CN109021805A - A kind of difunctional polyester resin and preparation method thereof - Google Patents
A kind of difunctional polyester resin and preparation method thereof Download PDFInfo
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- CN109021805A CN109021805A CN201810667544.1A CN201810667544A CN109021805A CN 109021805 A CN109021805 A CN 109021805A CN 201810667544 A CN201810667544 A CN 201810667544A CN 109021805 A CN109021805 A CN 109021805A
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- polyester resin
- hydroxyl
- powdery paints
- telechelic polyester
- wood grain
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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
- C09D175/06—Polyurethanes from polyesters
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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
- C09D5/03—Powdery paints
Abstract
The invention discloses a kind of powdery paints difunctional polyester resin, the polyester resin has carboxyl end group and terminal hydroxy group Liang Zhong functional group, its acid value is 20-45mgKOH/g, hydroxyl value is 15-45mgKOH/g, 200 DEG C of viscosity are 2600-5200mPas, number-average molecular weight is 3000-4500, glass transition temperature is 61-69 DEG C, is mainly formed by the group lease making melt polymerization of following molar content: dihydric alcohol 44-55mol%, binary acid 40-46mol%, branching agent 0.1-3.Omol%, acidolysis agent 4-15mol%, esterification catalyst 0.01-0.1mol%.The polyester resin possesses comprehensive performance outstanding in terms of flow leveling, mechanical performance, weather resistance, water boiling resistance performance, heat resistance, solvent resistance and thermal transfer.Also disclose the preparation method of above-mentioned powdery paints difunctional polyester resin.
Description
Technical field
The invention belongs to polyester resin technical fields, and in particular to a kind of environmentally protective surface functional material and its preparation
Method.
Background technique
Powdery paints is efficient with its, pollution-free and the advantages that saving the energy is widely used in household electrical appliances, automobile, office are used
The fields such as tool, steel and building.Currently, polyester resin for powder coating is divided into terminal carboxyl polyester resin and hydroxyl telechelic polyester tree
Rouge.For terminal carboxyl polyester resin using the solidification such as TGIC, T-105 and epoxy, hydroxyl telechelic polyester resin is solid using blocked isocyanate
Change.The polyester resin of two kinds of systems respectively has advantage, and comprehensive performance is more flat after terminal carboxyl polyester resin and curing agent film-forming
Weighing apparatus, price is lower, widely applicable；And hydroxyl telechelic polyester resin is using having splendid levelability, resistance to after cured with isocyanates
The outstanding properties such as solvent borne and weatherability, but it is limited by the influence of the factors such as price, polyester resin master currently used in the market
Want still terminal carboxyl polyester resin.
However, and individually holding carboxylic as the improvement of people's living standards, require the comprehensive performance of coating also higher and higher
All more or less there is partial properties defect in base polyester resin or hydroxyl telechelic polyester.Thus how break-through skill bottleneck, develop it is comprehensive
Closing the polyester resin haveing excellent performance just is particularly important.
CN106633012A discloses a kind of thermal transfer polyester resin for powder coating and preparation method thereof, proposes the polyester
Resin with more preferable levelling and while mechanical performance, has better thermal transfer effect, but since its acidolysis agent is whole
Using trimellitic anhydride, weatherability is bad, is not suitable for outdoor transfer product.CN106046336A discloses a kind of with hydroxyl
Water-soluble polyester resin of acid blocked and preparation method thereof uses polyester carboxyl end group prepolymer and end-capping reagent hydroxyl acrylic monomer
It carries out sealing end and obtains water-soluble polyester resin.But the process is more complicated due to it, not easy to control, and its be primarily directed to it is aqueous
In terms of polyester resin, it is not suitable for art of powder coatings.
Powdery paints coating and can form coating in the form of powder particle, start from early 1940s.Powdery paints tool
Have the advantage that first is that, production and coating process in there is no solvent release, it is low in the pollution of the environment, meet environmental requirement；Second is that
The powder sprayed and spoiled in coating process can save resource with recycling and reusing；Third is that powder coating easily realizes automated production,
Production efficiency can be improved.Due to above, powdery paints and coating have become the coating new product and new process quickly grown,
Become generally acknowledge meet 4E type coating products.
