WO2012155380A1 - 用淀粉提高涂布纸或涂布纸板白度的方法 - Google Patents

用淀粉提高涂布纸或涂布纸板白度的方法 Download PDF

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Publication number
WO2012155380A1
WO2012155380A1 PCT/CN2011/076005 CN2011076005W WO2012155380A1 WO 2012155380 A1 WO2012155380 A1 WO 2012155380A1 CN 2011076005 W CN2011076005 W CN 2011076005W WO 2012155380 A1 WO2012155380 A1 WO 2012155380A1
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Prior art keywords
coating
parts
starch
coated
paper
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PCT/CN2011/076005
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English (en)
French (fr)
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臧永华
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天津科技大学
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Publication of WO2012155380A1 publication Critical patent/WO2012155380A1/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
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/30Luminescent or fluorescent substances, e.g. for optical bleaching
    • 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
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/44Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54Starch
    • 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
    • D21H19/00Coated paper; Coating material
    • D21H19/80Paper comprising more than one coating
    • D21H19/82Paper comprising more than one coating superposed

Definitions

  • the invention belongs to the field of pulp and papermaking, and in particular to a method for increasing the whiteness of coated paper or coated paperboard with starch.
  • 0BA fluorescent whitening agents
  • FWA fluorescent whitening agents
  • Coated paper coatings are mainly composed of inorganic or organic pigments, adhesives, etc., including pigments such as calcium carbonate, kaolin, titanium dioxide, plastic pigments, etc.
  • Adhesives include synthetic styrene-butadiene latex, styrene-acrylic latex and natural polymers such as starch, protein, etc. .
  • the affinity of 0BA with commonly used pigments and latex adhesives is very small, and the water-soluble 0BA can penetrate into the interior of the paper with water after application, so that the whitening efficiency of 0BA is greatly reduced.
  • the coated paper industry typically employs a water soluble polymer such as polyvinyl alcohol (PVA) or carboxymethyl cellulose (CMC) as a carrier for 0BA to increase the retention of 0BA in the coating.
  • PVA polyvinyl alcohol
  • CMC carboxymethyl cellulose
  • the object of the present invention is to overcome the deficiencies of the prior art and to provide a low cost and environmentally friendly method for improving the whiteness of coated paper and coated paperboard with starch.
  • the method is suitable for producing a plurality of coated papers and coatings.
  • Cardboard includes coated paper, coated white cardboard, coated box paperboard, coated kraft paperboard, coated gray whiteboard, and the like.
  • a method for increasing the efficiency of a fluorescent whitening agent in coated paper or coated paperboard by using starch the starch content in the primer coating is 3-20% of the total weight of the primer coating, and the top coating is coated with a surface coating 0% ⁇ 0. 1-2. 0% of the fluorescent whitening agent.
  • the starch content of the primer coating is 5-15% of the total weight of the primer coating.
  • the primer coating comprises: starch: 3-20 parts, latex 0-20 parts, calcium carbonate: 10-90 parts, kaolin: 10-80 parts, titanium white powder: 0-10 parts.
  • the top coating comprises: a fluorescent whitening agent: 0. 3-2. 0 parts, a fluorescent whitening agent carrier 0-1. 5 parts, latex 8-20 parts, calcium carbonate: 10-90 parts, kaolin : 10-80 parts.
  • the intermediate coating is also included, and the composition of the intermediate coating is: starch: 5-20 parts, water resistant agent: 0. 2-2. 0 parts, latex 0-20 parts, calcium carbonate: 10-90 parts, kaolin: 10-80 parts.
  • the coating amount of the single-side intermediate coating layer is 0-12 g/m 2 , and the total coating amount of the single-sided three-layer coating is not more than 45 g/m 2 .
  • coating additives for papermaking are also included.
  • the auxiliary agent includes a dispersing agent, an antifoaming agent, a lubricant, a water retaining agent, a bactericide, a crosslinking agent, a water repellent, a thickener, and a toughening agent.
  • the one-side coating amount of the primer coating is 6-20 g/m 2
  • the one-side coating amount of the top coating layer is 6-20 g/m 2 .
  • the total coating amount of the one-side coating of the primer coating, the intermediate coating, and the top coating is from 15 to 45 g/m 2 .
  • the method provided by the present invention utilizes in principle the characteristics of inexpensive starch which can retain 0BA on the surface of the paper, and also replaces the expensive synthetic latex adhesive in the coating and reduces the expensive 0BA carrier PVA and CMC in the coating in the coating.
  • the amount of use, etc. is not only conducive to environmental protection, but also greatly reduces production costs.
  • the invention has wide application range and is suitable for producing single-sided or double-coated paper and coated paperboard, such as coated paper and coated white card, which are manufactured by using two-layer (double-coating) or three-layer coating process. Paper, coating box board, coated gray board, coated kraft paper, etc., the process is simple and easy to use the paper mill's existing production line.
  • the present invention achieves higher paper whiteness by adding starch to the primer at a lower coating amount, and reduces the negative influence of the coating on the mechanical properties of the coated paper or coated paperboard. 4.
