JPH0643528B2 - Latex composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dip rubber product, foam rubber, wool fiber,
The present invention relates to a latex composition which is useful when manufacturing artificial leather, rubber fibers, carpets and the like. When the composition of the present invention is used as an adhesive for carpet backing, it is possible to obtain a composition having little change in viscosity with time and excellent in blister resistance and adhesiveness.

2. Description of the Related Art Currently, as an adhesive for lining a carpet, a composition in which a synthetic rubber latex is mainly mixed with a filler, a dispersant, a thickener, a stabilizer, and various other additives is used.
Usually, this adhesive is applied to the back surface of the carpet consisting of the primary base cloth and pile, and the backing base cloth (secondary base cloth) is pressed against this to dry and adhere, but recently, the primary base cloth and the secondary base cloth are adhered. Use polypropylene fiber with low breathability and low water absorption for the cloth, or increase the drying temperature to increase the drying speed,
As the drying air speed is increased, the phenomenon of blister (blistering due to foaming) on the back surface of the adhesive is becoming a problem.

As a measure against such a blister phenomenon, an adhesive containing a polymer dispersion, a filler, an organopolysiloxane compound and a nonionic surfactant has been proposed (Japanese Patent Publication Nos. 56-44,191 and 58-58). 1,15
No. 6 publication).

However, this method cannot satisfy the high degree of blister resistance required under recent severe conditions. That is, if the blister resistance is enhanced, the storage stability of the adhesive is deteriorated. It is also increasing in cases where latex manufacturers supply latex compositions having blister resistance, and carpet manufacturers add adhesives and fillers to them to manufacture adhesives themselves. Storage stability is required not only for the adhesive but also for the latex composition.

It was impossible in the prior art as described above to satisfy the requirement of having such a high degree of blister resistance and adhesive strength as well as having storage stability in both the adhesive and the latex composition. .

That is, if the amount of the organopolysiloxane compound used is increased to enhance the blister resistance, a large amount of nonionic surfactant is required to obtain the storage stability of the adhesive, and as a result, the adhesive strength of the adhesive decreases. To do. In addition, the nonionic surfactant has a harmful effect of reducing the blister resistance of the organopolysiloxane compound.

Further, a nonionic surfactant is also used to improve the stability of viscosity of the adhesive with the lapse of time. However, if the amount used is increased, the viscosity stability is improved but the blister resistance is reduced. However, there is a problem in that the adhesive strength is reduced.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is for the production of dip rubber products, foam lovers, carpets, etc., particularly when used as an adhesive for lining carpets, there is little change with time in viscosity, and in addition to blister resistance. The purpose of the present invention is to provide a latex composition having excellent adhesiveness.

Means for Solving the Problems As a result of extensive studies on the latex composition, the present inventors have used synthetic rubber latexes having a cloud point of 55 to 80 ° C. among organic polysiloxane compounds. By adding a salt of an aromatic sulfonic acid formalin condensate, there is little change in viscosity with time when used as an adhesive for carpet backing, and a latex composition excellent in blister resistance and adhesiveness is obtained. The present invention was completed, and as a result of further studies based on this finding, the present invention has been completed.

That is, the present invention relates to a synthetic rubber latex and 0.01 to 5 parts by weight of an organic polysiloxane compound having a cloud point of 55 to 80 ° C. and 100 to parts by weight of the solid content of the latex, and an aromatic sulfonic acid formalin condensate. The present invention relates to a latex composition containing 0.1 to 5 parts by weight of salt.

The synthetic rubber latex used in the present invention is, for example, a copolymer emulsion containing styrene-butadiene, acrylonitrile-butadiene, methylmethacrylate-butadiene, methylmethacrylate-styrene-butadiene, etc. as a main component, and particularly a copolymerization component. As an ethylenically unsaturated carboxylic acid, for example acrylic acid,
A copolymer emulsion containing methacrylic acid, itaconic acid, fumaric acid, maleic acid, crotonic acid, etc. in an amount of 0.5 to 5 parts by weight based on the total weight of the monomers is preferable. Further, in addition to these monomers, for example, one or more of acrylic acid ester, methacrylic acid ester, styrene, acrylonitrile, acrylamide, methacrylamide, isoprene or their derivatives or other copolymerizable monomers may be contained as a copolymerization component. Good. Also, a mixture of these synthetic rubber latices can be used.

