JPH04249564A - Vinyl chloride paste sol composition - Google Patents

Abstract

PURPOSE:To obtain the title composition improved in storage stability without detriment to the properties such as adhesion and strength by adding a specified substance to a mixture containing calcium carbonate during its kneading or adding calcium carbonate surface-treated with a specified substance to the mixture. CONSTITUTION:A vinyl chloride paste sol composition prepared either by adding a substance which can be adsorbed by calcium carbonate and/or a vinyl chloride paste resin to a vinyl chloride paste sol containing calcium carbonate and a vinyl chloride paste resin during its kneading, or by adding surface-treated calcium carbonate prepared by pretreating 100 pts.wt. calcium carbonate with 0.01-5 pts.wt. organic sulfonic acid to a vinyl chloride paste sol containing a vinyl chloride paste resin. Examples of the above adsorbable substances include 10-22C saturated and unsaturated fatty acids and their alkali metal salts and amine salts.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride paste sol composition containing calcium carbonate. More specifically, for vinyl chloride paste sol compositions used in various parts of automobiles such as underfloors and bodies, it is desirable to have good stability during storage without impairing the required physical properties such as adhesion and strength. The present invention relates to a vinyl chloride paste sol composition.

0002

[Prior Art] Conventionally, vinyl chloride paste sol, such as vinyl chloride paste sol for automobiles, generally contains paste resin, plasticizer, stabilizer, coloring agent, adhesion improver, filler, etc. as necessary. A widely used method is to mix, knead, and defoam, then paint the surface of a steel plate using a spray gun or the like, and melt and gel by heating.

However, when paste sol is actually used, it is usually stored in a storage tank after it is manufactured, and then transported to the painting site one after another. In order to prevent sedimentation, separation, etc., low-speed stirring of 10 rpm or less is always performed. During storage under low-speed stirring, it is desirable that the state of the paste sol, such as viscosity, should not change over time. However, for the reasons described later, when using calcium carbonate with particularly fine particles, This poses a problem in that the state of the paste sol may change significantly compared to immediately after production, such as the generation of aggregates or a decrease in viscosity.

[0004] Methods to solve these phenomena include stopping stirring during storage, and limiting the storage amount according to usage conditions so as not to store it for a long time. In the latter case, the stirring, which is originally used to prevent sedimentation of the paste-sol composition, is stopped, so long-term storage may cause sedimentation. It is not always easy to control the storage amount according to the situation, and there are also problems such as the inability to respond to sudden changes in usage conditions and the situation where production has no choice but to be discontinued.

On the other hand, there are two types of calcium carbonate used as a filler in paste-sol compositions in Japan, which are roughly classified and manufactured by the methods described below. One is heavy calcium carbonate, which is made by grinding raw limestone by wet or dry methods, classifying it by various methods, and turning it into powder or slurry having a desired particle size distribution. The other one is
Light carbonic acid obtained by calcining raw limestone to produce calcium oxide called quicklime, hydrating this calcium oxide to produce an aqueous suspension of calcium hydroxide called lime milk, and passing carbon dioxide-containing gas through the lime milk. Calcium or colloidal calcium carbonate.

[0006] In recent years, the automobile industry has been conducting intensive studies with the goal of reducing the weight of automobiles, and there has been a movement toward plastic parts for automobile parts, and in the case of vinyl chloride paste sol, In order to reduce the weight, methods such as reducing the specific gravity of the paste sol or reducing the amount of application are being considered.

[0007] Due to these movements, conventionally, calcium carbonate has a relatively large average particle size, for example,
A large amount of 3 μm grade filler was used as a filler, and a small amount of fine calcium carbonate was used to increase the viscosity of the paste sol. Studies are underway to increase the amount of finely divided calcium carbonate. When using a large amount of calcium carbonate with a large average particle size,
The specific gravity of the paste sol increases, and unless the amount of application is increased, a sufficient function for protecting substrates such as steel plates cannot be obtained.