  • the present invention has found that the partial or total latex adhesive of starch in the primer coating or 3-20% starch can greatly improve the whitening efficiency of the fluorescent whitening agent in the coated paper coating. In the environmental sense, it helps the paper industry to replace the synthetic petrochemical latex with cheap natural starch. It also reduces the raw material cost of papermaking because starch replaces latex and 0BA carrier.
  • Primer (Precoat) Coating and topcoating can be carried out by coating apparatuses commonly used in paper mills such as air knives, doctor blades, curtain coaters and the like.
  • the coating amount of the one-side primer and the top coating may be from 6 to 20 g/m 2 .
  • the total amount of one-side coating of the double coated paper is not more than 40 g/m 2 .
  • the coated base paper or paperboard used in the present invention may be prepared by any ratio of bleached chemical pulp, unbleached chemical pulp, high yield pulp, mechanical pulp, recycled pulp, deinked pulp, and non-wood pulp. Paper such as copper base paper, gray paperboard, cardboard paper and kraft paperboard.
  • a method for increasing the whiteness of a coated paper or a coated paperboard with starch This embodiment relates to the effect of replacing a portion of the latex with a starch in a primer coating on the whiteness of the coated recycled board paper:
  • the primer coating was applied to a recycled cardboard paper having a basis weight of 141 g/m 2 and a whiteness of 15.8%, and the amount of the primer applied was 10 ⁇ lg / m 2 .
  • the coating has a solid content of about 60% and a pH of about 8.5.
  • the primer coating includes:
  • kaolin more than 90% less than 2 microns
  • 40 parts (55 grades) of calcium carbonate 5 parts of styrene-butadiene latex, 10 parts of starch,
  • excipients dispersant (sodium polyacrylate), 0.2 parts; defoamer (polyethylene glycol) 0.03 parts; lubricant (hard Calcium citrate) 0.3 parts; Water-resistant agent (polyamide polyurea resin) 0.5 parts.
  • a starch-free primer coating was applied to a recycled cardboard paper having a basis weight of 141 g/m 2 and a whiteness of 15.8%, and the amount of the primer coating was 10 ⁇ lg / m 2 .
  • the coating has a solid content of about 60% and a pH of about 8.5.
  • the primer coating (without starch) includes:
  • kaolin 60 parts (more than 90% less than 2 microns) kaolin, 40 parts (55 grades) calcium carbonate, 12 parts of styrene-butadiene latex, other excipients: dispersant (sodium polyacrylate), 0.2 parts; defoamer (polyethylene glycol) 0.03%; lubricant (calcium stearate) 0.3 parts; water-resistant agent (polyamide polyurea resin) 0.5 parts.
  • dispersant sodium polyacrylate
  • defoamer polyethylene glycol
  • lubricant calcium stearate
  • water-resistant agent polyamide polyurea resin
  • the top coat amount was 17 ⁇ lg / m 2 .
  • the coating has a solid content of about 60% and a pH of about 8.5.
  • the top coating includes:
  • excipients dispersant (sodium polyacrylate), 0.2 parts; defoamer (polyethylene glycol) 0.03 parts; lubricant (calcium stearate) 0.3 parts; water resistant agent (polyamide polyurea resin) 0.5 parts.
  • the base paper contains starch (Example 1-1), paper whiteness (GB/T 7974-2002, the same below) and its CIE whiteness (ISO 11475:2004, the same below) ) 82.3% and 96.6%, respectively, and the whiteness and CIE whiteness of the base coating without starch (Example 1-2) were 75.4% and 80.5%, respectively, while the conventional coating (no primer, no starch) No whitening agent was added to the coating.
  • the whiteness and CIE whiteness of the coated coating box were 74.0% and 76.0%, respectively. See Table-1, which indicated that 7 parts of the base coating were replaced with 10 parts of starch.
  • the latex can greatly improve the whitening efficiency of OBA in the top coat, especially when using the same top coat (adding 0.6 parts of fluorescent whitening agent), the CIE whiteness of the coated box board is increased from 80.5% to 96.6% ( Table 1 ).
  • Example 2
  • a method for increasing the whiteness of coated paper or coated paperboard with starch This embodiment relates to the effect of the OBA carrier on the whiteness of the coated linerboard in the topcoat:
  • a top coat containing 0.6 parts of a 4S-type fluorescent whitening agent and 1 part of a ruthenium carrier (PVA) was applied to a reconstituted cardboard paper containing 10 parts of starch and 5 parts of latex-coated base paper of Example 1. .
  • the coating has a solid content of about 60% and a pH of about 8.5.
  • the top coat includes:
  • the top coating amount was 17 ⁇ lg/m 2 . After two coatings, the whiteness of the coating box board was about 84.5%, and the whiteness of CIE was about 106.3%.
  • the top coat also includes:
  • the top coat amount was 17 ⁇ lg / m 2 .
  • the coating box paperboard whiteness is about 80.3%, and its CIE whiteness is about 93.9% (see Table D o).
