JPS607068B2 - Adhesive composition for carpet lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carpet backing adhesive composition with excellent blister resistance.

Conventionally, an aqueous emulsion composition has been applied as a carpet backing adhesive composition to the back side of a carpet to impart the thread removal strength, abrasion strength, dimensional stability, etc. required for the carpet.

This aqueous emulsion composition contains polymer latex, fillers, vulcanizing agents, vulcanization accelerators, anti-aging agents, etc. as necessary.
It is a composition obtained by mixing pigments, stabilizers, antifoaming agents, thickeners, etc.

However, when drying a carpet coated with an aqueous emulsion composition, if high-temperature and high-speed drying is carried out to improve productivity, a foaming phenomenon of the aqueous emulsion composition film will occur, and the film will partially blow out onto the back side of the carpet, resulting in a noticeable damage to the product. It may lose value.

This phenomenon is called blister, and the emergence of an aqueous emulsion composition with excellent blister resistance has been awaited. Furthermore, in recent years, filament fabrics such as polypropylene have been used as carpet base fabrics instead of conventional hydrophilic jute fabrics, but in this case, more blisters occur and the product value decreases. Its improvements are eagerly awaited.

As a method for preventing blistering, a method has been proposed in which an organic compound is added that is soluble in water and is compatible with the polymer group of the latex, but the anti-blister effect is insufficient. It has problems such as a decrease in performance as a carpet.

The inventors of the present invention have developed an adhesive composition for carpet lining with excellent pre-star resistance.As a result of extensive research,
2 or 0 per part by weight (solid content) of polymer latex 10
The swelling volume when left in water for 1 hour is 3. It has been found that the desired objective can be achieved by adding 1 to 3 parts by weight of non-swelling insoluble starch and/or starch derivatives having a ratio of c/ta or less, and the present invention has been achieved. .

The feature of this invention is that it does not swell in water at room temperature. Does insoluble starch and/or starch derivatives swell due to increased temperature? Its purpose is to prevent blistering by dissolving and increasing the viscosity of the aqueous phase in latex.

The polymer latex used in the present invention includes natural rubber latex, SBR latex, and self-crosslinking SBR.
Latex refers to all polymer latexes used for carpet lining such as LNBR latex, self-crosslinking NBR latex, polychloroprene latex, ethylene-pinyl acetate copolymer latex, vinyl chloride polymer latex, and polyvinyl acetate emulsion. It is something.

The swelling volume of the porridge used in the present invention when left in 260°C water for 1 hour is 3. Non-swelling and insoluble starch and/or starch derivatives having a ratio of c/ta or less have the inherent property of starch that they are non-swelling and insoluble in water at room temperature, but swell and dissolve when heat is applied and the water temperature rises. means all starches and/or starch derivatives;
Various starches produced from potatoes, wheat, corn, rice, tapioca, etc., as well as their etherified starches, cross-linked etherified starches, and esterified starches can be produced.

In the present invention, non-swelling means that starch is heated at 25°C.
The swelling volume when dispersed in water of 3.0 and left for 16 hours is 3.
Refers to the ratio less than c/ta. The amount of the starch and/or starch derivative added is 10 parts by weight of the polymer latex (
1 to 3 parts by weight per solid content), preferably 2 to 1
5 parts by weight.

If the amount added is less than 1 part by weight, no blister preventing effect will be observed. If the amount exceeds 3 parts by weight, an anti-blister effect can be observed, but it is economically disadvantageous. The gelatinization temperature of the starch and/or starch conductor is 50q.
o or more and less than 100 qo is preferable, and the gelatinization temperature is 50
If the temperature is less than 0 pm, an increase in the viscosity of the adhesive composition is observed and there is a problem in storage stability.

Moreover, if the gelatinization temperature is 100oC or higher, the blister prevention effect will be poor. The gelatinization temperature mentioned here is the amylograph (
This is the temperature at which the viscosity suddenly increases, as measured under conditions of a 15 weight percent suspension using a viscograph. The starch and/or starch derivative may be added to the polymer latex together with other ingredients when preparing the adhesive composition, or may be added to the polymer latex in advance.

The adhesive composition of the present invention may further contain conventional compounding agents such as fillers, dispersants, stabilizers, anti-aging agents, vulcanizing agents, flow accelerators, antifoaming agents, thickeners, etc., as necessary. It can be included.

The adhesive composition of the present invention can be applied to all woven and non-woven carpets that are backed with tufted carpets, knitted carpets, hook carpets, etc.
Furthermore, the processing methods include Mobe Yunuri processing (straight packing), jute woven fabric, synthetic fiber non-woven fabric, tortoise shell gauze, etc., as a backing material and bonding to the back side, and latex coating process as a preliminary step to applying foam latex. It can also be applied to

The adhesive composition of the present invention is made of polypropylene, which is most prone to blistering.

Shows excellent blister resistance when used in tufted carpets using split yarn as the base fabric. The present invention will be explained below with reference to Examples, but the present invention is not limited in any way by the Examples.

It should be noted that all compounding agents in the examples indicate parts by weight of solid content.

Example 1 10 parts (solid content) of self-crosslinking SBR latex, 1 part anti-aging agent, and 0.0 parts of dispersant were placed in a beaker equipped with a beaker.
A mixture (1) consisting of 5 parts, a filler (2) of 35 parts, and an esterified starch (2) with a gelatinization temperature of 60 qo were added in the form of a slurry and uniformly dispersed.

