WO2020133327A1 - 一种锂电池铝塑膜用的外保护涂料及其制备方法 - Google Patents

一种锂电池铝塑膜用的外保护涂料及其制备方法 Download PDF

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WO2020133327A1
WO2020133327A1 PCT/CN2018/125276 CN2018125276W WO2020133327A1 WO 2020133327 A1 WO2020133327 A1 WO 2020133327A1 CN 2018125276 W CN2018125276 W CN 2018125276W WO 2020133327 A1 WO2020133327 A1 WO 2020133327A1
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protective coating
plastic film
parts
lithium battery
aluminum
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PCT/CN2018/125276
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French (fr)
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丁新
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江西明冠锂膜技术有限公司
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate

Definitions

  • the invention relates to the technical field of aluminum battery plastic films for lithium batteries, in particular to an external protective coating for aluminum battery plastic films of lithium batteries and a preparation method thereof.
  • Lithium-ion battery is a new type of battery with many obvious advantages such as high energy density, more compact, ultra-thin, lightweight, and high safety; in its shape, it can be made in any shape and capacity In terms of safety, when the liquid is just boiling, the battery will naturally swell but will not explode; this is due to the aluminum-plastic film on its packaging shell; the flexible packaging aluminum-plastic film is used as a polymer battery outer packaging film , In the polymer lithium ion battery, it plays an important role in protecting the battery from damage and preventing liquid leakage in the battery.
  • the outermost layer of the battery aluminum-plastic film is susceptible to irresistible external forces, resulting in nylon The layer is damaged, which brings potential safety hazards to the use of the entire battery.
  • a layer of solvent-resistant and wear-resistant film material on the surface of the outer layer film such as PET
  • the other method is to apply a layer of solvent-resistant layer to the surface for treatment; These two methods have different degrees of defects.
  • the PET material limits the performance of the aluminum battery plastic film due to its stretch rate; in addition, the coating of the solvent-resistant layer has solvent-resistant wipes due to its composition, and particles Defects such as uneven diameter and coating appearance stripes.
  • the object of the present invention is to provide an outer protective coating for an aluminum-plastic film of a lithium battery with good coating appearance, excellent solvent resistance and friction resistance, and a preparation method thereof.
  • An external protective coating for an aluminum plastic film of a lithium battery includes the following parts by weight of raw materials:
  • the inorganic filler is at least one of kaolin, calcium carbonate, silica, and aluminum hydroxide.
  • the outer protective coating is composed of the following parts by weight of raw materials:
  • the weight ratio of the polyester polyol to TDI is 5-7:1.
  • the organic solvent is at least one of ethyl acetate, methyl ethyl ketone and toluene, preferably ethyl acetate.
  • the dispersant is gum arabic.
  • the inorganic filler is composed of 1-2 parts kaolin, 2-5 parts calcium carbonate, 2-5 parts silica and 3-5 parts aluminum hydroxide according to parts by weight.
  • the inorganic filler compounded in the present invention has good dispersibility in the coating, can stably exist in the coating, and improve the solvent resistance and friction resistance of the coating.
  • the inorganic filler is a nano-inorganic filler with a particle size of 20-40 nm.
  • the present invention can also The filler is coated and modified, including the following steps:
  • the nano-inorganic filler Compared with the polyurethane system of the protective coating, the nano-inorganic filler has better dispersion in the castor oil polyurethane prepolymer solution. Therefore, in the present invention, the nano-inorganic filler is coated with castor oil-based polyurethane.
  • the nano-inorganic filler can Uniformly dispersed in castor oil-based polyurethane particles, and because the castor oil-based polyurethane and polyurethane resin have the same nature and good compatibility, it can improve the dispersion of nano-inorganic fillers in the coating; Furthermore, the invention is prepared
