JPH0415237A - Resin additive - Google Patents

Abstract

PURPOSE:To obtain an additive which when added to a resin, can improve its transparency, heat stability and antiblocking properties, by using microcrystalline calcium silicate hydrate having a specified chemical composition, specified positions of X-ray diffraction peaks and a specified refractive index as an effective component. CONSTITUTION:Amorphous silica having a BET specific surface area of 150-400m<2>/g and a secondary particle diameter of 1-10mum is mechanochemically allowed to react with Ca(OH)2 containing 4-8wt.% (in terms of CaO) mike of time in the presence of water for 6-10hr to obtain microcrystalline calcium silicate hydrate having a chemical composition of the formula (wherein X is 1.0-2.0; and (n) is 0.3-1.0), X-ray diffraction peaks at spacings of 3.04-3.08Angstrom , 2.78-2.82Angstrom and 1.81-1.84Angstrom and a refractive index of 1.49-1.57. The obtained compound is optionally mixed with a plasticizer, a lubricant, a filler, a colorant, etc., to obtain the title additive.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a compounding agent for resins comprising microcrystalline calcium silicate hydrate, and more specifically, it has excellent transparency, thermal stability, and This invention relates to compounding agents for resins that have excellent anti-blocking properties and the like.

(Prior Art) In order to impart various functions to resin molded products such as films, various compounding agents such as inorganic fillers are blended. These compounding agents are broadly divided into compounding agents for chemical modification, which aim to modify the chemical properties of resin, and compounding agents, which modify physical properties, which aim to modify the physical properties of resin molded products. Ru. Examples of the former are thermal stabilizers that suppress the dehydrochlorination reaction of chlorine-containing polymers, and stabilizers that suppress deterioration due to residual halide catalysts contained in olefin resins. Examples include anti-blocking agents for preventing blocking of stretched resin films.

It has been known for a long time that silicates such as calcium silicate are used as compounding agents for chemical modification and compounding agents for modifying physical properties. It is described that it is blended into a polymer as a heat stabilizer, and it is also disclosed in Japanese Patent Publication No. 61-36866.
The publication describes that acid-treated zeolite is contained in a resin film as an anti-blocking agent.

(Problems to be solved by the invention) Silicate particles such as calcium silicate have good pigment properties and have excellent blending performance and dispersion performance in resin, and react with and capture hydrogen chloride and chloride ions. It has the characteristic of
In addition, it has the characteristic of forming convex portions on the film surface to improve anti-blocking properties and slipping properties, but it is said that it increases the haze of the resin composition containing it and impairs transparency. There are drawbacks.

In the case of resin films, a decrease in transparency is a fatal drawback, and in the case of colored films and other colored resin molded products, a decrease in transparency has disadvantages such as the need to increase the amount of colorant to be blended. bring about.

The present inventors have discovered that the microcrystalline calcium silicate hydrate described in detail below is extremely transparent when blended into resin molded products such as films, and is a compounding agent for chemical modification and a compounding agent for modifying physical properties. We have found that it is extremely useful for applications such as

That is, the object of the present invention is to provide calcium silicate which is transparent when blended with a resin and has excellent chemical modification performance such as hydrogen chloride and chloride ion scavenging performance and physical property modification performance such as anti-blocking property. #M is used as a compounding agent for the resin of the system.

(Means for solving the problem) According to the present invention, the main component is the formula % formula % (1), where X is a number from 1.0 to 2.0, particularly from 141 to 1.8, n is 0.3 to ], 0, especially 0.5 to 0.
It is the number 9.

It has a chemical composition expressed as follows, and a lattice spacing of 3.04 to 3.04.
08 people, 278 to 2.82 people and 1.81 to 1.8
4 people have X-ray diffraction peaks, and 1,49 to 1,5
A resin formulation is provided, characterized in that it consists of @crystalline calcium silicate hydrate having a refractive index of 7.

