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Preparation method of hot melt adhesive film for vehicle flexible flat cable (FFC) wire and hot melt adhesive film

A technology of hot-melt adhesive film and hot-melt adhesive, which is applied in the direction of film/sheet release coating, adhesive, film/sheet adhesive, etc., which can solve poor weather resistance, conductor fracture, conductor and connector insulation, etc. question

Active Publication Date: 2019-03-29
广东莱尔新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The adhesion to the PET polyester film is not enough, and the problem of delamination between the hot melt adhesive and the PET polyester film is prone to occur. Even if there is a primer, the primer and the hot melt adhesive are also prone to cracking;
[0005] 2. Insufficient cohesion. Hot melt adhesive is a thermoplastic crosslinking agent with a low degree of crosslinking. It is easy to crack the hot melt adhesive when it is applied to FFC wires for vehicles with motion;
[0006] 3. The strength of the adhesive conductor is greatly affected by the temperature. Under the test conditions of room temperature, the existing hot melt adhesive film, for the conventional 0.035mm*0.3mm (thickness*width) conductor, the adhesive force is below 50g, which belongs to thermoplastic bonding; Under high temperature (>50°C) and low temperature (<-10°C) conditions, the peeling force of the hot-melt adhesive film drops sharply, which is prone to problems such as detachment of the conductor from the hot-melt adhesive film and conductor breakage, and it is difficult to meet the requirements of the vehicle-mounted belt. Requirements for using FFC lines;
[0007] 4. Poor weather resistance, low crosslinking degree of hot melt adhesive film, high hygroscopicity of hot melt adhesive layer, easy degradation of saturated polyester, resulting in blistering and delamination between PET polyester film and hot melt adhesive;
[0008] 5. The performance of anti-spill glue is poor. The conventional thermoplastic hot-melt adhesive film is affected by the temperature, and the hot-melt adhesive will gradually sink, causing the hot-melt glue to overflow to the surface of the conductor, resulting in insulation between the conductor and the connector

Method used

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  • Preparation method of hot melt adhesive film for vehicle flexible flat cable (FFC) wire and hot melt adhesive film
  • Preparation method of hot melt adhesive film for vehicle flexible flat cable (FFC) wire and hot melt adhesive film
  • Preparation method of hot melt adhesive film for vehicle flexible flat cable (FFC) wire and hot melt adhesive film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11

[0046]Embodiment 1~11 prepares primer according to the following steps:

[0047] Step A1, according to the mass parts in Table 1, add medium molecular weight saturated polyester and butanone-toluene solvent into the reaction kettle and stir to dissolve, the stirring speed is 500-1000r / min; the molecular weight of medium molecular weight saturated polyester is 4000, glass The melting temperature is -30°C;

[0048] In step A2, the reaction kettle in step A1 is stirred and dissolved evenly and then lowered to room temperature, and then according to the parts by mass in Table 1, add an anti-blocking agent and a low-temperature blocked isocyanate curing agent, and stir and disperse evenly;

[0049] In step A3, according to the mass parts in Table 1, add an isocyanate curing agent into the reaction kettle in step A2 before coating, and stir and disperse evenly to prepare a primer.

Embodiment 1～12

[0050] Embodiment 1~12 prepares hot-melt adhesive according to the following steps:

[0051] Step B1, according to the mass parts, add 35 parts of high molecular weight saturated polyester a, 10 parts of high molecular weight saturated polyester b and 50 parts of toluene solvent into another reaction kettle, heat up to 70 ° C, stir and dissolve, and the stirring speed is 800r / min; high molecular weight saturated polyester a has a molecular weight of 30,000 and a glass transition temperature of 10°C; high molecular weight saturated polyester b has a molecular weight of 20,000 and a glass transition temperature of 80°C;

[0052] Step B2, after stirring and dissolving the reactor in step B1, add 5 parts of epoxy resin according to the mass parts, and stir and dissolve evenly;

[0053] Step B3, according to the mass parts, add 30 parts of flame retardant, 2 parts of anti-blocking agent and 1 part of titanium dioxide to the reaction kettle in step B2, and then stir and disperse eve...