Common powdery paints has epoxy powder coating, epoxy polyester mixed type powder paint, polyester TGIG powder
Coating and polyurethane powder coating etc..Polyurethane powder coating is mainly made of curing agent, sealer and polyol resin, wherein
Curing agent mostly uses inner sealing type polyisocyanates, and the polyol resin overwhelming majority selects polyester resin.Polyurethane powder applies
Material has blocked polyurethane powdery paints (polyester-urethane type powdery paints, acrylic-urethane powdery paints)
And UV curing powder coating.
Blocked polyurethane system can be divided into blocked polyisocyanates and closing prepolymer again.Its principle is to utilize certainization
Closing object to react the ammonia ester bond of generation with polyisocyanates is stable at processing temperatures, it is sufficient to guarantee that polyisocyanates will not be with
Compound containing reactive hydrogen reacts.But the thermal stability of this ammonia ester bond is limited, when temperature is higher than 150 DEG C, solution
Closing releases-NCO group, generates the high urethane bonds of thermal stability with the reactive with active hydrogen in compound rapidly.
Aluminum profile needs superpower weatherability and dicoration so that aluminium shape surface be treated as it is required.Aluminium shape surface
Treatment process is broadly divided into anodic oxidation, electrophoretic painting and three kinds of organic coating.Wood grain processing is one kind of organic coating processing,
Wood grain processing is divided into water transfer and two kinds of thermal transfer again.It is bright in luster that thermal transfer wood grain technology is mainly characterized by transferred image,
Level is abundant, and transferring effect can match in excellence or beauty with printing.Polyurethane/isocyanate systems are that the dedicated thermal transfer powder of aluminum profile applies
Material, polyurethane/isocyanate systems hardness is high, and levelling is good, good transferring effect.
Chinese patent announces CN106978057A and discloses a kind of polyurethane powder coating and preparation method thereof, by carboxyl end group
The more Isocyanates of polyester resin, enclosed type, titanium dioxide, powdered whiting, levelling agent, powder flow aid, talcum powder, sulfuric acid
Barium, pigment, edges cover agent and anticaking agent are filtered through mixed at high speed, melting extrusion, pressure roller tabletting, crushing, screening, and powder is made
Last coating；This method preparation polyurethane powder coating have pollution-free, energy conservation and environmental protection, reduce labor intensity with smooth coating and
The advantages of high mechanical strength.But this method is only prepared for a kind of coating that can be used in electromagnetic wire coating, there is no obvious
Improve the correlated performance of existing polyurethane powder coating.
Chinese patent bulletin CN102618161B discloses a kind of deep dull outdoor polyurethane powder coating and its life
Production. art, coating by the carboxyl polyester resin of 50-60%, the triglycidyl group chlorinated isocyanurates of 3-5%, 15-30% two
Titanium oxide, the blanc fixe of 15-30%, the acrylic acid first, acrylate copolymer of 0.98-1.3%, 0.5-1.5% Polypropionate,
The acrylic resin of 1-3.5% and the mixture of wax grade zinc catalyst are prepared, and pass through addition acrylic resin and wax grade zinc
The mixture of catalyst has adjusted the intensity of competitive reaction, has reached preferable extinction effect, but this method extinction effect has
It limits and more demanding to baking condition.
Currently, being badly in need of the polyurethane that a kind of baking temperature is low, baking time is short, dullness is good and wood grain thermal transfer effect is good
Powdery paints.
Summary of the invention
The purpose of the present invention is to provide a kind of powdery paints difunctional polyester resin, and the polyester resin is in levelability
Energy, mechanical performance, weather resistance, water boiling resistance performance, heat resistance, solvent resistance and thermal transfer performance etc. possess protrusion
Comprehensive performance.The object of the invention is also to provide the above-mentioned powdery paints preparation methods of difunctional polyester resin.
The first purpose of this invention is achieved through the following technical solutions: a kind of powdery paints difunctionality reunion
Ester resin, the polyester resin has carboxyl end group and terminal hydroxy group Liang Zhong functional group, acid value 20-45mgKOH/g, hydroxyl value are
15-45mgKOH/g, 200 DEG C of viscosity are 2600-5200mPas, number-average molecular weight 3000-4500, glass transition temperature
It is 61-69 DEG C, is mainly formed by the group lease making melt polymerization of following molar content:
Dihydric alcohol 44-55mol%, binary acid 40-46mol%, branching agent 0.1-3.Omol%, acidolysis agent 4-15mol%,
Esterification catalyst 0.01-0.10mol%.