The microcrystalline calcium silicate hydrate used in the present invention has the following formula % formula % (2) In the formula, θ1 is the peak perpendicular to the X-ray diffraction peak of the interplanar spacing of 3.04 to 3.08 and the peak tangent on the included angle side. θ2 is the angle between the peak perpendicular and the wide-angle side peak tangent at the peak, and the stacking irregularity index (Ig) defined by is 1.75 or more, especially within the range of 1.8 to 240. Under an electron microscope, this microcrystalline calcium silicate hydrate has a number average particle diameter (secondary particle diameter) of 0.1 to 10 μm, especially 0.1 to 5 μm, and a particle diameter of 50 to 250 mA.
/ 100g, especially 80-200ml / 1 [1
0g oil absorption (JIS K 5101) and 60 to 20
0 m2/g, in particular a specific surface area (BET) of 70 to 150 m''/g.

(Function) Calcium silicate includes Nekoite.
, Okenitel, Xonotrite (Xo
notHte), Foshaguide (Foshagit)
e) Wollastonite group such as Jennite, Metajennite, etc.: 14 Tobermorite
, 11-person tobermorite, 9.3-person tobermorite, and other tobermorite groups; Gyroli
te), Tobermorite (Truscottite),
Gyrolite group such as Z-phase; Calcio-ch
ondrodite), Afwi 1
Although an extremely wide variety of minerals are known, such as 7-C2S group minerals such as 3.08 people, 2.78 to 2.
It is notable that it has X-ray diffraction peaks of 82 and 1.81 to 1.84.

The microcrystalline calcium silicate hydrate used in the present invention has a Ca/St ratio close to about 576.
The chemical composition is tobermorite, namely Ca5(Si6J6)1
2) m)120 = (3) m is similar to 8.4 or 0, but significant differences in hydration and crystal structure are enhanced.

That is, the value of n in equation (1) is 1.8 for the 14-person type, and approximately 1 and 9.3 for the 11-person type.
The value of n in the microcrystalline calcium silicate hydrate of the present invention is 0.3 to 1.0, whereas it is 0.2 in the human type, and 11 in the human type and 9 in the human type.
．． It shows an intermediate value between the three-person type.

FIG. 1 of the accompanying drawings is an X-ray diffraction pattern of the microcrystalline calcium silicate hydrate of the present invention, and FIG. 2 is an X-ray diffraction pattern of 11-type tobermorite.

In addition, Figure 3 shows the microcrystalline calcium silicate of the present invention.
This is a scanning electron microscope photograph of hydrate, and FIG. 4 is a scanning electron microscope photograph of the above-mentioned 11-type tobermorite.

From the comparison between FIG. 1 and FIG. 2, it is clear that the microcrystalline calcium silicate hydrate of the present invention has the lattice spacings of 3.04 to 3.08 and 1.81 to 1.8, which are specific to tobermorite.
It has a weak diffraction peak at 4 people, but instead of two peaks with high intensity, 3.07 to 3.09 people and 2.80 to 3.00 people, it has an interplanar spacing of 3.04 to 3.08 people. It is clear that it has a single peak and almost no diffraction peak with a lattice spacing of 12.0 to 11.0, which is characteristic of tobermorite.

Further, referring to FIG. 3 and FIG. 54, the presence of primary particles of plate-like crystals is clearly recognized in the case of 11-nin tobermorite, whereas in the microcrystalline calcium silicate hydrate of the present invention, the presence of primary particles of plate-like crystals is clearly recognized. Only a regular agglomerated secondary particle structure is observed. Conventionally, fibrous calcium silicate/hydrate has been known as a calcium silicate/hydrate of the dopasolite group with a low degree of crystallinity, but the microcrystalline calcium silicate/hydrate of the present invention is It is recognized that it is a completely different mineral in that it is irregularly shaped and has a woody layered crystal structure, as detailed below.

Tobermorite has a basic three-layer structure sandwiched between two Cab octahedral layers with a Sin tetrahedral layer in between, and has a layered crystal structure in which this basic three-layer structure is laminated in large numbers in the C-axis direction. Be enriched with what you have. In the microcrystalline calcium silicate hydrate of the present invention, a diffraction peak in the two-dimensional direction (hk) is observed, indicating that this basic three-layer structure has been developed to some extent, but there is virtually no included-angle side peak. From this, it is recognized that there is no stacking in the C-axis direction.

