CN104178819B - The freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers - Google Patents
The freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers Download PDFInfo
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- CN104178819B CN104178819B CN201410354750.9A CN201410354750A CN104178819B CN 104178819 B CN104178819 B CN 104178819B CN 201410354750 A CN201410354750 A CN 201410354750A CN 104178819 B CN104178819 B CN 104178819B
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- 239000000835 fiber Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 68
- 239000011487 hemp Substances 0.000 title claims abstract description 37
- 238000007710 freezing Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 230000035939 shock Effects 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 26
- MHAJPDPJQMAIIY-UHFFFAOYSA-N hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 22
- 239000000654 additive Substances 0.000 claims description 13
- 230000000996 additive Effects 0.000 claims description 13
- 238000010306 acid treatment Methods 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N Sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L Sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L mgso4 Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N Sodium sulfide Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 2
- 238000010411 cooking Methods 0.000 claims description 2
- 239000003995 emulsifying agent Substances 0.000 claims description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 2
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910001948 sodium oxide Inorganic materials 0.000 claims 1
- 238000003756 stirring Methods 0.000 claims 1
- 229920005610 lignin Polymers 0.000 abstract description 20
- 229920000591 gum Polymers 0.000 abstract description 18
- 239000000126 substance Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- 238000009987 spinning Methods 0.000 abstract description 7
- 238000002604 ultrasonography Methods 0.000 abstract description 6
- 238000005554 pickling Methods 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 238000010297 mechanical methods and process Methods 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000007730 finishing process Methods 0.000 abstract 1
- 241000218236 Cannabis Species 0.000 description 32
- 240000008564 Boehmeria nivea Species 0.000 description 13
- 238000010998 test method Methods 0.000 description 11
- 240000000218 Cannabis sativa Species 0.000 description 8
- 235000009120 camo Nutrition 0.000 description 8
- 235000005607 chanvre indien Nutrition 0.000 description 8
- 239000000084 colloidal system Substances 0.000 description 8
- 235000012765 hemp Nutrition 0.000 description 8
- 235000012766 marijuana Nutrition 0.000 description 8
- 229920002488 Hemicellulose Polymers 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 239000003513 alkali Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000002255 enzymatic Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910014033 C-OH Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000037250 Clearance Effects 0.000 description 1
- 229910014570 C—OH Inorganic materials 0.000 description 1
- 240000006240 Linum usitatissimum Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 210000003205 Muscles Anatomy 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N Sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000001580 bacterial Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 230000035512 clearance Effects 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 230000000813 microbial Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 230000000576 supplementary Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229920001221 xylan Polymers 0.000 description 1
- 150000004823 xylans Chemical class 0.000 description 1
- AEMOLEFTQBMNLQ-BKBMJHBISA-N α-D-galacturonic acid Chemical compound O[C@H]1O[C@H](C(O)=O)[C@H](O)[C@H](O)[C@H]1O AEMOLEFTQBMNLQ-BKBMJHBISA-N 0.000 description 1
Abstract
The freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers, its described degumming tech is after ultrasound wave decocting in water, pre-pickling, carries out UV-radiation, freezing shock heating, lignoenzyme process, enters High Temperature High Pressure degumming process the most again.China-hemp fibers surface degumming effect after this PROCESS FOR TREATMENT is better than chemical method and Mechanical Method degumming, residual gum content and content of lignin are relatively low, meet spinning post-finishing process requirements, while obtaining good whiteness and flexibility, also controlling within can spinning requirement by the ultimate strength of fiber, length and the fineness of fiber have also been obtained improvement, wearability is greatly improved, chemical treatment regimens consumption reduces, and pollutant effluents discharge is less, is the process of a kind of environmental protection.
Description
Technical field
The present invention relates to a kind of degumming process technique for Fructus Cannabis (i.e. Fructus Cannabis) raw ramie fiber, particularly in High Temperature High Pressure
On the basis of method for degumming, it is aided with freezing shock heating and lignoenzyme process a kind of china-hemp fibers freezing shock heating lignoenzyme auxiliary de-
Adhesive process.
