CN102409431A - Preparation method of hydrolytic resistant polyester monofilament for high-speed papermaking mesh - Google Patents
Preparation method of hydrolytic resistant polyester monofilament for high-speed papermaking mesh Download PDFInfo
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- CN102409431A CN102409431A CN2011103602451A CN201110360245A CN102409431A CN 102409431 A CN102409431 A CN 102409431A CN 2011103602451 A CN2011103602451 A CN 2011103602451A CN 201110360245 A CN201110360245 A CN 201110360245A CN 102409431 A CN102409431 A CN 102409431A
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Abstract
The invention discloses a preparation method of a hydrolytic resistant polyester monofilament for a high-speed papermaking mesh. In the method, the monofilament is prepared by performing mixed melt spinning on a self-restraint master batch and a high-viscosity polyester chip, wherein the self-restraint master batch is a master batch which is developed and researched in a self-actuated way by adding powdery carbodiimide and other efficient auxiliary aids and has hydrolytic resistance. The preparation method comprises the following steps of: adding carbodiimide, an auxiliary acid and polyethylene terephthalate (PET) according to a proportion, performing melt extrusion, and thus obtaining a unique hydrolytic resistant master batch; and mixing the hydrolytic resistant master batch and the high-viscosity polyester chip, drying, performing melt spinning, cooling for molding, drafting, performing heat setting, and the like. In the method, the hydrolytic resistance of polyester is improved by the self-restraint hydrolytic resistant master batch. Compared with a method for directly adding a liquid hydrolytic agent during spinning, the method has the characteristics of high spinning property, difficulty in monofilament breaking, low volatilization loss of active ingredients, dispersion uniformity of hydrolytic agents, diameter uniformity of products and the like, and can be widely applied in industrial meshes of high-speed papermaking machines and the like.
Description
Technical field
The present invention relates to a kind of production technology of chemical fibre spinning, belong to the fiberizing technical field, particularly relate to the preparation method of a kind of high speed papermaking wire-cloth with anti-hydrolysis monofilament polyester.
Background technology
China's paper-making industry is just experiencing the stage of a demand rapid growth, and national paper and paperboard production are 7,350 ten thousand tons, and 7,290 ten thousand tons of consumption figures all occupy the second in the world.And along with the world to the continuous enhancing of environmental protection consciousness and the requirement of social progress; People pay attention to the utilization of renewable resource further; From environmental protection, many-sided considerations such as production cost and raw material sources, worldwide the usage ratio that reclaims paper pulp is improved constantly.It is reported that the more kind of waste paper dosage has newsprint, package paper, white board, boxboard, fluting medium.Based on above situation, make that the chemical composition of paper making pulp is very complicated in the modern paper industry, the employings of various paper making wet part chemical assistants etc. all can propose austere requirement because to the durability and the hydrolytic resistance of papermaking polyester webs.
In addition, aging, be the problem that most of organic materials are difficult to avoid, for the papermaking polyester webs, main aging be in doing net.Especially along with the continuous progress of modern paper equipment and improving constantly of the papermaking speed of a motor vehicle, the baking temperature after the paper moulding must improve thereupon, promptly so-called force drying; Temperature can reach 170 ℃, so under the high temperature, owing to there is not l Water Paper to take away heat; The polyester selvage; The woven dried net of conventional polyester monofilament can't satisfy instructions for use at all, makes the life-span of net further shorten.As everyone knows, weaving of paper grade (stock) polyester webs is a physical process, and for this reason, we must try every possible means in the process of making monofilament polyester.Therefore, develop and be fit to modern paper industrial development needs, high-performance, anti-hydrolysis, the monofilament polyester that processing characteristics is excellent increase its durability, prolong the life-span of papermaking polyester webs as far as possible, are the another new problems of researching and developing as monofilament polyester.
Summary of the invention
The objective of the invention is to; The preparation method of a kind of high speed papermaking wire-cloth with anti-hydrolysis monofilament polyester is provided; Technical problem to be solved is through the anti-hydrolysis master batch of self-control, increases the hydrolytic resistance ability of polyester, directly adds liquid hydrolysis-resisting agent during with spinning and compares; Have and be uniformly dispersed the characteristics such as the filament diameter deviation is little of spinning.