In the synthetic microcrystalline calcium silicate hydrate according to the present invention, the aforementioned layers overlap in parallel, but certain specific irregularities are observed in the relative positions of the layers. FIG. 5 of the accompanying drawings is an enlarged diagram of the diffraction peak near d=3.08 in the X-ray diffraction spectrum of FIG. 1. From Fig. 5, this peak rises on the narrow-angle side (smaller 2θ side), and on the wide-angle side (lower 2θ side).
On the larger 2θ side), an asymmetric peak with a gentle slope is shown. In a structure in which the layers are regularly stacked, this peak is symmetrical, and the asymmetric peak described above indicates that there is some irregularity in the relative position of each layer.

In this specification, the stacking irregularity index (rs) of calcium silicate hydrate is defined as follows. That is, an X-ray diffraction chard as shown in FIG. 5 is obtained by the method described in the Examples described later. This d=3.04~3
．． For 0811 people, the maximum slope peak tangent a on the narrow angle side and the maximum slope peak tangent s on the wide angle side of the peak are included,
Draw a perpendicular line C from the intersection of tangents a and s. Then the tangent a
Find the angle θ1 between the tangent and the perpendicular C, and the angle θ2 between the tangent and the perpendicular C. 6. The stacking irregularity index (Ig) is 15=tanθ, / tanθ+..." (2)
Find it as the value of This index (s') is 1.0 when the peak is completely symmetrical, and increases as the degree of asymmetry increases.

The synthetic microcrystalline calcium silicate hydrate according to the present invention has a stacking irregularity index (I) of 1475 or more,
In particular, it is in the range of 1.8 to 2.0.

The microcrystalline calcium silicate hydrate of the present invention has a refractive index (
n1i°) is controlled in the range of 1.49 to 1.57, especially 1.52 to 1.56, and even when added to the resin, it does not increase the haze of the resin, and it is suitable for films, etc. The advantage is that the transparency of resin molded products can be maintained at a high level. In addition, although this microcrystalline calcium silicate hydrate is a crystal, it has a relatively large surface area, has excellent reactivity with hydrogen chloride, chlorine ions, etc., and has a remarkable effect of stabilizing the resin. Also,
Unlike amorphous minerals, it is chemically and physically stable, and its secondary particle structure is also stable and resistant to agglomeration.
Due to its excellent dispersibility in resins and the stability of its secondary particle structure, anti-blocking properties can be imparted effectively, stably and reliably when incorporated into films and the like.

As shown in Figure 's3, the microcrystalline calcium silicate hydrate of the present invention has a secondary particle structure with a clear and uniform particle size, and the number average particle size is in the range of 0.1 to 10μ. This is one of the remarkable advantages as a resin compounding agent. Also, in connection with this microcrystalline structure, this calcium silicate hydrate has a relatively high oil absorption, generally in the range of 50 to 250 ml/100 g, particularly in the range of 8θ to 200++1J27100 g. Furthermore, the calcium silicate hydrate generally has a BET specific surface area of δO to 200 m 2 /g, in particular 70 to 150 m'/g. BET specific surface area S A (m
2/g) and the -order particle diameter D (nm), there is a relationship expressed by the formula, and the primary particle diameter calculated from this formula (4) is 10 to 50 nm, especially 15 to 40 nm. This shows that the microcrystalline calcium silicate hydrate crystals of the present invention are so fine that they exceed the observation limit with a normal electron microscope, and can only be detected as secondary particles.