  • the castor oil polyurethane also has good corrosion resistance, so it can improve the corrosion resistance of the coating; in addition, the castor oil polyurethane also has good toughness, which can improve the toughness of the coating through the elastomer toughening mechanism, and castor oil Nano-inorganic fillers in polyurethane can also synergistically improve the toughness of the coating through the rigid particle toughening mechanism.
  • the chain extender is composed of 1,4-butanediol and triisopropanolamine in a weight ratio of 1-2:1.
  • the chain extender selected in the present invention can adjust the molecular weight of the castor oil polyurethane prepolymer , Promote a certain degree of cross-linking reaction between nano-inorganic filler and castor oil polyurethane, improve the suspension stability of nano-inorganic filler, and help maintain the high dispersion of nano-inorganic filler in electrostatic spray.
  • a method for preparing an external protective coating for an aluminum plastic film of a lithium battery includes the following steps:
  • the beneficial effect of the present invention is that: by adding an inorganic filler to the outer protective coating, the invention has good chemical corrosion resistance, and adding a dispersant can uniformly disperse the inorganic filler in the coating, and the formed coating has strong barrier property and can be very good To avoid corrosion of aluminum plastic film, and has excellent friction resistance.
  • An external protective coating for an aluminum plastic film of a lithium battery includes the following parts by weight of raw materials:
  • the organic solvent is ethyl acetate.
  • the dispersant is gum arabic.
  • a method for preparing an external protective coating for an aluminum plastic film of a lithium battery includes the following steps:
  • An external protective coating for an aluminum plastic film of a lithium battery includes the following parts by weight of raw materials:
  • the organic solvent is toluene.
  • the dispersant is gum arabic.
  • a method for preparing an external protective coating for an aluminum plastic film of a lithium battery includes the following steps:
  • An external protective coating for an aluminum plastic film of a lithium battery includes the following parts by weight of raw materials:
  • the organic solvent is butanone.
  • the dispersant is gum arabic.
  • a method for preparing an external protective coating for an aluminum plastic film of a lithium battery includes the following steps:
  • the inorganic filler is a nano-inorganic filler with a particle size of 60 nm.
  • the nano-inorganic filler is coated and modified, and specifically includes the following steps:
  • the chain extender is composed of 1,4-butanediol and triisopropanolamine in a weight ratio of 1-2:1.
  • a method for preparing an external protective coating for an aluminum plastic film of a lithium battery includes the following steps:
  • the inorganic filler is a nano-inorganic filler with a particle size of 40 nm.
  • the nano-inorganic filler is further coated and modified, and specifically includes the following steps:
  • the chain extender is composed of 1,4-butanediol and triisopropanolamine in a weight ratio of 1:1.
  • a method for preparing an external protective coating for an aluminum plastic film of a lithium battery includes the following steps:
  • the chain extender is 1,4-butanediol.
  • Example 1-6 The coatings of Examples 1-6 were made into coatings, and the abrasion resistance was carried out according to GB/T1768-1979, GB/T1720-1979, GB/T1731-1993 and GB/T1771-2007 (H-18 wheel, 1Kg/ 1000r), adhesion, flexibility and salt spray resistance test, the test results are shown in the table below:
  • Example 1 A Wear resistance (mg) Adhesion (level) Flexibility (mm) Salt spray resistance (days)
  • Example 1 283 0 2 14
  • Example 2 304 0 2 10
  • Example 3 308 0 2 11
  • Example 4 261 0 1 18
  • Example 5 272 0 1 16
  • Example 6 275 0 1 16
  • the coating of the present invention has good wear resistance, adhesion, flexibility and salt spray resistance after being made into a coating, and is particularly suitable for use as a protective coating for aluminum-plastic films; It can be seen from the comparison between Example 1 and Example 4 that after adopting nano-inorganic filler and coating and modifying the nano-inorganic filler, the properties of the coating have been significantly improved; from the comparison between Example 4 and Example 6, it can be seen that According to the invention, the compounded chain extender can improve the overall performance of the coating.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Separators (AREA)