[0008] As mentioned above, heavy calcium carbonate is calcium carbonate that is classified and adjusted into various grades by mechanically crushing limestone and classifying the crushed product, and has the characteristic that it can be produced at a relatively low cost. On the other hand, calcium carbonate, which has a broad particle size distribution and fineness above a certain level, has the disadvantage that it cannot be produced using current crushing and classification technologies. I have to say that it is not suitable for movement.

On the other hand, with the recent development of production technology, precipitated calcium carbonate obtained by passing carbon dioxide gas through milk of lime has become possible to be produced with various shapes and primary particle diameters, and can be used for the above-mentioned purpose. Calcium carbonate of fine particle size with sufficient physical properties has also been produced and is currently used in various formulations.

However, in the case of precipitated calcium carbonate, even after the formation of calcium carbonate particles and carbonation is completed, a small amount of alkaline content mainly composed of calcium hydroxide remains between the calcium carbonate particles. When the calcium carbonate is used as a filler in a vinyl chloride paste sol, due to its residual alkaline content, it chemically bonds with the paste resin during storage under low-speed stirring, resulting in a paste resin with calcium carbonate particles as its core. Agglomeration occurs, and a decrease in viscosity is caused by the generation of coarse aggregates or an excess of plasticizer in the paste-sol system.

[0011] As a means to solve this phenomenon, it is possible to carry out dealkalization by pH control, or to completely coat the particle surface with a surface treatment agent so that the alkali is not exposed from the calcium carbonate surface. However, in the former case, complete alkali removal is not possible, although dealkalization through pH control requires equipment and energy for liquid circulation processes such as stirring for a long time after carbonation is complete. The eluted alkaline content becomes calcium carbonate and precipitates on the existing calcium carbonate, increasing the particle size, so that it fully exhibits the expected function when blended with vinyl chloride paste sol. has not yet been achieved.

In the latter case, most of the surface treating agents for calcium carbonate conventionally used in vinyl chloride paste sol are sodium or potassium salts of fatty acids called fatty acid soaps, and these are used to treat the surface of calcium carbonate. A larger amount of treatment agent is required than in the past in order to completely coat the surface. Furthermore, when these surface treatment agents are applied to a steel plate and then gelled by heating, they are eluted between the steel plate and the paste sol, causing a decrease in adhesion.

[0013]

[Problems to be Solved by the Invention] As described above, when improving the vinyl chloride paste sol used in automobiles to make it suitable for weight reduction, the following two physical properties are required of calcium carbonate as a filler. Furthermore, in using finely divided calcium carbonate, storage stability under low speed stirring is added. (1) In order to reduce the specific gravity of the paste sol, high viscosity can be obtained with a small amount of blending. (2) In order to reduce the amount of paste sol applied, it has high functionality and can exhibit physical properties equivalent to conventional thick film coatings.

[0014] As mentioned above, at present, no fine calcium carbonate has yet appeared that can satisfy these requirements at the same time.

[0015]

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present inventors have developed a vinyl chloride paste that satisfies various physical properties particularly required for vinyl chloride paste sol for automobiles and has good storage stability under low-speed stirring. As a result of intensive studies on the relationship between sol compositions and fine calcium carbonate, we have developed a vinyl chloride paste sol composition in which a specific substance is added during kneading of a compound containing calcium carbonate, or calcium carbonate is surface-treated with a specific substance. The inventors have discovered that a product can satisfy all of the above requirements, and have completed the present invention.

[0016] That is, the first aspect of the present invention is to use an adsorbent substance on calcium carbonate and/or vinyl chloride paste resin.
The second aspect of the present invention is to add a vinyl chloride paste sol composition containing the calcium carbonate and the vinyl chloride paste resin at the time of kneading the vinyl chloride paste sol composition to 100 parts by weight of calcium carbonate, and add 0 sulfonic acid type organic acid to 100 parts by weight of calcium carbonate. .0
The content is a vinyl chloride paste sol composition prepared by blending 1 to 5 parts by weight of surface-treated calcium carbonate into a vinyl chloride paste sol containing a vinyl chloride paste resin.

