WO2020133857A1 - 一种禾草秸秆制备生物机械本色浆的方法 - Google Patents

一种禾草秸秆制备生物机械本色浆的方法 Download PDF

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WO2020133857A1
WO2020133857A1 PCT/CN2019/084971 CN2019084971W WO2020133857A1 WO 2020133857 A1 WO2020133857 A1 WO 2020133857A1 CN 2019084971 W CN2019084971 W CN 2019084971W WO 2020133857 A1 WO2020133857 A1 WO 2020133857A1
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pulp
alkaline
straw
biomechanical
grass
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PCT/CN2019/084971
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English (en)
French (fr)
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陈嘉川
吉兴香
杨桂花
田中建
王瑞明
郭玉倩
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齐鲁工业大学
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Priority to US16/954,275 priority Critical patent/US11624154B2/en
Publication of WO2020133857A1 publication Critical patent/WO2020133857A1/zh

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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14Disintegrating in mills
    • D21B1/16Disintegrating in mills in the presence of chemical agents
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00Pretreatment of the finely-divided materials before digesting
    • D21C1/02Pretreatment of the finely-divided materials before digesting with water or steam
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00Pretreatment of the finely-divided materials before digesting
    • D21C1/06Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005Treatment of cellulose-containing material with microorganisms or enzymes
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21DTREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00Methods of beating or refining; Beaters of the Hollander type

Definitions

  • the invention belongs to the field of papermaking technology and new materials, and in particular relates to a method for preparing biomechanical natural color pulp from wheat straw straw.
  • the present invention provides a method for preparing biomechanical natural color paste from wheat straw.
  • Using wheat straw as a raw material for pulping steaming or hot water is used to treat wheat straw, and then a small amount of alkali (NaOH or KOH) is added to adjust its pH to 10-14. After the wheat straw is thermally saturated and softened, the temperature of the wheat straw is adjusted. , Add alkaline composite enzyme for biological treatment, and finally grind wheat straw, the prepared mechanical pulp can meet the requirements of producing natural packaging paper and paper-based materials.
  • a method for preparing biomechanical natural color paste from grass straws includes the following steps:
  • step (3) Take out the straw stalks treated in step (2), and further treat them with hot alkaline water or steam at a temperature of 80-120°C;
  • step (3) treated straw is subjected to one or more stages of refining, so that the beating degree is 25-55°SR;
  • the second aspect of the present invention provides the mechanical pulp prepared by the method described above.
  • the third aspect of the present invention provides the application of the above-mentioned mechanical pulp in the preparation of natural packaging paper and paper-based materials.
  • the present invention uses grass as raw material, uses alkaline biological enzymes for treatment, and then grinds and cleans after hot alkali steam heating treatment.
  • the pH of the biomechanical pulp is close to neutral when the refining of the invention is completed, and the washing water of the refining is treated with a multi-effect evaporator, the solid residue is recovered for boiler incineration, and the recovered heat energy is used in the hot water pretreatment section, and the entire production process is Alkali recovery avoids environmental pollution from the source.
  • This technology is in line with the national industrial policy of resource conservation, economic cycle, energy saving and emission reduction. It overcomes the problems of straw pulp alkali wastewater difficult to recycle and serious pollution in the prior art; this is of great significance for the industrial production of straw pulp and the development of the paper industry.
  • the method of the invention is simple, has low requirements on equipment, and is suitable for the production of large and medium-sized paper-making enterprises.
  • the mechanical pulp ring pressure index prepared by the method of the invention is significantly improved, and used for preparing corrugated paper or boxboard paper, which can significantly improve the compressive strength of the carton.