Above-mentioned second purpose of the invention is achieved through the following technical solutions: above-mentioned powdery paints difunctionality
The preparation method of group's polyester resin, comprising the following steps:
(1) above-mentioned dosage relation is pressed, dihydric alcohol and branching agent are taken, material thawing is heated to, binary acid and ester is added
Change catalyst, lead to nitrogen continue temperature reaction, until 175 DEG C, 180 DEG C of esterification waters start to generate and distillate, gradually using 8-llh
It is warming up to 237-249 DEG C, it is Clear & Transparent to material system in this temperature 2-6h；
(2) it is then cooled to 200-210 DEG C, vacuumizes 3-5h, material acid value reaches 15mgKOH/g hereinafter, hydroxyl value at this time
For 55-95mgKOH/g；
(3) it is continuously heating to 228-236 DEG C, acidolysis agent is added, reaction 3-5h is Clear & Transparent to material system, and acid value reaches
To 30-55mgKOH/g, hydroxyl value 25-55mgKOH/g；
(4) it then is cooled to 220-226 DEG C, vacuumizes polycondensation 1-1.5h, acid value reaches 20-45mgKOH/g, and hydroxyl value reaches
To 15-45mgKOH/g, powdery paints difunctional polyester resin is obtained.
The invention discloses a kind of aluminum profile polyurethane powder coating, which contains 15-85 parts of terminal hydroxy group
Polyester resin, 6-95 part curing agent, 1.5-5 parts of auxiliary agents, 1-30 parts of pigment and 0.1-1.5 parts of organotin catalysts, pass through mixing
It is obtained using the hydroxyl telechelic polyester resin of different hydroxyl values and is applied with the polyurethane powder of good extinction effect and transferring effect
Material products further control the weight ratio of low hydroxyl value hydroxyl telechelic polyester resin and middle high hydroxyl value hydroxyl telechelic polyester resin, can
To continue to improve the extinction effect and transfer printing wood grain effect of polyurethane powder coating product, and polyurethane powder prepared by the present invention
Last coating also has the advantages that solidification temperature is low, curing time is short.The invention belongs to industrial coating fields, and in particular to environment friend
Good type High performance industrial coating, more particularly relates to a kind of aluminum profile polyurethane powder coating.
The present invention provides a kind of aluminum profile polyurethane wood grain powdery paints, which dries needed for spraying process
It is roasting that the time is short, baking temperature is low, dullness is good and wood grain thermal transfer effect is good.
Illustrate: the number of described each component each means parts by weight in the present invention.
The invention discloses a kind of aluminum profile polyurethane wood grain powdery paints: aluminum profile polyurethane wood grain powder applies
Material contains 15-85 parts of hydroxyl telechelic polyester resin, 6-95 parts of curing agent, 1.5-5 parts of auxiliary agents, 1-30 parts of pigment and 0.1-1.5 parts
Organotin catalysts.
A kind of aluminum profile filler also contained in polyurethane wood grain powdery paints no more than 50 parts.
The filler is delustring barium sulfate.
The hydroxyl telechelic polyester resin is hydroxyl telechelic polyester Resin A, hydroxyl telechelic polyester resin B and hydroxyl telechelic polyester resin
One of C or a variety of.
The hydroxyl value of the hydroxyl telechelic polyester Resin A is 33-63mgKOH/g；Preferably 43-63mgKOH/g；It is further excellent
It is selected as 43-53mgKOH/g.
The hydroxyl value of the hydroxyl telechelic polyester resin B is 90-130mgKOH/g；Preferably 100-130mgKOH/g；Into one
Step is preferably 100-120mgKOH/g.
The hydroxyl value of the hydroxyl telechelic polyester resin C is 270-320mgKOH/g；Preferably 280-320mgKOH/g；Into one
Step is preferably 280-310mgKOH/g.
The curing agent is self-styled closed form isocyanates.
The auxiliary agent is levelling agent, in optical brightener, pin hole remover, antioxidant, ultraviolet absorbing agent, degasser
It is one or more.
