JPS60173171A - Adhesive composition for lining carpet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to carpet backing adhesive compositions.

Specifically, it is an adhesive composition for carpet lining which contains 0.01 to 3 parts by weight of polyvinyl alkyl ether as a main binder per 100 parts by weight (solid content) of copolymer latex.

In conventionally widely manufactured carpets, adhesives are used to prevent the piles that make up the carpets from falling off.

The adhesive also serves to bond the backing material, prevent the carpet from fraying, and provide a desirable texture and dimensional stability.

Traditionally, adhesives used for this purpose include copolymer latexes containing fillers, dispersants, stabilizers, vulcanizing agents, vulcanization accelerators, antiaging agents, pigments, antifoaming agents, and thickeners. It is an adhesive composition obtained by mixing adhesives, etc.

The advantages of using such an adhesive composition are that there is less risk of fire during carpet processing compared to solvent-based adhesives, the adhesive has a low viscosity at high concentrations and is easy to process, and there is no pollution caused by organic solvents. Examples include the fact that there is no pile, and that the adhesive permeates into the pile appropriately.

However, it is necessary to evaporate water with large latent heat.
In the carpet manufacturing process, large dryers are used to dry carpets at high temperatures in order to increase productivity.

If high-speed drying by heating is performed in order to increase productivity, boiling may occur inside the adhesive, and the adhesive film may partially blow out onto the back side of the curtain, significantly damaging the commercial value.

This phenomenon is called a blister.

In recent years, the majority of carpet fabrics (core) have been replaced from conventional jute fabrics to filament fabrics such as polypropylene, resulting in insufficient breathability and water absorption, making blisters extremely likely to occur.

Blisters, which affect product value, are the biggest obstacle to improving productivity in the carpet manufacturing process.

To prevent blistering, a method is known in which an organopolysiloxane and a nonionic emulsifier are used in combination, as described in JP-A-56-149478.

Addition of organic polysiloxane or organopolysiloxane destabilizes the adhesive composition.

It is true that when a nonionic emulsifier is used in combination, the stability at room temperature is improved, but the stability at high temperature is not improved.

Due to these drawbacks, there are problems such as an increase in the temperature of the tank in the summer and coagulation of the adhesive in the pipes near the carpet drying process in the factory.

The present inventors have conducted intensive research to develop an adhesive composition with sufficient stability tL with less blistering, and as a result,
Copolymer latex 100, which is the main component of the adhesive composition
0 liter of polyvinyl alkyl per part by weight (solid content)
．． It has been found that adding 0.01 to 3.0 parts by weight achieves the desired purpose and also improves adhesive strength, and has arrived at the present invention.

The copolymer latex that is the main component of the adhesive composition used in the present invention includes SBR latex, self-crosslinking type SBR latex, NBR latex, self-crosslinking type N
This term refers to all copolymer latexes used for carpet backing, such as BJs-latex, ethylene-vinyl acetate copolymer latex, and vinyl chloride polymer latex.

As the polyvinyl alkyl ether used in the present invention, those described in German Patent No. 869,861 and German Patent Application Publication No. 1,569,119 are used, and polyvinyl methyl ether is preferably used.

The polyvinyl alkyl ether is used in an amount of 0.01 to 3.0 parts by weight per 100 parts by weight of the copolymer latex (solid content).

If it is less than 0.01 part by weight, the resulting adhesive will have a small anti-blister effect. If it exceeds 3.0 parts by weight, the stability of the adhesive composition will deteriorate.

In addition, fillers, dispersants, stabilizers,
Vulcanizing agents, vulcanization accelerators, anti-aging agents, pigments, antifoaming agents, thickeners and the like can be used without particular limitation as long as they are commonly used.

The adhesive composition of the present invention can be applied to all woven and non-woven fabrics such as tufted carpets, knitted carpets, hook carpets, etc., which are subjected to backing processing. It can also be applied to straight backing, laminating jute fabric, synthetic nonwoven fabric, tortoiseshell gauze, etc. to the back side as a backing material, and latex coating as a preliminary step to applying foam latex.

The adhesive composition of the present invention exhibits excellent blister resistance when applied to tufted carpets whose base fabric is polypropylene split yarn, which is the most prone to blistering.

The present invention will be explained below with reference to Examples.
The present invention is not limited in any way by the examples.

Example 1 A dispersant was prepared in the following ratio in a beaker equipped with a stirrer.

Part by weight Self-crosslinking SBR latex 100 (solid content) Anti-aging agent 1 Dispersant 0.5 Heavy calcium carbonate 350 Polyvinyl methyl ether was added to each of the above dispersants, and an antifoaming agent and sodium polyacrylate were added. and set the viscosity to 20
000 centivoise (BM type viscometer No. 4 rotor, 6
R, P, M,). An adhesive composition was obtained by adjusting the solid content concentration to 75%.

The obtained adhesive composition was uniformly applied to the back side of a tufted carpet greige whose base fabric was polypropylene splint yarn and whose pile was nylon at an apparent weight of 150011r/y++F, and a jute woven backing was applied on top. An undried carpet was obtained.

Blister resistance: Undried carpet was dried in a dryer at a temperature of 170° C. and a hot air velocity of 20 m/see for 3 minutes, and blisters generated were observed with the naked eye and evaluated according to the following grades.

No occurrence of first-class niblisters was observed.

There are many class 8 niblisters on the entire surface.

The results are shown in Table 1.

Secondary base fabric peel strength: After drying an undried carpet prepared in the same way as the one used for the blister resistance test in a dryer at 120°C for 20 minutes, a carpet of width 5 cm x length 15 cm was prepared.
Samples were taken, and the peel strength of the second base fabric and the second base fabric
Measured by method VC of SL-1021.

Viscosity stability: The viscosity of the adhesive composition was measured after it was left at 25° C. for one week and after it was boiled for 2 minutes.

(Measured with 13M type No. 4 rotor 6 R, P, M) Below is the margin Example 2 A dispersant was prepared in the following ratio in a beaker equipped with a stirrer.

Parts by weight Self-crosslinking type SBR latex 100 (solid content) Anti-aging agent 1 Dispersant 0.5 Polyvinyl methyl ether 1 Fillers shown in Table 2 were added to the above dispersant, and an antifoaming agent,
Sodium polyacrylate was added to adjust the viscosity to 20,000 centipoise to obtain an adhesive composition.

A carpet was made using the obtained adhesive composition in the same manner as in Example 1, and the blister resistance was measured.

The results are shown in Table 2.

The date is shown below

Claims (1)

[Claims] 1. An adhesive composition for carpet lining, characterized in that the main binders are 100 parts by weight of copolymer latex (solid content) and 0.01 to 3 parts by weight of polyvinyl alkyl ether.