  • a method for preparing biomechanical intrinsic color paste from grass straws which includes the following steps:
  • step (3) Take out the straw stalks treated in step (2), and further process them with hot alkali steam at a temperature of 100-120°C;
  • step (3) treated straw is subjected to one or more stages of refining, so that the beating degree is 25-55°SR;
  • the present invention first adopts alkaline biological enzyme to treat grass straw, which can degrade hemicellulose, lignin, pectin and other substances, and break and open the connection bond between cellulose, hemicellulose and lignin; At the same time, a small amount of alkali is added to make the pH of the slurry alkaline, so that lignin can be quickly dissolved out.
  • alkaline biological enzymes After being treated with alkaline biological enzymes, it is further treated with hot alkaline steam, which can fully swell and extract lignin, hemicellulose, etc. to further soften the straw pulp; at the same time, it reduces the damage to the fiber and guarantees the pulp Quality; steam heat treatment can also completely inactivate the biological enzymes in the straw pulp to avoid the influence of the biological enzymes on the subsequent pulping.
  • the alkaline biological complex enzyme used in step (2) is a compound enzyme of three enzymes of alkaline xylanase, alkaline cellulase and alkaline pectinase, and the total dosage is 30-120IU/mL;
  • the ratio of alkaline xylanase, alkaline cellulase and alkaline pectinase is 8 ⁇ 12:3-5:1.5 ⁇ 3.
  • step (2) the amount of alkali added in step (2) is 0.5%-3%.
  • the base used is NaOH or KOH.
  • the treatment temperature in step (2) is 45-60°C. Within this temperature range, the enzymatic hydrolysis efficiency is the highest.
  • the hot alkali steam treatment time in step (3) is 10-60 min. Within the range of the treatment time, lignin, hemicellulose and other components can be eluted, while avoiding the treatment time is too long, resulting in a decrease in the yield of pulp.
  • the pH value of the hot alkaline water in step (3) is 9-14.
  • the treatment with this pH value steam is the best.
  • the grass is wheat straw.
  • the second aspect of the present invention provides the mechanical pulp prepared by the method described above.
  • the mechanical pulp obtained by the invention not only has high yield, but also significantly improves tensile strength, ring compression strength and the like.
  • the third aspect of the present invention provides the application of the above-mentioned mechanical pulp in the preparation of primary color packaging paper and paper-based materials.
  • the mechanical pulp of the present invention can be used to make packaging paper or paper-based materials, such as corrugated paper and boxboard paper.
  • the mechanical pulp of the invention has high ring compression strength, and the prepared carton has the advantage of strong compression resistance.
  • the biological enzymes used are from Shandong Longcote Enzyme Preparation Co., Ltd. and Novozymes China Enzyme Preparation Co., Ltd.
  • Example 1 A method for preparing biomechanical natural color paste from wheat straw
  • the method includes the following steps:
  • step (3) Take out the wheat straw stalks processed in step (2), and then further treat the wheat straw stalks to soften and soften the wheat straw stalks with hot alkali water vapor at pH 14 and temperature 110°C for 60 minutes to dissolve some hemicellulose, lignin, pectin and other substances .
  • step (3) The wheat straw straw treated in step (3) is subjected to one-stage or multi-stage refining to make its beating degree at 42°SR.
  • Control method 1 Biological enzyme adopts acidic xylanase: For the mixture of hot water and wheat straw in the reactor or processor, adjust the pH to 4.8 with 0.1mol/L HAc-NaAC buffer, temperature 48°C, treatment time At 120min, the enzyme dosage is 100IU/mL, and the enzyme activity ratio of acid xylanase, acid cellulase, and acid pectinase is 8:3:1.5.
  • Control method 2 No biological enzyme treatment, other steps are the same as in Example 1.
  • the pulp tensile index is measured according to GB/T453-2002, and the pulp tear index is measured according to GB/T455-2002; the ring compression strength is measured according to GB/T2679.8-1995.
  • the indicators are shown in Table 1 below.
  • Example 2 A method for preparing biomechanical natural color paste from wheat straw
  • step (3) Take out the wheat straw stalks treated in step (2), and then further treat the wheat straw stalks to soften and soften the wheat straw stalks with hot alkali water vapor at pH 13 and temperature 120°C for 10 minutes to dissolve some hemicellulose, lignin, pectin and other substances .
