CN102330159A

CN102330159A - Industrial yarn production process

Info

Publication number: CN102330159A
Application number: CN201110136737A
Authority: CN
Inventors: 高莉萍
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-05-25
Filing date: 2011-05-25
Publication date: 2012-01-25

Abstract

The invention discloses an industrial yarn production process which adopts the one-step method of spinning and stretching and comprises the following steps of solid phase tackification, melting spinning, high-temperature drawing, heat setting and winding forming. The innovative 5-pair hot roller drawing and heat setting process is adopted. Compared with the traditional 4-pair hot roller drawing and heat setting process, the innovative 5-pair hot roller drawing and heat setting process adopts two stages of hot drawing and two stages of heat setting, so that the drawing speed of fiber is effectively reduce, the heat setting time of the fiber is prolonged, and the fiber has uniform and stable orientation structure. The physical properties of the product are ensured, and meanwhile, the condition of spinning is optimized. The super strong industrial long polyester filament prepared by the method has the advantages of high strength, reasonable extension and dry heat contraction, good heat resistance and good impact resistance and fatigue resistance.

Description

A kind of industry silk production technology

Technical field

The invention discloses a kind of production technology of ultra high-strength terylene industry filament yarn, belong to textile technology field.

Background technology

Terylene is since coming out the fifties in last century, and the exploitation on industrial use has obtained very big progress.The strong industrial filament of terylene superelevation is widely used in to weave hanging belt, cotton rope, drag-line etc. because of it has the extra high characteristics of intensity.

At present, domestic production be generally common high-strength polyester industrial long filament, its quality is following: fracture strength is 7.8～8.0cN/dtex, dry-hot shrinkage is 8～13%, 5% load at certain elongation＜4cN/dtex.Common high strength yarn can only be used for processing the general industrial product, and compares with high performance product, and manufacturing can lift the product of same load, needs to use the precursor of more radicals, also is non-remunerative economically concerning downstream user.In recent years, because the high-strength polyester industrial long filament in extensive applications such as military equipments, is had higher requirement again for its intensity, therefore developing a kind of more high-intensity polyester industrial filament yarn seems very urgent.

We think, so man of domestic industry Silk Mill does not only produce the polyester industrial yarn product that intensity >=8.3cN/dtex and degree of stretching and dry-hot shrinkage all conform with requirement, traced it to its cause following some:

1, not enough to the research of solid-phase tack producing (SSP) technology, the importance of its relevant parameter is not caused enough attention

2, spinning speed is not enough, is merely 2000～2200m/min

3, draw roll temperature and each stage drafting multiple selection are improper; Selection to final drafting multiple on the technology is lower, is generally 4.0～5.2

4, non-selected rational loose ratio during drawing-off

Summary of the invention

The objective of the invention is to adopt the preparation technology of the ultra high-strength terylene industry filament yarn of a kind of spinning, stretching one-step method, have fracture strength height, extension at break and the rational characteristics of dry-hot shrinkage index with the polyester industrial filament yarn of this prepared.

For realizing above-mentioned purpose, the technical scheme that the present invention adopts is: a kind of preparation technology of ultra high-strength terylene industry filament yarn, adopt spinning and stretching one-step method technology, and comprising:

1, solid-phase tack producing: common PET (PET) section in polymer reactor through solid phase become can the manufacture silk the high sticking section of technical grade; The present invention preferably is employed in and accomplishes whole polycondensation process in the ridge type polymer reactor; Like this in whole polycondensation process, section is flowed in preheater with the form of laminar flow fully, so the uniformity of time of staying that can guarantee all sections in preheater; There is not mechanical agitation in the whole process flow; Solid-phase tack producing is carried out in section under the environment of a gentleness, in the tackify process, can not produce extra dust like this, has guaranteed the degree of purity and the viscosity uniformity of high sticking section; Adopt the mass flow technique of low pressure low speed to the conveying of spinning feed bin by SSP; Whole induction system all uses pure nitrogen as working media, avoids producing dust, and the screw rod inlet can not degraded owing to nitrogen protection yet.

2, melt spinning: high sticking section, through slow cooling, oils behind the lateral blowing cooling forming after the spinneret orifice ejection through the screw extruder melt extruded.

