CN114318585B - High-elasticity thermal-bonding composite polyester fiber, preparation method and application - Google Patents
High-elasticity thermal-bonding composite polyester fiber, preparation method and application Download PDFInfo
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- CN114318585B CN114318585B CN202111594767.8A CN202111594767A CN114318585B CN 114318585 B CN114318585 B CN 114318585B CN 202111594767 A CN202111594767 A CN 202111594767A CN 114318585 B CN114318585 B CN 114318585B
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- 239000000835 fiber Substances 0.000 title claims abstract description 108
- 229920000728 polyester Polymers 0.000 title claims abstract description 84
- 239000002131 composite material Substances 0.000 title claims abstract description 73
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 83
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims abstract description 78
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 56
- 150000002148 esters Chemical class 0.000 claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000012792 core layer Substances 0.000 claims abstract description 15
- 238000009987 spinning Methods 0.000 claims abstract description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 6
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 6
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 29
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000005809 transesterification reaction Methods 0.000 claims description 22
- 239000003054 catalyst Substances 0.000 claims description 21
- 238000006068 polycondensation reaction Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 13
- BJZYYSAMLOBSDY-QMMMGPOBSA-N (2s)-2-butoxybutan-1-ol Chemical compound CCCCO[C@@H](CC)CO BJZYYSAMLOBSDY-QMMMGPOBSA-N 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- WSXIMVDZMNWNRF-UHFFFAOYSA-N antimony;ethane-1,2-diol Chemical compound [Sb].OCCO WSXIMVDZMNWNRF-UHFFFAOYSA-N 0.000 claims description 9
- NMYFVWYGKGVPIW-UHFFFAOYSA-N 3,7-dioxabicyclo[7.2.2]trideca-1(11),9,12-triene-2,8-dione Chemical group O=C1OCCCOC(=O)C2=CC=C1C=C2 NMYFVWYGKGVPIW-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 230000000379 polymerizing effect Effects 0.000 claims description 7
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000009998 heat setting Methods 0.000 claims description 6
- 239000012760 heat stabilizer Substances 0.000 claims description 6
- HHDOORYZQSEMGM-UHFFFAOYSA-L potassium;oxalate;titanium(4+) Chemical compound [K+].[Ti+4].[O-]C(=O)C([O-])=O HHDOORYZQSEMGM-UHFFFAOYSA-L 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- -1 terephthalic acid propylene glycol ester Chemical class 0.000 claims description 6
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 claims description 6
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 claims description 6
- 239000004246 zinc acetate Substances 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 230000032050 esterification Effects 0.000 claims description 3
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- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 2
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 2
- 229920000742 Cotton Polymers 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920000297 Rayon Polymers 0.000 claims description 2
- 235000009120 camo Nutrition 0.000 claims description 2
- 235000005607 chanvre indien Nutrition 0.000 claims description 2
- 239000011487 hemp Substances 0.000 claims description 2
- 238000010309 melting process Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 238000003856 thermoforming Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 abstract description 4
- NOJQSZZIXRYAFK-UHFFFAOYSA-N propane-1,2-diol;terephthalic acid Chemical group CC(O)CO.OC(=O)C1=CC=C(C(O)=O)C=C1 NOJQSZZIXRYAFK-UHFFFAOYSA-N 0.000 abstract description 3
- 239000002657 fibrous material Substances 0.000 abstract description 2
- 238000004383 yellowing Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 12
- 210000004177 elastic tissue Anatomy 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
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- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 244000060011 Cocos nucifera Species 0.000 description 3
- 235000013162 Cocos nucifera Nutrition 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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- 239000004744 fabric Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Abstract
The invention relates to the technical field of new chemical fiber materials, in particular to a high-elasticity thermal-bonding composite polyester fiber and a preparation method and application thereof. The high-elasticity thermal-bonding composite polyester fiber is prepared by parallel composite spinning of sheath-core composite polyester and PET-PEG copolyether ester; the sheath-core composite polyester skin layer is low-melting-point polyester, the core layer is terephthalic acid propylene glycol ester PTT, the PET-PEG copolyether ester is prepared by copolymerization reaction of terephthalic acid, ethylene glycol and polyethylene glycol, the molar ratio of terephthalic acid to ethylene glycol is 1.0:1.1-1.0:1.3, and the mass ratio of PEG to terephthalic acid is 25: 100-40: 100. the composite polyester fiber improves the elasticity of the polyester fiber, improves the elastic recovery and compression durability of the fiber, has the characteristics of difficult yellowing, good air permeability, good rebound resilience, durability and good safety, and can replace sponge to be used as a high-performance buffer material by adopting the fiber aggregate of the composite polyester fiber.