Background technology
The Degumming method of existing Fructus Cannabis (i.e. Fructus Cannabis) fiber has a variety of, such as: traditional pond Process of retting flax with, chemical Degumming
Method, bacterial degumming method, enzymatic degumming, the quick-fried method of sudden strain of a muscle, alkali oxygen method, ultrasound wave method for degumming and mechanical-chemical method for degumming etc..
In Publication No. CN1851062, the patent of invention of entitled " a kind of hemp degumming process ", use normal temperature and pressure
The method combined with High Temperature High Pressure carries out degumming process to china-hemp fibers, compares general degumming tech and saves the time more than 1.5
Hour, alkali concn is substantially reduced, after process in fiber crops content of lignin less than 0.5%, the basic free of losses of strength of fiber, degummed ramie
Pure white loose, quality is good.But the chemical reagent added in the present invention is relatively big, and alkali consumption is up to 5%, about 50g/L, although time
Between saved, but pollution on the environment is more serious.
In Publication No. CN100355951C, the invention of entitled " a kind of high temperature-microbe combined hemp degumming method "
In patent, first Fructus Cannabis washing is carried out high temperature degumming kiering process, after the Fructus Cannabis after high temperature degumming put in enzymatic vessel carry out
Microbial treatments, the Fructus Cannabis obtained is pure white loose, not only soft quality but also good, and environment is not almost had by the high temperature low alkali technology of employing
There is pollution.But enzymolysis time of the present invention is long, and the residual gum content of not mentioned Fructus Cannabis and content of lignin, it is understood that there may be cull
Rate and the highest problem of content of lignin.
In Publication No. CN101275289B, the patent of invention of entitled " the frozen-irradiated irradiation degummed technique of china-hemp fibers "
In, after hot bath, pre-pickling, NaClO pretreatment, carry out UV-radiation, quenching, heat treated, carry out alkali oxygen-machinery connection the most again
Close degumming process, be eventually adding softening agent and carried out secondary kiering.China-hemp fibers surface degumming effect after this PROCESS FOR TREATMENT
Being better than conventional alkaline oxygen method and Mechanical Method degumming, reached the requirement of national Grade A, content of lignin meets spinning post-finishing work
Skill demand, while obtaining good whiteness and flexibility, also controls the ultimate strength of fiber and percentage elongation to want can spin
Within asking, the length of fiber and fineness have also been obtained improvement, and wearability is greatly improved.But the present invention carries out twice kiering,
NaOH and H used by kiering2O2Total amount is 24g/L, and chemical levels is high, and environmental pollution is serious.
The above-mentioned existing degumming tech to china-hemp fibers is high for there is gum level in china-hemp fibers, it is difficult to removal
Problem is studied, and all achieves certain effect in terms of Fructus Cannabis degumming tech.But above-mentioned degumming tech is typically chosen
The most single degumming mode, does not consider with reducing both chemical levels reducing residual gum content, and is adopting
Do not take narrow spectrum measure for content of lignin height with after a soda boiling, to such an extent as to have residual gum content height, lignin to contain
The shortcoming that amount is high or chemical levels is big.And reduce cost, reduce the practical problem that environmental pollution is also urgent need solution.
Summary of the invention
It is an object of the invention to provide the freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers, existing to solve
In Fructus Cannabis degumming technique, there is residual gum content higher, lignin removal effect is undesirable, whiteness and flexibility is relatively low, change
Learn the problems such as reagent dosage is big, environmental pollution is serious.
The technical scheme realizing above-mentioned purpose and solution the problems referred to above is as follows.
The freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers, is characterized in that after preimpregnation acid treatment, by fibre
Dimension and the bath raio of solution are 1:40, soak 25 grams of fibers in every liter of solution, carry out following steps:
(1) UV radiation treatment: the fiber after preimpregnation acid treatment is washed till PH=7, puts into hydrogen peroxide and the 4-8g/L of 4-8g/L
The mixed solution of sodium hydroxide, add boiling-off additive and be placed under the ultraviolet light of 280-350nm and radiate 20-40 minute；
(2) freezing shock heating process: the fiber after being radiated by UV is washed till PH=7, puts into pallet, freezing 20-40 minute, freezing
Temperature is-15--55 DEG C, takes out immediately after and is placed in the constant temperature boiling water of 100 DEG C 20-40 minute；
(3) lignoenzyme processes: the fiber after freezing-shock heating is washed till PH=7, dries, put into the wooden of PH=4.5-5.5
In element enzymatic solution, react 1-3 hour in 40-50 DEG C of water bath with thermostatic control；
(4) high temperature high pressure process: by lignoenzyme process after fiber be washed till PH=7, put into 4-12g/L hydrogen peroxide and
The mixed solution of the sodium hydroxide of 4-12g/L, adds boiling-off additive and is positioned in pressure cooker, and pressure is 0.1-0.15MPa, the time
20-30min。
Further supplementary technology scheme is as follows.
Described cooking additive is by waterglass sodium silicate 0.2g/L, sodium sulfide 2g/L, sodium tripolyphosphate 2g/L, sodium sulfite
0.8g/L and magnesium sulfate 2 g/L, stirs acquisition.
The constant temperature boiling water that described freezing is shock heating is the solution after VU-radiation.
Composition and the content thereof of described lignoenzyme solution is: liquid lignoenzyme 4-12g/L, is adjusted by solution with emulsifying agent
To PH=4.5-5.5.
The technology of the present invention freezing shock heating lignoenzyme auxiliary degumming process of above-mentioned provided a kind of china-hemp fibers is provided
Scheme, its main process characteristic is as follows.
(1) at the pretreatment stage of china-hemp fibers, use ultrasound wave decocting in water, pre-pickling processes, the most not only make fiber pine
Dissipate, remove part water-solubility impurity, beneficially degumming, and make fiber obtain abundant swollen, it is most important that overcome simple heat
Water bath processing makes fine impurity be difficult to the shortcoming removed.
(2) fiber after pre-pickling adds sodium hydroxide, hydrogen peroxide and boiling-off additive, and is placed on spoke under intensive ultraviolet
Penetrate so that it is fiber surface gelatinous layer is etched and destroys, increase and expanded crack, and aoxidize major part cellulose and part
Lignin, makes fibre whiteness increase, and lignin is more soluble to come off.
(3) fiber after being radiated by UV-is put into anxious freezing in case and is quenched, and then takes out to put in constant temperature boiling water and adds pyrolysis
Freezing, during this, there is drastically contraction in various degree and expansion in fiber and colloid matrix simultaneously, cause it to be subject to longitudinally and
Horizontal positive and negative drawing power effect, makes colloid destroy further and even comes off.
(4) china-hemp fibers after freezing shock heating process carries out lignoenzyme process, utilizes the specific aim of lignoenzyme to reduce
Content of lignin.
(5) fiber after processing lignoenzyme carries out high temperature high pressure process, utilizes steam to impact fiber, promotes fiber
The disengaging of colloid and separation, make fiber bunchy.
The Fructus Cannabis processed through present invention process method is compared with the Fructus Cannabis that prior art processes, and the present invention is de-in High Temperature High Pressure
On the basis of glue method, be aided with UV-radiation further, freezing is shock heating, then for higher the lacking of freezing shock heating rear content of lignin
Point, have employed again lignoenzyme and processes, by NaOH and H2O2Total consumption is reduced to 14g/L, and relatively other degumming tech chemical reagent are used
Amount is a half or more than half, and content of lignin be 0.71%, residual gum content be 2.26%, also residual than other degumming tech
Glue rate much lower, not only solves that to there is residual gum content in existing Fructus Cannabis degumming technique higher, lignin removal effect
The problem such as undesirable and chemical levels is high, serious environment pollution, and the Fructus Cannabis after processing has reached national Grade A
Requirement, meet the demand of spinning post-finishing technique.Simultaneously while the present invention obtains good whiteness and flexibility, also will
The ultimate strength of fiber and percentage elongation control within can spinning requirement；The most what time its concrete beneficial effect also has.