Cloud point 55 to 80 added to the synthetic rubber latex of the present invention
Examples of the organic polysiloxane compound having a temperature of ℃ include Japanese Patent Publication No. 40-21 / 427 and Japanese Patent Publication No. 47-19604.
JP-A No. 50-24,336, US Pat. No. 3,246,339, and US Pat. No. 3,255,140.
Among the organic polysiloxane compounds described in Japanese Patent No. 1,141,867, etc., 1
% Aqueous solution has a cloud point of 55 to 80 ° C., especially an organic polysiloxane having a group having a polyether bond derived from a lower alkylene oxide (eg, ethylene oxide, propylene oxide) in the molecule. Compounds are preferred.

When the lower alkylene oxide is, for example, a mixture of ethylene oxide and propylene oxide, the structural formula thereof is, for example, as follows.

[In the formula, 1, m and n each represent an integer of 5 to 50.] The relationship between the structure of such an organic polysiloxane compound and the cloud point is not determined in a unitary manner. When has a structure having ethylene oxide and propylene oxide as a unit, it is considered that it mainly depends on the molar ratio of ethylene oxide and propylene oxide.

If the cloud point is less than 55 ° C, the viscosity of the latex composition changes significantly with time, and gelation occurs when it is stored at 40 ° C for 7 days. If the cloud point exceeds 80 ° C., the blister resistance will be insufficient when used as an adhesive for carpet backing.

The addition amount of the organic polysiloxane compound is suitably 0.01 to 5 parts by weight, and particularly preferably 0.1 to 2 parts by weight, per 100 parts by weight of the synthetic rubber latex solid content. In the present invention, the addition amount of the organic polysiloxane compound can be reduced by using this compound in combination with a salt of an aromatic sulfonic acid formalin condensate described below. When the addition amount of the organic polysiloxane compound is less than the above, the blister resistance becomes insufficient, and when the addition amount is large, the storage stability of the adhesive and the latex composition becomes insufficient.

Examples of the salt of an aromatic sulfonic acid formalin condensate used in the present invention include salts of a formalin condensate such as naphthalene sulfonic acid and alkylnaphthalene sulfonic acid (where alkyl has about 1 to 4 carbon atoms). Examples of kaitin which forms a salt include sodium, potassium and ammonium, but it is usually convenient to use a sodium salt. The addition amount may be 0.1 to 5 parts by weight based on 100 parts by weight of the solid content of the synthetic rubber latex, and the amount may be appropriately selected in relation to the addition amount of the organic polysiloxane compound. When the salt of the aromatic sulfonic acid formalin condensate is too small with respect to the amount of the organic polysiloxane compound added, the storage stability of the adhesive or latex composition becomes insufficient, and the salt of the aromatic sulfonic acid formalin condensate becomes insufficient. If the amount is too large, the blister resistance and adhesiveness are adversely affected.

In this manner, the latex composition of the present invention is obtained. In addition to the above components, the latex composition of the present invention contains other types of emulsions, surfactants, blister-resistant additives, blister-resistant auxiliary agents, etc. It is also possible to use them together in a range that does not impair the purpose or to further enhance the effects of the present invention.

The latex composition of the present invention thus obtained,
For example, it is advantageously used in the production of dip rubber products, foam rubber, wool fibers, artificial leather, rubber fibers, carpets, etc. It may be added and thickened.

As the filler, for example, calcium carbonate, aluminum hydroxide, clay, talc and the like can be mentioned, but it is usually preferable to use calcium carbonate or aluminum hydroxide. The amount of the filler added is 100 to 70 relative to 100 parts by weight of the solid content of the synthetic rubber latex.
It is 0 part by weight, particularly preferably 150 to 600 parts by weight.

If it is less than 100 parts by weight, the synthetic rubber latex is expensive, which is disadvantageous in terms of cost and inferior in blister resistance. On the other hand, if it exceeds 700 parts by weight, the adhesive strength becomes insufficient, which is not preferable for the purpose of adhesion.

