CN104448265A - Polyester resin for low-temperature-cured and energy-saving thermal-transfer-printing powdery coating material and preparation method thereof - Google Patents
Polyester resin for low-temperature-cured and energy-saving thermal-transfer-printing powdery coating material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses polyester resin for a low-temperature-cured and energy-saving thermal-transfer-printing powdery coating material. The polyester resin has the acid value of 38-55mgKOH/g, the hydroxyl value of being lower than 6mgKOH/g, the glass transition temperature of 60-70 DEG C and the melt viscosity of 2,000-4,000mPa.s. The invention further discloses a preparation method of the polyester resin. The polyester resin disclosed by the invention is of a TGIC cured type, the powdery coating material prepared from the polyester resin has good weatherability and has excellent mechanical properties and transfer printing effect, transfer-printed patterns are clear, and transfer-printed paper ripping is easy.
Description
Technical field
The present invention relates to a kind of TGIC cured powder paint vibrin, especially relate to the hot transfer printing polyester resin for powder coating that a kind of low-temperature curing is energy-saving.The invention still further relates to the preparation method of this vibrin.
Background technology
Powder coating through the extensive application of nearly 30 years, has obtained market accreditation widely as a kind of environment-friendly type industrial coating kind of excellent performance.Thermal-printing Technology introduces China at the phase at the end of the nineties in last century, but just obtaining development at full speed in recent years, and this mainly because of the raising along with people's living standard, serves certain pushing effect to the development of home furnishings market.Hot transfer printing penetrates in coating according to being printed on the printing-ink thermal dye sublimation transfer printing on transfer paper to the surface of film, can reach the object of imitative timber or stone material.This technology has the features such as transferred image is bright in luster, levels are rich, the key of its transfer printing is to need to ensure that the film of powder coating fully solidifies and has higher cross-linking density,, sticky paper, difficult paper-tear picture, the unsharp phenomenon of transfer printing would not be there is like this when transfer printing in the compactness that coating tool is higher.At present, the solidification value of transfer printing powder coating product is all higher, and substantially all at 190 ~ 210 DEG C, transfer temperature is 200 ~ 220 DEG C, and higher solidification value and transfer temperature limit it can only be used for the resistant substrates such as metal, and relatively power consumption, consuming time.But, along with the development of powder coating market application, wood-based product (as MDF etc.), plastics, metal plastic composite members etc. more and more adopt powder coating to carry out application and portioned product also needs to carry out hot transfer printing, because these goods all belong to thermo-sensitivity material, require that the solidification value of powder coating must reduce and could apply these products.
Chinese patent application CN102977346A discloses a kind of TGIC and solidifies hot transfer printing polyester resin for powder coating of weather resistant and preparation method thereof, it mainly proposes formula of the hot transfer printing polyester resin for powder coating of a kind of weather resistant and preparation method thereof, resinous acid value 30 ~ the 36mgKOH/g of synthesis, viscosity 4500 ~ 7500mP.s(ICI cone-and-plate viscometer, 200 DEG C), second-order transition temperature 62 ~ 70 DEG C, there is good weathering resistance, be applied to hot transfer printing and there is good transferring effect, the feature of clear patterns, but its solidification value (190 DEG C/10min) is all higher with transfer temperature (220 DEG C/3min), limit its application at heatsensitive substrates.
Chinese patent application CN101704945A discloses polyester resin for mixed powder coating and preparation method thereof, propose formula of the hot transfer printing polyester resin for powder coating of mixed type and preparation method thereof, synthesized vibrin is applied to the characteristic that hot transfer printing has good leveling property, the products solidifying temperature of this patent working method is lower, but because the monomer preparing vibrin is based on non-weather-proof monomer, it is weather-proof poor, is not suitable for outdoor transfer product.