The object of the invention and solve its technical problem and adopt following technical scheme to realize.A kind of high speed papermaking wire-cloth that proposes according to the present invention is with the preparation method of anti-hydrolysis monofilament polyester, and comprise step: 1) dried high viscosity polyester being cut into slices places agitator to mix with the carbodiimide modified auxiliary material in proportion; 2) composite material is sent in the screw rod melt extruded machine, heating and melting is extruded, and processes modified master batch; 3) above-mentioned modified master batch is mixed with conventional polyester in proportion, gets into spinning machine and extrude, and in water cooling forming, behind succeeding stretch, carry out HEAT SETTING, reel after eliminating static through oiling then, process finished product.
The preparation method of the modified master batch in the said step 1) is:
Respectively titanate esters, carbonate superfine powder 1～2 weight portion, the high viscosity polyester of powdery carbodiimide 2～4 weight portions, 0.2～0.5 weight portion 100 weight portions of cutting into slices are dropped into high-speed mixer successively and mix; Again mixture is passed through heating and melting, screw extruder extrusion temperature scope is 260～300 ℃; Polyester mixture to after the dehumidifying carries out blank, makes particle diameter and keeps the consistent modified master batch of particle diameter of cutting into slices with original high viscosity polyester.
Said high viscosity polyester section is the PET section of section
.
In the step 3), modified master batch joins in the high viscosity polyester section dry together behind the stirring and evenly mixing, sends in the screw rod melt extruded machine, and the processing extrusion temperature is controlled at 260～300 ℃, the compound heating and melting after spinnerets extrude.
The weight portion proportioning that feeds intake between said polyester slice with high viscosity and the modified master batch is 100: 5～10; Baking temperature is 150～170 ℃, and be 4～6 hours drying time.
In the step 3), the above-mentioned spun filament of extruding from spinnerets gets into 50～75 ℃ of water to be cooled off, and in 80～98 ℃ of hot water, carries out the drawing-off first time; And in hot-air oven, carry out roller drawing-off for the second time, 180～220 ℃ of temperature.
Monofilament polyester after the moulding carries out being 2～5.5 double-length degree of raw footage after the drawing-off for the first time; Behind the succeeding stretch 1.1～3 double-length degree of raw footage.
In the step 3), the temperature of hot blast is controlled between 190～240 ℃ in the heat setting process.
High speed papermaking wire-cloth of the present invention with the advantage that the preparation method of anti-hydrolysis monofilament polyester has is:
1) the present invention melt extrudes and processes modified master batch through adding the anti-hydrolysis auxiliary addition agent of self-control, polyester (PET); To resist the hydrolysis master batch to mix with polyester slice with high viscosity again, and process the polyester papermaking wire-cloth with anti-hydrolysis through steps such as super-dry, melt spinning, cooling forming, drawing-off, HEAT SETTINGs and use monofilament, this modification by copolymerization spinning technique is simple, and is convenient, implements easily.
Characteristics such as the liquid hydrolysis-resisting agent of direct interpolation is compared during 2) with spinning, has good spinnability, is difficult for fracture of wire, and effective ingredient volatilization loss is few, and hydrolysis-resisting agent is uniformly dispersed, and the product diameter is even.
3) the polyester papermaking wire-cloth produced of the present invention is used monofilament, strand smooth surface, stable performance; Roundness is good, and yield rate is high, is particularly useful for the papermaking forming web and the dried net that under high speed, high temperature, super-humid conditions, operate; Can play the delaying aging time, increase the effect in service life.
Description of drawings
Fig. 1 is preparation technology's flow chart of modified master batch of the present invention.
Fig. 2 is the process chart of the blend melt spinning of high-viscosity polyester of the present invention.
