CN103422280B - The crystalline substance of a kind of cotton/linen blend yarn becomes method of modifying - Google Patents
The crystalline substance of a kind of cotton/linen blend yarn becomes method of modifying Download PDFInfo
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- CN103422280B CN103422280B CN201310318142.8A CN201310318142A CN103422280B CN 103422280 B CN103422280 B CN 103422280B CN 201310318142 A CN201310318142 A CN 201310318142A CN 103422280 B CN103422280 B CN 103422280B
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Abstract
The crystalline substance that the present invention relates to a kind of cotton/linen blend yarn becomes method of modifying, is that cotton/linen blend yarn is placed in closed container, is filled with modification medium, boost to modifier pressure, then abrupt release pressure, removes modification medium, namely obtains brilliant change modification cotton/linen blend yarn.The present invention adopts the advantage of above technical scheme as follows: 1, reach modification object by changing lattice structure, modified yarn overcomes its native defect, hole increases, degree of crystallinity reduces, soft yarns, improves the DIMENSIONAL STABILITY of product, flexibility and dyeability etc.2, adopt the method for abrupt release pressure, modified yarn farthest expanded, significantly improves bulkiness and the flexibility of yarn, thus significantly improve the spinning of yarn, knit, metachromia energy.
Description
Technical field
The crystalline substance that the present invention relates to a kind of cotton/linen blend yarn becomes method of modifying, specifically a kind of by modification medium being pressurized to modifier pressure and the cotton/linen blend yarn brilliant change method of modifying of abrupt release pressure after pressurize a period of time.
Background technology
Cotton/linen blend yarn is formed by certain proportioning blending by cotton fiber and linen fibre, and blending makes cotton fiber and linen fibre be formed to have complementary advantages, both improved hard, the easy wrinkle resistance of flax, maintained again the moisture permeability that it is good.But due to stiffening, scratchy, the shortcoming such as difficulty is spun, difficulty is knitted, difficulty contaminates of flax, it is far from being enough for only improving yarn property by blending.
In order to change above-mentioned present situation, existing a variety of method of modifying, as physical modification method, chemical modification method and biological modified method.Physical modification method mainly comprises discharge technology modification, high steam dodges quick-fried modification, ultrasonic cavitation and microwave irradiation modification, liquefied ammonia are processing modified etc.Chemical modification method mainly comprises esters modification, ethers modification, graft modification and cross-linking modified etc.
The method of modifying having formed now industrialization production both at home and abroad mainly contains the processing modified and alkali mercerized modification of liquefied ammonia.Liquid ammonia modified and alkali mercerized process has similar effect, as features such as natural crimp disappearance, cross section change circle, inner chamber diminish, but the residual alkali lye of alkali mercerized modification is not easily removed and yarn also can be caused to melt erosion and inhomogeneities, and topmost difference is that liquid ammonia modified effect is better than alkali mercerized modification.The domestic liquefied ammonia that utilizes is as modification medium, in the collect yarn of conventional boosting-pressurize in closed container-again, the method for modification medium only has certain effect to cotton, and the method for once modification, swelling not thoroughly, degree of crystallinity reduce not obvious, dyeability do not have be improved significantly.
Summary of the invention
The crystalline substance that the object of this invention is to provide a kind of cotton/linen blend yarn becomes method of modifying, specifically a kind of by modification medium being pressurized to modifier pressure and the cotton/linen blend yarn brilliant change method of modifying of abrupt release pressure after pressurize a period of time.
The crystalline substance of a kind of cotton/linen blend yarn of the present invention becomes method of modifying, is that cotton/linen blend yarn is placed in closed container, is filled with modification medium, boost to modifier pressure, then abrupt release pressure, removes modification medium, namely obtains brilliant change modification cotton/linen blend yarn.Its principle is: cotton/linen blend yarn is placed in closed container, and this closed container can movable sealing under under high pressure movable sealing and negative pressure, and zero leakage.By pressure balance topping up and non-equilibrium constant speed topping up, adjustable be filled with modification medium in closed container flow, time and temperature, thus the rate of change of the regulation and control pressure of modification, two-phase interface and above-mentioned parameter, and then the running parameter such as the permeability of regulation and control liquid medium, infiltration rate and evaporation rate; Regulate the dwell time of modifier pressure simultaneously; Above-mentioned technique can make the diffusion coefficient of modification medium improve, modification medium penetrates in yarn tissue preferably, the intermolecular hydrogen bond network of reconstruct yarn fibers, change the microstructure of yarn fibers, the motion of aggravation macromolecular chain segment, make the intermolecular generation swelling action of yarn fibers, hole increases, degree of crystallinity reduces, and achieves the once regulation and control of yarn lattice structure.Again by high speed overflow, a large amount of liquid modified medium in abrupt release closed container, huge pressure reduction is produced instantaneously at yarn organization internal and outside, form high speed quick-fried swollen, the diffusion coefficient of modification medium is significantly improved, Perfect Reconstruction yarn fibers intermolecular hydrogen bond network, the intermolecular swelling action of yarn fibers is more thorough, hole increases obviously, and degree of crystallinity significantly reduces, and achieves the secondary regulation and control of yarn lattice structure.Finally adopt heating and vacuumize the parallel method of evaporating modification medium removed in cotton/linen blend yarn and namely complete described crystalline substance change method of modifying.Brilliant become modified cotton/linen blend yarn to have softness excellent, wrinkle resistant nonshrink, durable fluffy, significantly improve the spinning of yarn, knit, metachromia energy, become remarkable and newly spin material.