(Preferred Embodiment of the Invention) The microcrystalline calcium silicate hydrate used in the present invention is obtained by mechanochemically reacting amorphous silica and calcium hydroxide in the presence of water. Mechanochemical reaction is a reaction under conditions where mechanical grinding force is applied to amorphous silica, and generally a reaction device such as a ball mill, tube mill, vibration mill, bead mill, etc. is used to minimize the force as much as possible. The reaction is carried out at a temperature, generally below 70°C, especially between 15 and 50°C. Examples of amorphous silica include white carbon, other wet process amorphous silica, smectite clay minerals such as acid clay,
Silica obtained by acid-treating clay minerals such as montmorillonite and frass earth is used. This amorphous silica generally has a BET specific surface area of 150 to 400 m'/g, and its secondary particle diameter is 1 to 10 μI,
In particular, the thickness is preferably in the range of 1 to 5 μm. Calcium hydroxide should preferably have as high reactivity as possible, and what is generally called milk of lime has a CaO content of 4 to 81i.
are used. Although the mechanochemical reaction time varies depending on the capacity of the mill, the grinding conditions, etc., the conditions are generally selected from a range of 6 to 80 hours so that microcrystalline calcium silicate hydrate having the above characteristics is produced. After the reaction, the resulting product is filtered, washed with water, and dried if necessary.

The microcrystalline silicate of the present invention may be pre-contained with plasticizers, lubricants, antistatic agents, antifogging agents, ultraviolet absorbers, antioxidants, insect repellents, insect repellents, antibacterial agents, fragrances, colorants, medicinal ingredients, etc. It can also be used by supporting an organic component. Furthermore,
This compounding agent includes various metal soaps, waxes, resins, surfactants, and fillers supporting the various organic components mentioned above.
It is also possible to perform surface treatment in advance with various coupling agents. The organic component used for supporting and surface treatment is preferably in the range of 1 to 10% by weight, particularly 2 to 8% by weight, based on the microcrystalline silicate.

The filler of the present invention takes advantage of the above-mentioned properties and can be used with various resins, such as polypropylene, low-medium-1 high density or linear low density polyethylene, crystalline propylene-ethylene copolymers, ionic crosslinking. Olefin resins such as olefin copolymers, ethylene-vinyl acetate copolymers, and ethylene-acrylic ester copolymers: Thermoplastic polyesters such as polyethylene terephthalate and polybutylene terephthalate = 6-nylon, 6.6-nylon, 6 ．．
8- Polyamide such as nylon: Chlorine-containing resins such as vinyl chloride resin and vinylidene chloride resin/polycarbonate:
Polysulfones: Can be used to blend into thermoplastic resins such as polyacetal to improve their stability, especially thermal stability, or to provide slip or anti-blocking properties to resin molded products. . Also,
Mixed with a kneaded composition or liquid composition for coating formation,
Anti-blocking properties can be imparted to the coating.

For this purpose, the formulations of the invention can be incorporated in amounts of 0.5 to 100 parts by weight, in particular 1 to 10 parts by weight, per 100 parts by weight of resin.

(Effects of the Invention) Since the microcrystalline calcium silicate according to the present invention has a unique crystal structure, particle structure, and refractive index, it does not increase the haze of the resin even when blended with the resin, and can be used to form a film. It offers the advantage of maintaining a high level of transparency in resin molded products such as. In addition, although this microcrystalline calcium silicate hydrate is a crystal, it has a relatively large surface area, has excellent reactivity with hydrogen chloride, chlorine ions, etc., and has a remarkable effect of stabilizing the resin. In addition, unlike amorphous minerals, it is chemically and physically stable, and its secondary particle structure is also stable and resistant to agglomeration, so it has excellent dispersibility in resins, and secondary particles Due to the stability of the structure, anti-blocking properties can be imparted effectively and stably when incorporated into a film or the like.

Example 1 A resin formulation comprising a fine powder of microcrystalline calcium silicate hydrate according to the present invention (hereinafter referred to as C5H)
In order to prepare silica raw material, clay mineral acid clay (
C3H obtained using acid-treated layered silica (activated silicic acid) produced in Kushihiki-cho a), Yamagata Prefecture will be described below.

