dimethylbenzene, polyphenyl methane polyisocyanate 15 is added in gram KH560 and 5.5 gram of DOP
Gram, 1.6 grams of methyl diphenylene diisocyanate (MDI-50), reacted 3 hours under 60 degree, be down to room temperature, be added 0.01 gram 2,
2- dual-morpholinyl diethyl ether, 0.6 gram of powdered molecular sieves, 0.01 gram of chlorobenzoyl chloride, 0.01 gram of defoaming agent, products therefrom viscosity exist
3000-3500mPaS is suitble to brush, 20-30 grams of above-mentioned solvent is added, can reduce viscosity, is suitble to spraying.
Embodiment 3
48.4 grams of Polyol C vacuum high-temperatures remove water 2 hours, are added 1.5 grams of KH560 and 7.3 gram of DBP, 7 grams of ethyl acetate of addition,
18 grams of polyphenyl methane polyisocyanate, methyl diphenylene diisocyanate is added in 7 grams of butyl acetate, 6.3 grams of dimethylbenzene
(MDI-50) 1.8 grams, 1.8 grams of methyl diphenylene diisocyanate of liquefaction, react 3 hours under 60 degree, are down to room temperature, are added
0.01 gram of N, N '-dimethyl cyclohexylamine, 0.7 gram of p-Methyl benzenesulfonyl isocyanate, 0.01 gram of chlorobenzoyl chloride, products therefrom viscosity
In 2000-3000mPaS, it is suitble to brush.20-30 parts by weight solvent is added, viscosity can be reduced, is suitble to spraying.
Embodiment 4
32.2 grams of Polyol D vacuum high-temperatures remove water 2 hours, are added 1 gram of KH560 and 6.4 gram of DICP, 7 grams of methylene chloride of addition,
30 grams of polyphenyl methane polyisocyanate, methyl diphenylene diisocyanate (MDI- is added in 7 grams of butyl acetate, 6.3 grams of butanone
50) 5 grams, 5 grams of methyl diphenylene diisocyanate of liquefaction, react 3 hours under 60 degree, are down to room temperature, and 0.01 gram of three second is added
Alkene diamines, 0.6 gram of p-Methyl benzenesulfonyl isocyanate, 0.01 gram of chlorobenzoyl chloride, products therefrom viscosity in 2000-3000mPaS,
It is suitble to brush.30-60 grams of above-mentioned solvent is added, viscosity can be reduced, is suitble to spraying.
Table 1: the effect comparison table of embodiment 1-4.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of moisture-proof trapping coating of freezer polyurethane, it is characterised in that the raw material including following parts by weight:
20-70 parts of combined polyether glycols, 10-50 parts of isocyanates, 2-20 parts of plasticizer, 0-0.5 parts of catalyst, 0-2 parts steady
Determine agent, 10-50 parts of solvents.
2. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The combined polyether glycol is 30-60 parts；
The isocyanates is 15-45 parts；
The plasticizer is 2-15 parts；
The catalyst is 0-0.3 parts；
The stabilizer is 0-1 parts；
The solvent is 10-40 parts.
3. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The isocyanates includes MDI and its oligomer, performed polymer, polymeric MDI, one or more of liquefied mdi.
4. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The isocyanates is that methyl diphenylene diisocyanate, liquefaction methyl diphenylene diisocyanate, more phenylmethanes are more
One of isocyanates or a variety of mixtures.
5. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The combined polyether glycol be using potassium hydroxide as catalyst, or using double metal cyanide as catalyst, with propylene glycol,
Dipropylene glycol or glycerol small molecule polyol are initiator, using propylene oxide or ethylene oxide as polymerized monomer, ring-opening polymerisation and
At.
6. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The combined polyether glycol is by one of following five kinds of polyalcohols or a variety of mixing:
The starting of Polyol A glycerol, the polyol of propylene oxide, ethylene oxide, ethylene oxide is random or sealing end is copolymerized, ring
Oxidative ethane content is greater than 50%, and degree of functionality is 3, hydroxyl value 35-56mgKOH/g；
The starting of Polyol B dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content is less than 10%, hydroxyl
Value 50-100 mgKOH/g；
The starting of Polyol C dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content is less than 10%, hydroxyl
Value 100-300 mgKOH/g；
The starting of Polyol D dipropylene glycol, the polyol of propylene oxide, ethylene oxide, ethylene oxide content 10-25%, hydroxyl
Value 240-350 mgKOH/g；
Bis- degree of functionality polyether polyol of Polyol E, hydroxyl value 1200-1500 mgKOH/g.
7. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The plasticizer is one of DOP, DBP, KH550, KH560, chlorinated paraffin or a variety of mixing；
The catalyst is bis- (dimethylamino ethyl) ethers, N, N '-dimethyl cyclohexylamine, triethylene diamine, stannous octoate, 2,2-
One of dual-morpholinyl diethyl ether, delayed catalyst or a variety of mixing.
8. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
The solvent is one of ethyl acetate, butyl acetate, acetone, butanone, benzene,toluene,xylene, methylene chloride or several
Kind mixing；
The stabilizer is one or more of powdered molecular sieves, p-Methyl benzenesulfonyl isocyanate, chlorobenzoyl chloride, defoaming agent
Mixing.
9. the moisture-proof trapping coating of a kind of freezer polyurethane described in accordance with the claim 1, it is characterised in that:
With the moisture-proof trapping coating of polyurethane, the viscosity at 25 DEG C is 50-2000mPaS to the freezer.
10. according to a kind of preparation work of the moisture-proof trapping coating of freezer polyurethane described in claim 1-9 any claim
Skill, it is characterised in that the following steps are included:
1) combined polyether glycol is removed water 2 hours at 100-120 DEG C, -0.08MPa to -0.1MPa vacuum, and is cooled to
40-60℃；
2) plasticizer, solvent, isocyanates, are sequentially added, is reacted 3-4 hours at 60-70 DEG C；
3) catalyst, stabilizer, is added, is cooled to room temperature after mixing evenly, discharges.
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| CN114276747A (en) * | 2022-01-06 | 2022-04-05 | 江苏凯伦建材股份有限公司 | Ultralow-temperature-resistant easy-construction single-component polyurethane waterproof coating and preparation method thereof |
| CN116285638A (en) * | 2022-12-23 | 2023-06-23 | 北京东方雨虹防水技术股份有限公司 | Drinking water-level solvent-free single-component polyurethane waterproof coating and preparation method thereof |
| WO2023194225A1 (en) | 2022-04-06 | 2023-10-12 | Basf Se | Polyurethane composition for vapor barrier in the building with low indoor temperature |
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