[0017] The adsorptive substance to calcium carbonate and/or vinyl chloride paste resin used in the first invention is a saturated or unsaturated fatty acid having 10 to 22 carbon atoms, or an alkali metal salt or amine salt thereof. can be mentioned. Specifically, for example, capric acid (C10),
Saturated fatty acids such as myristic acid (C14), palmitic acid (C16), stearic acid (C18), and behenic acid (C22), or their alkali metal salts such as sodium and potassium, amine salts, etc., or Linderic acid (C12).
') Zomaric acid (C16'), oleic acid (C18')
), their alkali metal salts such as sodium and potassium salts, amine salts, etc., and these may be used alone or in combination of two or more.

These substances are preferably added in an amount of 0.05 to 5 parts by weight, more preferably 0.3 to 3 parts by weight, during kneading of a vinyl chloride paste-sol formulation containing calcium carbonate.

[0019]Adding at the time of kneading refers to the time of kneading when part or all of the vinyl chloride paste-sol formulation is mixed, but due to the manufacturing process, additives may be added in advance. This also includes the case where it is added and mixed into a blend of fine calcium carbonate, vinyl chloride paste resin, etc., and then kneaded as a vinyl chloride paste sol.

[0020] By adding the above-mentioned adsorbent substance, the storage stability under low-speed stirring becomes extremely good without impairing the original physical properties of the paste sol, compared to the case where the substance is not added.

Although the reason for this is not clear, these adsorbent substances are adsorbed on the calcium carbonate surface or the paste resin particle surface and inhibit the chemical bonding between the two.
It is thought that even when stored under low-speed stirring, there is no opportunity for the two to come into contact with each other, thus preventing the formation of aggregates.

[0022] Therefore, the greater the amount added, the better the storage stability will be, but if the adsorbent substance is in excess, that is, if it exceeds 5 parts by weight per 100 parts by weight of calcium carbonate, the adsorptive property will decrease. Excess material is liberated at the interface with the steel plate, causing problems in adhesion, strength, etc. On the other hand, if the amount added is too small, that is, if the adsorptive material is less than 0.05 parts by weight per 100 parts by weight of calcium carbonate, the above effect will not be achieved because the adsorptive material is in a small amount.

[0023] There are no particular restrictions on the calcium carbonate to which the adsorbent substance is blended, and it may be surface-treated or untreated as long as it functions as a vinyl chloride paste sol. When used for weight reduction, precipitated calcium carbonate having an average primary particle diameter of 0.5 μm or less is more preferable.

[0024] The fatty acid-based substances exemplified as the above-mentioned adsorbent substances are conventionally used as surface treatment agents for calcium carbonate, but as mentioned above, they are not added during kneading but are blended into the paste sol. Calcium carbonate is pretreated with a surface treatment agent in the usual way, and then dehydrated and
If it is blended into a paste sol after being dried and powdered, the surface of calcium carbonate cannot be uniformly coated, the above-mentioned effects are not observed, and on the contrary, adhesion etc. are impaired.

Examples of the sulfonic acid type organic acids used in the second invention include organic acids having a sulfonic group such as dodecylbenzenesulfonic acid and condensed naphthalenesulfonic acid, which may be used alone or in combination of two or more. It will be done.

The surface treatment amount is preferably 0.01 to 5 parts by weight, more preferably 0.1 to 3 parts by weight per 100 parts by weight of calcium carbonate. If it is less than 0.01 parts by weight, it will not be possible to completely neutralize and remove the residual alkaline content, and if it exceeds 5 parts by weight, even calcium carbonate that has already completed carbonation will be neutralized, and the original Not only will the functionality of calcium carbonate be lost, but the cost will also increase.

Calcium carbonate to be surface treated includes:
As in the case of the first invention, there is no particular restriction, and both heavy calcium carbonate and precipitated calcium carbonate can be used, but precipitated calcium carbonate is more preferred.

When using precipitated calcium carbonate, the residual alkaline content exposed on the surface is neutralized by surface treatment with a sulfonic acid-type organic acid, and then dehydrated, dried, and powdered in the usual manner, and then mixed with other compounds. After kneading and defoaming, a vinyl chloride paste sol composition is obtained.