Description
Technical Field
The invention relates to the technical field of new chemical fiber materials, in particular to a high-elasticity thermal-bonding composite polyester fiber and a preparation method and application thereof.
Background
The traditional filling materials are generally classified into four types of plant materials, fibers, sponge and foam plastics, the durability of the plant materials and the foam plastics is good, but after long-term use, the plant materials can generate much dust, the mechanical properties of the foam plastics such as rebound resilience and the like are poor, the fiber filling materials are more applied to clothing filling materials, such as hollow polyester fibers, have better elasticity, strength and warmth retention property, the fiber filling materials are widely applied to pillow, quilt, pillow core, down jackets and the like as filling materials, the use requirements of the household filling materials mainly comprise heat preservation, fluffiness and rebound resilience, and the household filling materials are mainly sponge at present.
The sponge is a plastic product produced by the glue-linking reaction of polyurethane and other materials, has high rebound, light weight and good durability, and is widely applied to the fields of mattresses, cushions, underwear cup mats, sofas and the like. Along with the continuous improvement of the requirements of people on health and life quality, as toxic and harmful substances toluene diisocyanate is used in the sponge synthesis process, the sponge product has great harm and pollution to human bodies and environment, and is airtight due to foaming, so that the sponge product used as a filler has poor use comfort, and particularly has easy sultry feeling and uncomfortable feeling after being contacted with the human bodies for a long time, and the sponge is easy to turn yellow after being used for a long time. However, the demand of the current market for sponge is large, and no related product for completely replacing the sponge exists. Therefore, a filling material which is not easy to turn yellow, has good air permeability, rebound resilience, durability and safety is developed, and has excellent market prospect and market value.
The Chinese patent application (publication No. CN103054392A, publication No. 20130424) is a fiber bed core with good rebound resilience, which comprises at least one middle layer and a surface layer arranged on the upper surface or the lower surface of the middle layer, wherein the surface layer consists of the following components in percentage by weight: 15-40% of low-melting-point fibers and 60-85% of polyester fibers, wherein the middle layer comprises the following components in percentage by weight: 60% -85% of palm fiber and 15% -40% of low-melting-point fiber, wherein the palm fiber consists of coconut fiber and fibrilia, and the ratio of the coconut fiber to the fibrilia is 1-4:1. The invention also discloses a preparation method of the fiber bed core, which comprises the following steps: each layer comprises an upper surface layer, a lower surface layer and a middle layer, and is prepared by sequentially paving, baking, cold rolling, cooling, cutting, inspecting and packaging. The fiber bed core and the preparation method thereof solve the technical problems of easy layering fracture, insufficient elasticity, poor air permeability, mildew and insect growth and the like in the existing mattress; because of the content ratio of the coconut fiber and the fibrilia, the composite material has better rebound performance and certain hardness, and is particularly suitable for middle-aged and elderly people. The above patent uses only low melting point fiber and polyester fiber for the facing layer, and cannot be used as a high elastic sponge.
Chinese patent application publication (CN 101851812a, publication No. 20101006) discloses a side-by-side composite elastic fiber and a method for manufacturing the same, wherein the side-by-side composite elastic fiber is made by side-by-side composite spinning of polybutylene terephthalate (PBT) and polyethylene terephthalate (PET) in a weight ratio of 70:30-30:70, and then false twisting, the elastic elongation of the elastic fiber is 130-220%, and the elastic recovery rate is above 85%. The patent is suitable for filling clothes and can not be made into a high-elasticity spongy cushion for use.