Embodiment 12

[0058] Embodiment 12 prepares a hot melt adhesive film according to the following steps:

[0059] On the PET polyester film 1 with a thickness of 25 μm, a hot melt adhesive with a thickness of 35 μm was coated to obtain a hot melt adhesive film. The width of the hot-melt adhesive film sample is 25.4mm, the hot-melt adhesive surface is heat-sealed with the adhesive surface, the heat-sealing pressure is 0.5Mpa, the time is 1 second, the temperature is 180°C, and after heat-sealing, it is 120°C and matured for 1 hour.

[0060] The hot-melt adhesive film sample that embodiment 1~12 makes tests the peeling strength of primer to hot-melt adhesive and PET polyester film 1 at different temperatures;

[0061] Place the hot-melt adhesive film samples prepared in Examples 1 to 12 for 1000 hours at a temperature of 85°C and a humidity of 85°C, and then test the peel strength;

[0062] The anti-yellowing properties of the hot melt adhesive film samples prepared in Examples 1-12 were teste...

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Abstract

The invention discloses a preparation method of a hot melt adhesive film for a vehicle flexible flat cable (FFC) wire and the hot melt adhesive film. The preparation method comprises the following steps: A, preparing a primer coating agent: step A1, adding 20-40 parts by mass of medium-molecular-weight saturated polyester and 60-80 parts by mass of a butanone-toluene solvent into a reaction kettle, and carrying out dissolving by stirring, wherein the stirring speed is 500-1000 r / min; and step A2, after the mixture in the reaction kettle in the step A1 is uniformly dissolved by stirring, carrying out cooling to the room temperature, then adding 0.1-5 parts by mass of an anti-adhesion agent and 0.5-20 part by mass of a low-temperature closed isocyanate curing agent, and uniformly carrying out dispersing by stirring. The low-temperature closed isocyanate curing agent is added into the primer coating agent, so that chemical cross-linking of the primer coating agent to a polyethylene terephthalate PET polyester film and a hot melt adhesive is increased, and the adhesive force of the primer coating agent to the PET polyester film and the hot melt adhesive under a high-temperature condition and a low-temperature condition is improved. A closed type latent curing agent is adopted in the hot melt adhesive, so that the cross-linking degree and cohesion of the hot melt adhesive are increased, heat resistance and hydrolysis resistance are improved, cracking of the hot melt adhesive is avoided, and blistering and layering between the PET polyester film and the hot melt adhesive are avoided.

Description

technical field [0001] The invention relates to the field of film manufacturing, in particular to a method for preparing a hot-melt adhesive film for an automotive FFC wire and the hot-melt adhesive film. Background technique [0002] FFC cable, also known as Fexibe Flat Cable (FFC), is a flexible flat cable. It is a new type of data cable made of tinned flat copper wires sandwiched between upper and lower layers of insulating materials. It is soft and flexible. Advantages such as bending and folding. In the existing FFC cable, the hot-melt bonding of the insulating material and the tinned flat copper wire is realized through a hot-melt adhesive film. [0003] FFC wires for vehicles are applied to the moving parts of the vehicle in the engine compartment, and the FFC cable will often bend and move with the moving parts of the vehicle. However, the application of the existing hot melt adhesive film on the automotive FFC wire has the following problems: [0004] 1. The adhe...

Claims

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Application Information

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IPC IPC(8): C09J7/50C09J7/30C09J7/25C09J167/00C09J11/08C09J11/04C09D167/00C09D7/63
CPCC08K2003/2241C08L2205/025C09D167/00C09J11/04C09J11/08C09J167/00C09J2467/00C09J2467/003C09J2467/006C09D7/63C09J7/255C09J7/30C09J7/50C08L67/00C08L63/00C08K3/22C08K5/29
Inventor 李政贺才利张强郭伟林
Owner 广东莱尔新材料科技股份有限公司
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