  • the whiteness of the coating box containing starch (Example 2-1) and starch-free (Example 2-2) in the primer coating is 84.5% and 80.3%, respectively, CIE whiteness It was 106.3% and 93.9%.
  • the starch-substituted latex not only reduced the cost of the adhesive in the coating, but also increased the whiteness of the coated linerboard by 4 units and the CIE whiteness by 13 units (Table 1).
  • a method for increasing the whiteness of coated paper or coated paperboard with starch this embodiment relates to the effect of starch-substituted latex on the whiteness of coated kraft paperboard
  • a kraft l inerboard was prepared by using an unbleached softwood kraft pulp, and the base paper was prepared to have a basis weight of 100 ⁇ 2 g/m 2 and a whiteness of 20.5%, which was used as a coated kraft base paper.
  • a primer coating to the kraft paperboard using a coating device comprising 60 parts of kaolin (90% or more and less than 2 micrometers), 40 parts (55 grades) of calcium carbonate, and 8 parts of butylbenzene. Latex, 6 parts starch, other common coating additives such as: dispersants, water repellents, defoamers, lubricants. The coating amount was 12 ⁇ lg / m 2 .
  • top coat to the primed kraft paper using a coating device, wherein the top coat comprises 60 parts of fine kaolin (92% or more and less than 2 microns) and 40 parts (95). Calcium carbonate, 12 parts of styrene-butadiene latex,
  • the coating amount was 17 ⁇ lg / m 2 .
  • the whiteness (brightness) of the paper is 81.2%
  • the whiteness of CIE is 92.5
  • the coated kraft paper coated with no starch in the primer coating (whiteness is 78.6) %
  • CIE whiteness is 85.4%)
  • a method for increasing the whiteness of coated paper or coated paperboard with starch this embodiment relates to the effect of starch-substituted latex on whiteness of coated white paperboard (white top)
  • the coated white paperboard base paper provided by the paper mill has a basis weight of about 220 g/m 2 and a whiteness of about 73.5%, which is used as a coated base paper.
  • a starch-containing primer coating to the coated base paper by using a coating device comprising 60 parts of kaolin (90% or more and less than 2 ⁇ m) and 40 parts (55 grades) of calcium carbonate, 8 Butyl styrene latex, 6 parts starch, other common coating additives such as: dispersants, water repellents, defoamers, lubricants.
  • the coating amount was ll ⁇ lg / m 2 .
  • a starch-free primer coating was applied to the above-mentioned coated base paper using the same coating device, and the primer coating included 60 parts of kaolin (90% or more and less than 2 ⁇ m) and 40 parts (55).
  • Grade) Calcium carbonate 12 parts of styrene-butadiene latex, other common coating additives such as: dispersant, water repellent, defoamer, lubricant.
  • the coating amount was ll ⁇ lg / m 2 .
  • top coat comprises 60 parts of fine-grained kaolin (92% or more and less than 2 ⁇ m) and 40 parts ( Grade 98) Calcium carbonate, 12 parts of styrene-butadiene latex, 0.8 parts of PVA, 0.8 parts of 4S fluorescent whitening agent, other common coating additives such as: dispersing agents, water repellents, defoamers, lubricants.
  • the coating amount was 17 ⁇ lg / m 2 .
  • the whiteness (brightness) and CIE whiteness of the coated white paperboard with 6 parts of starch replaced by 6 parts of starch in the primer were 86.0% and 96.4%, respectively, and coated with the primer.
  • the coated white paperboard without starch in the coating (whiteness is 81.9%, CIE whiteness is 85.3%).
  • 4 parts of latex is used to increase the whiteness of coated white paper by 4.1 units.
  • CIE whiteness increased by 10.1 units, see Table 3.
  • a method of increasing the whiteness of coated paper or coated paperboard with starch This embodiment relates to a method for producing high-grade coated paper at a lower cost by using a method for improving the efficiency of OBA whitening by starch.
  • the coated base paper is prepared, and the composition and ratio of the slurry are:
  • APMP Alkaline hydrogen peroxide mechanical pulp
  • NNKP Bleached softwood chemical pulp
  • LKP Bleached hardwood chemical pulp
  • the base paper thus obtained had a basis weight of 100 ⁇ 2 g/m 2 and a whiteness of 74%.
  • the primer coating contains 10 parts of starch.
  • the coating has a solid content of about 60% and a pH of about 8.5.
  • the primer coating formulation is as follows:
  • Heavy calcium carbonate grade 55: 70 parts; kaolin (more than 90% less than 2 microns): 30 parts; styrene-butadiene latex: 8 parts; Starch: 10 parts; Water repellent (polyamide polyurea): 0.5 parts; Rutile type titanium dioxide (micron), 5 parts, Other excipients: Dispersant, 0.2 parts; Antifoaming agent 0.03 parts; Lubricant 0.5 parts.
  • Top coat was applied by means of a coating device, and double-sided coating was applied, and the amount of coating per side was 11 to 14 g/m 2 .
  • the topcoat contains 1 part of OBA and 1 part of PVA as the OBA carrier.
  • the coating has a solid content of about 60% and a pH of about 8.5.