For the purpose of improving dispersibility, the calcium carbonate surface-treated with a sulfonic organic acid may be further treated with at least one selected from alkali metal salts of fatty acids, alkali metal salts of resin acids, etc., if necessary. The surface can also be treated with The amount of surface treatment is suitably in the range of 0.01 to 5 parts by weight per 100 parts by weight of calcium carbonate.

The amount of calcium carbonate that has been surface-treated as described above is not particularly limited, but is, for example, 1 to 200 parts by weight per 100 parts by weight of vinyl chloride paste resin. If it is less than 1 part by weight, the effect of the present invention will not be fully exhibited, while if it exceeds 200 parts by weight, the resin content in the paste sol will be reduced and the strength will be poor.

The reason why the storage stability of the vinyl chloride paste sol composition under low-speed stirring is improved by incorporating calcium carbonate whose surface has been treated with a sulfonic acid type organic acid is that By neutralizing the calcium surface, alkaline content is not exposed on the calcium carbonate surface even after it is blended into the paste sol, and therefore no aggregates are formed with the paste resin, thereby maintaining the original physical properties of the paste sol. It is believed that the storage stability under low speed stirring is improved without any loss.

As mentioned above, the calcium carbonate used in the first and second aspects of the present invention is preferably precipitated calcium carbonate, but in order to more fully exhibit the effects of the present invention, it is necessary to use water. It is more preferable to use calcium carbonate, which has a lower total alkaline residue and is mainly composed of calcium oxide. Calcium carbonate with a small amount of residual alkaline content can be obtained by the following method.

[0033] That is, calcium hydroxide (Ca(OH)2) used when producing precipitated calcium carbonate
Adjust the concentration of the water suspension (milk of lime) to 50 to 300 g/liter, and adjust the temperature of the milk of lime to 5 to 2 g/liter before introducing carbon dioxide gas.
In the range of 0°C, 7 to 35 ml/min of carbon dioxide gas (purity 100%) per 1 g of Ca(OH)2 is introduced into the milk of lime, and after reaching a carbonation rate of 10 to 30%, carbon dioxide gas is introduced. Reduce the amount, i.e. 0.01 to 1 ml/min, preferably 0.05 to 0.5 m until the carbonation rate reaches 97%.
1/min (purity 100%), and thereafter carbonation is completed at an arbitrary gas flow rate.

7 to 35 to reach a carbonation rate of 10 to 30%
The setting of ml/min・1gCa(OH)2 is the amount of gas flow required to produce fine calcium carbonate of 0.5 μm or less, taking into consideration the function of the paste sol, and then 0.01 to 1 ml. /min・1gCa(OH)2 is because when fine particles of calcium carbonate complete carbonation in a short time due to a large amount of gas flow, a large amount of alkali remains, but a large amount of alkali remains in the aggregated particles. This is to remove as much alkaline content as possible.

By using the calcium carbonate with a low total alkali residue obtained in this way, it is possible to maintain the stability under low-speed stirring without impairing the physical properties such as strength, viscosity, and adhesion required for vinyl chloride paste sol. Storage stability can be improved even more significantly. In addition, more remarkable effects can be obtained by combining the first and second aspects of the present invention.

The carbonation rate referred to herein is obtained by the following formula.

The total alkali residue in the calcium carbonate dry powder that has been carbonated by the above method is determined by drying the carbonated calcium carbonate until the carbonation is completed (until the pH becomes 7 or less) at the initial amount of carbon dioxide gas introduced as usual. While the total alkali residue in the powder is about 2% or more, the alkali residue is surprisingly reduced to about 0.5% or less.

The total alkali residue was measured by the following method. "Method for measuring total alkaline residue in calcium carbonate" 0.2N Na2CO3 approximately 50% to 5g of sample
ml and make the total volume to 200 ml with water. After boiling for 30 minutes, suction filtration is performed and the residue is washed with water. The filtrate and washing solution were combined and initially treated with phenolphthalein as an indicator at 0.
Titrate with 3N HCl until the red color disappears (Am
l). Next, a mixed indicator consisting of methyl orange and indigo carmine or methyl orange is added and titrated to the discoloration point (Bml). Since it contains NaOH produced by the reaction and the residue of Na2CO3 added in excess, differential titration is performed to separate and quantify the two.