3, drawing by high temperature, HEAT SETTING: adopt 5 roller draft process, two-stage stretches, two levels of thermal is lax, 125～135 ℃ of first step draft temperatures; Draw ratio is 235～245 ℃ of 3.8～4.2, the second step draft temperatures, and draw ratio is 1.42～1.45; Total drawing ratio is 5.7～6.0, and 245～250 ℃ of first step heat setting temperatures are lax than 4.4%～4.6%; 240～250 ℃ of the second step heat setting temperatures, lax than 7.4～7.6%, the total relaxation ratio is 11%～12%; Corresponding relation and performance of products contrast table that different lax ratios and two-stage are lax:

Can be found out that by last table total lax ratio, winding tension become linear approximate relationship with fracture strength, total relaxation is bigger than more; Winding tension is more little, and the fracture strength of product is high more, but on the lax corresponding relation of two-stage; If one-level is lax excessive; It is always undesirable to spin condition, and it is apparent in view to beat on the in the end a pair of hot-rolling of strand, is easy to generate broken end.Because in relaxation, because strand tension force reduces between three pair rollers of back gradually; Several to hot-rolling on the tension force transport phenomenon apparent in view, one-level is lax excessive, causes in the secondary relaxation; The Tension Difference mutation is big in the strand; Slippage relatively between the different tow on the hot-rolling is easy to generate and jumps silk, causes broken end.Adopting the lax advantage of two-stage is the time that can prolong relaxation heat setting, make the crystalline texture of the unstable orientation texture disorientation formation large-size in the fiber, but the lax proportioning of two-stage must be rationally; To reduce the transmission of tow tension on hot-rolling as far as possible, the relative slippage of control tow on hot-rolling, so winding tension is lax than reasonably combined with 1,2 grade; Could guarantee stable spinning situation; Preferable is: 245～248 ℃ of first step heat setting temperatures are lax than 240～245 ℃ of 4.4%～4.6%, the second step heat setting temperatures; Lax than 7.5%, the total relaxation ratio is 11.9%～12.1%; The best is: 245 ℃ of first step heat setting temperatures, lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%, the total relaxation ratio is 12%.

4, coiling and molding: with above-mentioned fiber with 3000～4000 meters/minute the speed coiling and molding after obtain finished product.

Beneficial effect of the present invention is:

1, industrial silk spinning silk need highly glue section, and the section of traditional polymerization technique production can't be satisfied the requirement of industrial silk spinning silk, therefore necessary further tackify; We adopt the one-step method solid phase polycondensation process of innovation, are the ridge type structure in the polymer reactor, and section is passed through reactor with the form of laminar flow; Heat through highly purified nitrogen; And take away the small-molecule substance that reaction generates, a step is accomplished tackify, and the viscosity of section is risen to about 1.02 by 0.65.The relay that one-step technology has been avoided cutting into slices in traditional solid phase polycondensation process is carried; Prevent the back mixing of in a plurality of stills, cutting into slices; Guarantee the viscosity uniformity of the high sticking section of raw material, viscosity fluctuation is controlled in the scholar 0.015, and the dust content in the control solid phase polycondensation process is below 50PPM.And the viscosity fluctuation of traditional handicraft solid phase polycondensation generally can only control to scholar 0.025, and dust content reaches more than the 100PPM.The raw material accurate viscosity Control of cutting into slices, extremely low dust content has guaranteed under the relatively harsher process conditions of spinning silk winding, still can keep stable, for the technology adjustment in road, back provides bigger space.

2, our company's ultra high-strength terylene industry silk adopts 5 pairs of hot-rolling stretching heat setting process of innovation, compares with 4 pairs of traditional hot-rolling stretching HEAT SETTINGs, adopts 2 grades of hot-stretchs; The processing method of 2 grades of HEAT SETTINGs; Effectively reduce the draw speed of fiber, prolonged the heat-setting time of fiber, make fiber have uniform and stable orientation texture; When guaranteeing the product physical property, optimized the situation of spinning.And because hot-rolling adopts the heating of multi-region high-frequency electrical mode of heating, hot-rolling surface temperature stable homogeneous makes the technical process control stabilization, and the dry-hot shrinkage fluctuation range of fiber has been dwindled one times than traditional handicraft.

3, utilize the ultra high-strength terylene industry filament yarn of the inventive method preparation to have the good advantage of reasonable, the shock-resistant fatigue performance of fracture strength height, extension at break and dry-hot shrinkage, can satisfy the needs of downstream user well.