  • the topcoat formulation is as follows:
  • Heavy calcium carbonate grade 98: 80 parts; fine-grained kaolin (92% less than 2 microns), 20 parts; styrene-butadiene latex: 15 parts; fluorescent whitening agent: 1 part, tetrasulfonic acid type liquid whitening agent; Polyvinyl alcohol: 1 part, polymerization degree 300 ⁇ 500;
  • excipients 0.2 parts of dispersant, 0.03 parts of defoamer, 0.3 parts of lubricant, and 0.5 parts of water resistant agent.
  • Table-1 Effect of 0BA and its carrier (PVA) content on the whiteness of coated remanufactured box in the starch content of the primer coating (the total coating amount is about 27 ⁇ 3 g/m 2 , see Example 1) And example 2).
  • Table 2 Effect of starch-substituted latex on whiteness of coated kraft paper (base paper whiteness 20.5%, see example 3) Starch and latex content in the primer coating 0 parts starch 6 parts starch

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Description

用淀粉提高涂布纸或涂布纸板白度的方法 技术领域
本发明属于制浆造纸领域, 尤其是一种用淀粉提高涂布纸或涂布纸板白度的方 法。
背景技术
造纸工业大量使用荧光增白剂 (0BA或者 FWA) 改善涂布和未涂布纸张的白度与色调。 0BA是一类分子自身具有吸收紫外光并在可见光区域发射出蓝光的能力的物质。 添加在纸 页中的 0BA发出的蓝光 (约在 440nm附件) 可以补偿纸浆纤维自身的浅黄色, 从而提高纸 页的可测白度和视觉白度。
水溶性的荧光增白剂也经常被添加在涂布纸涂料中以改善纸张的光学性能和印刷适 性。 涂布纸涂料主要由无机或有机颜料、 胶粘剂等成分组成,其中颜料包括碳酸钙、 高岭 土、 钛白粉、 塑性颜料等, 胶粘剂包括合成丁苯胶乳、 苯丙胶乳和天然高分子如淀粉、 蛋 白质等。 但是, 0BA和常用颜料及乳胶胶粘剂的亲和性很小, 水溶性的 0BA在施涂后可以 随着水份渗透到纸张内部, 使 0BA的增白效率大大降低。 涂布纸工业一般采用水溶性高分 子如聚乙烯醇 (PVA) 或羧甲基纤维素 (CMC) 作为 0BA的载体, 提高 0BA在涂层中的留着 率。 2011年 1月 13日公开的美国专利 METHOD FOR IMPROVING THE PERFORMANCE OF OPTICAL BRIGHTENING AGENTS" (提高 OBA效率的方法) (申请号: 12/499916)发现在 涂料中添加甘油类聚合物 (polyglycerol ) 也可以提高 OBA的增白效率。
作为 0BA载体的水溶性高分子如 PVA和 CMC—般价格较高。 随着环保意识的增强和石 化产品价格的上涨, 廉价的天然水溶性高分子淀粉及其衍生物被越来越多的作为辅助胶粘 剂取代部分或者全部涂料中的胶乳。 通过检索发现, 2010年 6 月 10 日公开的美国专利 " SURFACE TREATMENT OF SUBSTRATE OR P APER/PAPERB O ARD PRODUCTS USING OPTICAL BRIGHTENING AGENT" (用 OBA对纸和纸板进行表面处理) (申请号: 12/623950) 公开了把 0BA喷淋在施胶过一层淀粉的纸页上, 其增白效果明显高于喷淋在没有用淀粉施 胶过的纸张。
上述专利发现了用淀粉表面施胶能够提高喷淋在未涂布纸表面的荧光增白剂的 效率, 与上述专利明显不同, 本专利发现廉价的淀粉不但能取代涂料中昂贵的胶乳胶 粘剂, 还能够提高涂层中荧光增白剂的增白效率。