Chinese patent application (publication No. CN105155034A, publication No. 2015158) discloses a thermal bonding elastic fiber and a preparation method thereof. The thermal bonding elastic fiber is a double-component composite fiber formed by a component A and a component B, and the component A and the component B are in a parallel A/B state; wherein, the component A is polyethylene glycol terephthalate and the component B is low-melting polyester; the low-melting polyester is formed by copolymerizing terephthalic acid and/or isophthalic acid and aliphatic dihydric alcohol with odd-numbered carbon main chain. In the thermally bonded elastic fiber, the two components are in a side-by-side state. Compared with the sheath-core type composite fiber, the composite fiber with the parallel form has relatively good elasticity. In addition, the copolymerization component of the low-melting-point polyester, namely the aliphatic dihydric alcohol with the main chain of odd carbon, endows the low-melting-point polyester with better elasticity due to an odd carbon effect. Both factors give the thermally bonded elastic fiber a higher elasticity. The higher elasticity of the patent is to use a curl recovery test and an elastic recovery test with a constant elongation of 50%, and the patent cannot be used as a sponge, so that the hardness and the hardness retention of the sponge are kept to be better.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the high-elasticity thermal-bonding composite polyester fiber, which improves the elasticity of the polyester fiber, improves the elastic recovery and compression durability of the fiber, has the characteristics of difficult yellowing, good air permeability, rebound resilience, durability and good safety, and can replace sponge to be used as a high-performance buffer material.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the high-elasticity thermal-bonding composite polyester fiber is prepared by parallel composite spinning of sheath-core composite polyester and PET-PEG copolyether ester; the sheath-core composite polyester skin layer is low-melting-point polyester, the core layer is terephthalic acid propylene glycol ester PTT, the PET-PEG copolyether ester is prepared by copolymerization reaction of terephthalic acid, ethylene glycol and polyethylene glycol, the molar ratio of terephthalic acid to ethylene glycol is 1.0:1.1-1.0:1.3, and the mass ratio of PEG to terephthalic acid is 25: 100-40: 100.
preferably, the mass ratio of the sheath-core composite melt to the PET-PEG copolyetherester is 55: 45-50: 50.
preferably, the low-melting-point polyester is prepared by polymerizing terephthalic acid, 1, 4-butanediol, isophthalic acid and polytetrahydrofuran glycol serving as raw materials, wherein the molar ratio of terephthalic acid to isophthalic acid is 7:3-8:2, and the molar ratio of 1, 4-butanediol to polytetrahydrofuran glycol is 6: 4-8: 2, the molecular weight of PTMG is 600-1000; the melting process of the low-melting polyester is 130-160 ℃.
Preferably, the preparation method of the low-melting polyester comprises the following steps:
1) Transesterification: adding terephthalic acid, 1, 4-butanediol, isophthalic acid and zinc acetate serving as a catalyst into a polymerization kettle, performing transesterification reaction at 180-200 ℃, and ending the transesterification reaction when the distilled amount of esterified water is 85-90% of the theoretical amount;
2) Polycondensation reaction: and adding polytetrahydrofuran glycol, triphenyl phosphate and a titanium potassium oxalate catalyst into the transesterification product, continuously heating to 250-265 ℃, slowly decompressing to less than 133Pa, carrying out polycondensation reaction for 2-3 h, and discharging under the protection of nitrogen to obtain the low-melting-point polyester.
Preferably, the sheath-core composite polyester of the invention takes the low-melting-point modified polyester as a sheath layer, takes the trimethylene terephthalate as a core layer and adopts a sheath-core composite form, and the ratio of the sheath layer to the core layer is 45: 50-55: 45.
preferably, the preparation method of the PET-PEG copolyetherester comprises the following steps:
1) Putting terephthalic acid and ethylene glycol in a molar ratio of 1.0:1.1-1.0:1.3, ethylene glycol antimony serving as a catalyst and trimethyl phosphate serving as a heat stabilizer into a reaction kettle, replacing the reaction kettle with nitrogen at 220-250 ℃ and 0.3-0.5 MPa, and adding PEG when the receiving amount of esterification water reaches 90-95% of a theoretical value;
2) After the reaction 1h is continued, slowly vacuumizing to perform polycondensation reaction;
3) And (3) finishing the temperature rise and pressure reduction stage within about 1h, finally reducing the pressure in the kettle to 70Pa, and polymerizing under the condition that the temperature is increased from 250 ℃ to 265 ℃, wherein the evaporation amount of glycol reaches 85-90% of the theoretical value, and finishing the reaction to obtain the PET-PEG copolyether ester.
Preferably, the moisture regain of the composite polyester fiber is more than 0.8%, the fiber hardness is 280-310N, and the hardness retention rate is more than 85%.