Chinese patent application CN103304790A discloses vibrin of the hot transfer printing powder coating of outdoor aluminium section bar and preparation method thereof, the acid number of its vibrin is 25 ~ 75mgKOH/g, second-order transition temperature 20 ~ 80 DEG C, viscosity 20 ~ 60 moors (broolfield cone-and-plate viscometer, 200 DEG C), its solidification value is that 200 DEG C of guarantee products solidifyings are complete, also limit its application at heatsensitive substrates.
What require home decoration along with people improves constantly, and gets more and more to the demand of low-temperature curing or quick-setting transfer printing powder coating product, and society is more and more higher to the requirement of saving energy and reduce the cost, enhancing productivity of paint industry on the one hand; On the other hand, people require also more and more higher to coating decoration.But, under at present most solutions is only confined to ensure the prerequisite of the easy not sticky paper of transfer product clear patterns, paper-tear picture, for condition of cure and the very not large breakthrough of transfer printing condition.Transfer product to ensure clear patterns, paper-tear picture easily not sticky paper need paint coatings to have curing speed faster, higher coating cross-linking density.During low-temperature curing because activity is lower so curing speed is general comparatively slow, will there is the incomplete situation of solidification, the cross-linking density of such coating is difficult to raising can affect final transferring effect.In addition, conventional low temperature curing resin, because the kindliness monomer contained is more, Tg is lower, and coating is easily thermal distortion at high temperature, thus easily occurs sticky paper and transfer printing unsharp situation during hot transfer printing.
Summary of the invention
An object of the present invention is to provide the energy-saving hot transfer printing polyester resin for powder coating of a kind of low-temperature curing, this vibrin is the not only easy paper-tear picture of clear patterns not sticky paper point after lesser temps solidification with transfer printing, but also there is fine weathering resistance, be especially applicable to the powder coating being used in polyester/TGIC curing system.
Two of object of the present invention is to provide the preparation method of above-mentioned hot transfer printing polyester resin for powder coating.
First object of the present invention is realized by following technical measures: the hot transfer printing polyester resin for powder coating that a kind of low-temperature curing is energy-saving, acid number is 38 ~ 55mgKOH/g, hydroxyl value is less than 6mgKOH/g, second-order transition temperature is 60 ~ 70 DEG C, melt viscosity is 2000 ~ 4000mPa s(ICI cone-and-plate viscometer, 200 DEG C), its raw material cocondensation primarily of following weight percent forms:
Polyvalent alcohol 25% ~ 45%
Aromatic polycarboxylic acid 45 ~ 60%
Aliphatic polyol acid 0 ~ 2%
Branching agent 0 ~ 1%
Acidolysis agent 5% ~ 15%
Esterifying catalyst 0.01 ~ 0.15%
Curing catalyst 0.1 ~ 0.2%
Thermo-stabilizer 0.05% ~ 0.2%
Oxidation inhibitor 0.4% ~ 1%.
Polyvalent alcohol of the present invention is one or more mixtures in neopentyl glycol, 1,4 cyclohexane dimethanol, 2-butyl-2-ethyl-1,3-PD and hydroxypivalyl hydroxypivalate.
Aromatic polycarboxylic acid of the present invention is one or both the mixture in terephthaldehyde and m-phthalic acid.
Aliphatic polyol acid of the present invention is one or both mixtures in hexanodioic acid and 1,4 cyclohexanedicarboxylic acid.
Branching agent of the present invention is TriMethylolPropane(TMP).
Acidolysis agent of the present invention is one or more mixtures in m-phthalic acid, hexanodioic acid and 1,4 cyclohexanedicarboxylic acid.
Esterifying catalyst of the present invention is for having tin compound or Titanium series catalyst.Described have tin compound to be Mono-n-butyltin, tin oxalate or monobutyl dihydroxyl tin chloride.Described Titanium series catalyst is tetrabutyl titanate or titanium isopropylate.
Curing catalyst of the present invention is phosphonium salt class, as triphenylphosphine, triphenyl ethyl phosphonium bromide phosphine etc.; Or be quaternary ammonium salt, as tetraethylammonium bromide, Tetrabutyl amonium bromide etc.