发明目的 本发明的目的在于克服现有技术的不足之处, 提供一种成本低、 环保的用淀粉提高涂 布纸和涂布纸板白度的方法, 本方法适用于生产多种涂布纸和涂布纸板包括铜版纸、 涂布 白卡纸、 涂布箱纸板、 涂布牛皮卡纸、 涂布灰底白板等。
本发明实现目的的技术方案如下:
一种用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方法, 底涂涂料中的淀粉含量 为底涂涂层总重量的 3-20%,面涂涂料中含有为面涂涂层总重量的 0. 1-2. 0%的荧光增白剂。
而且, 底涂涂料中的淀粉含量为底涂涂层总重量的 5-15%。
而且, 面涂涂料中的荧光增白剂含量为面涂涂层总重量的 0. 3-1. 5%。
而且, 所述底涂涂料包括: 淀粉: 3-20份、 胶乳 0-20份、 碳酸钙: 10-90份、 高岭 土: 10-80份、 钛白粉: 0-10份。
而且, 所述面涂涂料包括: 荧光增白剂: 0. 3-2. 0份、 荧光增白剂载体 0-1. 5份、 胶 乳 8-20份、 碳酸钙: 10-90份、 高岭土: 10-80份。
而且, 还包括中层涂料, 中涂涂料的组成为: 淀粉: 5-20份、 抗水剂: 0. 2-2. 0份、 胶乳 0-20份、碳酸钙: 10-90份、高岭土: 10-80份。单面中涂涂层的涂布量为 0_12 g/m2, 单面三层涂布的涂布总量不大于 45 g/m2
而且, 还包括造纸用涂料助剂。
而且, 所述助剂包括分散剂、 消泡剂、 润滑剂、 保水剂、 杀菌剂、 交联剂、 抗水剂、 增稠剂, 增韧剂。
而且, 所述底涂涂料的单面涂布量为 6-20 g/m2, 所述面涂涂层的单面涂布量为 6-20 g/m2
而且, 底涂涂料、 中层涂料、 面涂涂料的单面涂布的总涂布量为 15-45 g/m2
本发明的优点和积极效果如下:
1、 本发明提供的方法在原理上利用了廉价的淀粉能够把 0BA保留在纸张表面的特性, 还取代了涂料中昂贵的合成胶乳胶粘剂和降低了涂料中昂贵的 0BA载体 PVA和 CMC在涂料 中的用量等, 不但有利于环境保护, 还大大降低了生产成本。
2、 本发明的应用范围广泛, 适用于生产多种利用两层 (双涂) 或三层涂布工艺制造 的单面或双面涂布纸和涂布纸板, 如铜版纸、 涂布白卡纸、 涂布箱纸板、 涂布灰底白板、 涂布牛皮卡纸等, 工艺简单、 易于利用造纸厂现有的生产线实现。
3、 本发明通过在底漆中添加淀粉以较低的涂布量得到较高的成纸白度, 降低了涂层 对涂布纸或涂布纸板力学性能的负面影响。 4、本发明发现了在底涂涂料中以淀粉为主体或者用 3-20%的淀粉取代部分或者全 部胶乳胶粘剂能够大大提高涂布纸涂层中荧光增白剂的增白效率, 本发明不但在环保 意义上有助于造纸工业使用廉价的天然淀粉取代合成的石化产品胶乳, 还因为淀粉同 时取代了胶乳和 0BA载体而能够进一步降低造纸的原料成本。
具体实施方式
下面结合实施例对本发明的技术内容做进一步说明; 下述实施例是说明性的, 不 是限定性的, 不能以下述实施例来限定本发明的保护范围。
需要说明的是: 以下实施例中所有原料均为市售产品, 均属于造纸用化学品, 除特殊 说明外, 标明功能的成分均具有造纸领域的普遍性, 不具有特殊性, 均为本领域公知技术, 故没有列出详细信息, 但均不会影响本发明的实施性。 以下实施例涉及白度 (又称亮度) 均为 GB/T 7974-2002中定义的白度, 检测方法同国标中的记载, 涉及的 CIE白度均为 ISO 11475:2004 中定义的 CIE白度, 检测方法按照 ISO 11475:2004 中的规定, 无特殊含义, 所使用的涂布装置均为本领域常用装置, 无特殊要求。
在公开发表的文献中, 由于淀粉的粘合能力稍弱于胶乳, 一般以 1.3-2份的淀粉取代 1 份胶乳。 底涂 (预涂) 涂布和面涂涂布都可采用造纸厂常用的涂布装置如气刀、 刮刀、 帘 式涂布机等。 单面底涂和面涂涂层的涂布量可在 6-20 g/m2。 双涂涂布纸的单面涂布总量 不大于 40 g/m2。 还可以根据实际需要在底涂 (底涂) 之后面涂之前施加中层涂布, 即在 底涂和面涂之间施涂中层涂料, 单面中层涂层的涂布量可为 6-12 g/m2, 但单面三层涂布 的涂布总量不大于 45 g/m2
用于本发明的涂布原纸或纸板可以是由漂白化学浆、 未漂白化学浆、 高得率浆、 机械 浆、 再生纸浆、 脱墨再生浆、 及非木浆等浆料按照任何比例配抄的纸张如铜版原纸、 灰底 白纸板、 箱板纸和牛皮卡纸等。
实施例 1 :
一种用淀粉提高涂布纸或涂布纸板白度的方法, 本实施例涉及底涂涂料中用淀粉取代 部分胶乳对涂布再生箱板纸白度的影响:
