JPS61188480A - Release agent - Google Patents

Abstract

PURPOSE:To provide a release agent enabling a rapid peeling without damage to a base material, which comprises an ester of a specific compound with an alcohol. CONSTITUTION:A release agent comprising an ester of a compound of the formula CH3(CH2)nCOOH and/or an adduct of CH3(CH2)nCOOH with R-OH (wherein n>=4; R is CxH2x+1; and x is 1-31 provided that, when x>=3, R may include isomers), with an alcohol of the formula CyH2y+1OH (wherein y>=1, provided that, when y>=3, the alcohol may include isomers).

Description

DETAILED DESCRIPTION OF THE INVENTION In recent years, advances in adhesives have been remarkable as living environments have become more diverse. Conventional bonding and fixing using adhesives has been subject to significant restrictions depending on the material and bonding ability of the objects to be bonded.

However, the current advances in adhesives have made it possible to overcome the conventional regulations by making great progress in bonding ability, regardless of the type of material of the object to be bonded (hereinafter referred to as the base material). It is no exaggeration to say that the improved adhesive strength and shortened bonding time have opened up new fields of application for metals, glass, ceramics, and plastics. Since the primary purpose of adhesives is to bond things together, they are designed to be difficult to peel off.

However, new applications for adhesives in metals, glass, ceramics, and plastics require strong instant adhesive properties as well as ease of peeling.

It would be impossible to develop an adhesive that could meet these conflicting demands. Therefore, a new release agent is required. Instant adhesive is for metal and glass.

In recent years, it has been in high demand as a temporary toning agent when cutting ceramics and plastics in layers. It is also used as a temporary fixing agent in polishing these materials.

However, in either case, it is peeled off when cutting and polishing are completed. Currently, ethyl acetate and ketone (mainly acetone) solvents are used in this stripping process. These solvent-based release agents have a mechanism of dissolving and peeling off the adhesive film. Therefore, peeling requires soaking for one day and night.

This long immersion not only dissolves the adhesive film, but also causes it to swell if the base material is plastic.

This will cause dissolution.

Also, from the standpoint of safety and hygiene, the use of ethyl acetate and ketone solvents is not desirable, and there is a risk of fire. When peeling pressure-sensitive adhesives, especially adhesive double-sided tapes, the adhesive force on the underside of the adhesive tape becomes strong, which tends to cause damage to the base material.

Therefore, it is necessary to impregnate the space between the base material and the bottom surface of the adhesive tape with a solvent and peel it off, paying the utmost attention to peeling.
If the base material is resin or printed plywood, whitening of the resin surface,
This will cause swelling, dissolution and destruction of the base material.

As described above, the release agents currently in use use solvents, which not only dissolve the adhesive film, but also cause damage to the base material, health and safety issues, and the risk of fire. Moreover, it takes a long time to obtain the original peeling ability.

By using the stripping agent according to the present invention, stripping can be performed in a short time without worrying about the drawbacks seen in conventional stripping agents.

CH3(CH2)nCOOH is n≧4 (n is an integer), and R in the R-OH adduct of CH3(CH2)nCOOH is CxH2x+1 (x = integer from 1 to 31)
and X≧3 includes isomers. CyH2,
Alcohol represented by +10H is y≧1 (y is an integer)
and y≧3 includes isomers. This CH3
(CH2>nC0OH and/or CHa(CHz)HC
A release agent made of an ester of an R-OH adduct of OOH and a product containing at least one alcohol does not dissolve the adhesive film, but penetrates between the base material and the adhesive film to form a release layer. By doing so, it is possible to peel off in a short time. What's more, there is no need for immersion like with conventional removers, and the area you want to remove (
The purpose can be achieved by applying a small amount. Furthermore, the stripping agent according to the present invention does not damage the base materials of metals, glass, ceramics, and plastics, and is free from concerns regarding safety, health, and fire hazards.

Example 1 Base materials are aluminum, iron, glass, polycarbonate,
Use a ceramic plate.

The dimensions of the board are 1 am x 5 cm (hereinafter the dimensions of the substrates are the same). Cyanoacrylate instant adhesives are used to adhere the same types of substrates. The adhesive area is 1
d (hereinafter the adhesive area is the same).

For the peel test, use the product 24 hours after adhesion.