*(A-B) ml...Equivalent amount of H to NaOH
Cl ml number 0.3N HCl/ml = 11.1mg
Ca(OH)2

[0040]

[Examples] The present invention will be explained in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited by these in any way.

[0041] When explaining Examples and Comparative Examples, the formulation of the vinyl chloride paste sol composition to be prepared is based on the following, but if an adsorbent substance is added to the formulation, the timing of its addition may vary. Instead, a predetermined amount of calcium carbonate should be added separately from the basic formulation, in which case,
Each case will be described in the Examples or Comparative Examples.

[0042] The vinyl chloride paste sol composition was prepared and evaluated using the following equipment and conditions. (Composition) Vinyl chloride paste resin (Nippon Zeon Co., Ltd.: Zeon 121) 100 parts by weight DOP

100 polyamide (
Henkel Hakusui Co., Ltd.: DSX-140E)
10 solvent

5 Calcium carbonate

70

004
3] (Method for making vinyl chloride paste sol composition) ■ For kneading, mix the ingredients in a 3 liter stainless steel container according to the above recipe, and while externally cooling with water, use TK Lab Body Spar (manufactured by Tokushu Kika Kogyo). The mixture was mixed for 30 minutes at 3000 rpm using a 6 cm diameter disper blade. If other additives are to be blended, they should be added before calcium carbonate is blended, and if the effect is to be confirmed by changing the blending order, they should be added using the method separately described in the Examples and Comparative Examples. And so. (2) The mixture completed in (2) above was dispersed for 30 minutes using a strainer. ■ Mix and disperse the mixture according to the above ■ and ■ using a kneader (manufactured by Irie Shokai) 24rp.
The mixture was defoamed for 30 minutes using a vacuum pump while kneading at m, to obtain a vinyl chloride paste sol composition.

(Evaluation) Viscosity: 2.5 by BH type viscometer
The viscosity at rpm and 20 rpm was measured at 20°C. Storage stability: In a constant temperature room at 30°C, with concave stirring blade 5R
pm, 800 ml of the prepared vinyl chloride paste sol was placed in a 1-liter polyethylene beaker, and the change in viscosity over time was compared by viscosity measurement, and the presence or absence of aggregates in the paste sol was visually evaluated. . Adhesion: According to JIS A5758, an electrocoated steel plate was used as the adherend, and a tensile adhesion test was conducted.
The peeling state at that time was evaluated by the ratio of cohesive failure to the whole. The best peeling condition is when the cohesive failure ratio is 100%. Note that the test piece was prepared according to the JIS preparation method described above, and gelation of the paste sol was performed at 120° C. for 30 minutes.

Example 1 Milk of lime with a Ca(OH)2 concentration of 100 g/liter 20
Pour the liter into a 30 liter stainless steel tank and bring the liquid temperature to 1.
After adjusting the temperature to 5℃, CO containing 100% pure CO2 gas and 30% CO2 gas was stirred at 120 rpm using a turbine blade.
2 The mixed gas was introduced at a speed of 100 liters/minute, and the reaction was completed when the liquid pH reached 6.9, and the reaction was completed at a rate of about 2
．． 6 kg of calcium carbonate was obtained. The average primary particle diameter of this product was 0.06 μm as determined by an electron micrograph, and the total alkali residue measured by the method described above was 2.3% by weight.

A commercially available industrial fatty acid consisting of a Na salt of a fatty acid containing 20% by weight of stearic acid, 40% by weight of oleic acid, and 30% by weight of palmitic acid was dissolved in this calcium carbonate aqueous suspension with warm water at 80°C. After adding soap to the calcium carbonate in an amount of 3% by weight and surface treating it, the mixture was dehydrated, dried and powdered to obtain about 2 kg of calcium carbonate surface treated with fatty acid soap.

When kneading the vinyl chloride paste sol composition prepared by blending the surface-treated calcium carbonate thus obtained, 0.5 parts by weight of adsorbent material is added to 100 parts by weight of the above-mentioned surface-treated calcium carbonate. A vinyl chloride paste sol composition was prepared by adding stearic acid powder, and the composition was evaluated. The evaluation results are shown in Table 1, and good results were obtained in all items.