  • step (3) The wheat straw straw treated in step (3) is subjected to one or more stages of refining, so that the beating degree is 40°SR.
  • Control method 1 Biological enzymes using xylanase: For the mixture of hot water and wheat straw in the reactor or processor, adjust the pH to 4.8 with 0.1mol/L HAc-NaAC buffer, temperature 48°C, and treatment time 120min The dosage of enzyme is 30IU/mL, and the ratio of enzyme activity of acid xylanase, acid cellulase and acid pectinase is 12:5:3.
  • Control method 2 No biological enzyme treatment, other steps are the same as in Example 2.
  • the pulp tensile index is measured according to GB/T453-2002, and the pulp tear index is measured according to GB/T455-2002; the ring compression strength is measured according to GB/T2679.8-1995.
  • the indicators are shown in Table 2 below.
  • Example 3 A method for preparing biomechanical natural color paste from wheat straw
  • step (3) Take out the wheat straw stalks processed in step (2), and then further treat the wheat straw stalks with hot alkali water vapor at pH 12 and temperature of 100°C to soften the wheat straw stalks for 30 minutes to dissolve some hemicellulose, lignin, pectin, etc. .
  • step (3) The wheat straw straw treated in step (3) is subjected to one-stage or multi-stage refining to make its beating degree 38°SR.
  • the ground pulp is copied into a corrugated base paper with a basis weight of 80g/m 2 and the physical indexes are tested. Each physical index can meet the requirements of general corrugated base paper.
  • the indexes are shown in Table 3 below.
  • Control method 1 Biological enzymes using xylanase: For the mixture of hot water and wheat straw in the reactor or processor, adjust the pH to 4.8 with 0.1mol/L HAc-NaAC buffer, temperature 48°C, and treatment time 120min The dosage of enzyme is 80IU/mL, and the ratio of enzyme activity of acid xylanase, acid cellulase and acid pectinase is 10:4:3. The other steps are the same as in Example 3.