(1) the china-hemp fibers smooth surface after this PROCESS FOR TREATMENT, does not has remaining colloid substantially, such as accompanying drawing 1 and accompanying drawing 2 institute
Show.
(2) infared spectrum before and after degumming shows that this technique is more thorough to the removal of lignin, hemicellulose and pectic substance
The end, especially the highest to the clearance of lignin, its characteristic peak disappears substantially；See accompanying drawing 3 and accompanying drawing 4.
(3) before and after degumming, the property indices of china-hemp fibers compares such as table 1.
Table 1
| Project | Fructus Cannabis raw ramie | Freezing shock heating | High Temperature High Pressure |
| Cellulose (%) | 50.34 | 80.63 | 97.74 |
| Lignin (%) | 14.23 | 1.27 | 0.71 |
| Residual gum content (%) | 43.12 | 19.37 | 2.26 |
| Fracture strength (cN/dtex) | 6.67 | 2.71 | 1.87 |
| Whiteness | 16.3 | 45.8 | 68.5 |
| Average diameter (μm) | 17.83 | 14.28 | 12.36 |
| Average length (mm) | 22.97 | 19.3 | 17.88 |
From table 1 it follows that after using this technique degumming, 1. lignin and residual gum content have had obvious reduction, especially
To be lignin shock heating in freezing and is reduced to 1.27% and 0.71% after high temperature high pressure process for it, and residual gum content is reduced to
19.37% and 2.26%, compared with conventional chemical Degumming method, degumming effect is excellent is substantially, and the technique meeting spinning post-finishing needs
Ask；2. the whiteness of fiber is greatly improved, and its root, stem and the outward appearance of taper fiber and feel all become pure white smooth,
Soft fine and smooth, see accompanying drawing 5, Fig. 6, Fig. 7 and Fig. 8；Although 3. ultimate strength decreases, but still ensure that the need of spinning post-finishing
Want.
(4) this technique is to be aided with on the basis of High Temperature High Pressure degumming tech at UV-radiation, freezing shock heating and lignoenzyme again
Reason, pollutant effluents discharge is less, chemical levels is low, is a kind of new technology comparing environmental protection.
Accompanying drawing explanation
Fig. 1 is the present invention untreated Fructus Cannabis raw ramie SEM picture.
In figure: the gum level of Fructus Cannabis raw ramie is higher, cover thicker, and cover dense uniformly, and along fiber indulge
To in continuous distribution.
Fig. 2 is the Fructus Cannabis sem photomicrograph after degumming process of the present invention.
In figure: fiber surface is smooth, without remaining colloid and impurity, it can be seen that many deeper longitudinal grooves and part are micro-
Hole.
Fig. 3 be Fructus Cannabis raw ramie of the present invention with degumming process after the infared spectrum figure (locally 1) of Fructus Cannabis.
In figure: A is raw ramie, B is the Fructus Cannabis after degumming process.Wherein: 893.73cm-1Place be designated as C-amorphous and
The H bending vibration of crystalline cellulose, this peak value keeps constant, and this indicates that the fiber not affecting fiber in scouring processes
Element structure.1382.95 cm-1What place represented is aromatic ring C=C stretching vibration peak (xylan), and this is the characteristic peak of hemicellulose, place
After reason, china-hemp fibers vibration peak in this place substantially weakens, and shows the removal ratio of hemicellulose during degumming more thoroughly.1400.65
cm-1That place represents is carboxylate radical COO-Symmetrical flexible, represent adipocere matter, this peak is wholly absent explanation adipocere matter and removes completely.