Abstract

一种锂电池铝塑膜用的外保护涂料及其制备方法，外保护涂料包括100-200份聚酯多元醇、20-30份TDI、200-250份有机溶剂、8-17份无机填料和1-5份分散剂，所述无机填料为高岭土、碳酸钙、二氧化硅和氢氧化铝中的至少一种。通过在外保护涂料中加入无机填料，耐化学腐蚀性能好，加入分散剂，能够将无机填料均匀地分散于涂料中，形成的涂层阻隔性强，能够很好地避免铝塑膜被腐蚀，并且具有优良的耐摩擦性能。

Description

一种锂电池铝塑膜用的外保护涂料及其制备方法 技术领域
本发明涉及锂电池铝塑膜技术领域，具体涉及一种锂电池铝塑膜用的外保护涂料及其制备方法。
背景技术
锂离子电池的是一种具有能量密度高、更小型化、超薄化、轻量化，以及高安全性等多种明显优势，是一种新型电池；在其形状上，可以制作任何形状与容量的电池，在其安全性上，当液体刚沸腾时，电池会自然鼓包但不会爆炸；这得益于其包装外壳上的铝塑膜；软包装铝塑膜作为一种聚合物电池外包装膜，在聚合物锂离子电池中起着保护电池不受损伤及防止电池中液体泄漏等重要功能，在电池生产过程及使用过程中，电池铝塑膜最外层易受到不可抗拒外力因素，导致尼龙层受损伤，对整个电池的使用带来安全隐患。目前通用方法有两种，一种是在其外层膜表面复合一层耐溶剂、耐磨的膜材，例如PET等，另一种方法是对其表面涂布一层耐溶剂层进行处理；这两种方法都存在不同程度缺陷，首先PET材料因其拉伸率等原因，限制了锂电池铝塑膜性能；另外，涂布耐溶剂层因其成分原因，存在不耐溶剂擦拭，颗粒粒径不均匀、涂布外观条纹等不良。
发明内容
为了克服现有技术中存在的缺点和不足，本发明的目的在于提供一种涂布外观良好，且耐溶剂及耐摩擦性能优良的锂电池铝塑膜用的外保护涂料及其制备方法。
本发明的目的通过下述技术方案实现：
一种锂电池铝塑膜用的外保护涂料，包括如下重量份的原料：
Figure PCTCN2018125276-appb-000001
Figure PCTCN2018125276-appb-000002
所述无机填料为高岭土、碳酸钙、二氧化硅和氢氧化铝中的至少一种。
优选地，所述外保护涂料由如下重量份数的原料组成：
Figure PCTCN2018125276-appb-000003
其中，所述聚酯多元醇与TDI的重量比为5-7:1。
其中，所述有机溶剂为乙酸乙酯、丁酮和甲苯中的至少一种，优选为乙酸乙酯。
其中，所述分散剂为阿拉伯树胶。
其中，所述无机填料按重量份由1-2份高岭土、2-5份碳酸钙、2-5份二氧化硅和3-5份氢氧化铝组成。
本发明复配选用的无机填料在涂料中分散性好，可以稳定存在于涂层中，提高涂层的耐溶剂性和耐摩擦性。
优选地，所述无机填料为纳米无机填料，粒径为20-40nm，为了使纳米无机填料在体系中具有更好的分散性，提高保护涂层的各项性能，本发明还可以对纳米无机填料进行包覆改性处理，具体包括如下步骤：
A、取40-50重量份的蓖麻油、8-16重量份的甘油和0.1-0.3重量份的三乙醇胺进行混合，升温至200-220℃进行醇解反应2-3h，冷却，得到醇解蓖麻油；
B、取100重量份的N，N-二甲基乙酰胺，往所述N，N-二甲基乙酰胺加入所述醇解蓖麻油和60-80重量份的4，4-二苯基甲烷二异氰酸酯，升温至55-65℃反应1.5-2.5h，冷却，得到蓖麻油基聚氨酯预聚体溶液；
C、往所述蓖麻油基聚氨酯预聚体溶液加入4-10重量份的扩链剂和所述8-17重量份的无机填料，在40-50℃的温度下反应1-1.5h，得到混合物溶液；
D、将所述混合物溶液进行静电喷雾，即得到包覆改性处理后的纳米无机天填料。
相对于保护涂料的聚氨酯体系，纳米无机填料在该蓖麻油聚氨酯预聚体溶液中具有更好的分散性，因而本发明通过以蓖麻油基聚氨酯对纳米无机填料进行包覆处理，纳米无机填料可以均匀分散于蓖麻油基聚氨酯颗粒中，而因为蓖麻油基聚氨酯与聚氨酯树脂具有同源的性质，相容性较好，因而可以提高纳米无机填料在涂料的分散性；再者，本发明制得的蓖麻油聚氨酯也具有良好的耐腐蚀性，因而可以提高涂层的耐腐蚀性；此外，蓖麻油聚氨酯还具有较好的韧性，可以通过弹性体增韧机理提高涂层的韧性，而且蓖麻油聚氨酯中的纳米无机填料也可以通过刚性粒子增韧机理协同提高涂层的韧性。
进一步地，所述扩链剂由1，4一丁二醇和三异丙醇胺按重量比1-2:1的比例组成，本发明选用的扩链剂可以调整蓖麻油聚氨酯预聚体的分子量，促进纳米无机填料与蓖麻油聚氨酯发生一定程度的交联反应，提升纳米无机填料的悬浮稳定性，利于静电喷雾中保持纳米无机填料的高度分散性。
如上所述的一种锂电池铝塑膜用的外保护涂料的制备方法，包括如下步骤：
(1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
(2)往所述混合液体中加入无机填料和分散剂，搅拌分散后，得到分散溶液；
(3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
本发明的有益效果在于：本发明通过在外保护涂料中加入无机填料，耐化学腐蚀性能好，加入分散剂，能够将无机填料均匀地分散于涂料中，形成的涂层阻隔性强，能够很好地避免铝塑膜被腐蚀，并且具有优良的耐摩擦性能。
具体实施方式
为了便于本领域技术人员的理解，下面结合实施例对本发明作进一步的说明，实施方式提及的内容并非对本发明的限定。
实施例1
一种锂电池铝塑膜用的外保护涂料，包括如下重量份的原料：
Figure PCTCN2018125276-appb-000004
其中，所述有机溶剂为乙酸乙酯。
其中，所述分散剂为阿拉伯树胶。
