CN109023538B - Short-process zero-discharge water production method for refined industrial hemp - Google Patents
Short-process zero-discharge water production method for refined industrial hemp Download PDFInfo
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01B—MECHANICAL TREATMENT OF NATURAL FIBROUS OR FILAMENTARY MATERIAL TO OBTAIN FIBRES OF FILAMENTS, e.g. FOR SPINNING
- D01B1/00—Mechanical separation of fibres from plant material, e.g. seeds, leaves, stalks
- D01B1/10—Separating vegetable fibres from stalks or leaves
- D01B1/14—Breaking or scutching, e.g. of flax; Decorticating
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01C—CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES
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Abstract
The invention relates to a short-process zero-discharge water production method of refined industrial hemp, wherein the hemp is beaten into hemp, and the hemp is directly subjected to continuous-tank one-bath degumming, bleaching and softening processing without discharging water after the processing of drafting, impurity removal and carding of a jute back-end machine and a combined carding machine; degumming and bleaching in one bath, wherein the bath ratio is 1: 5-20 ℃, wherein the bleaching temperature in the high-temperature high-pressure bleaching cylinder is 98-135 ℃, and the bleaching heat preservation time is 5-60 minutes; degumming and bleaching for 2-3 times in one bath, drying after degumming and bleaching, softening in a continuous cylinder without draining, and drying in microwave or low-temperature to obtain the finished product. The whiteness of refined industrial hemp is more than 60%, the splitting degree of the industrial hemp raw materials with the branch of less than 36 cm after being processed is more than 1500, and the splitting degree of the industrial hemp raw materials with the branch of more than 36 cm after being processed is more than 2000. Can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like to prepare blended yarns containing hemp.
Description
Technical Field
The invention relates to the field of textiles, in particular to a short-process zero-drainage production method for refining industrial hemp.
Background
The industrial hemp can improve soil, the growing period of the fiber planted by the industrial hemp is short, the fiber can be planted by replacing part of cotton, and chemical fertilizer and pesticide are saved. The industrial hemp for fiber is harvested at proper time and left in the ground for natural degumming processing by rain and dew, the industrial hemp is beaten into hemp secondary crude fiber after degumming by rain and dew, and the fallen substance in the process of beating the hemp secondary crude fiber becomes the hemp secondary crude fiber, and the hemp beating secondary crude fiber hemp becomes the raw material of the subsequent textile mill. The quality of the hemp made by the hemp is obviously better than that of secondary coarse fiber, and the hemp can be used as a high-grade raw material. The pectin and lignin content of the hemp made from industrial hemp produced by a rain and dew method is higher, so that the subsequent degumming and bleaching sewage discharge amount is high, the COD and BOD indexes of the sewage are high, and the sewage treatment burden is increased. The conventional biological, chemical degumming and bleached industrial hemp is also a bundle fiber, and can be used for subsequent blending processing after being subjected to curing, opening and carding again to be in an approximate single fiber state with high splitting degree. The degummed and bleached industrial hemp bundle-shaped fiber is subjected to subsequent opening and carding to increase short fibers and reduce the yield. The degumming, the opening after bleaching and the processing after carding also improve the cost of manpower, energy and the like, particularly, the health preserving processing is needed before the opening and the carding, the humidifying and health preserving time in summer is 2-3 days generally, the humidifying and health preserving time in winter is 7-10 days, and the production efficiency is very low.
Disclosure of Invention
The invention aims to provide a short-process zero-drainage production method for refining industrial hemp, which is a clean and environment-friendly production method for completely chlorine-free bleaching processing, has short production process, can process bundle-shaped industrial hemp bast thread fibers into an approximate single-fiber state with high splitting degree through degumming and bleaching, can avoid subsequent processes of curing, opening and carding, and can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like to prepare natural color, bleached and colored spun yarns. The method has the advantages of high yield, low cost and short production time, and simultaneously, the whole production process does not discharge water, thereby being an efficient ecological environment-friendly production mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
the short-process zero-discharge water production method of refined industrial hemp comprises the following specific steps:
1) the adopted raw material is the raw material for subsequent degumming and bleaching processing after the beaten hemp is drafted, decontaminated and carded by a jute back-end machine and a combined carding machine; or mechanical short ramie combed off in the hackling machine production process is used, and the mechanical short ramie is subjected to impurity removal processing by a jute back-end machine to become a raw material for subsequent degumming and bleaching processing;
2) degumming and bleaching in one bath, wherein the bath ratio is 1: 5-20 ℃, wherein the bleaching temperature in the high-temperature high-pressure bleaching cylinder is 98-135 ℃, and the bleaching heat preservation time is 5-60 minutes; degumming and bleaching for 2-3 times in one bath without draining water each time, degumming and bleaching in one bath in a continuous cylinder, drying after degumming and bleaching, softening in a continuous cylinder without draining water, and drying in microwave or low-temperature after softening to obtain the finished product.