The organotin catalysts are one of dibutyl tin dilaurate (DBDTL), stannous octoate, stannous oxalate
Or it is a variety of.
The pigment includes but is not limited to one of titanium dioxide, carbon black, phthalocyanine blue, paratonere, iron oxide yellow or a variety of.
Preferably, which contains 20-80 parts of hydroxyl telechelic polyester resin, 12-50
Part curing agent, 1.5-3.5 parts of auxiliary agents, 1-25 parts of pigment and 0.1-1 parts of organotin catalysts.
It is highly preferred that the aluminum profile polyurethane wood grain powdery paints contains 25-80 parts of hydroxyl telechelic polyester resin, 12-
30 parts of curing agent, 0-40 parts of fillers, 1.5-3.5 parts of auxiliary agents, 1-25 parts of pigment and 0.1-1 parts of organotin catalysts.
In some preferred embodiments, the hydroxyl telechelic polyester Resin A can select sunrise spy's Ma synthomer public
Take charge of the product of the model Albester3225 of production.
In some preferred embodiments, the hydroxyl telechelic polyester resin B can select sunrise spy's Ma synthomer public
Take charge of the product of the model Albester3310 of production.
In some preferred embodiments, the hydroxyl telechelic polyester resin C can select sunrise spy's Ma synthomer public
Take charge of the product of the model Albester3315 of production.
In some preferred embodiments, the self-styled closed form of NW-5 that the curing agent can select Beyer Co., Ltd to produce
Isocyanates.
In some preferred embodiments, the hydroxyl telechelic polyester resin is hydroxyl telechelic polyester Resin A and terminal hydroxy group
The mixture of polyester resin B, and the weight ratio of hydroxyl telechelic polyester Resin A and hydroxyl telechelic polyester resin B is 1-6:1.
In some preferred embodiments, the hydroxyl telechelic polyester resin is hydroxyl telechelic polyester Resin A and terminal hydroxy group
The mixture of polyester resin B, and the weight ratio of hydroxyl telechelic polyester Resin A and hydroxyl telechelic polyester resin B is 2-5:1.
In some preferred embodiments, the hydroxyl telechelic polyester resin is hydroxyl telechelic polyester Resin A and terminal hydroxy group
The mixture of polyester resin C, and hydroxyl telechelic polyester Resin A and the weight ratio of hydroxyl telechelic polyester resin C are 1-6:1.
In some preferred embodiments, the hydroxyl telechelic polyester resin is hydroxyl telechelic polyester Resin A and terminal hydroxy group
The mixture of polyester resin C, and hydroxyl telechelic polyester Resin A and the weight ratio of hydroxyl telechelic polyester resin C are 2-5:1.
The invention also discloses the aluminum profile preparation methods of polyurethane wood grain powdery paints:
(1) it is pre-mixed: weighing material by formulation dosage, be placed in high-speed mixer and mix 3-6 minutes；
(2) squeeze out: mixed material is squeezed out at a temperature of 80-120 DEG C with extruder；
(3) crush: extruded material pulverizes and sieves that the powder product that partial size is 30-40 μm is made is spare with vertical pulverizer.
Compared with prior art, the invention has the benefit that
(1) conventional polyurethanes powdery paints needs to heat 20min solidification, poly- ammonia prepared by the present invention under the conditions of 200 DEG C
Under the conditions of 160 DEG C, heating 15min, that is, curable reduces solidification temperature, shortens baking time ester powdery paints, thus
Achieve the purpose that energy-saving and increases productivity.
(2) there is the problem of transfer is unintelligible, and wood grain three-dimensional sense is not strong, is not easy paper-tear picture in existing polyurethane powder.The present invention
The polyurethane powder coating of preparation can reach high-resolution wood grain effect, and 3D three-dimensional sense is strong and construction is simple, have energy-saving and environment-friendly
Advantage.
(3) present invention significantly reduces polyurethane by adjusting the dosage and ratio of different hydroxyl value hydroxyl telechelic polyester resins
The glossiness of powdery paints product improves the aesthetics and thermal transfer effect of polyurethane powder coating product.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Illustrate: the "-" in all tables of the present invention indicates that this content is not present.