  • Control method 2 No biological enzyme treatment, other steps are the same as in Example 3.
  • the pulp tensile index is measured according to GB/T453-2002, and the pulp tear index is measured according to GB/T455-2002; the ring compression strength is measured according to GB/T2679.8-1995.
  • the indicators are shown in Table 3 below.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
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Abstract

一种禾草秸秆制备生物机械本色浆的方法,以禾草为原料,采用碱性生物酶进行处理,然后经热碱蒸汽加热处理后磨浆、洗涤,即得。采用上述方法得到的机械浆以及机械浆在原色包装纸、纸基材料中的应用。

Description

一种麦草秸秆制备生物机械本色浆的方法 技术领域
本发明属于造纸技术与新材料领域,具体涉及一种麦草秸秆制备生物机械本色浆的方法。
背景技术
2016年我国纸浆进口达2106万吨,废纸进口达2850万吨,造纸纤维原料的进口依赖程度接近50%,废纸的大量进口弥补了我国纤维原料的缺口,支撑了造纸业的发展。2017年4月中央发布了《关于禁止洋垃圾入境推进固体废物进口管理制度改革实施方案》,明确规定从今年底起我国将禁止进口未经分选的废纸。2018年废纸进口总额为2017年的33%,到2020年,我国禁止进口废纸。我国正面临着每年的缺少2600万吨左右的造纸原料。传统造纸行业资源短缺的问题将进一步突显。研究开发新的造纸原料迫在眉睫,为此研究者,在可循环可再生的草类原料中挖掘发现,寻找新的造纸原料。
传统化学法制浆过程中,植物原料的大部分半纤维素被降解后溶解在制浆黑液中。通常采用燃烧法处理黑液,以回收热能和化学药品。由于黑液中的半纤维素燃烧热值很低,对其直接进行燃烧处理,不仅浪费能源,还耗用了很好的生物质资源。发展草类资源制浆造纸,目前最大的问题是污染问题,这是草浆存在的主要问题,也是草浆能否生存的关键问题。
因此,研究开发适用于草浆的低污染、低耗能、高质量的制浆方法是中国造纸行业研究重点,也是迫切需要突破的行业发展瓶颈。
利用生物酶和微生物的降解作用对草浆进行处理,是生物制浆的热门研究领域。利用酶和微生物与利用微生物处理相比,利用酶处理原料,由于不需灭菌处理和较大的发酵空间以及酶作用于底物具有专一性等特点,使其应用于制浆造纸工业更具有优势。但目前对酶预处理的生物制浆研究主要集中在化学制浆与漂白方面,用于麦草高得率浆和提高制浆性能的研究鲜有报道。
发明内容
针对以上所述问题,本发明提供一种麦草秸秆制备生物机械本色浆的方法。利用麦草秸秆作为制浆原料,采用汽蒸或热水处理麦草秸秆,然后加微量碱(NaOH或KOH),调节其pH值至10-14,对麦草秸秆进行热饱和软化后调节麦草秸秆的温度,加入碱性复合酶进行生物处理,最后对麦草秸秆进行磨浆,制备得到的机械浆能够满足生产本色包装类纸和纸基材料的要求。
本发明采用以下技术方案:
本发明第一个方面,提供一种禾草秸秆制备生物机械本色浆的方法,包括以下步骤:
(1)把物理挑选除尘后的风干禾草秸秆切成3-6cm长的备用原料;
(2)把备用原料放入常温处理器或反应釜中,按照1:4-1:8W/V的液比对禾草秸秆进行碱性复合酶作用处理,在处理过程,添加微量碱,使得禾草秸秆的pH值在7-10,处理时间控制在30-90min;