1636.68 cm-1Place is C=O stretching vibration, and it is the characteristic absorption peak of lignin, and after degumming process, this peak disappears the most substantially, wood
The removal ratio of quality is more thoroughly.1741.71 cm-1For hemicellulose alditol ester group, being the characteristic peak of hemicellulose, this peak is complete
Disappear, illustrate that hemicellulose is removed completely.
Fig. 4 be Fructus Cannabis raw ramie of the present invention with degumming process after the infared spectrum figure (locally 2) of Fructus Cannabis.
In figure: 3416.58cm-1Place is the OH stretching vibration peak of saccharide C-OH, and after degumming, this peak disappears substantially, and this is described
Process the removal effect to hemicellulose clearly.
Fig. 5 is Fructus Cannabis raw ramie root of the present invention, stipe part fiber morphology figure.
In figure: fiber is parallel close-packed arrays slabbing or strip in colloid matrix, and separation property each other is poor,
Color is dark yellow, and impurity is more, and fibre plate is stronger and strong, and flexibility and crimpiness are poor.
Fig. 6 is the degumming Later Han Dynasty of the present invention Radix Cannabis, stipe part fiber morphology figure.
In figure: fiber becomes pure white exquisiteness shinny, soft, and between fiber and fiber, separation property is preferable, surface impurity and
Colloid is substantially removed, and fiber forms certain curling.
Fig. 7 is Fructus Cannabis raw ramie taper fiber morphology figure of the present invention.
In figure: fiber colour is dark yellow, there are much impurity and speckle in surface, and fibers parallel close-packed arrays becomes many elongated
Sheet strip, thickness differs, one-tenth reunion shape wrapped around one another.
Fig. 8 is the degumming Later Han Dynasty of the present invention crop end portion fiber morphology figure.
In figure: fibre whiteness is significantly improved, colloid and impurity are removed substantially, and flexibility is fine, and fiber exquisiteness is shinny,
It is separated into many tuftlets wrapped around one another agglomerating.
Detailed description of the invention
Present invention technical scheme described in foregoing invention content can the most specifically by detailed description of the invention
Bright, its described beneficial effect also is able to reach its described effect by specific embodiment.
Embodiment 1
Implement comprising the following steps that of the freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers of the present invention.
One, ultrasound wave-decocting in water processes
At ultrasonic power 350W, in the case of 70 DEG C, with deionized water, fiber concentration in the solution is 25g/L, completely
Soak fiber 100min, make it soak uniformly every suitable/counterclockwise alternate agitation of 10min.Wash several times with clear water, until its
Soak pH value is 7.
Two, preimpregnation acid treatment
At 50 DEG C, the dilute sulfuric acid using concentration to be 2.5g/L is completely soaked Gushi of Henan Fructus Cannabis raw ramie, and (fiber is at solution
In concentration be 25g/L) 90min, every 10min suitable/counterclockwise alternate agitation make it soak uniformly.Some with clear water washing
It is secondary, until its soak pH value is 7.
Three, UV-radiation treatment
Fiber after preimpregnation acid treatment is washed till PH=7, and the mixing putting into the hydrogen peroxide of 6g/L and the sodium hydroxide of 6g/L is molten
Liquid, adds boiling-off additive and is placed under the ultraviolet light of 280-350nm and radiates 20 minutes.
Four, freezing-shock heating process
Take out the china-hemp fibers after UV-radiation treatment, put in pallet, be placed in and suddenly freeze freezing 20min in-55 DEG C of case.
Taking-up is freezed rear Fructus Cannabis and is placed in 20min in the constant temperature boiling water of 100 DEG C.
Five, lignoenzyme processes
Fiber after freezing-shock heating is washed till PH=7, dries, put in the lignoenzyme solution of PH=5, at 40 DEG C of constant temperature
Water-bath is reacted 2 hours.