(1)将底涂涂料施涂在定量为 141g/m2, 白度为 15.8%的再生箱板纸上, 底涂涂布量为 10±lg/m2。 涂料固含量约 60%, pH在 8.5左右, 该底涂涂料包括:
60份高岭土 (90%以上小于 2微米)、 40份 (55级) 碳酸钙、 5份丁苯胶乳、 10份淀 粉,
其他辅料: 分散剂 (聚丙烯酸钠), 0.2份; 消泡剂 (聚乙二醇) 0.03 份; 润滑剂 (硬 脂酸钙) 0.3份; 抗水剂 (聚酰胺聚脲树脂) 0.5份。
(2)作为比较样品,将不含淀粉的底涂涂料施涂在定量为 141g/m2, 白度为 15.8%的再生 箱板纸上, 底涂涂布量为 10±lg/m2。 涂料固含量约 60%, pH在 8.5左右, 该底涂涂料(不 含淀粉) 包括:
60份 (90%以上小于 2微米) 高岭土、 40份 (55级) 碳酸钙、 12份丁苯胶乳, 其他辅料: 分散剂 (聚丙烯酸钠), 0.2份; 消泡剂 (聚乙二醇) 0.03% ; 润滑剂 (硬脂 酸钙) 0.3份; 抗水剂 (聚酰胺聚脲树脂) 0.5份。
(3)采用施涂装置, 将面涂涂料分别施涂在经含有淀粉的涂料底涂过 (例 1-1 ) 和不含 淀粉的涂料底涂过(例 1-2 )的再生箱板纸上,面涂涂布量为 17±lg/m2。涂料固含量约 60%, pH在 8.5左右, 该面涂涂料包括:
60份细粒高岭土(92%以上小于 2微米)、 40份重质碳酸钙(98级)、 12份丁苯胶乳、 0.6份 4S型荧光增白齐 U ( OBA ) ,
其他辅料: 分散剂 (聚丙烯酸钠), 0.2份; 消泡剂 (聚乙二醇) 0.03 份; 润滑剂 (硬 脂酸钙) 0.3份; 抗水剂 (聚酰胺聚脲树脂) 0.5份。
(4)经过两次涂布后, 底层涂料中含有淀粉(例 1-1 ) 的成纸白度(GB/T 7974-2002, 下 同)和其 CIE白度 (ISO 11475:2004, 下同)分别为 82.3%和 96.6%, 底涂中不含淀粉(例 1-2) 的成纸白度和 CIE白度分别为 75.4%和 80.5%, 而常规涂料 (底涂中不含淀粉、 面涂 中不添加荧光增白剂) 涂布的涂布箱纸板白度和 CIE白度则分别为 74.0%和 76.0%, 见表 -1, 说明了在底涂涂料中用 10份淀粉取代 7份胶乳能够大幅度提高面层涂料中 OBA的增 白效率, 特别表现在使用相同面涂涂料 (添加 0.6份荧光增白剂) 时, 涂布箱纸板的 CIE 白度从 80.5%提高到 96.6% (表 -1 )。 实施例 2:
一种用淀粉提高涂布纸或涂布纸板白度的方法,本实施例涉及面涂涂料中含有 OBA载 体对涂布箱板纸白度的影响:
(1)将含有 0.6份 4S型荧光增白剂和 1份 ΟΒΑ载体 (PVA) 的面涂涂料施涂在经实施 例 1中含有 10份淀粉和 5份胶乳底涂过的再生箱板纸上。 涂料固含量约 60%, pH在 8.5 左右, 该面涂涂料包括:
60份细粒高岭土 (92%以上小于 2微米)、 40份 (98级) 碳酸钙、 12份丁苯胶乳、 0.6 份 4S型荧光增白剂、 1份聚乙烯醇 (PVA作为 ΟΒΑ载体), 其他辅料: 分散剂, 0.2份; 消泡剂 0.03份、 润滑剂 0.3份、 抗水剂 0.5份。
面涂涂布量为 17±lg/m2, 经过两次涂布后, 涂布箱纸板的白度约为 84.5%, CIE白度 约为 106.3%。
(2)将含有 0.6份 4S型荧光增白剂和 1份 OBA载体 (PVA) 的面涂涂料同样施涂在经 实施例 1 中不含淀粉的底涂 (含有 12份胶乳) 涂料底涂过的再生箱板纸上。 涂料固含量 约 60%, pH在 8.5左右, 该面涂涂料同样包括:
60份细粒高岭土 (92%以上小于 2微米)、 40份 (98级) 碳酸钙、 12份丁苯胶乳、 0.6 份 4S型荧光增白剂、 1份聚乙烯醇 (PVA作为 OBA载体), 其他辅料: 分散剂, 0.2份; 消泡剂 0.03份、 润滑剂 0.3份、 抗水剂 0.5份。
面涂涂布量为 17±lg/m2。 经过两次涂布后, 涂布箱纸板白度约为 80.3%, 其 CIE白度 约为 93.9% (见表 D o
(3)经过两次涂布后, 底涂涂料中含有淀粉 (例 2-1 )和不含淀粉 (例 2-2) 的涂布箱纸 板白度分别为 84.5%和 80.3% , CIE白度分别为 106.3%禾 B 93.9%。 淀粉取代胶乳不但降低 了涂料中胶粘剂的成本,还使涂布箱板纸的白度提高了 4个单位, CIE白度提高了 13个单 位 (表 1 )。
实施例 3:
一种用淀粉提高涂布纸或涂布纸板白度的方法, 本实施例涉及淀粉取代胶乳对涂布 牛皮卡纸白度的影响
( 1 ) 用未漂白针叶木硫酸盐浆抄造本色牛皮卡纸 (kraft l inerboard), 所抄造的原 纸定量为 100 ±2g/m2, 白度为 20.5%, 作为涂布牛皮卡原纸备用。