(3)将步骤(2)处理的禾草秸秆取出,用温度80-120℃的热碱水或热蒸汽进一步处理;
(4)将步骤(3)处理后的禾秸秆进行一段或多段磨浆,使其打浆度在25-55°SR;
(5)磨浆后进行水洗,得生物机械浆;磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能再用于步骤(1)热水或蒸汽处理;
(6)所得生物机械浆经纤维疏解器疏解、混合均匀,即得。
本发明第二个方面,提供以上所述方法制备得到的机械浆。
本发明第三个方面,提供以上所述机械浆在制备本色包装纸、纸基材料中的应用。
本发明取得的有益效果:
本发明以禾草为原料,采用碱性生物酶进行处理,然后在热碱蒸汽加热处理后磨浆、洗涤,即得。本发明磨浆完成时生物机械浆的pH接近中性,且磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能在用于热水预处理段,整个生产过程无需碱回收,从源头上避免了对环境的污染。该技术符合国家资源节约、经济循环、节能减排的产业政策。克服了现有技术中草浆碱废水难回收,污染严重的问题;这对于草浆的产业化生产及造纸行业的发展意义重大。
本发明方法简单,对设备要求较低,适用于广大中小型造纸企业的生产。
采用本发明方法制备得到的机械浆环压指数显著提高,用于制备瓦楞纸或箱板纸,可显著提高纸箱的抗压强度。
具体实施方式
应该指出,以下详细说明都是示例性的,旨在对本发明提供进一步的说明。除非另有指明,本文使用的所有技术和科学术语具有与本发明所属技术领域的普通技术人员通常理解的相同含义。
需要注意的是,这里所使用的术语仅是为了描述具体实施方式,而非意图限制根据本发明的示例性实施方式。如在这里所使用的,除非上下文另外明确指出,否则单数形式也意图包括复数形式,此外,还应当理解的是,当在本说明书中使用术语“包含”和/或“包括”时,其 指明存在特征、步骤、操作和/或它们的组合。
针对,背景技术中提出的问题,本发明第一个方面,提供一种禾草秸秆制备生物机械本色浆的方法,包括以下步骤:
(1)把物理挑选除尘后的风干禾草秸秆切成3-6cm长的备用原料;
(2)把备用原料放入常温处理器或反应釜中,按照1:4-1:8W/V的液比对禾草秸秆进行碱性复合酶作用处理,在处理过程,添加碱,使得禾草秸秆的pH值在7-10,处理时间控制在30-90min;
(3)将步骤(2)处理的禾草秸秆取出,用温度100-120℃的热碱蒸汽进一步处理;
(4)将步骤(3)处理后的禾秸秆进行一段或多段磨浆,使其打浆度在25-55°SR;
(5)磨浆后进行水洗,得生物机械浆;磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能再用于步骤(1)热水或蒸汽处理;
(6)所得生物机械浆经纤维疏解器疏解、混合均匀,即得。
本发明首选采用碱性生物酶处理禾草秸秆,可使半纤维、木素、果胶等物质发生降解,使纤维素与半纤维素、木素之间的连接键断裂、打开;酶处理的同时,添加微量的碱,使浆液的pH成碱性,可使木素快速溶出。经碱性生物酶处理后,再用热碱蒸汽进一步处理,热碱蒸汽可使木素、半纤维素等充分溶胀、抽出,使草浆进一步软化;同时减少了对纤维的损伤,保证了纸浆质量;蒸汽加热处理同时可使草浆中的生物酶完全失活,避免生物酶对后续制浆的影响。
进一步地,步骤(2)所用碱性生物复合酶为碱性木聚糖酶、碱性纤维素酶、碱性果胶酶三种酶的复配酶,总用量是30-120IU/mL;其中,碱性木聚糖酶、碱性纤维素酶、碱性果胶酶的酶活比例为8~12:3-5:1.5~3。
现有技术中,为保护生物酶活性,往往先采用热水或蒸汽对制浆原材料进行预处理,使材料中的金属离子大量溶出后,减少金属离子对生物酶活的影响。本发明碱性生物复合酶相互配合,降解效果显著;无需先用热水处理,保证了纸浆得率。
进一步地,步骤(2)添加碱的用量为0.5%-3%。
进一步地,所用碱为NaOH或KOH。
进一步地,步骤(2)处理温度为45-60℃。在该温度范围内,酶解效率最高。
进一步地,步骤(3)热碱水蒸汽处理时间为10-60min。在该处理时间范围内,可使木素、半纤维素等成分溶出,同时避免了处理时间过长,造成纸浆得率的降低。
进一步地,步骤(3)所述热碱水pH值9-14。采用该pH值蒸汽进行处理,效果最佳。
进一步地,所述禾草为麦草。