The specific embodiment
From molecular structure, polyester as papermaking wire-cloth in use with monofilament, especially under papermaking forming web and the harsh environment for use of dried net at high temperature, high humidity, material degradation and problem that the filament properties that causes descends just comes out.Because polyester molecule is unbranched linear polymer, ester bond C-O wherein is a weakest link, is prone to issue unboiled water inducing of external cause and separates fracture and generate carboxyl and (COOH), cause the decline of molecular weight, influence the mechanical property of product.In addition, the existence of carboxyl under hot conditions, also can be quickened a series of degradation reactions such as thermal degradation except the water degraded; The consequence that causes is exactly that the monofilament tensile strength descends, and elongation reduces, and fragility increases; The coarse increase of monofilament surface makes gauze lose use value, even fracture.Therefore, how handling at hydrone and the carboxyl of papermaking polyester webs in operation, is key problem in technology of the present invention.
It is main raw material that the present invention adopts the polyester slice with high viscosity of section
; Add special compound additive; It is gone ahead of the rest and water and carboxyl reaction; Reduce this bimolecular combination; And adjust from the regularity and the degree of crystallinity of the structure of molecule, it is more suitable in papermaking wire-cloth processing and the demand used, particularly for doing the net warp.
Technology of the present invention is to be main raw material with the polyester slice with high viscosity, adds special additive, and prepares functional master batch, utilizes the co-blended spinning technology to be prepared from.This additive is a kind of multicomponent composite modifier, and its main component is the compound system of anti-hydrolysis stabilizer carbodiimide (pulvis) and inorganic superfine powder body.When they and high-viscosity polyester blend at high temperature, because molecular motion becomes fierce, the molecule of modifier penetrates between the macromolecular chain of polyester; Through attracting each other of its ester group polarity; Form a stable co-mixing system, the long nonpolar alkane chain of additive has then hindered the approaching each other of polyester molecule chain, reduces big intermolecular winding; The warm-up movement of strand becomes easily, thereby has improved the flowability and the spinnability of high-viscosity polyester melt.
The preparation embodiment of modified master batch
1) surface modification of inorganic superfine powder body
The inorganic superfine powder body is because granularity is little, specific area is big, and it has high surface energy, shows as hydrophily, reunites easily; Polyester Fibers is low-energy surface then, shows as hydrophobicity, and both are incompatible.Because the difference of organic and inorganic material surface energy makes ultrafine inorganic powder in the organic polymer objects system, be difficult to even dispersion, assemble agglomeratingly easily, cause when spinning, cause screen pack and spinneret orifice to stop up, spinning pressure raises, and the lousiness phenomenon that breaks end occurs.In order to improve compatibility and the dispersiveness of inorganic particle in polyester fondant, must carry out surface modification treatment to it.
Select for use titanate coupling agent that the carbonate superfine powder is carried out surface modification; Through alkyl group in the coupling agent and powder surface active site generation chemical reaction; And constitute inorganic particle and be connected with bridging between organic matrix; And realize surface modification to powder, and it can evenly be disperseed in polyester fondant, be difficult for reuniting.
2) preparation of modified master batch
The double screw extruder that adopts
; Preparation property-modifying additive master batch: step 1); Respectively the high viscosity polyester section (PET section) of the titanate esters of the carbon ester salt ultrafine inorganic powder of the hydrolysis-resisting agent powdery carbodiimide of 2～4 weight portions, 1～2 weight portion, 0.2～0.5 weight portion, 100 weight portions being dropped into high-speed mixer successively mixes; Again mixture is passed through the screw extruder heating and melting, temperature is controlled to be between 260 ℃～300 ℃; Step 2), dried polyester mixture is carried out blank, it is consistent with the particle diameter of original high viscosity polyester section that particle diameter keeps, and makes modified master batch.
The high speed papermaking wire-cloth is with the preparation embodiment of anti-hydrolysis monofilament polyester
High viscosity ([η] >=0.9) high viscosity polyester of 100 weight portions section (PET section) is added the modified master batch of 5～10 weight portions, mix, drying 4～6 hours together under 150～170 ℃; Above-mentioned dried compound is sent in the screw rod melt extruded machine, and heating and melting is extruded, and wherein, the processing temperature of extruding of screw extruder is 260 ℃～300 ℃, extrudes through spinnerets; The former raw silk that spinnerets is extruded enters into 50～75 ℃ of water and cools off, and is 2～5.5 double-length degree of raw footage with the monofilament polyester after the moulding through carrying out drawing-off for the first time in 80～98 ℃ of hot water; Then, again in 180～220 ℃ of hot blasts succeeding stretch be 11～3 double-length degree of raw footage; Finalize the design through 190～240 ℃ of hot blasts at last; Monofilament is through the elimination static that oils, and coiling makes finished product.