CSH production method and its physical properties Reagent Calcium oxide (Ca0 min, 9949%) 170.
6 g was placed in a beaker at 3° C., 2670 g of distilled water was added thereto, and hydration was carried out with stirring to obtain a milk of lime slurry containing 0 and 6% Ca. Next, 375g of this milk of lime
(Ca0 min, 22.4 g) and 46 g of active silicic acid powder with an average particle size of 5 μm (Sio2 content, 93.2 g) were placed in an IJ2 bot mill along with magnetic balls, and a grinding reaction was carried out for 24 hours. After filtration and water washing, It was dried at 110°C and then ground in a small sample mill to obtain C3H of the present invention (sample N0C5-1). Note that C5H obtained in the same manner by a 48-hour trituration reaction was designated as material NoC5-2.

Next, the physical properties shown below were measured and the results are shown in Table Mi.

Measurement method (1) X-ray diffraction Using the RAD-IB system manufactured by Rigaku Denki, Cu-
Measured at α.

Target Cu Filter Ni Detector SC Voltage 30KVP current
15mA Count Full Scale 100Oc/S Smoothing Point 15 Scanning Speed 1°/min Step Sampling 0.02” Slit O51
°R50, 15mm SSI viewing angle
6 (2) Lamination irregularity index (Is) α, - for Rigaku Denki's RAD-IB system and the company's product
Using α2 separation computer software V, 3.14,
Measured at α1 for Cu.

Target Filter Detector Voltage Current Count Full Scale Cu Ni SC 40 to vP 0mA 2000C/S Smoothing Point Scanning Method Scanning Speed Irradiation Fixed Time Step Sampling Plot Size Slit Glancing Angle Measurement Diffraction Angle Range Above LL! Diffraction angle (2θ) obtained by the above X-ray diffraction: 29.0
Peak tangents (a, b) are drawn so that the absolute value of the slope is maximum on the narrow-angle side and wide-angle side of the peak at ~29.4°. Next, drop the perpendicular C from the intersection of the narrow-angle side peak tangent a and the wide-angle side peak tangent s, and make an angle θ between the tangent a and the perpendicular
1 and the tangent line and the perpendicular line C are determined, and the lamination irregularity index (■,) is determined using the following formula.

Step scan 0.5' 7m1n 10sec/' 0.01 3cm/deg DS l''''R50,15mm 551'm 27° ~ 30,5° (2θ) tanθ1 (3) Refractive index using Atsube's refractometer in advance A solvent with a known refractive index (α-
Bromnaphthalene, kerosene) are prepared. Next, according to Larsen's oil immersion method described below, several milligrams of the sample powder was taken on a slide glass, one drop of a 6-medium with a known refractive index was added, a cover glass was placed, the solvent was sufficiently immersed, and then an optical microscope was used. Determine by observing the movement of the Hetzke line.

If you immerse the powder in a liquid and observe the transmitted light with an optical R microscope, the boundary between the powder and the liquid will appear bright and shining. This is called the Becke line. At this time, when the tube of the microscope is moved up and down, this Bezke line moves B. When the tube is lowered, the bright line moves to the inside of the particle and the particle appears brighter, and when the tube is raised, the bright line moves to the outside and the particle appears darker; this is because the liquid has a higher refractive index than the powder. . The opposite phenomenon is observed when the refractive index of the powder is higher.

By measuring a suitable liquid and selecting one with a larger refractive index than the powder and the other with a smaller one, the refractive index of the powder can be determined as the intermediate value between the refractive indices of these two types of liquids.

(4) Average particle size Scanning electron microscope WET-5 manufactured by Akashi Beam Technology ■
Using gM (WS-250), the particle diameter (μff1) of each particle in the selected field image was arithmetic averaged to determine the number average particle diameter.

(5) Oil absorption amount Measured according to JISK-51 (11-19).

(6) Specific surface area Sorptomatic 5erie manufactured by Carlo Erba
It was measured by the BET method using s 1800.

(7) Constants
According to the chemical analysis method of soda-lime glass of 101, 5
Measure the molar ratio of in2/Cab, H20/CaO and
and n were calculated.

(8) -order particle size BET specific surface area S A (m'/g) and -order particle size D
(nm) is known to have the following relationship due to Ra1ph K, l1er'', and D (nm) is calculated from this relational expression.