In the step 2), 0.5-3 g/l of bleaching accelerant MDC, 2-6 g/l of fiber protective agent MBS and 25-35 g/l of 27% hydrogen peroxide are added for head-tank one-bath degumming and bleaching; the second and third cylinder are degummed in one bath, bleaching is carried out, 0.5-3 g/L of bleaching accelerant MDC, 2-5 g/L of fiber protective agent PN, 2-6 g/L of fiber protective agent MBS and 15-30 g/L of 27% hydrogen peroxide are added.
Softening in the step 2), wherein the bath ratio is 1: 5-20, adding 5-15 g/L of softening agent MQS, processing for 15-30 minutes at 50-75 ℃, wherein the low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
Degumming and bleaching in the step 2) for 2-3 times in one bath: degumming and bleaching the industrial hemp raw material with the volume of more than 36 metric counts in one bath for 2 times; the industrial hemp raw material with less than 36 metric counts is degummed and bleached for 3 times in one bath.
The continuous-cylinder one-bath degumming and bleaching in the step 2) are to discharge the residual liquid after each degumming and bleaching processing to an auxiliary cylinder for storage, and store the residual liquid and the water discharged by the centrifugal dehydrator in the same auxiliary cylinder as the supplementary inlet water for next processing of industrial hemp fibers with the same process; when the cylinder is continuously produced, 0.5-2.5 g/L of bleaching accelerant MDC, 0-5 g/L of fiber protective agent PN, 2-6 g/L of fiber protective agent MBS and 15-35 g/L of 27% hydrogen peroxide are supplemented.
The continuous cylinder softening processing in the step 2) is to discharge the residual liquid after each softening processing to an auxiliary cylinder for storage, store the residual liquid and the water discharged by the centrifugal dehydrator in the same auxiliary cylinder, use the residual liquid as the supplementary feed water for the next industrial hemp fiber processing with the same process, and supplement softener MQS5-15 g/l during continuous cylinder production.
Compared with the prior art, the invention has the beneficial effects that:
the short-flow zero-discharge production method of refined industrial hemp is a clean and environment-friendly production method with completely chlorine-free bleaching processing, and the whole production and processing process does not use caustic soda, sodium chlorite, sodium hypochlorite and other conventional aids, and is a continuous cylinder processing and non-discharge production mode which is environment-friendly. The industrial hemp fiber in a high-splitting degree state can be obtained through efficient degumming and bleaching, the subsequent processing procedures of health preservation, opening, carding and the like are omitted, energy and labor are saved, and the yield is greatly improved.
The whiteness of refined industrial hemp processed by the method is more than 60%, the splitting degree of industrial hemp raw materials with the branch of less than 36 cm after processing is more than 1500, and the splitting degree of industrial hemp raw materials with the branch of more than 36 cm after processing is more than 2000. The finished product after processing can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like on cotton spinning equipment to prepare blended yarns containing hemp.
Detailed Description
The present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to the examples described below.
The short-process zero-discharge water production method of refined industrial hemp comprises the following specific steps:
1) the adopted raw material is the raw material for subsequent degumming and bleaching processing after the beaten hemp is drafted, decontaminated and carded by a jute back-end machine and a combined carding machine; or mechanical short ramie combed off in the hackling machine production process is used, and the mechanical short ramie is subjected to impurity removal processing by a jute back-end machine to become a raw material for subsequent degumming and bleaching processing;
2) degumming and bleaching in one bath, wherein the bath ratio (mass ratio of fiber to water) is 1: 5-20 ℃, wherein the bleaching temperature in the high-temperature high-pressure bleaching cylinder is 98-135 ℃, and the bleaching heat preservation time is 5-60 minutes; degumming and bleaching for 2-3 times in one bath without draining water each time, degumming and bleaching in one bath in a continuous cylinder, drying after degumming and bleaching, softening in a continuous cylinder without draining water, and drying in microwave or low-temperature after softening to obtain the finished product.