The invention further discloses a preparation method of the high-elasticity thermal-bonding composite polyester fiber, which comprises the following steps:
1) Performing transesterification reaction and polycondensation reaction on terephthalic acid, 1, 4-butanediol, isophthalic acid and polytetrahydrofuran glycol to obtain low-melting-point modified polyester, and preparing skin-core composite polyester by taking the low-melting-point modified polyester as a skin layer and taking the terephthalic acid propylene glycol ester as a core layer;
2) Carrying out copolymerization reaction on terephthalic acid, ethylene glycol and polyethylene glycol to obtain PET-PEG copolyether ester;
3) And (3) carrying out parallel composite spinning on the sheath-core composite polyester and the PET-PEG copolyether ester, carrying out annular blowing cooling to obtain primary fibers, and carrying out the processes of drafting, crimping, heat setting and cutting to obtain the short fibers.
Preferably, in the step 3), the wind speed of the annular blower is 1.5-2.5 m/s, and the wind temperature is 20-30 ℃; the oil application rate is 18% -28%; primary stretching of the nascent fiber adopts a water bath (oil-containing agent) heating mode with relatively uniform heating, and the temperature is controlled to be between 40 ℃ and 45 ℃ relatively proper; the second stretching step needs to be carried out at a higher temperature, and steam heating is adopted, so that the temperature is controlled to be 48-55 ℃. The draft ratio is 4.0-4.3, and the first stretching ratio is controlled to be about 85% of the total stretching ratio. The fiber setting temperature is 50-65 ℃ and the setting time is 35-45 min.
The invention further discloses a high-elasticity filling fiber aggregate, which is prepared by mixing and thermoforming the composite polyester fiber and other fibers, wherein the mass percentage of the composite polyester fiber is 10% -100%; preferably, the other fibers comprise one or more of polyester fibers, polyamide fibers, viscose fibers, cotton fibers, hemp fibers, polyacrylonitrile fibers, polypropylene fibers.
Further, the invention also discloses a high-elasticity filling product, which comprises a filling sponge and a fabric for wrapping the filling, and is characterized in that: the filling sponge adopts the high-elasticity filling fiber aggregate; preferably, the product is a mattress, an undergarment cup pad, an insole or a sofa.
The invention adopts the technical scheme to improve the elasticity of polyester fibers, the fibers are formed by compounding sheath-core composite polyester and PET-PEG copolyether ester in parallel, the sheath-core composite polyester skin layer is low-melting polyester, the fibers are melted to form staggered points under a certain temperature condition, the core layer is propylene glycol terephthalate, and the PET-PEG copolyether ester which is another component is compounded in parallel can improve the elasticity recovery property and compression durability of the fibers, gaps exist among the fibers to allow water vapor and air to permeate, and the comfort of a finished product can be improved.
Detailed Description
The invention will be further illustrated with reference to examples.
Example 1
The preparation method of the high-elasticity thermal bonding polyester fiber comprises the following steps:
1) Adding a certain amount of terephthalic acid PTA, 1, 4-butanediol BDO, isophthalic acid IPA and a catalyst zinc acetate into a polymerization kettle, performing transesterification reaction at 190 ℃, and ending the transesterification reaction when the distilled amount of esterified water is 85% -90% of the theoretical amount. Adding polytetrahydrofuran glycol PTMG, triphenyl phosphate and a titanium potassium oxalate catalyst into the transesterification product, continuously heating to 265 ℃, slowly decompressing to less than 133Pa, carrying out polycondensation reaction for 2h, and discharging under the protection of nitrogen to obtain modified low-melting-point polyester;
2) The prepared low-melting-point modified polyester is taken as a skin layer, the trimethylene terephthalate is taken as a core layer, and the preparation method adopts
Compounding the skin and the core;
table 1 skin-core composite raw material ratio
| PTA（mol%） | IPA（mol%） | BDO（mol%） | PTMG（mol%） | Molecular weight of PTMG | Sheath-core composite ratio |
| 75 | 25 | 78 | 22 | 650 | 50/50 |
3) Putting terephthalic acid and ethylene glycol in a molar ratio of 1.0:1.2, catalyst ethylene glycol antimony (relative PTA mass fraction is 0.45%), heat stabilizer trimethyl phosphate (relative PTA mass fraction is 0.45%), and replacing with nitrogen at 220-250 ℃ and 0.3-0.5 MPa, and adding PEG (PEG to terephthalic acid mass ratio is 25) when the receiving amount of esterification water reaches 90-95% of theoretical value: 100 PEG relative molecular weight 2000. After the reaction 1h is continued, slowly vacuumizing to perform polycondensation reaction; and (3) finishing the temperature rise and pressure reduction stage within about 1h, finally reducing the pressure in the kettle to 70Pa, and polymerizing under the condition that the temperature is increased from 250 ℃ to 265 ℃, wherein the evaporation amount of ethylene glycol reaches 85-90% of the theoretical value, and finishing the reaction to obtain the PET-PEG copolyether ester.