As a stripping agent, an ester of 2-methyl-hexanoic acid and C16H330H is used. Apply a release agent to the four adjacent surfaces of each base material to be joined. The time required to peel off the coated substrate is as follows. Aluminum for 20 minutes, iron for 15 minutes, glass for 5 minutes, polycarbonate for 30 minutes, ceramics for 5 minutes. There was no damage to the base material.

Example 2 The base materials are iron and ceramics, glass and polycarbonate, and are bonded together using a cyanoacrylate instant adhesive.

A peel test was performed 24 hours after adhesion.

As a stripping agent, an ester of 3-ethyl-hexanoic acid and Cl8H370H is used. Apply a release agent to the four adjacent surfaces of each base material to be joined. The time required for peeling after application was 7 minutes for the bonded body of iron and ceramics, and 7 minutes and 80 seconds for the bonded body of glass and polycarbonate. There was no damage to the base material.

Example 3 The base materials are iron to iron, glass to glass, and glass to polycarbonate, and are bonded together using a cyanoacrylate instant adhesive.

A peel test was performed 24 hours after adhesion.

As a stripping agent, esters of 2-methyl-hexanoic acid and C16H330H and Cl8H370H are used. Apply a release agent to the four adjacent surfaces of each base material to be joined. The time required for peeling after application was 30 seconds for iron and iron, 20 seconds for glass and glass, and 1 minute for glass and polycarbonate. There was no damage to the base material.

Example 4 The base material was aluminum and printed plywood, and the adhesive was a synthetic rubber adhesive double-sided tape. After 24 hours of adhesion, the product was subjected to a peel test. As a stripping agent, esters of 2-propyl-hexanoic acid and Cl2H250H and C17H350H are used.

Apply a release agent to the four surfaces adjacent to the joint. The time required for the coating machine to peel off was 30 seconds on the aluminum side and 1 minute on the printed plywood side. There was no damage to the printed plywood surface.

Example 5 The base materials are iron-to-iron and glass-to-glass, which are bonded together using a cyanoacrylate instant adhesive. A peel test was performed 24 hours after adhesion.

Stripping agents are CH3 (CH2) lr, C0OH and C4H
An ester with 90H is used. This ester is 20
Since it gels slightly at temperatures below 40°C, it was heated to 40'C before use. Apply a release agent to the four surfaces adjacent to the joint. The time required for peeling was 25 minutes for iron to iron and 10 minutes for glass to glass.
It was a minute. There was no damage to the base material.

Example 6 The base materials are iron and glass, aluminum and polycarbonate, and are bonded together using a cyanoacrylate adhesive. After gluing 2
After 4 hours have passed, the sample is subjected to a peel test.

The release agent is CH3 (CH2) 16C00H and CH3 (C
H2) An ester of C3H7OH and 14COOH in a mixing ratio of 4:1 by weight is used.

Apply a release agent to the four surfaces adjacent to the joint. The time required for peeling was 7 minutes for iron and glass, and 15 minutes for aluminum and polycarbonate. Note that this ester slightly gels at temperatures below 20°C, so use one heated to 40°C.

There was no damage to the base material.0 Example 7 The base materials were glass and glass, iron and aluminum Ramura, and were bonded together using a cyanoacrylate instant adhesive.

Tests are conducted 24 hours after adhesion.

The release agent used is a mixture of the following three types (a), (b), and (c) in a weight ratio of 1:1.

(a) Ester of 3-ethyl-hexanoic acid and Cl8H370H (CI) CH3(CH2)20COOH and C4H9
Ester M CI (3(CH2)16COO with 0H
Apply a release agent to the 4 surfaces adjacent to H, C4H90H, and Noester bond.

The time required for peeling was 1 minute for glass and glass, and 3 minutes for iron and aluminum.

This release agent did not gel even at temperatures below 20'C.

Moreover, there was no damage to the base material.

Claims (4)

[Claims] (1) CH_3(CH_2)_nCOOH and/or C
A stripping agent consisting of an ester of an R-OH adduct of H_3(CH_2)_nCOOH and a product containing at least one type of alcohol. (2) The release agent according to claim 1, wherein CH_3(CH_2)_nCOOH is an integer of n≧4. (3) R-OH is an alcohol in which R is represented by CxH_2_x_+_1, x = an integer from 1 to 31, and x≧3
The stripping agent according to claim 1, wherein contains an isomer. (4) Alcohol is CyH_2_y_+_1OH (y≧
1), and y≧3 includes isomers.