( 2 ) 采用涂布装置, 将底涂涂料涂在上述牛皮卡纸上, 该底涂涂料包括 60 份 高岭 土 (90%以上小于 2微米)、 40份 (55级) 碳酸钙、 8份 丁苯胶乳、 6份 淀粉, 其他常 用涂料助剂如: 分散剂、 抗水剂、 消泡剂、 润滑剂。 涂布量为 12±lg/m2
( 3 ) 采用涂布装置, 将面涂涂料施涂在经过底涂的牛皮卡纸上, 其中该面涂涂料包 括 60份 细粒高岭土 (92%以上小于 2微米)、 40份 (95级) 碳酸钙、 12份 丁苯胶乳、
0.8份 CMC、 0.8份 4S型荧光增白剂, 其他常用涂料助剂如: 分散剂、 抗水剂、 消泡剂、 润滑剂。 涂布量为 17±lg/m2
( 4) 经过两次涂布后, 成纸的白度 (亮度) 为 81.2%, CIE白度为 92.5, 与涂布在底 涂涂料中不添加淀粉的涂布牛皮卡纸 (白度为 78.6%、 CIE白度为 85.4% ) 比较, 底涂涂 料中用 6份淀粉取代 4份胶乳使涂布牛皮卡纸的白度提高了 2.6个单位, CIE白度提高了 7.1个单位, 见表 2。
实施例 4:
一种用淀粉提高涂布纸或涂布纸板白度的方法, 本实施例涉及淀粉取代胶乳对涂布白 纸板 (white top) 白度的影响
(1) 造纸厂提供的涂布白纸板原纸, 定量约为 220g/m2, 白度约为 73.5%, 作为涂布 原纸备用。
(2) 采用涂布装置, 将含有淀粉的底涂涂料涂在上述涂布原纸上, 该底涂涂料包括 60份 高岭土 (90%以上小于 2微米)、 40份 (55级) 碳酸钙、 8份 丁苯胶乳、 6份 淀 粉, 其他常用涂料助剂如: 分散剂、 抗水剂、 消泡剂、 润滑剂。 涂布量为 ll±lg/m2
(3) 作为比较样品, 将不含淀粉的底涂涂料使用相同涂布装置施涂在上述涂布原纸 上, 该底涂涂料包括 60份 高岭土 (90%以上小于 2微米)、 40份 (55级) 碳酸钙、 12 份 丁苯胶乳、其他常用涂料助剂如:分散剂、抗水剂、消泡剂、润滑剂。涂布量为 ll±lg/m2
(4) 采用涂布装置, 将面涂涂料分别施涂在上述两种经过底涂的白纸板上, 其中该 面涂涂料包括 60份 细粒高岭土(92%以上小于 2微米)、 40份(98级)碳酸钙、 12份 丁 苯胶乳、 0.8份 PVA、 0.8份 4S型荧光增白剂, 其他常用涂料助剂如: 分散剂、 抗水剂、 消泡剂、 润滑剂。 涂布量为 17±lg/m2
(5) 经过两次涂布后, 底涂中用 6份淀粉取代 4份胶乳的涂布白纸板的白度 (亮度) 和 CIE白度分别为 86.0%和 96.4%, 与涂布在底涂涂料中不含淀粉的涂布白纸板 (白度为 81.9%、 CIE白度为 85.3%) 比较, 底涂中用 6份淀粉取代 4份胶乳使涂布白纸板的白度 提高了 4.1个单位, CIE白度提高了 10.1个单位, 见表 3。
实施例 5:
一种用淀粉提高涂布纸或涂布纸板白度的方法, 本实施例涉及利用淀粉提高 OBA增 白效率的方法在较低成本下生产高档涂布纸。
(1)配抄涂布原纸, 其浆料组成及配比为:
碱性过氧化氢机械浆(APMP): 30%, 白度 69%; 漂白针叶木化学浆(NBKP): 30%, 白度 88%; 漂白阔叶木化学浆 (LBKP): 40%, 白度 85%;
所抄造的原纸定量为 100±2g/m2, 白度为 74%。
(2)借助涂布装置实施底涂, 双面涂布, 每面涂布量为 9~12g/m2。 底涂涂料中含有 10 份淀粉。 涂料固含量约 60%, pH在 8.5左右, 该底涂涂料配方如下:
重质碳酸钙(55级): 70份; 高岭土(90%以上小于 2微米): 30份; 丁苯胶乳: 8份; 淀粉: 10份; 抗水剂 (聚酰胺聚脲): 0.5份; 金红石型二氧化钛 (微米级), 5份, 其他辅料: 分散剂, 0.2份; 消泡剂 0.03份; 润滑剂 0.5份。
(3)借助涂布装置实施面涂, 双面涂布, 每面涂布量为 ll~14g/m2。 面涂涂料中含有 1 份 OBA和 1份 PVA作为 OBA载体。 涂料固含量约 60%, pH在 8.5左右。 该面涂涂料配 方如下:
重质碳酸钙 (98级): 80份; 细粒高岭土 (92%小于 2微米), 20份; 丁苯胶乳: 15 份; 荧光增白剂: 1份, 四磺酸型液体增白剂; 聚乙烯醇: 1份, 聚合度 300~500;
其他辅料: 分散剂 0.2份、 消泡剂 0.03份、 润滑剂 0.3份、 抗水剂 0.5份。