Basic embodiment
A kind of aluminum profile polyurethane wood grain powdery paints: the aluminum profile polyurethane wood grain powdery paints contains 15-85
Part hydroxyl telechelic polyester resin, 0-50 parts of delustring barium sulfate fillers, 1 part of levelling agent, 0.5 portion of pin hole remover, 1.5 parts it is anti-oxidant
Agent, 0.1-1 parts of optical brighteners, 2 parts of pigment and 0.1-1.5 parts of organotin catalysts, wherein hydroxyl telechelic polyester resin is that hydroxyl value is
The hydroxyl telechelic polyester resin B and hydroxyl value that hydroxyl telechelic polyester Resin A, the hydroxyl value of 33-63mgKOH/g is 90-130mgKOH/g be
One of hydroxyl telechelic polyester resin C of 270-320mgKOH/g or a variety of, the corresponding 1 part of solidification of 4 parts of hydroxyl telechelic polyester Resin As
Agent, the corresponding 2 parts of curing agent of 3 parts of hydroxyl telechelic polyester resin Bs, the corresponding 3 parts of curing agent of 2 parts of hydroxyl telechelic polyester resin C, in the coating
The curing agent of addition is the sum of curing agent weight corresponding to various hydroxyl telechelic polyester resins.
The preparation method of aluminum profile polyurethane wood grain powdery paints:
(1) it is pre-mixed: weighing material by formula ratio, be placed in high-speed mixer and mix 3-6min；
(2) squeeze out: mixed material is squeezed out at a temperature of 100-120 DEG C with extruder；
(3) crush: base material is crushed with vertical pulverizer, and it is spare that the powder product that partial size is 30-40 μm is made in sieving.
By adjusting the specific experiment parameter in basic embodiment, the embodiment 1-18 in table 1-4 has been obtained.
By adjusting the additive amount of hydroxyl telechelic polyester resin, the type of hydroxyl telechelic polyester resin, various hydroxyl telechelic polyester trees
The weight ratio of rouge, the additive amount of filler, the additive amount of optical brightener, the type of catalyst and additive amount etc. have obtained in table 1-2
Embodiment 1-8, the experimental data in Tables 1 and 2 are shown: aluminum profile polyurethane wood grain powdery paints prepared by the present invention exists
Under 160 DEG C of solidification temperature, it can be formed by curing good coat by 20min, method of the invention significantly reduces polyurethane
The solidification temperature of powdery paints shortens the curing time of polyurethane powder coating.
Table 1
Table 2
The total addition level of hydroxyl telechelic polyester resin, the additive amount of filler, the additive amount of optical brightener, catalyst type and
In the identical situation of additive amount, by adjusting hydroxyl telechelic polyester resin type and it is various types of between ratio obtained in table 1
Embodiment 1-2 and table 3 in embodiment 9-13, wherein a kind of hydroxyl telechelic polyester resin is only added in embodiment 1-2, and
It is added to the different hydroxyl telechelic polyester resin of two kinds of hydroxyl values in embodiment 9-13, implements 1-2 and embodiment 9-13 by comparing,
It can be found that: in the preparation process of polyurethane powder coating, the hydroxyl telechelic polyester resin of different hydroxyl values is used in mixed way, it can be with
Reduce the glossiness of polyurethane powder coating product, and different hydroxyl value hydroxyl telechelic polyester resin is used in mixed way can reduce and tears
The difficulty of paper.
The difference of the embodiment 9 and embodiment 11-13 using two kinds of hydroxyl value hydroxyl telechelic polyester resins is further looked at, it can be with
It was found that when the weight ratio of low hydroxyl value hydroxyl telechelic polyester resin and middle hydroxyl value hydroxyl telechelic polyester resin is 0.6:1 (embodiment 9),
The dullness of polyurethane coating product reduces, and the three-dimensional sense for transferring pattern disappears, and paper print occurs in transfer process；10 He of embodiment
The difference of embodiment 11-13 is that the ratio that hydroxyl telechelic polyester Resin A and hydroxyl telechelic polyester resin B are added is different, by embodiment
10 experimental data and the experimental data of embodiment 11-13 are compared, it is found that use two kinds of different hydroxyl values ends same
In the case where hydroxy polyester resin, when the weight ratio of low hydroxyl value hydroxyl telechelic polyester resin and middle hydroxyl value hydroxyl telechelic polyester resin reaches
When 8:1, the dullness of polyurethane coating product is reduced, and the three-dimensional sense for transferring pattern disappears, and paper print: explanation occurs in transfer process
When by the control of the weight ratio of low hydroxyl value hydroxyl telechelic polyester resin and middle hydroxyl value hydroxyl telechelic polyester resin in the range of 1-6:1, energy
Enough it is obviously improved the dullness of polyurethane powder coating product, the three-dimensional sense of enhancing transfer pattern.