In the step 2), 0.5-3 g/l of bleaching accelerant MDC, 2-6 g/l of fiber protective agent MBS and 25-35 g/l of 27% hydrogen peroxide are added for head-tank one-bath degumming and bleaching; the second and third cylinder are degummed in one bath, bleaching is carried out, 0.5-3 g/L of bleaching accelerant MDC, 2-5 g/L of fiber protective agent PN, 2-6 g/L of fiber protective agent MBS and 15-30 g/L of 27% hydrogen peroxide are added.
Softening in the step 2), wherein the bath ratio (mass ratio of fiber to water) is 1: 5-20, adding a softening agent MQS5-15 g/L, processing at 50-75 ℃ for 15-30 minutes, wherein the low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
Degumming and bleaching in the step 2) for 2-3 times in one bath: degumming and bleaching the industrial hemp raw material with the volume of more than 36 metric counts in one bath for 2 times; the industrial hemp raw material with less than 36 metric counts is degummed and bleached for 3 times in one bath.
The continuous-cylinder one-bath degumming and bleaching in the step 2) are to discharge the residual liquid after each degumming and bleaching processing to an auxiliary cylinder for storage, and store the residual liquid and the water discharged by the centrifugal dehydrator in the same auxiliary cylinder as the supplementary inlet water for next processing of industrial hemp fibers with the same process; when the cylinder is continuously produced, 0.5-2.5 g/L of bleaching accelerant MDC, 0-5 g/L of fiber protective agent PN, 2-6 g/L of fiber protective agent MBS and 15-35 g/L of 27% hydrogen peroxide are supplemented.
The continuous cylinder softening processing in the step 2) is to discharge the residual liquid after each softening processing to an auxiliary cylinder for storage, store the residual liquid and the water discharged by the centrifugal dehydrator in the same auxiliary cylinder, use the residual liquid as the supplementary feed water for the next industrial hemp fiber processing with the same process, and supplement softener MQS5-15 g/l during continuous cylinder production.
The first embodiment is as follows:
selecting industrial hemp with more than 36 metric counts, beating into hemp, and performing drafting, impurity removal and carding processing on the hemp through a jute back-end machine and a combined carding machine to obtain a raw material for subsequent degumming and bleaching processing.
1) Beating industrial hemp with the volume of more than 36 metric counts processed by a jute back-end machine and a comber into hemp, directly putting the hemp into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (the mass ratio of fiber to water) is 1: 12, adding 1.5 g/l bleaching promoter MDC, running for 5 minutes, and then adding 6 g/l fiber protective agent MBS and 35 g/l hydrogen peroxide with 27% concentration according to the sequence. Heating to 135 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 5 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching residual liquid to an auxiliary vat. And then the fiber cake after the first cylinder is degummed and bleached in the same bath is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. And reserving the fiber as the next new fiber head tank for one-bath degumming and bleaching.
2) And (3) putting the centrifugally dewatered head-tank fiber into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 12, adding 1.5 g/l bleaching promoter MDC, running for 5 minutes, then adding 5 g/l fiber protective agent PN, 6 g/l fiber protective agent MBS and 30 g/l hydrogen peroxide with 27% concentration (two-cylinder bleaching). Heating to 130 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 20 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching residue to the auxiliary cylinder. And then the fiber cake after the secondary one-bath degumming and bleaching is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. The new fiber is reserved for the second one-bath degumming and bleaching of the next new fiber.
3) And (3) putting the centrifuged and dehydrated second-time head tank fiber into a stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 12, adding 12 g/L of softening agent MQS, processing for 25 minutes at 70 ℃. And then the softened fiber cake is lifted to a centrifugal dehydrator for dehydration, and water discharged by the centrifugal dehydrator is collected and reinjected to a softening and bleaching secondary cylinder. And the mixture is reserved for the next softening processing.
4) And after softening processing, the product is dried by microwave or low temperature to obtain the finished product. The low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
5) The industrial hemp processed by the method has a split degree of more than 2000 and whiteness of more than 65 percent, wherein the split degree is more than 36 metric counts. The finished product after processing can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like on cotton spinning equipment to prepare blended yarns containing hemp.