Example 2 To 100 parts by weight of the surface-treated calcium carbonate used in Example 1, 50% by weight of palmitic acid was added as an adsorbent.
A vinyl chloride paste sol composition was prepared and evaluated in the same manner as in Example 1 except that 3 parts by weight of a mixture containing 50% by weight of potassium oleate was added. The evaluation results are shown in Table 1.

Example 3 Surface-treated calcium carbonate 10 used in Examples 1 and 2
0 parts by weight, 1 part by weight of a commercially available industrial fatty acid soap used as an absorbent substance and a surface treatment agent for the calcium carbonate is added and mixed in advance to the calcium carbonate powder to be mixed, and then kneaded into a vinyl chloride paste sol. A composition was created and evaluated. The evaluation results are shown in Table 1.

Example 4 A vinyl chloride paste sol composition was prepared in the same manner as in Example 3, except that the amount of adsorbent used in Example 3 was changed to 6 parts by weight per 100 parts by weight of calcium carbonate to be blended. was created and evaluated. The evaluation results are shown in Table 1.

Example 5 20 liters of lime milk with a Ca(OH)2 concentration of 70 g/liter was put into a 30 liter stainless steel tank, and the liquid temperature was 20 g/liter.
After adjusting the temperature to ℃, CO2 containing 100% pure CO2 gas and 30% CO2 gas is stirred at 120 rpm using a turbine blade.
The mixed gas was introduced at a speed of 100 liters/minute, and when the carbonation rate reached 15%, the amount of gas introduced was changed to 1 liter/minute, and the reaction was completed when the liquid pH reached 6.9. , approximately 1.4 kg of calcium carbonate was obtained. The average primary particle diameter of this material according to an electron micrograph is 0.0
9 μm, and the total alkali residue was 0.48% by weight.

Example 1 was added to this calcium carbonate aqueous suspension.
Commercially available industrial fatty acid soap used as a surface treatment agent in 2.
Approximately 1.2 kg of surface-treated fine calcium carbonate powder was obtained by surface-treating 5% by weight, followed by dehydration, drying, and powdering.

A vinyl chloride paste sol composition was prepared and evaluated in the same manner as in Example 1, except that the surface-treated calcium carbonate thus obtained was used. The evaluation results are shown in Table 1, and even better results than those of the composition prepared in Example 1 were obtained.

Comparative Example 1 A vinyl chloride paste sol composition was prepared and evaluated in the same manner as in Example 1 except that the adsorptive substance in Example 1 was not added. The evaluation results are shown in Tables 1 and 2,
Viscosity reduction during storage stability was extremely poor, and a large amount of aggregates were generated.

Comparative Example 2 A vinyl chloride paste sol composition was prepared and evaluated in the same manner as in Example 1, except that the adsorbent substance added in Example 1 was changed to methyl stearate. The evaluation results are shown in Table 1.

Example 6 An aqueous suspension of calcium carbonate prepared in the same manner as in Example 1 was surface-treated in advance with 3 parts by weight of dodecylbenzenesulfonic acid per 100 parts by weight of the calcium carbonate solid content. Thereafter, the calcium carbonate of Example 1 was further treated with 2 parts by weight of the commercially available industrial fatty acid soap used as a surface treatment agent, and then dehydrated, dried, and powdered to obtain about 2 kg of fine calcium carbonate. A vinyl chloride paste sol composition was prepared by blending the calcium carbonate thus obtained and evaluated. The evaluation results are shown in Table 2.

Example 7 An aqueous suspension of calcium carbonate prepared in the same manner as in Example 1 was surface-treated with 0.5 parts by weight of condensed naphthalenesulfonic acid per 100 parts by weight of the calcium carbonate solid content. After that, 2.5 parts by weight of resin acid soda salt was further treated, followed by dehydration, drying, and powdering to obtain about 2 kg of fine calcium carbonate. A vinyl chloride paste sol composition was prepared by blending the calcium carbonate thus obtained and evaluated. The evaluation results are shown in Table 2.