本发明第二个方面,提供以上所述方法制备得到的机械浆。本发明所得机械浆,不仅得率高,而且抗张强度、环压强度等均显著提高。
本发明第三个方面,提供以上所述机械浆在制备原色包装纸、纸基材料中的应用。本发明机械浆可用于制作包装纸或纸基材料,如用于制备瓦楞纸、箱板纸等。本发明机械浆的环压强度高,制备得到的纸箱具有抗压能力强的优势。
为了使得本领域技术人员能够更加清楚地了解本发明的技术方案,以下将结合具体的实施例详细说明本发明的技术方案。
采用的生物酶来自山东隆科特酶制剂有限公司、诺维信生物酶制剂中国公司。
实施例1一种麦草秸秆制备生物机械本色浆的方法
所述方法,包括以下步骤:
(1)把物理挑选除尘后的风干麦草秸秆切成3cm长的备用原料。
(2)把备用原料放入常温处理器或反应釜中,按照1:5kg/L的液比对麦草秸秆进行温水与碱性复合酶作用处理,在处理过程中,用NaOH调节pH值,使得麦草秸秆含水的pH值为8,处理时间控制在90min,温度在50℃,酶用量为100IU/mL,碱性木聚糖酶、碱性纤维素酶、碱性果胶酶的酶活比例为8:3:1.5。
(3)将步骤(2)处理的麦草秸秆取出,然后用pH值14,温度110℃的热碱水蒸汽进一步处理软化麦草秸秆,时间60min,溶出部分半纤维素、木素、果胶等物质。
(4)将步骤(3)处理后的麦草秸秆进行一段或多段磨浆,使其打浆度在42°SR。
(5)磨浆后进行水洗,得生物机械浆;磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能再用于步骤(1)热水或蒸汽处理;
(6)所得生物机械浆经纤维疏解器疏解、混合均匀,即得。
把磨好的浆抄制成定量70g/m 2瓦楞原纸,进行物理指标的测试,各项物理指标可满足一般瓦楞原纸的要求,指标如下表1所示。
对照方法1:生物酶采用酸性木聚糖酶:对反应釜或处理器中的热水和麦草秸秆混合物,用0.1mol/L HAc-NaAC缓冲液调节pH值为4.8,温度48℃,处理时间120min,酶用量为100IU/mL,酸性木聚糖酶、酸性纤维素酶、酸性果胶酶的酶活比例为8:3:1.5。
其它步骤均与实施例1相同。
对照方法2:未经生物酶处理,其它步骤均与实施例1相同。
依据GB/T453—2002测定纸浆抗张指数,依据GB/T455—2002测定纸浆撕裂指数;依据GB/T2679.8-1995进行环压强度测定。各指标如下表1所示。
表1不同方法生物机械浆的性能测定
Figure PCTCN2019084971-appb-000001
实施案例2一种麦草秸秆制备生物机械本色浆的方法
(1)把物理挑选除尘后的风干麦草秸秆切成4cm长的备用原料。
(2)把备用原料放入常温处理器或反应釜中,按照1:4kg/L的液比对麦草秸秆进行温水与碱性复合酶作用处理,在处理过程中,用NaOH调节pH值,使得麦草秸秆含水的pH值在9,处理时间控制在60min,温度55℃,酶用量为30IU/mL,碱性性木聚糖酶、碱性纤维素酶、碱性果胶酶的酶活比例为12:5:3。
(3)将步骤(2)处理的麦草秸秆取出,然后用pH值13,温度120℃的热碱水蒸汽进一步处理软化麦草秸秆,时间10min,溶出部分半纤维素、木素、果胶等物质。
(4)将步骤(3)处理后的麦草秸秆进行一段或多段磨浆,使其打浆度为40°SR。
(5)磨浆后进行水洗,得生物机械浆;磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能再用于步骤(1)热水或蒸汽处理;
(6)所得生物机械浆经纤维疏解器疏解、混合均匀,即得。
把磨好的浆抄制成定量60g/m 2瓦楞原纸,进行物理指标的测试,各项物理指标可满足一般瓦楞原纸的要求,指标如下表2所示。
对照方法1:生物酶采用木聚糖酶:对反应釜或处理器中的热水和麦草秸秆混合物,用0.1mol/L HAc-NaAC缓冲液调节pH值为4.8,温度48℃,处理时间120min,酶用量为30IU/mL,酸性木聚糖酶、酸性纤维素酶、酸性果胶酶的酶活比例为12:5:3。
其它步骤均与实施例2相同。
对照方法2:未经生物酶处理,其它步骤均与实施例2相同。
依据GB/T453—2002测定纸浆抗张指数,依据GB/T455—2002测定纸浆撕裂指数;依据GB/T2679.8-1995进行环压强度测定。各指标如下表2所示。