Thermo-stabilizer of the present invention is triphenyl phosphite.
Oxidation inhibitor of the present invention is three (2,4-di-tert-butyl-phenyl) phosphorous acid ester (168), four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] one in pentaerythritol ester (1010) and β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester (1076) or two or more mixture.
Second object of the present invention is achieved through the following technical solutions: the preparation method of the hot transfer printing polyester resin for powder coating that a kind of low-temperature curing is energy-saving, and its concrete steps are:
(1) get polyvalent alcohol and the branching agent of proportional quantity, be heated to material and melt, then add the aromatic polycarboxylic acid of proportional quantity, the sour and esterifying catalyst of aliphatic polyol, logical nitrogen continues temperature reaction, starts to generate to 180 DEG C of esterification water and distillates; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 9 ~ 18mgKOH/g;
(2) the acidolysis agent of getting proportional quantity adds reaction kettle for reaction 3 ~ 5 hours, acid number reaches 45 ~ 65mgKOH/g, polycondensation is vacuumized 1 ~ 4 hour after adding the thermo-stabilizer of proportional quantity, acid number reaches 38 ~ 55mgKOH/g, melt viscosity is 2000 ~ 4000mPa s(ICI cone-and-plate viscometer, 200 DEG C), now add oxidation inhibitor, curing catalyst dispersed with stirring evenly rear cooling discharge, hot transfer printing polyester resin for powder coating can be obtained.
Vibrin acid number prepared by the present invention is 38 ~ 55mgKOH/g, and hydroxyl value is less than 6mgKOH/g, and second-order transition temperature is 55 ~ 70 DEG C, and melt viscosity is 2000 ~ 4000mPa s(ICI cone-and-plate viscometer, 200 DEG C).Especially the powder coating being used in polyester/TGIC curing system is applicable to.Compared to prior art, solidification value and the transfer temperature of vibrin provided by the invention are low, solidification value and the higher problem of transfer temperature that current transfer technique exists can be solved, coating after coating curing is not easily thermal distortion at high temperature, and the paper-tear picture with thermally transferred pattern, heat-transferring printing paper clearly easily, not sticky paper.The mechanical property of coating is excellent and take into account the weathering resistance of outdoor products, can meet and have certain requirements product application to weathering resistance, applied range.
Vibrin of the present invention is used to prepare powder coating: the vibrin of synthesis to be weighed up rear mixing in proportion with TGIC, color stuffing and other auxiliary agent respectively, melt extrudes, cool fragmentation, pulverize and sieve and make powder coating.Through low temperature (150 ~ 170 DEG C/15 ~ 30min) baking-curing on the powder paint made to transfer plate, be laid on by transfer paper after cooling on transfer plate and take out after transfer machine heating transfer (180 ~ 190 DEG C/5 ~ 10min), cooling paper-tear picture can obtain the transfer plate with fine pattern transferring.
Embodiment
Here is the specific embodiment of the present invention, and the purpose that this embodiment is enumerated is to help understanding of the present invention but not limitation of the invention.In embodiment, Resin A and B are comparative example, and be the conventional formulation of the hot transfer printing polyester resin for powder coating of synthesis at present, resin C ~ G is embodiments of the invention.
Comparative example 1: the synthesis of Resin A
The neopentyl glycol of 15Kg, the TriMethylolPropane(TMP) of 0.15Kg is added in the reactor of 100L, be warming up to 140 DEG C of insulations, add the terephthalic acid of 21.5Kg and the Mono-n-butyltin of 30g after alcohol melts completely, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 10mg KOH/g; Add the m-phthalic acid of 3.3Kg and the hexanodioic acid of 0.45Kg in a kettle., react 3 ~ 5 hours, acid number reaches 45mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 32g, acid number reaches 33.5mgKOH/g, and melt viscosity is 5300mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenylphosphine dispersed with stirring of the antioxidant 1076 and 40g that now add 80g can obtain comparative resin A, and its second-order transition temperature (Tg) is 68 DEG C.