4) Carrying out parallel composite spinning on the sheath-core composite melt and the PET-PEG copolyether ester, wherein the mass ratio of the sheath-core composite melt to the PET-PEG copolyether ester is 50:50. the primary fiber is prepared by ring blowing and cooling, and then the short fiber is prepared by the working procedures of drafting, mechanical crimping, heat setting and cutting; the air speed of the circular air blowing is 1.5 m/s-2.5 m/s, and the air temperature is 20-30 ℃; the oil application rate is 18% -28%; primary stretching of the nascent fiber adopts a water bath (oil-containing agent) heating mode with relatively uniform heating, and the temperature is controlled to be between 40 ℃ and 45 ℃ relatively proper; the second stretching step needs to be carried out at a higher temperature, and steam heating is adopted, so that the temperature is controlled to be 48-55 ℃. The draft ratio is 4.0-4.3, and the first stretching ratio is controlled to be about 85% of the total stretching ratio. The fiber setting temperature is 50-65 ℃ and the setting time is 35-45 min.
Example 2
The preparation method of the high-elasticity thermal bonding polyester fiber comprises the following steps:
1) Adding a certain amount of terephthalic acid, 1, 4-butanediol, isophthalic acid and catalyst zinc acetate into a polymerization kettle, performing transesterification reaction at 190 ℃, and ending the transesterification reaction when the distilled amount of esterified water is 85% -90% of the theoretical amount. Adding polytetrahydrofuran glycol, triphenyl phosphate and a titanium potassium oxalate catalyst into the transesterification product, continuously heating to 265 ℃, slowly decompressing to less than 133Pa, carrying out polycondensation reaction for 2h, and discharging under the protection of nitrogen to obtain modified low-melting-point polyester;
2) The prepared low-melting-point modified polyester is taken as a skin layer, the trimethylene terephthalate is taken as a core layer, and the preparation method adopts
Compounding the skin and the core;
table 2 skin-core composite raw material ratio
| PTA（mol%） | IPA（mol%） | BDO（mol%） | PTMG（mol%） | Molecular weight of PTMG | Sheath-core composite ratio |
| 75 | 25 | 68 | 32 | 750 | 50/50 |
3) Putting terephthalic acid and ethylene glycol in a molar ratio of 1.0:1.2, catalyst ethylene glycol antimony and heat stabilizer trimethyl phosphate into a reaction kettle (the mass fraction of the catalyst ethylene glycol antimony is 0.5 percent relative to PTA), replacing the reaction kettle with nitrogen at 220-250 ℃ and 0.3-0.5 MPa, and adding PEG (the mass ratio of PEG to terephthalic acid is 25:100 PEG relative molecular weight of 3000. After the reaction 1h is continued, slowly vacuumizing to perform polycondensation reaction; and (3) finishing the temperature rise and pressure reduction stage within about 1h, finally reducing the pressure in the kettle to 70Pa, and polymerizing under the condition that the temperature is increased from 250 ℃ to 265 ℃, wherein the evaporation amount of ethylene glycol reaches 85-90% of the theoretical value, and finishing the reaction to obtain the PET-PEG copolyether ester.
4) Carrying out parallel composite spinning on the sheath-core composite melt and the PET-PEG copolyether ester, wherein the mass ratio of the sheath-core composite melt to the PET-PEG copolyether ester is 50:50. the primary fiber is prepared by ring blowing and cooling, and then the short fiber is prepared by the working procedures of drafting, mechanical crimping, heat setting and cutting; the air speed of the circular air blowing is 1.5 m/s-2.5 m/s, and the air temperature is 20-30 ℃; the oil application rate is 18% -28%; primary stretching of the nascent fiber adopts a water bath (oil-containing agent) heating mode with relatively uniform heating, and the temperature is controlled to be between 40 ℃ and 45 ℃ relatively proper; the second stretching step needs to be carried out at a higher temperature, and steam heating is adopted, so that the temperature is controlled to be 48-55 ℃. The draft ratio is 4.0-4.3, and the first stretching ratio is controlled to be about 85% of the total stretching ratio. The fiber setting temperature is 50-65 ℃ and the setting time is 35-45 min.