Example two:
selecting industrial hemp with more than 36 metric counts, beating into hemp, and performing drafting, impurity removal and carding processing on the hemp through a jute back-end machine and a combined carding machine to obtain a raw material for subsequent degumming and bleaching processing.
1) Beating industrial hemp with the volume of more than 36 metric counts processed by a jute back-end machine and a comber into hemp, directly putting the hemp into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (the mass ratio of fiber to water) is 1: 13, adding the storage liquid of the first cylinder of the previous batch for one-bath degumming and bleaching, supplementing clear water when the water quantity is insufficient, adding 1.2 g/l of bleaching accelerant MDC in sequence, running for 5 minutes, and then adding 6 g/l of fiber protective agent MBS and 25 g/l of 27% hydrogen peroxide. Heating to 135 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 6 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching residue to the auxiliary cylinder. And then the fiber cake after the first cylinder is degummed and bleached in the same bath is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. And reserving the fiber as the next new fiber head tank for one-bath degumming and bleaching.
2) And (3) putting the centrifugally dewatered head-tank fiber into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 15, adding the storage liquid for the second one-bath degumming and bleaching of the previous batch, supplementing clear water when the water quantity is insufficient, adding 1.5 g/l of bleaching accelerant MDC in sequence, running for 5 minutes, then adding 4 g/l of fiber protective agent PN, 6 g/l of fiber protective agent MBS and 25 g/l of 27% hydrogen peroxide. Heating to 130 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 25 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching residual liquid to an auxiliary cylinder. And then the fiber cake after the secondary one-bath degumming and bleaching is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. The new fiber is reserved for the second one-bath degumming and bleaching of the next new fiber.
3) And (3) putting the centrifuged and dehydrated second-time head tank fiber into a stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 13, adding the storage liquid softened and processed in the previous batch, supplementing clear water when the water amount is insufficient, adding 11 g/L of softening agent MQS, and processing for 25 minutes at the temperature of 70 ℃. And then the softened fiber cake is lifted to a centrifugal dehydrator for dehydration, and water discharged by the centrifugal dehydrator is collected and reinjected to a softening and bleaching secondary cylinder. And the mixture is reserved for the next softening processing.
4) And after softening processing, the product is dried by microwave or low temperature to obtain the finished product. The low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
5) The splitting degree of the industrial hemp with the weight of more than 36 metric branches processed by the method is more than 2000, and the whiteness is higher than 65%. The finished product after processing can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like on cotton spinning equipment to prepare blended yarns containing hemp.
Example three:
selecting 32 metric industrial hemp, beating into hemp, and processing by drafting, impurity removing and carding through a jute back-end spinning machine and a combined carding machine to obtain the raw material for subsequent degumming and bleaching.
1) Beating 32 metric industrial hemp processed by a jute back-end machine and a comber into hemp, and directly putting the hemp into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (the mass ratio of fiber to water) is 1: 15, adding 2.5 g/l bleaching promoter MDC, running for 5 minutes, and then adding 6 g/l fiber protective agent MBS and 35 g/l hydrogen peroxide with 27% concentration according to the sequence. Heating to 135 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 7 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching liquid to an auxiliary cylinder. And then the fiber cake after the first cylinder is degummed and bleached in the same bath is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. And reserving the fiber as the next new fiber head tank for one-bath degumming and bleaching.
2) And (3) putting the centrifugally dewatered head-tank fiber into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 12, adding 2 g/l of bleaching promoter MDC, operating for 5 minutes, and then adding 6 g/l of fiber protective agent MBS, 30 g/l of hydrogen peroxide with 27% concentration and 3 g/l of fiber protective agent PN in sequence. Heating to 132 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 10 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching liquid to an auxiliary cylinder. And then the fiber cake after the secondary one-bath degumming and bleaching is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. The new fiber is reserved for the second one-bath degumming and bleaching of the next new fiber.