Below through various effect experimental examples the high speed papermaking wire-cloth of the foregoing description preparation is tested with each item performance of anti-hydrolysis monofilament polyester:
(1) Mechanics Performance Testing of anti-hydrolysis monofilament
By the mechanical property (contract technical indicator and actual measurement index) of the anti-hydrolysis monofilament of the foregoing description preparation shown in table 1, table 2.
Table 1 monofilament contract technical requirement
| Model | 0.50mm | 0.52mm×0.335mm |
| Diameter deviation (mm) | ±0.015 | (±0.15)×(±0.01) |
| Ultimate strength (N) | ≥105 | ≥90 |
| Elongation at break (%) | 30±5 | 30±5 |
| Dry-hot shrinkage % (180 ℃ * 20min) | 7.5±1 | 7.5±1 |
Table 2 monofilament test data index
| Model | 0.50mm | 0.52mm×0.335mm | Judge |
| Diameter (mm) | 0.510 | 0.57×0.335 | Meet |
| Ultimate strength (N) | 115 | 100 | Meet |
| Elongation at break (%) | 32 | 33 | Meet |
| Dry-hot shrinkage % (180 ℃ * 20min) | 7.6 | 7.4 | Meet |
Visible by table 1 and table 2, its diameter deviation of new polyester monofilament, ultimate strength, elongation at break, all in indication range, it is 95% that the monofilament percentage of A-class goods surpasses to data such as dry-hot shrinkage, has reached the requirement of contract technical indicator.
(2) the high speed papermaking wire-cloth is with the anti-hydrolysising experiment and the analytical method of anti-hydrolysis monofilament polyester
Laboratory apparatus: high-potting still temperature: 130 ℃/1.7bar
Monofilament is put into the high-potting still heat, every got at a distance from 24 hours once kind, each item indexs such as detected intensity, percentage elongation, and compare with original monofilament, analyze the degree of aging of monofilament from retained strength.Experimental data is seen table 3.
Table 3 compares the percentage of strength-retention (%) with green strength
| The experiment fate | Zero (original) | One | Two | Three | Four | Five |
| Common monofilament | 100％ | 86.60％ | 3.30％ | |||
| Anti-hydrolyzed-silk | 100％ | 94.30％ | 92.80％ | 91.40％ | 48.60％ | 4.30％ |
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction; Former every technical scheme content of the present invention that do not break away from, all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (8)
1. a high speed papermaking wire-cloth is characterized in that comprising step with the preparation method of anti-hydrolysis monofilament polyester:
1) place agitator to mix in proportion with the carbodiimide modified auxiliary material dried high viscosity polyester section;
2) composite material is sent in the screw rod melt extruded machine, heating and melting is extruded, and processes modified master batch;
3) above-mentioned modified master batch is mixed with conventional polyester in proportion, gets into spinning machine and extrude, and in water cooling forming, behind succeeding stretch, carry out HEAT SETTING, reel after eliminating static through oiling then, process finished product.
2. preparation method according to claim 1; It is characterized in that: the preparation method of the modified master batch in the said step 1) is: respectively titanate esters, carbonate superfine powder 1～2 weight portion, the high viscosity polyester of powdery carbodiimide 2～4 weight portions, 0.2～0.5 weight portion 100 weight portions of cutting into slices are dropped into high-speed mixer successively and mix; Again mixture is passed through heating and melting, screw extruder extrusion temperature scope is 260～300 ℃; Polyester mixture to after the dehumidifying carries out blank, makes particle diameter and keeps the consistent modified master batch of particle diameter of cutting into slices with original high viscosity polyester.
3. preparation method according to claim 1 is characterized in that: said high viscosity polyester section is the PET section of section
.
4. preparation method according to claim 2; It is characterized in that: in the step 3), modified master batch joins in the high viscosity polyester section dry together behind the stirring and evenly mixing, sends in the screw rod melt extruded machine; Processing extrusion temperature be controlled at 260～300 ℃, the compound heating and melting after spinnerets extrude.
