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Flame retardant multi-layer label

A flame-retardant layer and label technology, applied in the field of halogen-free flame-retardant multi-layer labels, can solve the problems of inability to use, generate smoke and toxic substances, and cannot meet halogen-free requirements, and achieve good printability and excellent flame retardant performance. Effect

Inactive Publication Date: 2011-07-20
BRADY WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Halogen-based flame retardants can provide superior flame retardancy and can be used to meet the requirements of UL94 VTM-0, but they produce smoke and toxic substances during combustion, so they cannot be used in some occasions
[0004] For example, UL94 VTM-0 labels containing halogen flame retardants (such as 3M7203 and 3M7204 of 3M Company and K05013F of SKC Company) are commercially available, but cannot meet the halogen-free requirements, such as the International Electrotechnical Commission (International ElectrotechnicalCommission, IEC) The standard 61249-2-21, which requires chlorine to be less than 900ppm, bromine to be less than 900ppm, and the total of chlorine and bromine to be less than 1500ppm

Method used

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  • Flame retardant multi-layer label

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The preparation of the label of structure shown in Fig. 1: the top coating solution roll-coating (roll-coating) is on the first surface of base film, then is dried at 150 ℃ for 2 minutes to form top coating on the first surface of base film layer.

[0087] According to the method described above, 12 labels were obtained with 6 base films and two topcoat solutions (topcoat solutions 1 and 2). The six base films are PI, PEI, FR-PC, FR-PET, A1 and PVF. Topcoat solutions 1 and 2 were prepared according to the following method. Topcoat solution 1 was used to form a topcoat without a flame retardant (Non-FR topcoat), and topcoat solution 2 was used to form a topcoat with a flame retardant (FR topcoat).

[0088] Preparation of top coat solution 1: in a high shear mixer (Cowles TM ), 40 g of phenoxy resin (Inchem PKHH) and 60 g of polyurethane resin (Lubrizol Estane 5703) were dissolved in 450 ml of cyclohexanone at room temperature, 80 g of titanium dioxide (Dupont Ti-PureR...

Embodiment 2

[0095]The preparation of the label of the structure shown in Figure 2: roll-coat the top coat solution on the first surface of the base film, dry at 150°C for 2 minutes to form a top coat on the first surface of the base film, and then apply the adhesive The agent layer solution was roll-coated on the second surface of the base film, and dried at 90° C. for 4 minutes to form an adhesive layer on the second surface of the base film.

[0096] According to the above method, with 6 kinds of base films and two kinds of topcoat solutions 1 and 2 described in Example 1 and an acrylic adhesive for forming a non-flame retardant adhesive layer (non-FR adhesive layer) (National Starch, Durotak 180-129A) received 12 labels. The obtained labels were tested according to the UL94VTM-0 standard, and the results are shown in Table 2.

[0097] Table 2: Flame Retardancy Properties of Labels with Adhesive Layers Without Flame Retardant

[0098]

[0099] From Table 1 and Table 2, it can be se...

Embodiment 3

[0101] Using the same materials and methods as described in Example 2, a typical topcoat thickness (18 microns), flame retardant-free adhesive layer thickness (20 microns) and varying PI base film thicknesses were prepared accordingly. Label. The flame retardant properties of the obtained labels are shown in Table 3.

[0102] Table 3: Effect of base film thickness on flame retardant properties

[0103] PI thickness (micron)

[0104] It can be seen from Table 3 that for the PI base film, the thicker the base film, the better the flame retardancy. Typically, the base film thickness can be between 12 and 125 microns. Films that are too thin may be prone to breaking under tension and curling due to electrostatic attraction. Meanwhile, a film that is too thick is difficult to wind the battery and has cost problems. This thickness is preferred since PI with a thickness of 25 μm has higher mechanical stability than thinner ones and better adaptability to wound batteries...

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Abstract

The present invention relates to a multi-layer label, including: a backing film having a first surface and a second surface, and a topcoat layer containing a polymeric matrix and a flame retardant and having a first surface and a second surface, the second surface of the topcoat in intimate contact with the first surface of the backing film, in which the label as a whole is in compliance with UL94 VTM-0 standard and comprises less than 900ppm of chlorine, less than 900ppm of bromine, and less than 1500ppm of chlorine and bromine in combination. The multi-layer label may further include a flame retardant layer containing a binder and a flame retardant, and / or an adhesive layer optionally containing a flame retardant. The multi-layer label is useful in electronic products and mass transportation.

Description

technical field [0001] The invention relates to a multi-layer label, especially a flame-retardant multi-layer label, more particularly a halogen-free flame-retardant multi-layer label, especially a halogen-free flame-retardant multi-layer label with good printability that can be used as an identification label. Background technique [0002] Flame retardant labels are used in many applications where flame retardancy is required such as cables, printed circuit boards (PCB) or printed wiring boards (PWB) and batteries as well as in-line barcoding and other labeling systems for improved process inventory and quality control . [0003] UL94 VTM-0 is the most stringent test standard for flame retardancy of thin plastic materials issued by UL (Underwriters Laboratories Inc.). Halogen-based flame retardants can provide superior flame retardancy and can be used to meet the requirements of UL94 VTM-0, but they generate smoke and toxic substances during combustion and thus cannot be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/18G09F3/02
CPCG09F3/08B32B15/08B32B27/08B32B2519/00B32B2307/3065G09F2003/0257Y10T428/265Y10T428/2848Y10T428/266G09F3/02G09F3/10B32B7/12B32B27/18
Inventor 王礼强何敏林建
Owner BRADY WORLDWIDE INC
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