Comparative example 2: the synthesis of resin B
The neopentyl glycol of 15.7Kg, the TriMethylolPropane(TMP) of 0.2Kg is added in the reactor of 100L, be warming up to 140 DEG C of insulations, add the terephthalic acid of 22.5Kg and the Mono-n-butyltin of 35g after alcohol melts completely, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 10mg KOH/g; Add the m-phthalic acid of 4.35Kg and the hexanodioic acid of 0.45Kg in a kettle., react 3 ~ 5 hours, acid number reaches 53mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 36g, acid number reaches 43.6mgKOH/g, melt viscosity is 4940mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenylphosphine dispersed with stirring now adding the irgasfos 168 of 96g, 96g antioxidant 1076 and 35g can obtain comparative resin B, and its second-order transition temperature (Tg) is 67 DEG C.
Embodiment 3: the synthesis of vibrin C
The neopentyl glycol of 15.9Kg, the TriMethylolPropane(TMP) of 0.15Kg is added in the reactor of 100L, be warming up to 140 DEG C of insulations, add the Mono-n-butyltin of the terephthalic acid of 22.6Kg, the hexanodioic acid of 0.6Kg and 35g after alcohol melts completely, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 12mg KOH/g; Add the m-phthalic acid of 3.75Kg and 1 of 0.5Kg in a kettle., 4-cyclohexane cyclohexanedimethanodibasic, react 3 ~ 5 hours, acid number reaches 53mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 36g, acid number reaches 43.3mgKOH/g, melt viscosity is 3550mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenyl ethyl phosphonium bromide phosphine dispersed with stirring now adding the irgasfos 168 of 96g, 150g antioxidant 1076 and 60g can obtain resin C, and its second-order transition temperature (Tg) is 65 DEG C.
Embodiment 4: the synthesis of vibrin D
1 of the neopentyl glycol of 14.6Kg, the TriMethylolPropane(TMP) of 0.2Kg and 1.5Kg is added in the reactor of 100L, 4-cyclohexanedimethanol, be warming up to 140 DEG C of insulations, add the terephthalic acid of 23Kg and the Mono-n-butyltin of 35g after alcohol melts completely, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 12mg KOH/g; Add the m-phthalic acid of 3.35Kg and 1 of 0.8Kg in a kettle., 4-cyclohexane cyclohexanedimethanodibasic, react 3 ~ 5 hours, acid number reaches 53mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 36g, acid number reaches 42.8mgKOH/g, melt viscosity is 3580mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenyl ethyl phosphonium bromide phosphine dispersed with stirring now adding the irgasfos 168 of 96g, 96g antioxidant 1010 and 60g can obtain resin D, and its second-order transition temperature (Tg) is 64 DEG C.
Embodiment 5: the synthesis of vibrin E
2-butyl-2-the ethyl-1 of the neopentyl glycol of 15Kg, the TriMethylolPropane(TMP) of 0.15Kg and 0.5Kg is added in the reactor of 100L, ammediol is warming up to 140 DEG C of insulations, add the terephthalic acid of 23Kg and the Mono-n-butyltin of 35g after alcohol melts completely, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 15mg KOH/g; Add 1 of the m-phthalic acid of 1.3Kg, the hexanodioic acid of 0.5Kg and 2.5Kg in a kettle., 4-cyclohexane cyclohexanedimethanodibasic, react 3 ~ 5 hours, acid number reaches 62mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 36g, acid number reaches 51.8mgKOH/g, melt viscosity is 2220mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenyl ethyl phosphonium bromide phosphine dispersed with stirring now adding the irgasfos 168 of 96g, 160g antioxidant 1076 and 55g can obtain resin E, and its second-order transition temperature (Tg) is 61 DEG C.