Table 3
A kind of embodiment 14 that hydroxyl telechelic polyester resin is only added in table 4 hydroxyl different with two kinds of hydroxyl values are added to is gathered
The embodiment 15-18 of ester resin is compared, same to can be found that:, will be different in the preparation process of polyurethane powder coating
The hydroxyl telechelic polyester resin of hydroxyl value is used in mixed way, and can be substantially reduced the glossiness of polyurethane powder coating product, and different
Hydroxyl value hydroxyl telechelic polyester resin is used in mixed way the difficulty that can reduce paper-tear picture.
The difference of embodiment 15 and embodiment 16-18 in table 4 is hydroxyl telechelic polyester Resin A and hydroxyl telechelic polyester resin
The ratio of C addition is different, and the experimental data of the experimental data of embodiment 15 and embodiment 16-18 is compared, it can be found that:
In the case where equally using two kinds of different hydroxyl value hydroxyl telechelic polyester resins, when low hydroxyl value hydroxyl telechelic polyester resin and high hydroxyl value end
When the weight ratio of hydroxy polyester resin reaches 8:1, the dullness of polyurethane coating product is reduced, and the three-dimensional sense for transferring pattern disappears
It loses, paper mark occurs.The embodiment 15-18 using two kinds of hydroxyl value hydroxyl telechelic polyester resins is further looked at it can be found that when low
Hydroxyl value hydroxyl telechelic polyester resin is different with the weight ratio of high hydroxyl value hydroxyl telechelic polyester resin, the dullness of polyurethane coating product
Difference, the three-dimensional sense for transferring pattern have power, and transfer paper paper-tear picture has difficulty or ease, low hydroxyl value hydroxyl telechelic polyester resin and high hydroxyl value end hydroxyl
When the weight ratio of base polyester resin is controlled in the range of 1-6:1, it can further be obviously improved polyurethane powder coating product
Dullness and transfer printing wood grain effect.
Table 4
Claims (10)
1. a kind of powdery paints difunctional polyester resin, it is characterized in that: the polyester resin has carboxyl end group and terminal hydroxy group
Liang Zhong functional group, acid value 20-45mgKOH/g, hydroxyl value 15-45mgKOH/g, 200 DEG C of viscosity are 2600-5200mPa
S, number-average molecular weight 3000-4500, glass transition temperature is 61-69 DEG C, mainly by the group of following molar content
Lease making melt polymerization forms: dihydric alcohol 44-55mol%, binary acid 40-46mol%, branching agent 0.1-3.0mol%, acidolysis agent
4-15mol%, esterification catalyst 0.01-0.10mol%.
2. the preparation method of difunctional polyester resin according to claim 1, which comprises the following steps:
(1) above-mentioned dosage relation is pressed, dihydric alcohol and branching agent are taken, is heated to material thawing, binary acid is added and esterification is urged
Agent, lead to nitrogen continue temperature reaction, until 175 DEG C, 180 DEG C of esterification waters start to generate and distillate, be gradually warmed up using 8-llh
It is Clear & Transparent to material system in this temperature 2-6h to 237-249 DEG C；
(2) it is then cooled to 200-210 DEG C, vacuumizes 3-5h, material acid value reaches 15mgKOH/g hereinafter, hydroxyl value is at this time
55-95mgKOH/g；
(3) it is continuously heating to 228-236 DEG C, acidolysis agent is added, reaction 3-5h is Clear & Transparent to material system, and acid value reaches 30-
55mgKOH/g, hydroxyl value 25-55mgKOH/g；
(4) it then is cooled to 220-226 DEG C, vacuumizes polycondensation 1-1.5h, acid value reaches 20-45mgKOH/g, and hydroxyl value reaches 15-
45mgKOH/g obtains powdery paints difunctional polyester resin.