Six, high temperature high pressure process
Fiber after being processed by lignoenzyme is washed till PH=7, puts into the hydrogen peroxide of 8g/L and the mixing of the sodium hydroxide of 8g/L
Solution, is positioned in pressure cooker after adding boiling-off additive, and pressure is 0.15MPa, time 30min.
Seven, scutching-be dehydrated-dry/dry.
China-hemp fibers after process uses GB/T 18147.2-2008 " hemp test method part 2: residual gum content
Test method " to measure residual gum content be 2.26%, uses GB/T 18147.5-2000 " hemp test method the 5th part: disconnected
Resistance to spalling test method " mensuration fracture strength is 1.87cN/dtex, the china-hemp fibers softness obtained is fine and smooth, for optimal degumming bar
Part.
Embodiment 2
Comprising the following steps that of the freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers.
One, ultrasound wave-decocting in water processes
At ultrasonic power 350W, in the case of 80 DEG C, complete with deionized water (fiber concentration in the solution is 25g/L)
Soak fiber 100min, make it soak uniformly every suitable/counterclockwise alternate agitation of 10min.Wash several times with clear water, until its
Soak pH value is 7.
Two, preimpregnation acid treatment
At 50 DEG C, the dilute sulfuric acid using concentration to be 1.5g/L is completely soaked Gushi of Henan Fructus Cannabis raw ramie, and (fiber is at solution
In concentration be 25g/L) 100min, every 10min suitable/counterclockwise alternate agitation make it soak uniformly.Some with clear water washing
It is secondary, until its soak pH value is 7.
Three, UV-radiation treatment
Fiber after preimpregnation acid treatment is washed till PH=7, and the mixing putting into the hydrogen peroxide of 6g/L and the sodium hydroxide of 6g/L is molten
Liquid, adds boiling-off additive and is placed under the ultraviolet light of 280-350nm and radiates 40 minutes.
Four, freezing shock heating process
Take out the china-hemp fibers after UV-radiation treatment, put in pallet, be placed in and suddenly freeze freezing 40min in-55 DEG C of case.
Taking-up is freezed rear Fructus Cannabis and is placed in 40min in the constant temperature boiling water of 100 DEG C.
Five, lignoenzyme processes
Fiber after freezing-shock heating is washed till PH=7, dries, put in the lignoenzyme solution of PH=5, at 45 DEG C of constant temperature
Water-bath is reacted 2 hours.
Six, high temperature high pressure process
Fiber after being processed by lignoenzyme is washed till PH=7, puts into the hydrogen peroxide of 4g/L and the mixing of the sodium hydroxide of 4g/L
Solution, is positioned in pressure cooker after adding boiling-off additive, and pressure is 0.15MPa, time 30min.
Seven, scutching-be dehydrated-dry/dry.
China-hemp fibers after process uses GB/ T 18147.2-2008 " hemp test method part 2: cull
Rate test method " measure residual gum content be 5.31%, use GB/T 18147.5-2000 " hemp test method the 5th part:
Fracture strength test method " measure fracture strength be 2.2 cN/dtex, whiteness is 55.7, although residual gum content is slightly higher, but still has
There is spinnability, and chemical levels decreases.
Embodiment 3
Comprising the following steps that of the freezing shock heating lignoenzyme auxiliary degumming process of a kind of china-hemp fibers.
One, ultrasound wave-decocting in water processes
At ultrasonic power 350W, in the case of 70 DEG C, complete with deionized water (fiber concentration in the solution is 25g/L)
Soak fiber 80min, make it soak uniformly every suitable/counterclockwise alternate agitation of 10min.Wash several times with clear water, until its
Soak pH value is 7.