Example 3
The preparation method of the high-elasticity thermal bonding polyester fiber comprises the following steps:
1) Adding a certain amount of terephthalic acid, 1, 4-butanediol, isophthalic acid and catalyst zinc acetate into a polymerization kettle, performing transesterification reaction at 190 ℃, and ending the transesterification reaction when the distilled amount of esterified water is 85% -90% of the theoretical amount. Adding polytetrahydrofuran glycol, triphenyl phosphate and a titanium potassium oxalate catalyst into the transesterification product, continuously heating to 265 ℃, slowly decompressing to less than 133Pa, carrying out polycondensation reaction for 2h, and discharging under the protection of nitrogen to obtain modified low-melting-point polyester;
2) The prepared low-melting-point modified polyester is taken as a skin layer, the trimethylene terephthalate is taken as a core layer, and the preparation method adopts
Compounding the skin and the core;
table 3 skin-core composite raw material formulation
| PTA（mol%） | IPA（mol%） | BDO（mol%） | PTMG（mol%） | Molecular weight of PTMG | Sheath-core composite ratio |
| 70 | 30 | 60 | 40 | 800 | 55/45 |
3) Putting terephthalic acid and ethylene glycol in a molar ratio of 1.0:1.2, catalyst ethylene glycol antimony and heat stabilizer trimethyl phosphate into a reaction kettle (the mass fraction of the catalyst ethylene glycol antimony is 0.5 percent relative to PTA), replacing the reaction kettle with nitrogen at 220-250 ℃ and 0.3-0.5 MPa, and adding PEG (the mass ratio of PEG to terephthalic acid is 40:100 PEG relative molecular weight 2000. After the reaction 1h is continued, slowly vacuumizing to perform polycondensation reaction; and (3) finishing the temperature rise and pressure reduction stage within about 1h, finally reducing the pressure in the kettle to 70Pa, and polymerizing under the condition that the temperature is increased from 250 ℃ to 265 ℃, wherein the evaporation amount of ethylene glycol reaches 85-90% of the theoretical value, and finishing the reaction to obtain the PET-PEG copolyether ester.
4) Carrying out parallel composite spinning on the sheath-core composite melt and the PET-PEG copolyether ester, wherein the mass ratio of the sheath-core composite melt to the PET-PEG copolyether ester is 50:50. the primary fiber is prepared by ring blowing and cooling, and then the short fiber is prepared by the working procedures of drafting, mechanical crimping, heat setting and cutting; the air speed of the circular air blowing is 1.5 m/s-2.5 m/s, and the air temperature is 20-30 ℃; the oil application rate is 18% -28%; primary stretching of the nascent fiber adopts a water bath (oil-containing agent) heating mode with relatively uniform heating, and the temperature is controlled to be between 40 ℃ and 45 ℃ relatively proper; the second stretching step needs to be carried out at a higher temperature, and steam heating is adopted, so that the temperature is controlled to be 48-55 ℃. The draft ratio is 4.0-4.3, and the first stretching ratio is controlled to be about 85% of the total stretching ratio. The fiber setting temperature is 50-65 ℃ and the setting time is 35-45 min.
Example 4
The preparation method of the high-elasticity thermal bonding polyester fiber comprises the following steps:
1) Adding a certain amount of terephthalic acid, 1, 4-butanediol, isophthalic acid and catalyst zinc acetate into a polymerization kettle, performing transesterification reaction at 190 ℃, and ending the transesterification reaction when the distilled amount of esterified water is 85% -90% of the theoretical amount. Adding polytetrahydrofuran glycol, triphenyl phosphate and a titanium potassium oxalate catalyst into the transesterification product, continuously heating to 265 ℃, slowly decompressing to less than 133Pa, carrying out polycondensation reaction for 2h, and discharging under the protection of nitrogen to obtain modified low-melting-point polyester;
2) The prepared low-melting-point modified polyester is taken as a skin layer, the trimethylene terephthalate is taken as a core layer, and the preparation method adopts
Compounding the skin and the core;
table 4 skin-core composite raw material formulation
| PTA（mol%） | IPA（mol%） | BDO（mol%） | PTMG（mol%） | Molecular weight of PTMG | Sheath-core composite ratio |
| 80 | 20 | 70 | 30 | 600 | 45/55 |
3) Putting terephthalic acid and ethylene glycol in a molar ratio of 1.0:1.2, catalyst ethylene glycol antimony and heat stabilizer trimethyl phosphate into a reaction kettle (the mass fraction of the catalyst ethylene glycol antimony is 0.5 percent relative to PTA), replacing the reaction kettle with nitrogen at 220-250 ℃ and 0.3-0.5 MPa, and adding PEG (the mass ratio of PEG to terephthalic acid is 30:100 PEG relative molecular weight 2500. After the reaction 1h is continued, slowly vacuumizing to perform polycondensation reaction; and (3) finishing the temperature rise and pressure reduction stage within about 1h, finally reducing the pressure in the kettle to 70Pa, and polymerizing under the condition that the temperature is increased from 250 ℃ to 265 ℃, wherein the evaporation amount of ethylene glycol reaches 85-90% of the theoretical value, and finishing the reaction to obtain the PET-PEG copolyether ester.