5. preparation method according to claim 1 is characterized in that: the weight portion proportioning that feeds intake between said polyester slice with high viscosity and the modified master batch is 100:5～10; Baking temperature is 150～170 ℃, and be 4～6 hours drying time.
6. preparation method according to claim 1 is characterized in that: in the step 3), the above-mentioned spun filament of extruding from spinnerets gets into 50～75 ℃ of water to be cooled off, and in 80～98 ℃ of hot water, carries out the drawing-off first time; And in hot-air oven, carry out roller drawing-off for the second time, 180～220 ℃ of temperature.
7. preparation method according to claim 6 is characterized in that: the monofilament polyester after the moulding carries out being 2～5.5 double-length degree of raw footage after the drawing-off for the first time; Behind the succeeding stretch 1.1～3 double-length degree of raw footage.
8. preparation method according to claim 1 is characterized in that: in the step 3), the temperature of hot blast is controlled between 190～240 ℃ in the heat setting process.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422181A (en) * | 2013-08-05 | 2013-12-04 | 福建景丰科技有限公司 | Chinlon high-speed spinning technology |
| CN103627152A (en) * | 2013-12-19 | 2014-03-12 | 上海朗亿功能材料有限公司 | High-performance hydrolysis resistant PET (polyethylene terephthalate) master batch and preparation method thereof |
| CN103741252A (en) * | 2013-12-27 | 2014-04-23 | 马海燕 | Large-diameter polyester monofilament based on hydrolysis resistance and production method thereof |
| CN104313723A (en) * | 2014-10-15 | 2015-01-28 | 吴竟成 | Preparation method of self-lubricating high-wear-resisting industrial monofilament for papermaking net |
| CN110747532A (en) * | 2019-10-21 | 2020-02-04 | 宁波百厚海洋科技有限公司 | High-anti-fouling low-temperature-resistant polyester monofilament and production method thereof |
| CN113622048A (en) * | 2021-08-06 | 2021-11-09 | 浙江巴斯特网丝有限公司 | Preparation method of polyester monofilament for papermaking mesh |
| CN113831728A (en) * | 2020-06-24 | 2021-12-24 | 中国石油化工股份有限公司 | Hydrolysis-resistant high-toughness nylon pipe composition and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422181A (en) * | 2013-08-05 | 2013-12-04 | 福建景丰科技有限公司 | Chinlon high-speed spinning technology |
| CN103627152A (en) * | 2013-12-19 | 2014-03-12 | 上海朗亿功能材料有限公司 | High-performance hydrolysis resistant PET (polyethylene terephthalate) master batch and preparation method thereof |
| CN103741252A (en) * | 2013-12-27 | 2014-04-23 | 马海燕 | Large-diameter polyester monofilament based on hydrolysis resistance and production method thereof |
| CN103741252B (en) * | 2013-12-27 | 2015-09-16 | 马海燕 | A kind of large-diameter polyester monofilament based on resistant to hydrolysis and production method thereof |
| CN104313723A (en) * | 2014-10-15 | 2015-01-28 | 吴竟成 | Preparation method of self-lubricating high-wear-resisting industrial monofilament for papermaking net |
| CN110747532A (en) * | 2019-10-21 | 2020-02-04 | 宁波百厚海洋科技有限公司 | High-anti-fouling low-temperature-resistant polyester monofilament and production method thereof |
| CN113831728A (en) * | 2020-06-24 | 2021-12-24 | 中国石油化工股份有限公司 | Hydrolysis-resistant high-toughness nylon pipe composition and preparation method thereof |
| CN113831728B (en) * | 2020-06-24 | 2023-10-20 | 中国石油化工股份有限公司 | Hydrolysis-resistant high-toughness nylon pipe composition and preparation method thereof |
| CN113622048A (en) * | 2021-08-06 | 2021-11-09 | 浙江巴斯特网丝有限公司 | Preparation method of polyester monofilament for papermaking mesh |
| CN113622048B (en) * | 2021-08-06 | 2023-11-07 | 浙江巴斯特网丝有限公司 | Preparation method of polyester monofilament for papermaking net |
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Application publication date: 20120411 |