As preferred technical scheme:
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, and the fineness of described cotton/linen blend yarn is 7 ~ 80, and blending rate is 5 ~ 95:95 ~ 5 in mass ratio.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, by twice intermolecular hydrogen bond network of reconstruct yarn fibers, achieve the secondary regulation and control of yarn lattice structure, make the intermolecular swelling action of yarn fibers more thorough, hole obviously increases, and degree of crystallinity obviously reduces, and dye-uptake improves, COLOR FASTNESS improves, and finally adopts heating and vacuumize the parallel method of evaporating modification medium removed in cotton/linen blend yarn namely to complete described crystalline substance change modification.Crystalline substance described in employing becomes method of modifying, and can make the microcosmic lattice of brilliant change modification cotton/linen blend yarn compared with the microcosmic lattice of described cotton/linen blend yarn, hole increases 11% ~ 16%, and degree of crystallinity reduces 12 ~ 19%; Described crystalline substance becomes modification cotton/linen blend yarn compared with described cotton/linen blend yarn, and dye-uptake improves 20% ~ 35%, and COLOR FASTNESS improves 17% ~ 21%.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, and modification medium is liquefied ammonia; Modification medium need possess following three point patterns: 1) have excellent diffusivity; 2) hydrogen bond that can be a large amount of with the intermolecular formation of yarn fibers, the intermolecular hydrogen bond network of reconstruct yarn fibers, improves the swelling behavior of yarn; 3) be easy to phase transformation regulation and control, be convenient to modification medium evaporation and reclaim.And liquefied ammonia has, and molecular weight is little, viscosity is little, surface tension is little, be easy to the special physical property such as phase transformation, these special natures make liquefied ammonia meet above-mentioned three features.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, modifier pressure abrupt release, produces larger pressure differential instantaneously, significantly can improve the diffusion coefficient of modification medium, cotton/linen blend yarn being produced fully swelling, is the brilliant critical process process becoming modification.To different cottons/linen blend yarn, the modifier pressure of requirement is different, and the speed of earth pressure release is different, and the pressure differential produced instantaneously is different, under the prerequisite not improving modifier pressure, obtain release pressure high as far as possible poor, modifier pressure should be made to drop to negative pressure.To cotton/linen blend yarn, modifier pressure needs to be more than or equal to 0.5MPa, can reach 1.5MPa.Therefore described modifier pressure P should be 0.5 ~ 1.5MPa.Poor for obtaining high as far as possible release pressure, modifier pressure should be made to drop to negative pressure, therefore the abrupt release of modifier pressure, require modifier pressure drop to instantaneously modifier pressure 1% and below.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, and in order to specification technological standards, described pressure refers to absolute pressure.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, obtain excellent swelling effect, require that the time that pressure drops to 1% of modifier pressure from modifier pressure is less than or equal to 5.0 seconds, be advisable at 1 second ~ 5 seconds, therefore the moment of described release pressure is 1 second ~ 5 seconds, and the rate of pressure reduction of corresponding described release pressure is 0.5MPa/s ~ 2MPa/s.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, for obtaining the good diffusivity of modification medium and best modified effect, and modifying process energy ezpenditure is minimum, need to regulate and control the flow of ammoniacal liquor in filling process, time and temperature, reach the object of regulation and control pressure, and then regulation and control medium permeability, infiltration rate, evaporation rate, evaporation rate and phase transition process.And boost process is one of most important influence factor, different boost process need be adopted to different yarns, a large number of experiments show that: cotton/linen blend yarn is applicable to linear boosting, and rate of pressure rise k meets relational expression
wherein t is pressure rising time, k
0for initial boost speed; For cotton/linen blend yarn, initial boost speed k
0be not less than 0.5MPa/min, can 1MPa/min be reached.Therefore described initial boost speed k
0within the scope of 0.5MPa/min ~ 1MPa/min.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, in modifying process, after boosting, pressurize a period of time is to make modification medium can penetrate into more fully in yarn institutional framework, better completes the intermolecular hydrogen bond network reconstruct of yarn fibers.It is all necessary that this process becomes modification to the crystalline substance of all yarns.To cotton/linen blend yarn, more than pressurize 1min after boosting, the dwell time is advisable at 1 ~ 10min, and therefore after described boosting, the dwell time is 1 ~ 10min.