4) Carrying out parallel composite spinning on the sheath-core composite melt and the PET-PEG copolyether ester, wherein the mass ratio of the sheath-core composite melt to the PET-PEG copolyether ester is 50:50. the primary fiber is prepared by ring blowing and cooling, and then the short fiber is prepared by the working procedures of drafting, mechanical crimping, heat setting and cutting; the air speed of the circular air blowing is 1.5 m/s-2.5 m/s, and the air temperature is 20-30 ℃; the oil application rate is 18% -28%; primary stretching of the nascent fiber adopts a water bath (oil-containing agent) heating mode with relatively uniform heating, and the temperature is controlled to be between 40 ℃ and 45 ℃ relatively proper; the second stretching step needs to be carried out at a higher temperature, and steam heating is adopted, so that the temperature is controlled to be 48-55 ℃. The draft ratio is 4.0-4.3, and the first stretching ratio is controlled to be about 85% of the total stretching ratio. The fiber setting temperature is 50-65 ℃ and the setting time is 35-45 min.
Example 5
The sheath of the sheath-core composite polyester was a conventional low melting polyester, 120℃melting point, manufactured by Ningbo chemical fiber Co., ltd, as described in example 1.
Comparative example 1
The difference is that the PET-PEG copolyetherester is not spun side-by-side, except that the low melting point sheath-core polyester of the invention is used, as described in example 1.
Comparative example 2
The low melting point polyesters of the invention (trimethylene terephthalate PTT without core) were spun side-by-side with PET-PEG copolyetheresters as described in example 1.
Comparative example 3
As described in example 1, except that the core layer of the sheath-core composite polyester was conventional PET.
Comparative example 4
As described in example 1, except that the sheath-core composite polyester of the present invention was spun in parallel with conventional PET.
The short fibers prepared in examples 1 to 5 and comparative examples 1 to 4 were mixed with conventional polyester fibers in a mass ratio of 50:50, compressed into fiber aggregates in a mold, and thermoformed at a temperature of 120 to 160 ℃.
The following criteria were used for the performance test of the fiber aggregate:
hardness: according to JIS-K-6400-2-2012 (25% compression)
Hardness retention: according to JIS-K-6400-4-2012 (50% compression ﹡ ten thousand times)
Moisture regain (staple fiber): according to GB/T6503-2008 method for testing moisture regain of chemical fiber
TABLE 6 fiber Performance index
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The high-elasticity thermal bonding composite polyester fiber is characterized in that the composite polyester fiber is prepared by parallel composite spinning of sheath-core composite polyester and PET-PEG copolyether ester, and the mass ratio of the sheath-core composite polyester to the PET-PEG copolyether ester is 55: 45-50: 50; the moisture regain of the composite polyester fiber is more than 0.8%, the fiber hardness is 280-310N, and the hardness retention rate is more than 85%;
the sheath-core composite polyester skin layer is low-melting-point polyester, and the core layer is trimethylene terephthalate PTT; the sheath-core composite polyester takes low-melting point polyester as a sheath layer, takes the trimethylene terephthalate as a core layer and adopts a sheath-core composite form, and the ratio of the sheath layer to the core layer is 45: 50-55: 45;
the low-melting-point polyester is prepared by taking terephthalic acid, 1, 4-butanediol, isophthalic acid and polytetrahydrofuran glycol PTMG as raw materials through polymerization, wherein the molar ratio of terephthalic acid to isophthalic acid is 7:3-8:2, and the molar ratio of 1, 4-butanediol to polytetrahydrofuran glycol is 6: 4-8: 2, the molecular weight of PTMG is 600-1000; the melting process of the low-melting polyester is 130-160 ℃;
the preparation method of the low-melting-point polyester comprises the following steps:
1) Transesterification: adding terephthalic acid, 1, 4-butanediol, isophthalic acid and a catalyst zinc acetate into a polymerization kettle, performing transesterification reaction at 180-200 ℃, and ending the transesterification reaction when the distilled amount of esterified water is 85-90% of the theoretical amount;