Two, preimpregnation acid treatment
At 60 DEG C, the dilute sulfuric acid using concentration to be 1.5g/L is completely soaked Gushi of Henan Fructus Cannabis raw ramie, and (fiber is at solution
In concentration be 25g/L) 100min, every 10min suitable/counterclockwise alternate agitation make it soak uniformly.Some with clear water washing
It is secondary, until its soak pH value is 7.
Three, UV-radiation treatment
Fiber after preimpregnation acid treatment is washed till PH=7, and the mixing putting into the hydrogen peroxide of 8g/L and the sodium hydroxide of 4g/L is molten
Liquid, adds boiling-off additive and is placed under the ultraviolet light of 280-350nm and radiates 20 minutes.
Four, freezing shock heating process
Take out the china-hemp fibers after UV-radiation treatment, put in pallet, be placed in and suddenly freeze freezing 40min in-35 DEG C of case.
Taking-up is freezed rear Fructus Cannabis and is placed in 40min in the constant temperature boiling water of 100 DEG C.
Five, lignoenzyme processes
Fiber after freezing-shock heating is washed till PH=7, dries, put in the lignoenzyme solution of PH=5, at 40 DEG C of constant temperature
Water-bath is reacted 3 hours.
Six, high temperature high pressure process
Fiber after being processed by lignoenzyme is washed till PH=7, puts into the hydrogen peroxide of 4g/L and the mixing of the sodium hydroxide of 8g/L
Solution, is positioned in pressure cooker after adding boiling-off additive, and pressure is 0.15MPa, time 20min.
Seven, scutching-be dehydrated-dry/dry.
The china-hemp fibers obtained uses GB/ T 18147.2-2008 " hemp test method part 2: residual gum content
Test method " measure residual gum content 4.41%, use GB/T 18147.5-2000 " hemp test method the 5th part: fracture
Strength Testing Methods " mensuration fracture strength is 2.01 cN/dtex, but still has spinnability, and chemical levels is the most
Reduce.
Claims (4)
1. the freezing shock heating lignoenzyme auxiliary degumming process of china-hemp fibers, is characterized in that after preimpregnation acid treatment, by fiber
It is 1:40 with the bath raio of solution, every liter of solution soaks 25 grams of fibers, carries out following steps:
(1) UV radiation treatment: the fiber after preimpregnation acid treatment is washed till pH=7, puts into the hydrogen peroxide of 4-8g/L and the hydrogen of 4-8g/L
The mixed solution of sodium oxide, adds boiling-off additive and is placed under the ultraviolet light of 280-350nm and radiates 20-40 minute；
(2) freezing shock heating process: the fiber after being radiated by UV is washed till pH=7, puts into pallet, freezing 20-40 minute, cryogenic temperature
For-15--55 DEG C, take out immediately after and be placed in the constant temperature boiling water of 100 DEG C 20-40 minute；
(3) lignoenzyme processes: the fiber after freezing-shock heating is washed till pH=7, dries, put into the lignoenzyme of pH=4.5-5.5
In solution, react 1-3 hour in 40-50 DEG C of water bath with thermostatic control；
(4) high temperature high pressure process: the fiber after being processed by lignoenzyme is washed till pH=7, puts into hydrogen peroxide and the 4-of 4-12g/L
The mixed solution of the sodium hydroxide of 12g/L, adds boiling-off additive and is positioned in pressure cooker, and pressure is 0.1-0.15MPa, the time
20-30min。
2. technique as claimed in claim 1, its described cooking additive be by waterglass sodium silicate 0.2g/L, sodium sulfide 2g/L,
Sodium tripolyphosphate 2g/L, sodium sulfite 0.8g/L and magnesium sulfate 2 g/L, stir acquisition.
3. technique as claimed in claim 1, the constant temperature boiling water that its described freezing is shock heating is the solution after UV-radiation.
4. technique as claimed in claim 1, composition and the content thereof of its described lignoenzyme solution is: liquid lignoenzyme 4-
12g/L, is adjusted to pH=4.5-5.5 with emulsifying agent by solution.
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