The crystalline substance of a kind of cotton/linen blend yarn as above becomes method of modifying, after twice reconstruct of the intermolecular hydrogen bond network of yarn, remove modification medium to be absolutely necessary technical process, this process does not affect the lattice structure of yarn, but how high efficiency, low energy consumption, this process that completes that is pollution-free, zero-emission are the key factors realizing large-scale industrial production, this directly will affect the brilliant vitality becoming method of modifying, high efficiency, low energy consumption, the completing this process and separate case will write series of patents statement again of pollution-free, zero-emission about how.Removing modification medium described in this case is the modification medium adopting heating and vacuumize in parallel method of evaporating removal cotton/linen blend yarn.
Beneficial effect:
The present invention adopts the advantage of above technical scheme as follows:
1. the present invention reaches modification object by changing crystal structure.Yarn after modification overcomes its native defect, and hole increases, degree of crystallinity reduces, soft yarns, improves the DIMENSIONAL STABILITY of product, flexibility, level-dyeing property and dyeability etc.
2. the present invention adopts the method for abrupt release pressure, makes the maximum swelling sudden strain of a muscle of modified yarn quick-fried, and softness is excellent, wrinkle resistant nonshrink, durable fluffy, significantly improves the spinning of yarn, knits, metachromia energy, becomes remarkable and newly spins material.
Detailed description of the invention
Below in conjunction with detailed description of the invention, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiment 1
The crystalline substance of cotton/linen blend yarn becomes a method of modifying, is 95:5(mass ratio by blending rate) 7 cottons/linen blend yarn be placed in closed container, be filled with liquefied ammonia, linearly boosting mode boosting, rate of pressure rise k meets relational expression
initial boost speed k
0for 0.5MPa/min, boost to modifier pressure 0.5Mpa, pressurize 1min, then in 5 seconds with the rate of pressure reduction abrupt release of 0.5MPa/s to 0.005Mpa.Then adopt the heating method of evaporating parallel with vacuum pump evacuation to remove modification medium, until pressure reduces to 133Pa in closed container, now namely acquisition is brilliant becomes modification cotton/linen blend yarn.Described crystalline substance becomes the microcosmic lattice of modification cotton/linen blend yarn compared with the microcosmic lattice of described cotton/linen blend yarn, and hole increases 11%, and degree of crystallinity reduces 12%; Described crystalline substance becomes modification cotton/linen blend yarn compared with described cotton/linen blend yarn, and dye-uptake improves 20%, and COLOR FASTNESS improves 17%.
Embodiment 2
The crystalline substance of cotton/linen blend yarn becomes a method of modifying, is 50:50(mass ratio by blending rate) 20 cottons/linen blend yarn be placed in closed container, be filled with liquefied ammonia, linearly boosting mode boosting, rate of pressure rise k meets relational expression
initial boost speed k
0for 0.5MPa/min, boost to modifier pressure 0.8Mpa, pressurize 5min, then in 5 seconds with the rate of pressure reduction abrupt release of 0.5MPa/s to 0.008Mpa.Then adopt the heating method of evaporating parallel with vacuum pump evacuation to remove modification medium, until pressure reduces to 133Pa in closed container, now namely acquisition is brilliant becomes modification cotton/linen blend yarn.Described crystalline substance becomes the microcosmic lattice of modification cotton/linen blend yarn compared with the microcosmic lattice of described cotton/linen blend yarn, and hole increases 12%, and degree of crystallinity reduces 15%; Described crystalline substance becomes modification cotton/linen blend yarn compared with described cotton/linen blend yarn, and dye-uptake improves 25%, and COLOR FASTNESS improves 18%.