The specific embodiment

Embodiment one:

1, common poly terephthalic acid second two fat (PET) sections through solid phase become can the manufacture silk the high sticking section of technical grade: low viscosity PET section quantitatively feeds crystallizer through revolving valve; Under 180 ℃ of recirculated hot air effects, crystallize to degree of crystallinity 30%; Revolving valve through the band gas locking device is fed into the ridge type reactor then; In 230 ℃ nitrogen environment, carry out solid phase polycondensation; Through regulating the time of staying and nitrogen gas purity, the low sticking section of relative viscosity 0.67 is stated to the sticking section of height of relative viscosity 1.05.When high sticking section is cooled to 120 ℃, use the nitrogen induction system that the sticking section of height is transported to the screw extruder feed bin.

2, through the screw extruder melt extruded; After the spinneret orifice ejection; Through slow cooling, lateral blowing cooling forming: melt extrude in the process 300 ℃ of the melt temperatures of control screw rod outlet; Through the annealing device of 330 ℃ of too high 300mm, temperature, the lateral blowing system delay cooling through 20 ℃ of temperature, relative humidity 80% again.In this process, control is extruded fast 10m/min, spinneret draft than about 65.

3, through oil, stretching, HEAT SETTING, coiling operation, obtain having superhigh intensity, the finished product polyester industrial yarn of low-shrinkage.After oiling, tow goes on foot HEAT SETTINGs: 130 ℃ of first step draft temperatures, 240 ℃ of 4.0, the second step of draw ratio draft temperatures, draw ratio 1.45 through two steps stretching, two; 245 ℃ of first step heat setting temperatures are lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%; Total stretching ratio 5.8, total relaxation is than 12%.

Embodiment two, preparation method and equipment are with embodiment one, and different is in the step 3, and 245 ℃ of first step heat setting temperatures are lax more lax than 7.6% than 240 ℃ of 4.4%, the second step heat setting temperatures; Total relaxation is than about 12%.

Claims

1. an industry silk production technology is characterized in that adopting spinning and stretching one-step method, comprises the steps:

1) the low sticking section of solid-phase tack producing: PET in polymer reactor through solid phase become can the manufacture silk the sticking section of height;

2) melt spinning: high sticking section, through slow cooling, oils behind the lateral blowing cooling forming after the spinneret orifice ejection through the screw extruder melt extruded;

3) drawing by high temperature, HEAT SETTING: adopt 5 roller draft process, two-stage stretches, two levels of thermal is lax, 125～135 ℃ of first step draft temperatures; Draw ratio is 235～245 ℃ of 3.8～4.2, the second step draft temperatures, and draw ratio is 1.42～1.45; Total drawing ratio is 5.7～6.0, and 245～250 ℃ of first step heat setting temperatures are lax than 4.4%～4.6%; 240～250 ℃ of the second step heat setting temperatures, lax than 7.4～7.6%, the total relaxation ratio is 11%～12%;

4) coiling and molding: with above-mentioned fiber with 3000～4000 meters/minute the speed coiling and molding after obtain finished product.

2. a kind of industry silk production technology according to claim 1; It is characterized in that: 245～248 ℃ of first step heat setting temperatures are lax than 240～245 ℃ of 4.4%～4.6%, the second step heat setting temperatures; Lax than 7.5%, the total relaxation ratio is 11.9%～12.1%; The best is: 245 ℃ of first step heat setting temperatures, lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%, the total relaxation ratio is 12%.

3. a kind of industry silk production technology according to claim 1 is characterized in that: 245 ℃ of first step heat setting temperatures are lax than 240 ℃ of 4.4%, the second step heat setting temperatures, lax than 7.6%; Total relaxation is than about 12%.

4. a kind of industry silk production technology according to claim 1 is characterized in that: 130 ℃ of first step draft temperatures, 240 ℃ of 4.0, the second step of draw ratio draft temperatures, draw ratio 1.45; 245 ℃ of first step heat setting temperatures are lax than 240 ℃ of 4.5%, the second step heat setting temperatures, lax than 7.5%; Total stretching ratio 5.8, total relaxation is than 12%.

5. a kind of industry silk production technology according to claim 1, it is characterized in that: said polymer reactor is the ridge type polymer reactor.

6. a kind of industry silk production technology according to claim 1, it is characterized in that: spinning silk winding speed is 3000～4000 meters/minute.