Next, 0.1 part of antifoaming agent (■) was added to remove air bubbles, and then thickener (■) and water were added to obtain a viscosity of 13,500 to 14,500 centipoise (BM type rotational viscometer, IXpm #4 rotor, 2
0qo) and adhesive compositions (sample numbers 1 to 4) having a solid content concentration of 75% were prepared.

Sample No. 5 is a comparative sample that does not contain esterified starch. The obtained adhesive composition was uniformly applied to the back side of a tufted carpet gray fabric whose base fabric was polypropylene split yarn and whose pile was nylon using an apparent weight of 1,500 yr/pillow, and a jute woven fabric backing material was applied. A non-dried carpet was obtained by pasting it on top.
** Regarding this carpet, the blister index, peel strength and pile pull-out strength of the backing material were measured, and the test results are shown in Table-1. Table 1 These measurement methods are shown below.

・Blister Index Undried carpet at a temperature of 17,000 and a hot air speed of 2 h/
After drying in a sec dryer for 3 minutes, the blisters generated were observed with the naked eye and evaluated according to the following grades.

Grade 1: No blistering was observed.

Grade 9: Many blisters occur on the entire surface.

・Peel strength and pile pull-out strength of backing material After drying the dried carpet at a temperature of 120 qo for 2 minutes, JIS
Measured according to L-1021-1974 "Rug Test Method". -Measuring the swelling volume of starch: Take 10 ml of starch in a graduated cylinder and disperse in water.

Adjust with water so that the total amount becomes 10 ratio c. This 2
The volume of the starch after swelling after being held for one vowel in a warm water tank at 5o±1°C is read in units of cc. It is expressed by multiplying this cc number by 0.1. ■ Self-crosslinking SBR latex (Sumitomo Nogatta SL7101) ■ Filler military grade calcium carbonate (Whitton S, Bihoku Funka Kogyo Co., Ltd. trademark) ■ Esterified starch gelatinization temperature 60oo, gelatinization viscosity 600 Brabender units (7 % aqueous solution) Katsuzake volume when dispersed in 25 qo of water and left to stand for 1 hour. &c Nota■ Antifoaming agent (Nopco 80
34, San Nopco Co., Ltd. trademark) ■Thickener polyacrylic acid soda (Aron A50PX, Toagosei Kagaku Co., Ltd. trademark) Example 2 Esterization of the same self-crosslinking type SBR latex and various compounding agents as in Example 1 with different gelatinization temperatures Adhesive compositions (sample numbers 6 to 9) were obtained by adding 7 parts of starch in the form of a slurry at room temperature.

Table 1-2 shows the viscosity of these samples after being left for one week at 20 oo after production, and the results of determining the blister index by producing undried carpets in the same manner as in Example 1.

Table 2 Example 3 Powders of different types of starch derivatives were added to the same self-crosslinking SBR latex and compounding agents as in Example 1 to obtain adhesive compositions (sample numbers 10 to 17).

For these trials, undried carpets were prepared in the same manner as in Example 1, and the blister index was determined. The results are shown in Table 3. Table 3 ■ Corn raw starch gelatinization temperature 83oo.

Gelatinization viscosity 300 Brabender units (7% aqueous solution)
Volume of expanded sake when dispersed in 2500 g of water and left for 1 hour
1.6c/ta■ Etherified starch gelatinization temperature 55oo.

Gelatinization viscosity 400 Prabender Unit (7% aqueous solution)
Swelling volume when dispersed in 25q○ water and left for 1 hour
2. Ratio c/ta■ Cross-linked etherified starch gelatinization temperature 8000.

Gelatinization viscosity 600 Brabender units (7% aqueous solution)
Swelling volume when dispersed in 25d0 water and left for 1 hour
1.4cc/ta■ Esterized starch gelatinization temperature 6000.

Gelatinization viscosity 600 Brabender units (7% aqueous solution)
Swelling volume when dispersed in 25q0 water and left for 1 hour
1. is c/ta ■ Etherified starch gelatinization temperature 53:0, gelatinization viscosity 380 Brabender units (7% aqueous solution), swelling volume when dispersed in 25o○ water and left for 16 hours 3. Ratio c/ta■ Etherified starch gelatinization temperature 52oo, gelatinization viscosity 380, Brabender unit (7% aqueous solution), swelling volume when dispersed in 2500 water and left for one hour 4. Ratio c/ta■ Fresh corn starch was dissolved in 3 times the amount of water while being dispersed and mixed while heating to 90°C to obtain a starch aqueous solution, and this aqueous solution was then added to the formulation.

Claims (1)

[Claims] 1 (A) 100 parts by weight (solid content) of polymer latex and (B) a swelling volume of 3 when left in water at 25°C for 16 hours.
．． An adhesive composition for carpet lining, the main component of which is 1 to 30 parts by weight of starch and/or starch derivative, which is non-swellable and insoluble at 0 cc/g or less and has a gelatinization temperature of 50°C or more and less than 100°C. . 2 (B) A non-swelling and insoluble starch with a swelling volume of 3.0 cc/g or less when left in water at 25°C for 16 hours, and a gelatinization temperature of 50°C or more and less than 100°C and/or A carpet backing adhesive composition according to claim 1, wherein the starch derivative is present in an amount of 2 to 15 parts by weight.