如上所述的一种锂电池铝塑膜用的外保护涂料的制备方法，包括如下步骤：
(1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
(2)往所述混合液体中加入无机填料和分散剂，搅拌分散后，得到分散溶液；
(3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
实施例2
一种锂电池铝塑膜用的外保护涂料，包括如下重量份的原料：
Figure PCTCN2018125276-appb-000005
其中，所述有机溶剂为甲苯。
其中，所述分散剂为阿拉伯树胶。
如上所述的一种锂电池铝塑膜用的外保护涂料的制备方法，包括如下步骤：
(1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
(2)往所述混合液体中加入无机填料和分散剂，搅拌分散后，得到分散溶液；
(3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
实施例3
一种锂电池铝塑膜用的外保护涂料，包括如下重量份的原料：
Figure PCTCN2018125276-appb-000006
其中，所述有机溶剂为丁酮。
其中，所述分散剂为阿拉伯树胶。
如上所述的一种锂电池铝塑膜用的外保护涂料的制备方法，包括如下步骤：
(1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
(2)往所述混合液体中加入无机填料和分散剂，搅拌分散后，得到分散溶液；
(3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
实施例4
本实施例与实施例1的区别在于：
所述无机填料为纳米无机填料，粒径为60nm，本实施例对纳米无机填料进行包覆改性处理，具体包括如下步骤：
A、取45重量份的蓖麻油、12重量份的甘油和0.2重量份的三乙醇胺进行混合，升温至210℃进行醇解反应2.5h，冷却，得到醇解蓖麻油；
B、取100重量份的N，N-二甲基乙酰胺，往所述N，N-二甲基乙酰胺加入所述醇解蓖麻油和70重量份的4，4-二苯基甲烷二异氰酸酯，升温至60℃反应2h，冷却，得到蓖麻油基聚氨酯预聚体溶液；
C、往所述蓖麻油基聚氨酯预聚体溶液加入7重量份的扩链剂和所述12.5重量份的无机填料，在45℃的温度下反应1.2h，得到混合物溶液；
D、将所述混合物溶液进行静电喷雾，即得到包覆改性处理后的纳米无机天填料。
进一步地，所述扩链剂由1，4一丁二醇和三异丙醇胺按重量比1-2:1的比例组成。
如上所述的一种锂电池铝塑膜用的外保护涂料的制备方法，包括如下步骤：
(1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
(2)往所述混合液体中加入包覆改性处理后的纳米无机天填料和分散剂，搅拌分散后，得到分散溶液；
(3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
实施例5
本实施例与实施例1的区别在于：
优选地，所述无机填料为纳米无机填料，粒径为40nm，本实施例还对纳米无机填料进行包覆改性处理，具体包括如下步骤：
A、取40重量份的蓖麻油、8重量份的甘油和0.1重量份的三乙醇胺进行混合，升温至200℃进行醇解反应2h，冷却，得到醇解蓖麻油；
B、取100重量份的N，N-二甲基乙酰胺，往所述N，N-二甲基乙酰胺加入所述醇解蓖麻油和60重量份的4，4-二苯基甲烷二异氰酸酯，升温至55℃反应1.5h，冷却，得到蓖麻油基聚氨酯预聚体溶液；
C、往所述蓖麻油基聚氨酯预聚体溶液加入4重量份的扩链剂和所述12.5重量份的无机填料，在40℃的温度下反应1.5h，得到混合物溶液；
D、将所述混合物溶液进行静电喷雾，即得到包覆改性处理后的纳米无机天填料。
进一步地，所述扩链剂由1，4一丁二醇和三异丙醇胺按重量比1:1的比例组成。
如上所述的一种锂电池铝塑膜用的外保护涂料的制备方法，包括如下步骤：
(1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
(2)往所述混合液体中加入包覆改性处理后的纳米无机天填料和分散剂，搅拌分散后，得到分散溶液；
(3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
实施例6
本实施例与实施例4的区别在于：
所述扩链剂为1，4一丁二醇。
将实施例1-6的涂料制成涂层，按照GB/T1768-1979、GB/T1720-1979、GB/T1731-1993和GB/T 1771-2007进行耐磨性(H-18轮，1Kg/1000r)、附着力、柔韧性和耐盐雾测试，测试结果见下表：
  耐磨性(mg) 附着力(级) 柔韧性(mm) 耐盐雾性(天)
实施例1 283 0 2 14
实施例2 304 0 2 10
实施例3 308 0 2 11
实施例4 261 0 1 18
实施例5 272 0 1 16
实施例6 275 0 1 16
从实施例1的数据可知，本发明的涂料制成涂层后，具有良好的耐磨性、附着性、柔韧性和耐盐雾性，尤其适用于作为铝塑膜的保护涂层；从实施例1和实施例4对比可知，采用纳米无机填料并对纳米无机填料进行包覆改性后，涂层的各项性能均有显著的提升；从实施例4和实施例6的对比可知，本发明优选复配的扩链剂可以提升涂层的综合性能。
上述实施例为本发明较佳的实现方案，除此之外，本发明还可以其它方式实现，在不脱离本发明构思的前提下任何显而易见的替换均在本发明的保护范围之内。