表2不同方法生物机械浆的性能测定
Figure PCTCN2019084971-appb-000002
Figure PCTCN2019084971-appb-000003
实施案例3一种麦草秸秆制备生物机械本色浆的方法
(1)把物理挑选除尘后的风干麦草秸秆切成5cm长的备用原料。
(2)把备用原料放入常温处理器或反应釜中,按照1:6kg/L的液比对麦草秸秆进行温水与碱性复合酶作用处理,在处理过程中,用NaOH调节pH值,使得麦草秸秆含水的pH值在8,处理时间控制在60min,温度50℃,酶用量为80IU/mL,碱性性木聚糖酶、碱性纤维素酶、碱性果胶酶的酶活比例为10:4:3。
(3)将步骤(2)处理的麦草秸秆取出,然后用pH值12,温度100℃的热碱水蒸汽进一步处理软化麦草秸秆,时间30min,溶出部分半纤维素、木素、果胶等物质。
(4)将步骤(3)处理后的麦草秸秆进行一段或多段磨浆,使其打浆度为38°SR。
(5)磨浆后进行水洗,得生物机械浆;磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能再用于步骤(1)热水或蒸汽处理;
(6)所得生物机械浆经纤维疏解器疏解、混合均匀,即得。
把磨好的浆抄制成定量80g/m 2瓦楞原纸,进行物理指标的测试,各项物理指标可满足一般瓦楞原纸的要求,指标如下表3所示。
对照方法1:生物酶采用木聚糖酶:对反应釜或处理器中的热水和麦草秸秆混合物,用0.1mol/L HAc-NaAC缓冲液调节pH值为4.8,温度48℃,处理时间120min,酶用量为80IU/mL,酸性木聚糖酶、酸性纤维素酶、酸性果胶酶的酶活比例为10:4:3。其它步骤均与实施例3相同。
对照方法2:未经生物酶处理,其它步骤均与实施例3相同。
依据GB/T453—2002测定纸浆抗张指数,依据GB/T455—2002测定纸浆撕裂指数;依据GB/T2679.8-1995进行环压强度测定。各指标如下表3所示。
表3不同方法生物机械浆的性能测定
Figure PCTCN2019084971-appb-000004
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。

Claims (10)

  1. 一种禾草秸秆制备生物机械本色浆的方法,其特征在于,包括以下步骤:
    (1)把物理挑选除尘后的风干禾草秸秆切成3-6cm长的备用原料;
    (2)把备用原料放入常温处理器或反应釜中,按照1:4-1:8W/V的液比对禾草秸秆进行碱性复合酶作用处理,在处理过程,添加碱,使得禾草秸秆的pH值在7-10,处理时间控制在30-90min;
    (3)将步骤(2)处理的禾草秸秆取出,用温度100-120℃的热碱蒸汽进一步处理;
    (4)将步骤(3)处理后的禾秸秆进行一段或多段磨浆,使其打浆度在25-55°SR;
    (5)磨浆后进行水洗,得生物机械浆;磨浆洗涤水采用多效蒸发器处理,回收固体残渣用于锅炉焚烧,回收热能再用于步骤(1)热水或蒸汽处理;
    (6)所得生物机械浆经纤维疏解器疏解、混合均匀,即得。
  2. 根据权利要求1所述的方法,其特征在于,步骤(2)所用碱性生物复合酶为碱性木聚糖酶、碱性纤维素酶、碱性果胶酶三种酶的复配酶,总用量是30-120IU/mL;其中,碱性木聚糖酶、碱性纤维素酶、碱性果胶酶的酶活比例为8~12:3-5:1.5~3。
  3. 根据权利要求1所述的方法,其特征在于,步骤(2)添加碱的用量为0.5%-3%。
  4. 根据权利要求1所述的方法,其特征在于,所用碱为NaOH或KOH。
  5. 根据权利要求1所述的方法,其特征在于,步骤(2)处理温度为45-60℃。
  6. 根据权利要求1所述的方法,其特征在于,步骤(3)热碱蒸汽处理时间为10-60min。
  7. 根据权利要求1所述的方法,其特征在于,步骤(3)所述热碱水pH值9-14。
  8. 根据权利要求1所述的方法,其特征在于,所述禾草为麦草。
  9. 权利要求1-8任一项所述方法制备得到的机械浆。
  10. 权利要求9所述机械浆在制备原色包装纸、纸基材料中的应用。
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