Embodiment 6: the synthesis of vibrin F
The neopentyl glycol adding 16.5Kg in the reactor of 100L is warming up to 140 DEG C of insulations, the terephthalic acid of 24Kg, 1 of 0.8Kg is added after alcohol melts completely, the Mono-n-butyltin of 4-cyclohexane cyclohexanedimethanodibasic and 39g, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 16mg KOH/g; Add the m-phthalic acid of 4.2Kg in a kettle., react 3 ~ 5 hours, acid number reaches 62mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 45g, acid number reaches 52.1mgKOH/g, and melt viscosity is 2180mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenyl ethyl phosphonium bromide phosphine dispersed with stirring now adding the irgasfos 168 of 96g, 160g antioxidant 1010 and 55g can obtain resin F, and its second-order transition temperature (Tg) is 60 DEG C.
Embodiment 7: the synthesis of vibrin G
The hydroxypivalyl hydroxypivalate of the neopentyl glycol of 14.6Kg, the TriMethylolPropane(TMP) of 0.2Kg and 2.1Kg is added in the reactor of 100L, be warming up to 140 DEG C of insulations, add the terephthalic acid of 23Kg and the Mono-n-butyltin of 35g after alcohol melts completely, logical nitrogen continues temperature reaction to a 180 DEG C esterification water and starts to generate and distillate; Then be warming up to 250 DEG C gradually, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 11.5mg KOH/g; Add the m-phthalic acid of 3.35Kg and the hexanodioic acid of 0.8Kg in a kettle., react 3 ~ 5 hours, acid number reaches 53mgKOH/g, polycondensation is vacuumized 2 ~ 4 hours after adding the triphenyl phosphite of 36g, acid number reaches 41.5mgKOH/g, melt viscosity is 3660mPa s(ICI cone-and-plate viscometer, 200 DEG C), the even rear cooling discharge of triphenyl ethyl phosphonium bromide phosphine dispersed with stirring now adding the irgasfos 168 of 96g, 96g antioxidant 1010 and 66g can obtain resin G, and its second-order transition temperature (Tg) is 64 DEG C.
The performance of the vibrin of the present invention's synthesis embodies by the performance being prepared into powder coating.According to the recipe requirements of transfer powder, the vibrin synthesize above-described embodiment A ~ G and TGIC, flow agent, titanium dioxide, barium sulfate, st-yrax, optical brightener etc. weigh up rear mixing in proportion, with screw extrusion press melting extrude respectively, compressing tablet, fragmentation, then sheet stock is pulverized and sieved and make powder coating, plate is carried out transfer printing by coating after the condition of 150 ~ 170 DEG C/15 ~ 30min is cured on transfer machine, transfer printing condition is 180 ~ 190 DEG C/5 ~ 10min, paper-tear picture after cooling also carries out coating performance sign, and characterization result is in table 1.
Known according to table 1, be applied to hot transfer printing after vibrin C ~ G prepared by the present invention is prepared into powder coating, compared with the Resin A ~ B of routine, the clear and not sticky paper of machinery excellent performance, pattern transferring when low-temperature curing.
Claims (10)
1. the hot transfer printing polyester resin for powder coating that a low-temperature curing is energy-saving, it is characterized in that, acid number is 38 ~ 55mgKOH/g, hydroxyl value is less than 6mgKOH/g, second-order transition temperature is 60 ~ 70 DEG C, melt viscosity is 2000 ~ 4000mPa s, and its raw material cocondensation primarily of following weight percent forms:
Polyvalent alcohol 25% ~ 45%
Aromatic polycarboxylic acid 45 ~ 60%
Aliphatic polyol acid 0 ~ 2%
Branching agent 0 ~ 1%
Acidolysis agent 5% ~ 15%
Esterifying catalyst 0.01 ~ 0.15%
Curing catalyst 0.1 ~ 0.2%
Thermo-stabilizer 0.05% ~ 0.2%
Oxidation inhibitor 0.4% ~ 1%.