Embodiment 3
The crystalline substance of cotton/linen blend yarn becomes a method of modifying, is 20:80(mass ratio by blending rate) 32 cottons/linen blend yarn be placed in closed container, be filled with liquefied ammonia, linearly boosting mode boosting, rate of pressure rise k meets relational expression
initial boost speed k
0for 1MPa/min, boost to modifier pressure 1Mpa, pressurize 8min, then in 2 seconds with the rate of pressure reduction abrupt release of 0.5MPa/s to 0.001Mpa.Then adopt the heating method of evaporating parallel with vacuum pump evacuation to remove modification medium, until pressure reduces to 133Pa in closed container, now namely acquisition is brilliant becomes modification cotton/linen blend yarn.Described crystalline substance becomes the microcosmic lattice of modification cotton/linen blend yarn compared with the microcosmic lattice of described cotton/linen blend yarn, and hole increases 15%, and degree of crystallinity reduces 13%; Described crystalline substance becomes modification cotton/linen blend yarn compared with described cotton/linen blend yarn, and dye-uptake improves 29%, and COLOR FASTNESS improves 18%.
Embodiment 4
The crystalline substance of cotton/linen blend yarn becomes a method of modifying, is 5:95(mass ratio by blending rate) 80 cottons/linen blend yarn be placed in closed container, be filled with liquefied ammonia, linearly boosting mode boosting, rate of pressure rise k meets relational expression
initial boost speed k
0for 1MPa/min, boost to modifier pressure 1.5Mpa, pressurize 10min, then in 1 second with the rate of pressure reduction abrupt release of 2MPa/s to 0.0015Mpa.Then adopt the heating method of evaporating parallel with vacuum pump evacuation to remove modification medium, until pressure reduces to 133Pa in closed container, now namely acquisition is brilliant becomes modification cotton/linen blend yarn.Described crystalline substance becomes the microcosmic lattice of modification cotton/linen blend yarn compared with the microcosmic lattice of described cotton/linen blend yarn, and hole increases 16%, and degree of crystallinity reduces 19%; Described crystalline substance becomes modification cotton/linen blend yarn compared with described cotton/linen blend yarn, and dye-uptake improves 35%, and COLOR FASTNESS improves 21%.
Claims (4)
1. the crystalline substance of cotton/linen blend yarn becomes a method of modifying, it is characterized in that: cotton/linen blend yarn is placed in closed container, is filled with modification medium, boost to modifier pressure, then abrupt release pressure, removes modification medium, namely obtains brilliant change modification cotton/linen blend yarn; Described modification medium is liquefied ammonia; 1min ~ 10min is kept after boosting; Described modifier pressure P is 0.5 ~ 1.5MPa, described abrupt release pressure be finger pressure drop to instantaneously described modifier pressure 1% and following; Pressure is absolute pressure; Describedly refer to 1 second ~ 5 seconds instantaneously, the rate of pressure reduction of described release pressure is 0.5MPa/s ~ 2MPa/s.
2. the crystalline substance of a kind of cotton/linen blend yarn according to claim 1 becomes method of modifying, and it is characterized in that, the fineness of described cotton/linen blend yarn is 7 ~ 80, and blending rate is 5 ~ 95:95 ~ 5 in mass ratio.
3. the crystalline substance of a kind of cotton/linen blend yarn according to claim 1 becomes method of modifying, it is characterized in that, described crystalline substance becomes the microcosmic lattice of modification cotton/linen blend yarn compared with the microcosmic lattice of described cotton/linen blend yarn, and hole increases 11% ~ 16%, and degree of crystallinity reduces 12 ~ 19%; Described crystalline substance becomes modification cotton/linen blend yarn compared with described cotton/linen blend yarn, and dye-uptake improves 20% ~ 35%, and COLOR FASTNESS improves 17% ~ 21%.
4. the crystalline substance of a kind of cotton/linen blend yarn according to claim 1 becomes method of modifying, it is characterized in that, described boosting is linear boosting, and rate of pressure rise k meets relational expression
wherein t is pressure rising time, k
0for initial boost speed; k
0within the scope of 0.5MPa/min ~ 1MPa/min.
5. the crystalline substance of a kind of cotton/linen blend yarn according to claim 1 becomes method of modifying, it is characterized in that, described removal modification medium is the modification medium adopting heating and vacuumize in parallel method of evaporating removal cotton/linen blend yarn.
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| CN201310318142.8A CN103422280B (en) | 2013-07-26 | 2013-07-26 | The crystalline substance of a kind of cotton/linen blend yarn becomes method of modifying |
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Inventor after: Sun Yize Inventor after: Meng Chuo Inventor after: Ji Chengchang Inventor after: Huang Shuang Inventor after: Sun Zhijun Inventor before: Sun Yize Inventor before: Meng Chuo Inventor before: Huang Shuang Inventor before: Sun Zhijun |
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