Claims (8)

  1. 一种锂电池铝塑膜用的外保护涂料，其特征在于：包括如下重量份的原料：
    Figure PCTCN2018125276-appb-100001
    所述无机填料为高岭土、碳酸钙、二氧化硅和氢氧化铝中的至少一种。
  2. 根据权利要求1所述的一种锂电池铝塑膜用的外保护涂料，其特征在于：所述无机填料按重量份由1-2份高岭土、2-5份碳酸钙、2-5份二氧化硅和3-5份氢氧化铝组成。
  3. 根据权利要求2所述的一种锂电池铝塑膜用的外保护涂料，其特征在于：由如下重量份数的原料组成：
    Figure PCTCN2018125276-appb-100002
  4. 根据权利要求1所述的一种锂电池铝塑膜用的外保护涂料，其特征在于：所述聚酯多元醇与TDI的重量比为5-7:1。
  5. 根据权利要求1所述的一种锂电池铝塑膜用的外保护涂料，其特征在于：所述有机溶剂为乙酸乙酯、丁酮和甲苯中的至少一种。
  6. 根据权利要求5所述的一种锂电池铝塑膜用的外保护涂料，其特征在于：所述有机溶剂为乙酸乙酯。
  7. 根据权利要求1所述的一种锂电池铝塑膜用的外保护涂料，其特征在于：所述分散剂为阿拉伯树胶。
  8. 权利要求1-7任意所述的一种锂电池铝塑膜用的外保护涂料的制备方法，其特征在于：包括如下步骤：
    (1)按重量份数取聚酯多元醇和有机溶剂进行混合，得到混合液体；
    (2)往所述混合液体中加入无机填料和分散剂，搅拌分散后，得到分散溶液；
    (3)往所述分散溶液加入TDI，搅拌混合，即得到所述的锂电池铝塑膜用的外保护涂料。
PCT/CN2018/125276 2018-12-24 2018-12-29 一种锂电池铝塑膜用的外保护涂料及其制备方法 WO2020133327A1 (zh)

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