2. the hot transfer printing polyester resin for powder coating that low-temperature curing according to claim 1 is energy-saving, it is characterized in that, described polyvalent alcohol is neopentyl glycol, 1, one or more mixtures in 4-cyclohexanedimethanol, 2-butyl-2-ethyl-1,3-PD and hydroxypivalyl hydroxypivalate.
3. the hot transfer printing polyester resin for powder coating that low-temperature curing according to claim 1 and 2 is energy-saving, is characterized in that, described aromatic polycarboxylic acid is one or both the mixture in terephthaldehyde and m-phthalic acid.
4. the hot transfer printing polyester resin for powder coating that the low-temperature curing according to claim 1 or 2 or 3 is energy-saving, is characterized in that, described aliphatic polyol acid is one or both mixtures in hexanodioic acid and 1,4 cyclohexanedicarboxylic acid.
5. the hot transfer printing polyester resin for powder coating that low-temperature curing according to claim 4 is energy-saving, is characterized in that, described branching agent is TriMethylolPropane(TMP).
6. the hot transfer printing polyester resin for powder coating that the low-temperature curing according to claim 1 or 2 or 3 or 4 or 5 is energy-saving, it is characterized in that, described acidolysis agent is one or more mixtures in m-phthalic acid, hexanodioic acid and 1,4 cyclohexanedicarboxylic acid.
7. the hot transfer printing polyester resin for powder coating that low-temperature curing according to claim 6 is energy-saving, is characterized in that, described esterifying catalyst is for having tin compound or Titanium series catalyst; Described have tin compound to be Mono-n-butyltin, tin oxalate or monobutyl dihydroxyl tin chloride, and described Titanium series catalyst is tetrabutyl titanate or titanium isopropylate.
8. the hot transfer printing polyester resin for powder coating that low-temperature curing according to claim 7 is energy-saving, is characterized in that, described curing catalyst is phosphonium salt class or quaternary ammonium salt; Described thermo-stabilizer is triphenyl phosphite; Described oxidation inhibitor is three (2,4-di-tert-butyl-phenyl) phosphorous acid ester, four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] one in pentaerythritol ester and β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester or two or more mixture.
9. the hot transfer printing polyester resin for powder coating that low-temperature curing according to claim 8 is energy-saving, is characterized in that, described phosphonium salt class is triphenylphosphine and/or triphenyl ethyl phosphonium bromide phosphine; Described quaternary ammonium salt is tetraethylammonium bromide and/or Tetrabutyl amonium bromide.
10. the preparation method of the hot transfer printing polyester resin for powder coating that the low-temperature curing described in any one of claim 1 ~ 9 is energy-saving, is characterized in that, comprise the following steps:
(1) get polyvalent alcohol and the branching agent of proportional quantity, be heated to material and melt, then add the aromatic polycarboxylic acid of proportional quantity, the sour and esterifying catalyst of aliphatic polyol, logical nitrogen continues temperature reaction, starts to generate to 180 DEG C of esterification water and distillates; Then be warming up to 250 DEG C, the little esterification water up to 95% of reaction 2 ~ 5 is discharged, and now reaction system clarification is without particle, and acid number reaches 9 ~ 18mgKOH/g;
(2) the acidolysis agent of getting proportional quantity adds reaction kettle for reaction 3 ~ 5 hours, acid number reaches 45 ~ 65mgKOH/g, polycondensation is vacuumized 1 ~ 4 hour after adding the thermo-stabilizer of proportional quantity, acid number reaches 38 ~ 55mgKOH/g, melt viscosity is 2000 ~ 4000mPa s, now add oxidation inhibitor, curing catalyst dispersed with stirring evenly rear cooling discharge, hot transfer printing polyester resin for powder coating can be obtained.
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| WO2021031377A1 (en) * | 2019-08-20 | 2021-02-25 | 安徽神剑新材料股份有限公司 | Polyester resin used for graphene-containing powder coating |
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