In addition to the above fillers, if necessary, for example, dispersants, antioxidants, crosslinking agents, vulcanizing agents, vulcanization accelerators, pigments, surfactants, wetting agents, stabilizers, defoaming agents, A bactericidal agent, a thickener, etc. are added to make an adhesive for carpet backing.The types, amounts, and order of addition of these additives are latex composition, carpet adhesive manufacturing conditions, workability, and stability. The solid content of the adhesive may be 50 to 83% by weight. When a latex manufacturer manufactures the latex composition, and a carpet manufacturer or a carpet adhesive manufacturer manufactures a carpet adhesive, additives are preferably added to the latex composition, and then the carpet adhesive is added. A latex composition that requires only a filler and a thickener at the time of production is required, but the present invention enables such a method. The additives of the present invention and other various additives are effective when added during the production of latex, and may be added to the latex as a product.

The carpet adhesive thus obtained can be applied to tufted carpets, knitted carpets, and all other carpets having an adhesive applied to the back surface. Further, the present invention can be applied to a case where a backing material such as a woven fabric such as jute or polypropylene or various non-woven fabrics is adhered, and a case where the backing material is not used and a straight backing is used.

EFFECT OF THE INVENTION The latex composition of the present invention has little change in viscosity with time,
It does not gel when stored at 40 ° C for 3 months or more, so it is advantageously used in the production of dip rubber products, foam rubber, carpets and the like. Especially when it is used as an adhesive for carpet lining, it is excellent in storage stability and is remarkably excellent in blister resistance and adhesiveness.

Next, the present invention will be specifically described with reference to Examples and Comparative Examples. Parts and% in each example mean parts by weight of solids and% by weight of solids.

Examples 1 to 3, Comparative Examples 1 to 4 Carboxyl-modified styrene-butadiene synthetic rubber latex Crosslen SA-65 (manufactured by Takeda Pharmaceutical Co., Ltd.)
To 100 parts of this solid content, 1 part of sodium tripolyphosphate and the additives shown in Table 1 were added and mixed to obtain a latex composition. 400 parts of heavy calcium carbonate, an appropriate amount of silicone antifoaming agent and an appropriate amount of thickening agent Aron 20P (product of Toagosei Kagaku Kogyo Co., Ltd.) were added to this latex composition and mixed, and adhesive for carpet lining with a total solid content of 75% I used it as an agent. 1150 g / m ^{2 of} this adhesive was applied on a roll (30 × 25 cm) having 1/10 cage nylon loop pile.
Was applied quickly and uniformly. Apply the same type of 7 ounce jute on it and press it gently with a roll, then 160 ℃
15 minutes in a hot air dryer. The peel strength of the bonded carpet was measured by a conventional method. Separately adhesive 20
The blister resistance of the carpet stock coated with 00 g / m ² was measured under the conditions shown in Table 1. The viscosity of the above latex composition and the adhesive for lining the carpet at the time of preparation and 40 ° C.
The viscosity after 7 days of storage was measured. The results are shown together in Table 1.

Example 4-6, Comparative Example 5-7 A latex composition was obtained in the same manner as in Example 1, except that the addition amount of heavy calcium carbonate and the total solid content were changed as described in Table 2. An adhesive for backing a carpet was obtained. The adhesive was quickly applied to the stock having 1/8 gauge acrylic loop pile in the amounts shown in Table 2. Apply the same type of polypropylene secondary base cloth on top of this, press it with a roll, and then press in a hot air dryer at 160 ° C for 1
It was dried for 5 minutes. Separately, an original carpet sheet coated with 2000 g / m ² of an adhesive was dried in a gear oven at 230 ° C. for 5 minutes so that wind with a wind speed of 1.5 m hits the coated surface at right angles, and the degree of blister generation was examined. The peel strength of the carpet, the viscosity change of the latex composition and the adhesive for backing the carpet were determined in the same manner as in Example 1. The results are shown together in Table 2. Items other than the blister resistance test are the same as the notes in Table 1.

Claims (1)

[Claims] 1. A salt of an aromatic sulfonic acid formalin condensate and 0.01 to 5 parts by weight of an organic polysiloxane compound having a cloud point of 55 to 80 ° C. per 100 parts by weight of a synthetic rubber latex and a solid content of the latex. A latex composition containing 0.1 to 5 parts by weight of