Example 8 An aqueous suspension of calcium carbonate prepared in the same manner as in Example 5 was surface-treated with 0.5 parts by weight of dodecylbenzenesulfonic acid per 100 parts by weight of the calcium carbonate solid content. Then, after further treatment with 2.5 parts by weight of sodium oleate dissolved in 80°C hot water, about 1.2 parts of fine calcium carbonate is obtained by dehydrating, drying, and powdering.
I got kg. A vinyl chloride paste sol composition was prepared by blending the calcium carbonate thus obtained and evaluated. The evaluation results are shown in Table 2.

Comparative Example 3 An aqueous suspension of calcium carbonate prepared in the same manner as in Example 1 was treated with 7 parts by weight of dodecylbenzenesulfonic acid per 100 parts by weight of the calcium carbonate solid content.
Approximately 2 kg of fine calcium carbonate surface-treated powder was obtained by dehydration, drying, and powdering. The calcium carbonate thus obtained was blended to prepare and evaluate a vinyl chloride paste sol composition. The evaluation results are shown in Table 2.

[0060]

[Table 1]

[0061]

[Table 2]

[0062]

[Effects of the Invention] As mentioned above, when the vinyl chloride paste sol composition of the present invention is used in the automobile field, for example, it imparts high viscosity and high thixotropy, which are physical properties required for weight reduction. , and improves the storage stability under low-speed stirring of the prepared vinyl chloride paste sol composition without reducing other required physical properties, especially adhesion, i.e., without reducing the viscosity over time, and without reducing the agglomeration. It has good physical properties with almost no generation of substances. Thus, when the composition of the present invention is used in the automotive field, it makes a significant contribution to the weight reduction faced by the automotive industry.

Claims (10)

[Claims] 1. A vinyl chloride paste sol composition, wherein a substance adsorbable to calcium carbonate and/or vinyl chloride paste resin is added during kneading of a vinyl chloride paste sol containing the calcium carbonate and the vinyl chloride paste resin. 2. The composition according to claim 1, wherein the adsorbent substance comprises at least one selected from the group consisting of saturated or unsaturated fatty acids having 10 to 22 carbon atoms, and alkali metal salts or amine salts thereof. . 3. The composition according to claim 1, wherein the amount of the adsorptive substance added is 0.05 to 5 parts by weight per 100 parts by weight of calcium carbonate. Claim 4: For 100 parts by weight of calcium carbonate,
A vinyl chloride paste sol composition prepared by blending surface-treated calcium carbonate pretreated with 0.01 to 5 parts by weight of a sulfonic acid type organic acid into a vinyl chloride paste sol containing a vinyl chloride paste resin. 5. The amount of surface-treated calcium carbonate added is 1 to 200 parts by weight per 100 parts by weight of vinyl chloride paste resin.
5. A composition according to claim 4, in parts by weight. 6. The surface-treated calcium carbonate contains 0.1 to 5 parts by weight of at least one selected from the group consisting of alkali metal salts of fatty acids and alkali metal salts of resin acids, based on 100 parts by weight of the surface-treated calcium carbonate. 6. The composition according to claim 4, wherein the composition is further surface-treated. 7. The composition according to claim 1, wherein the total alkaline residue in the dry powder of calcium carbonate is 0.5% by weight or less. [Claim 8] Calcium carbonate is calcium carbonate 1
2. The composition according to claim 1, which is surface-treated calcium carbonate which has been previously treated with 0.01 to 5 parts by weight of a sulfonic acid type organic acid per 0.00 parts by weight. 9. The amount of surface-treated calcium carbonate added is 1 to 200 parts by weight per 100 parts by weight of vinyl chloride paste resin.
9. The composition of claim 8, in parts by weight. 10. The surface-treated calcium carbonate contains 0.1 to 5 parts by weight of at least one selected from the group consisting of alkali metal salts of fatty acids and alkali metal salts of resin acids, based on 100 parts by weight of the surface-treated calcium carbonate. The composition according to claim 8 or 9, which is further surface-treated.