3) And (3) putting the centrifugally dewatered head-tank fiber into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 12, adding 1 g/l bleaching promoter MDC, running for 5 minutes, then adding 5 g/l fiber protective agent PN, 6 g/l fiber protective agent MBS and 15 g/l hydrogen peroxide with 27% concentration according to the sequence. Heating to 130 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 20 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching liquid to an auxiliary cylinder. And hoisting the fiber cake after the third one-bath degumming and bleaching to a centrifugal dehydrator for dehydrating, collecting water discharged by the centrifugal dehydrator, and reinjecting the collected water to a bleaching auxiliary cylinder. The new fiber is reserved for the third one-bath degumming and bleaching of the next new fiber.
4) And (3) putting the centrifuged and dehydrated third-time primary tank fiber into a stainless steel bleaching tank at a bath ratio (mass ratio of fiber to water) of 1: 12, adding 15 g/L of softening agent MQS, controlling the temperature at 75 ℃, and processing for 25 minutes. And then the softened fiber cake is lifted to a centrifugal dehydrator for dehydration, and water discharged by the centrifugal dehydrator is collected and reinjected to a softening and bleaching secondary cylinder. And the mixture is reserved for the next softening processing.
5) And after softening processing, the product is dried by microwave or low temperature to obtain the finished product. The low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
6) The industrial hemp fiber processed by the method has the advantages that the splitting degree is more than 1500, and the whiteness is higher than 60%. The finished product after processing can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like on cotton spinning equipment to prepare blended yarns containing hemp.
Example four:
selecting 32 metric industrial hemp, beating into hemp, and processing by drafting, impurity removing and carding through a jute back-end spinning machine and a combined carding machine to obtain the raw material for subsequent degumming and bleaching.
1) Beating 32 metric industrial hemp processed by a jute back-end machine and a comber into hemp, and directly putting the hemp into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (the mass ratio of fiber to water) is 1: 15, adding the storage liquid of the first cylinder of the previous batch for one-bath degumming and bleaching, supplementing clear water when the water quantity is insufficient, adding 2 g/L bleaching accelerant MDC according to the sequence, operating for 5 minutes, and then adding 6 g/L fiber protective agent MBS and 35 g/L hydrogen peroxide with 27% concentration. Heating to 135 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 10 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching liquid to an auxiliary cylinder. And then the fiber cake after the first cylinder is degummed and bleached in the same bath is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. And reserving the fiber as the next new fiber head tank for one-bath degumming and bleaching.
2) And (3) putting the centrifugally dewatered head-tank fiber into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 13, adding the storage liquid of the second one-bath degumming and bleaching of the previous batch, supplementing clear water when the water quantity is insufficient, adding 0.8 g/L bleaching promoter MDC for 5 minutes according to the sequence, and then adding 6 g/L fiber protective agent MBS and 25 g/L hydrogen peroxide with 27% concentration. Heating to 132 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 12 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching liquid to an auxiliary cylinder. And then the fiber cake after the secondary one-bath degumming and bleaching is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. The new fiber is reserved for the second one-bath degumming and bleaching of the next new fiber.
3) And (3) putting the centrifugally dewatered head-tank fiber into a high-temperature high-pressure stainless steel bleaching tank, wherein the bath ratio (mass ratio of the fiber to water) is 1: 15, adding the storage liquid for the third one-bath degumming and bleaching of the previous batch, supplementing clear water when the water quantity is insufficient, adding 1 g/L bleaching promoter MDC and 5 min after running, and then adding 5 g/L fiber protective agent PN, 6 g/L fiber protective agent MBS and 20 g/L hydrogen peroxide with 27% concentration. Heating to 130 ℃ at a heating rate of 1-3 ℃ per minute, preserving heat for 20 minutes, then directly relieving pressure at high temperature, discharging liquid, and discharging the processed bleaching liquid to an auxiliary cylinder. And then the fiber cake after the third one-bath degumming and bleaching is lifted to a centrifugal dehydrator for dehydration, and the water discharged by the centrifugal dehydrator is collected and reinjected to a bleaching auxiliary cylinder. The new fiber is reserved for the third one-bath degumming and bleaching of the next new fiber.
4) And (3) putting the centrifuged and dehydrated third-time primary tank fiber into a stainless steel bleaching tank at a bath ratio (mass ratio of fiber to water) of 1: 15, adding the storage liquid softened and processed in the previous batch, supplementing clear water when the water amount is insufficient, adding 15 g/L of softening agent MQS, processing at 75 ℃ for 25 minutes. And then the softened fiber cake is lifted to a centrifugal dehydrator for dehydration, and water discharged by the centrifugal dehydrator is collected and reinjected to a softening and bleaching secondary cylinder. And the mixture is reserved for the next softening processing.