3. powdery paints according to claim 1 difunctional polyester resin, it is characterized in that: the binary acid and institute
The integral molar quantity ratio of the integral molar quantity for the acidolysis agent stated and the dihydric alcohol and the branching agent is 0.8-1.2:1.
4. a kind of aluminum profile polyurethane wood grain powdery paints, it is characterised in that: aluminum profile polyurethane wood grain powdery paints
Have containing 15-85 parts of hydroxyl telechelic polyester resins, 6-95 parts of curing agent, 1.5-5 parts of auxiliary agents, 1-30 parts of pigment and 0.1-1.5 parts
Machine tin catalyst；The preferably described curing agent is self-styled closed form isocyanates.
5. a kind of aluminum profile according to claim 4 polyurethane wood grain powdery paints, it is characterised in that: the end hydroxyl
Base polyester resin is one of hydroxyl telechelic polyester Resin A, hydroxyl telechelic polyester resin B and hydroxyl telechelic polyester resin C or a variety of.
6. a kind of aluminum profile according to claim 5 polyurethane wood grain powdery paints, it is characterised in that: the end hydroxyl
The hydroxyl value of base polyester resin A is 33-63mgKOH/g.
7. a kind of aluminum profile according to claim 5 polyurethane wood grain powdery paints, it is characterised in that: the end hydroxyl
The hydroxyl value of base polyester resin B is 90-130mgKOH/g.
8. a kind of aluminum profile according to claim 5 polyurethane wood grain powdery paints, it is characterised in that: the end hydroxyl
The hydroxyl value of base polyester resin C is 270-320mgKOH/g.
9. a kind of aluminum profile according to claim 4 polyurethane wood grain powdery paints, it is characterised in that: the end hydroxyl
Base polyester resin be hydroxyl telechelic polyester Resin A and hydroxyl telechelic polyester resin B mixture, and hydroxyl telechelic polyester Resin A and end hydroxyl
The weight ratio of base polyester resin B is 1-6:1；Preferably, the hydroxyl telechelic polyester resin is hydroxyl telechelic polyester Resin A and end hydroxyl
The mixture of base polyester resin C, and hydroxyl telechelic polyester Resin A and the weight ratio of hydroxyl telechelic polyester resin C are 1-6:1.
10. a kind of preparation method of aluminum profile polyurethane wood grain powdery paints according to claim 4, feature exist
In:
(1) it is pre-mixed: weighing material by formulation dosage, be placed in high-speed mixer and mix 3-6 minutes；
(2) squeeze out: mixed material is squeezed out at a temperature of 80-120 DEG C with extruder；
(3) crush: extruded material pulverizes and sieves that the powder product that partial size is 30-40 μm is made is spare with vertical pulverizer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913112A (en) * | 2019-03-04 | 2019-06-21 | 浙江超浪新材料有限公司 | A kind of aluminium shape surface treatment process |
| CN114349942A (en) * | 2021-12-13 | 2022-04-15 | 安徽神剑新材料股份有限公司 | Bifunctional polyester resin, preparation method thereof and extinction powder coating |
| CN116285636A (en) * | 2023-03-28 | 2023-06-23 | 安徽神剑新材料股份有限公司 | Low-gloss polyurethane powder coating and preparation method thereof |
-
2018
- 2018-06-26 CN CN201810667544.1A patent/CN109021805A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913112A (en) * | 2019-03-04 | 2019-06-21 | 浙江超浪新材料有限公司 | A kind of aluminium shape surface treatment process |
| CN114349942A (en) * | 2021-12-13 | 2022-04-15 | 安徽神剑新材料股份有限公司 | Bifunctional polyester resin, preparation method thereof and extinction powder coating |
| CN116285636A (en) * | 2023-03-28 | 2023-06-23 | 安徽神剑新材料股份有限公司 | Low-gloss polyurethane powder coating and preparation method thereof |
| CN116285636B (en) * | 2023-03-28 | 2024-05-07 | 安徽神剑新材料股份有限公司 | Low-gloss polyurethane powder coating and preparation method thereof |
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Application publication date: 20181218 |