(4)原纸的两面经过两次涂布后得到了白度约为 91%的高白度涂布纸, 满足国家标准 (GB/T 10335. 1-2005) 对优质铜版纸白度 (白度不低于 86% ) 的要求。 应该指出, 造纸 厂生产铜版纸一般采用白度与铜版纸接近的涂布原纸 (白度约在 85%左右), 本发明使用 的原纸白度仅为 74%, 大大降低了生产高白度涂布纸对原纸白度的要求, 生产成本较低。 表 -1 : 底涂涂料中淀粉含量和面涂涂料中 0BA及其载体 (PVA) 含量对涂布再生箱纸板白 度的影响 (总涂布量约 27 ± 3 g/m2, 见例 1和例 2)。
Figure imgf000008_0001
表 2: 淀粉取代胶乳对涂布牛皮卡纸白度的影响 (原纸白度 20.5%, 见例 3) 底涂涂料中淀粉与胶乳含量 0份淀粉 6份淀粉
12份胶乳 8份胶乳
面涂涂料中 OBA与 CMC含量 0.8份 OBA 0.8份 OBA
0.8份 CMC 0.8份 CMC
涂布牛皮卡纸白度 (¾> ) 78.6 81.2
涂布牛皮卡纸 CIE白度 (<¾) 85.4 92.5 表 3: 淀粉取代胶乳对涂布白纸板白度的影响 (原纸白度 73.5%, 见例 4)
Figure imgf000009_0001
应该说明的是: 在公开发表的文献中, 由于淀粉的粘合能力稍弱于胶乳, 一般以 1.3-2份的淀粉取代 1份胶乳,本专利实施例中经常以 1.5份淀粉取代 1份胶乳。但是, 因为淀粉的售价大大低于石化产品合成胶乳, 使用 1.5-2份淀粉取代 1份胶乳作为涂 布纸涂料的胶粘剂仍然有利于降低造纸的原料成本。 为了避免淀粉对涂布纸或涂布纸 板光泽度的负面影响, 本专利没有给出在面涂涂料中使用淀粉的实施例。

Claims

权利要求书
1、 一种用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方法, 其特征在于: 底涂涂料中的淀粉含量为底涂涂层总重量的 3-20%, 面涂涂料中含有为面涂涂层总重 量的 0.1-2.0%的荧光增白剂。
2、 根据权利要求 1 所述的用淀粉提高涂布纸和涂布纸板中荧光增白剂效率的方 法, 其特征在于: 所述底涂涂料中的淀粉含量为底涂涂层总重量的 5-15%。
3、 根据权利要求 1 所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方 法, 其特征在于: 所述面涂涂料中的荧光增白剂含量为面涂涂层总重量的 0.3-1.5%。
4、 根据权利要求 1 所述的用淀粉提高涂布纸和涂布纸板中荧光增白剂效率的方 法, 其特征在于: 所述底涂涂料的包括: 淀粉: 3-20份、 胶乳 0-20份、 碳酸钙: 10-90 份、 高岭土: 10-80份、 钛白粉: 0-10份。
5、 根据权利要求 1 所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方 法,其特征在于:所述面涂涂料的包括:荧光增白剂: 0.3-2.0份、荧光增白剂载体 0-1.5 份、 胶乳 8-20份、 碳酸钙: 10-90份、 高岭土: 10-80份。
6、 根据权利要求 1 所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方 法,其特征在于:还包括中层涂料, 中涂涂料的组成为:淀粉: 5-20份、抗水剂: 0.2-2.0 份、 胶乳 0-20份、 碳酸钙: 10-90份、 高岭土: 10-80份。 单面中涂涂层的涂布量为 0-12 g/m2, 单面三层涂布的涂布总量不大于 45 g/m2
7、 根据权利要求 4、 5或 6所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效 率的方法, 其特征在于: 还包括造纸用涂料助剂。
8、 根据权利要求 7 所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方 法, 其特征在于: 所述助剂包括分散剂、 消泡剂、 润滑剂、 保水剂、 杀菌剂、 交联剂、 抗水剂、 增稠剂, 增韧剂。
9、 根据权利要求 1 所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方 法, 其特征在于: 所述底涂涂料的单面涂布量为 6-20 g/m2, 所述面涂涂层的单面涂布 量为 6-20 g/m2
10、 根据权利要求 9所述的用淀粉提高涂布纸或涂布纸板中荧光增白剂效率的方 法,其特征在于:底涂涂料、中层涂料、面涂涂料的单面涂布的总涂布量为 15-45 g/m
PCT/CN2011/076005 2011-05-17 2011-06-21 用淀粉提高涂布纸或涂布纸板白度的方法 WO2012155380A1 (zh)

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