5) And after softening processing, the product is dried by microwave or low temperature to obtain the finished product. The low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
6) The 32 metric industrial hemp fiber processed by the method has the advantages that the splitting degree is more than 1500, and the whiteness is higher than 60%. The finished product after processing can be directly used for blending with fibers such as cotton, tencel, modal, viscose, wool and the like on cotton spinning equipment to prepare blended yarns containing hemp.
Claims (5)
1. The short-process zero-discharge water production method of the refined industrial hemp is characterized by comprising the following specific steps of:
1) the adopted raw material is the raw material for subsequent degumming and bleaching processing after the beaten hemp is drafted, decontaminated and carded by a jute back-end machine and a combined carding machine; or mechanical short ramie combed off in the hackling machine production process is used, and the mechanical short ramie is subjected to impurity removal processing by a jute back-end machine to become a raw material for subsequent degumming and bleaching processing;
2) degumming and bleaching in one bath, wherein the bath ratio is 1: 5-20 ℃, wherein the bleaching temperature in the high-temperature high-pressure bleaching cylinder is 98-135 ℃, and the bleaching heat preservation time is 5-60 minutes; degumming and bleaching for 2-3 times in one bath, wherein water is not drained each time, degumming and bleaching in one bath in a continuous cylinder, drying after degumming and bleaching, softening in a continuous cylinder without draining, and drying at low temperature after softening to obtain a finished product;
in the step 2), 0.5-3 g/l of bleaching accelerant MDC, 2-6 g/l of fiber protective agent MBS and 25-35 g/l of 27% hydrogen peroxide are added for head-tank one-bath degumming and bleaching; the second and third cylinder are degummed in one bath, bleaching is carried out, 0.5-3 g/L of bleaching accelerant MDC, 2-5 g/L of fiber protective agent PN, 2-6 g/L of fiber protective agent MBS and 15-30 g/L of 27% hydrogen peroxide are added.
2. The method of claim 1, wherein the softening process in step 2) is performed at a bath ratio of 1: 5-20, adding 5-15 g/L of softening agent MQS, processing for 15-30 minutes at 50-75 ℃, wherein the low-temperature drying refers to the low-temperature drying temperature of not higher than 75 ℃.
3. The short-process zero-discharge water production method for refined industrial hemp according to claim 1, wherein the degumming and bleaching in the step 2) are processed in one bath for 2-3 times: degumming and bleaching the industrial hemp raw material with the volume of more than 36 metric counts in one bath for 2 times; the industrial hemp raw material with less than 36 metric counts is degummed and bleached for 3 times in one bath.
4. The short-process zero-discharge water production method for refining industrial hemp according to claim 1, wherein the continuous-tank one-bath degumming and bleaching in step 2) is performed by discharging the residual liquid after each degumming and bleaching process is completed to a secondary tank for storage, and storing the residual liquid and the water discharged by the centrifugal dehydrator in the same secondary tank as the additional inlet water for the next same-process industrial hemp fiber processing; when the cylinder is continuously produced, 0.5-2.5 g/L of bleaching accelerant MDC, 0-5 g/L of fiber protective agent PN, 2-6 g/L of fiber protective agent MBS and 15-35 g/L of 27% hydrogen peroxide are supplemented.
5. The method of claim 1, wherein the continuous cylinder softening process of step 2) comprises discharging the residual liquid after each softening process to the sub-cylinder for storage, storing the residual liquid in the same sub-cylinder together with the water discharged from the centrifugal dehydrator for use as the supplementary feed water for the next industrial hemp fiber processing, and supplying 5-15 g/l of softening agent MQS during continuous cylinder production.
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| CN101016655A (en) * | 2007-02-15 | 2007-08-15 | 东华大学 | Method of preparing textile fabric by degumming environment-friendly type crude hemp |
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| CN1924120A (en) * | 2006-09-11 | 2007-03-07 | 东华大学 | Method of preparing fiber for weave by peroxide degumming method |
| CN101016655A (en) * | 2007-02-15 | 2007-08-15 | 东华大学 | Method of preparing textile fabric by degumming environment-friendly type crude hemp |
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