JPS59109540A - Sbr latex composition - Google Patents

Abstract

PURPOSE:To provide a SBR latex compsn. which has improved flexing properties and sound absorbing qualities and is lightweight and suitable for use as a packing material for carpets, by incorporating an inorg. microballoon having neither water absorptive power nor solubility in a SBR latex. CONSTITUTION:An inorg. microbaloon having neither water absorptive power nor solubility is incorporated in a SBR latex. Examples of the inorg. microballoons are silica, alumina, zirconia, etc. When the average particle size of the microballoon is too small, the desired function as microballoon can not be expected, while when its size is too large, the microballoon has an adverse effect on properties or performances which are required for the latex compsn. The microballoon is used in a quantity of pref. 10-50pts.wt. per 100pts.wt. (on a solid basis) latex.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an SBR latex composition, a composition suitable for use as a carpet backing agent, in which inorganic micro-hollow bodies are mixed.

Conventionally, SBR latex compositions have been used as backing agents for carpets, but such compositions contain, for example, about 9,350 to 450 parts of calcium carbonate, thickeners, and antifoaming agents per 100 parts of latex solid content. Ta.

However, in this conventional method, the weight is relatively heavy mainly due to the calcium carbonate mixed in, and when the latex composition is applied to the carpet, the flexibility is not necessarily good, such as cracks occurring when the carpet is bent. Moreover, the absorbency, which is related to recent neighborhood noise problems, was not necessarily satisfactory.

In view of these points, the present inventor has conducted various studies and examinations on effective means for weight reduction, and has determined that calcium carbonate can be replaced with negative micro hollow bodies that have virtually no suction or bath disintegrability. It has been discovered that the above object can be achieved by using the same, and this is the gist of the present invention.

The unlabeled hollow body used in the present invention includes:
For example, silica, silica alumina, alumina, alumina,
Zirconia etc. are not particularly limited.

In addition, if the average particle size of these hollow bodies is too small, favorable properties can be expected because of the hollow bodies, but on the other hand, if they are too large, the properties and performance required for the latex composition will be inhibited. Therefore, neither is preferable or unfavorable, and for this reason, it is generally appropriate to adopt an average particle size of about 10 to 300 μm.

It is necessary for the body in these materials to be substantially non-absorbent and non-soluble. The reason for this is that 5BIR latex generally has about 50% water9, and if it is water-absorbing or soluble, this water may enter the hollow part through the shell of the hollow body, or the shell itself may be carved. This is because by moistening, the hollow body collapses and achieves the desired purpose such as quantification.

For this reason, there are two ways to prevent substantial water absorption and solubility of the hollow body: one is to vitrify the shell of the hollow body at high temperature, and the other is to spray water on the surface of the inner wall. It's about rubbing. Among these, examples of water-repellent treatment include γ-methacryloxyglobyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, and N-β(aminoethyl)γ-niaminopropyltrimethoxysilane. Methoxysilane, β-(3,4 epoxycyclohexyl)ethyltrimethoxysilane2. Silane coupling agents such as γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, N-β(aminoethyl)γ-aminopropylmethyldimethoxysilane, γ-chloropropyltrimethoxysilane, and C8 It is appropriate to use a perfluoroalkyl group-containing compound having a perfluoroalkyl group of 7 to 18 and coat the surface of the hollow body with a fluorostatic shaking agent or the like.

Furthermore, it is appropriate that these hollow bodies have a true specific gravity of about 0.1 to 0.3 g/α. If the specific gravity exceeds the above range, the purpose of weight reduction will be achieved.

On the other hand, if it is less than the above range, there is a risk that the latex will stand out on the narrow surface, so both are not preferred.

In addition, the breaking strength of the hollow body under hydrostatic pressure is approximately 20 to 100
Something of the same size as the earth is suitable. Thus, the appropriate amount of such hollow bodies to be mixed into the SDR latex is about 10 to 50 parts by weight per 100 parts by weight of the solid content of the latex. If the amount of the compound is less than the above range, the shoe mass, texture, sound absorption properties, etc. will not be fully exhibited, and if it exceeds the above range, the strength of the compound will decrease, and the strength of the carpet, such as the thread removal strength and peel strength, will be reduced. Both are unfavorable as there is a risk that the

Thus, the SBR latex composition according to the present invention''*w
? II.For example, when used as a backing agent for carpets, the x4 of the backing agent will be approximately 1/3 compared to when using a conventional backing agent, and the full heavy lid including the carpet will be 33 to 42 parts lighter. becomes possible.

In addition, when used on carpets, the backing material does not crack even when folded, improving flexibility and sound absorption, which is an unexpected effect, as well as insulation properties. I have 0 points. In addition, unlike conventional foaming compounds, there is no northeast change or viscous change due to defoaming, and the product has excellent storage stability.

In addition to the above-mentioned hollow bodies, the SBR latex composition according to the present invention may contain nine various additives, such as thickeners, antifoaming agents, pigments, etc., as long as they do not impede the object of the present invention. can.

Next, the present invention will be explained using examples.

SDR latex (manufactured by Asahi Dow Co., Ltd. I, -2135) 100 parts by weight in terms of solid content contains silica-based hollow bodies (M-28, manufactured by Grabber Bell Co., Ltd.) having a particle size of 2o to 200μ, and Methoxysilane treated ・4
4 layers, polyacrylic resin thickener (Toagosei,
Aron A-20P manufactured by Kagakusha) I N type part, silicone oil emulsion (bundle LylQB M 5512
) 0.1, synthetic polycarboxylic acid (Aron AS-6310 manufactured by Toagosei Kagaku Co., Ltd.) 1.5n Shikibu Sakahama ≧ Toguchi mixed, and long-term measurement using a BL type viscometer at 6 r, pm (25°C). When I observed the stability, after making the legs it was 24000c,
It was 28,000C, 1) for 1 month Shun.

On the other hand, when the same amount of the above medium was prepared and observed in the same manner without surface treatment of the body, it was 24000C, 1) immediately after making the roux, and 44000C (1) after one month.
! , p was shown.

It is understood that the latex of the present invention is superior because if the viscosity after preparation is not within 4000 c.p, the amount of backing agent attached to the carpet will change, making quality control difficult.

In addition, the specific gravity of the latex of the present invention did not change even after one month, which was 0.71, and the comparative example product had a specific gravity of 0.7 after blood removal.
One month later, the specific gravity was as high as 098, which is close to the specific gravity of the latex itself, which is 1.0, and it is also understood that the latex of the present invention is lighter in weight.

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Claims (1)

[Claims] 1.8 An SBR latex composition characterized in that inorganic micro hollow bodies having substantially no water absorption or solubility are mixed into BR latex. 2. The composition according to claim (1), wherein the micro hollow bodies have an average particle size of 10 to 300μ. 3. The composition according to claim (1) or (2), wherein the inorganic micro hollow bodies have surfaces treated with water spraying. 4. The composition according to claim (1), wherein the amount of the inorganic micro hollow bodies mixed is 10 to 501 parts by weight based on 100 M parts of the solid content of the latex.