2) Polycondensation reaction: adding polytetrahydrofuran glycol, triphenyl phosphate and a titanium potassium oxalate catalyst into the transesterification product, continuously heating to 250-265 ℃, slowly decompressing to less than 133Pa, carrying out polycondensation reaction for 2-3 h, and discharging under the protection of nitrogen to obtain low-melting-point polyester;
the PET-PEG copolyether ester is prepared by copolymerization reaction of terephthalic acid, ethylene glycol and polyethylene glycol PEG, wherein the molar ratio of the terephthalic acid to the ethylene glycol is 1.0:1.1-1.0:1.3, and the mass ratio of the PEG to the terephthalic acid is 25: 100-40: 100;
the preparation method of the PET-PEG copolyetherester comprises the following steps:
1) Putting terephthalic acid and ethylene glycol in a molar ratio of 1.0:1.1-1.0:1.3, ethylene glycol antimony serving as a catalyst and trimethyl phosphate serving as a heat stabilizer into a reaction kettle, replacing the reaction kettle with nitrogen at 220-250 ℃ and 0.3-0.5 MPa, and adding PEG when the receiving amount of esterification water reaches 90-95% of a theoretical value;
2) After the reaction 1h is continued, slowly vacuumizing to perform polycondensation reaction;
3) And (3) finishing the temperature rise and pressure reduction stage within 1h, finally reducing the pressure in the kettle to 70Pa, and polymerizing under the condition that the temperature is increased from 250 ℃ to 265 ℃, wherein the evaporation amount of ethylene glycol reaches 85-90% of the theoretical value, and finishing the reaction to obtain the PET-PEG copolyether ester.
2. A method for preparing the high elasticity thermal bonding composite polyester fiber according to claim 1, comprising the steps of:
1) Performing transesterification reaction and polycondensation reaction on terephthalic acid, 1, 4-butanediol, isophthalic acid and polytetrahydrofuran glycol to obtain low-melting-point polyester, and preparing the sheath-core composite polyester by taking the low-melting-point polyester as a sheath layer and taking the terephthalic acid propylene glycol ester as a core layer;
2) Carrying out copolymerization reaction on terephthalic acid, ethylene glycol and polyethylene glycol to obtain PET-PEG copolyether ester;
3) And (3) carrying out parallel composite spinning on the sheath-core composite polyester and the PET-PEG copolyether ester, carrying out annular blowing cooling to obtain primary fibers, and carrying out the processes of drafting, crimping, heat setting and cutting to obtain the short fibers.
3. The method for preparing the high-elasticity thermal bonding composite polyester fiber according to claim 2, wherein the air speed of the annular blowing air in the step 3) is 1.5-2.5 m/s, and the air temperature is 20-30 ℃; the oil application rate is 18% -28%; primary stretching is carried out on the primary fiber by adopting an oil-containing agent water bath heating mode with relatively uniform heating, and the temperature is controlled at 40-45 ℃; the second-stage stretching needs to be performed at a higher temperature, steam heating is adopted, and the temperature is controlled to be 48-55 ℃; the draft ratio is 4.0-4.3, and the first stretching ratio is controlled to be 85% of the total stretching ratio; the fiber setting temperature is 50-65 ℃ and the setting time is 35-45 min.
4. The high-elasticity filling fiber aggregate is characterized in that the filling fiber aggregate is prepared by mixing and thermoforming the composite polyester fiber according to claim 1 and other fibers, and the mass percentage of the composite polyester fiber is 10% -50%; the other fibers comprise one or more of polyester fibers, polyamide fibers, viscose fibers, cotton fibers, hemp fibers, polyacrylonitrile fibers and polypropylene fibers.
5. A highly elastic filled product comprising a filled sponge and a facing material surrounding the filled material, wherein the filled sponge is a highly elastic filled fiber assembly of claim 4.
6. The highly elastic filled product of claim 5, wherein the product is a mattress, a coaster, a shoe pad or a sofa.
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