2ph 0O 5A= *: Ra1ph K, 11er, The Co1
1oid Chemistry of Silica
and 5ilicates, Cornell
University-city Press (1955) Example 2 Commercially available white carbon with an average particle size of 3 pa+ (Carplex #80.5 iOz, manufactured by Geotsugi Pharmaceutical Co., Ltd.) was used as a silica raw material.
5%;
．． Sample NoC5-1 of Example 1 except that 4g) was used.
It was carried out in the same manner as above, and white fine powder CSH (sample NoC5-
3) was obtained.

In addition, C5H obtained in the same 48-hour grinding reaction was used as sample No.
CS-4 and the physical properties are shown in Table 1.

Example 3 Sample C5 of Example 1 except that the silica raw material was a silica hydrogel slurry obtained by filtering and washing a silica hydrogel obtained by simultaneous addition of a commercially available sodium silicate solution and sulfuric acid, and then pulverizing it with a wet mill. C5H (sample No. CS-5) was prepared in the same manner as in Example 1, and its physical properties are shown in Table 1.

Comparative Example 1 In Example 1, without performing the milling reaction using a pot mill,
A fine white powder (sample NoH-1) was obtained in the same manner as in Example 1, except that the slurry of activated silicic acid and milk of lime was reacted in a 1-liter beaker at 95° C. for 6 hours with stirring.

Comparative Example 2 A slurry of commercially available white carbon and milk of lime used in Example 2 was reacted in the same manner as in Comparative Example 1 to obtain a white fine powder (Sample NoH-2).

Comparative Example 3 50 g of reagent lime sand and 450 g of distilled water were placed in a 1iL bottom mill together with a Korean ball (2 cm in diameter), wet-pulverized, filtered, dried at 110°C, and then crushed in a tabletop small sample mill to obtain number-average particles. Diameter 2μca, 5102 content 98% (110℃ dry matter standard, JIS R3101)
A fine quartz powder was obtained.

It was placed in a IIl autoclave container with 750 g of distilled water, and heated at 180°C under stirring conditions of 500 rpm.
A time hydrothermal synthesis reaction was carried out. After cooling, the reaction product was taken, filtered, washed with water, dried at 110°C, and then ground in a small sample mill to obtain a white fine powder (sample NoH-3).

When this sample was subjected to X-ray diffraction, it was found that the crystal structure belonged to 11 tobermorite, and it was not C3H of the present invention.

Application Examples 1 to 5 The calcium silicate samples obtained in Examples 1 to 5 and Comparative Examples 1 to 3 were mixed with hard and soft chlorine-containing polymers (pv
c), ethylene vinyl acetate copolymer (EVA), ethylene ethyl acrylic acid ester copolymer (EEA) and polyethylene (PE) resin, respectively, to obtain C of the present invention.
The transparency, heat resistance and anti-blocking properties of 5H were evaluated and the results are shown in Tables 2 to 6.

Preparation and physical property evaluation of various resin sheets (1) Rigid vinyl chloride sheet (PVC sheet) No.-PV
ctoo weight part stabilizer NL-120 (Suiun Kagaku Kogyo ■
Mg-Zn soap stabilizer) 2.5 PHR and sample 1.0 PHR were added, kneaded for 5 minutes at 170°C with a 3.5-inch roll, and then press-molded at 185°C for 5 minutes to 2ml 1l.
! A thick sheet was produced.

(2) Soft vinyl chloride sheet (PvC sheet) No.-PV
100 parts by weight of C and plasticizer D OP 50P) IR.

Stabilizer NL-120 (manufactured by Suiun Kagaku Kogyo ■) 2.5pH
R, add 2.0 PHR of sample and incubate at 150°C for 5 minutes 3
．． After kneading with a 5-inch roll, the mixture was press-molded at 1° C. for 5 minutes to produce a 2-inch thick sheet.

(3) Ethylene-vinyl acetate copolymer sheet (EVA sheet) A sample of 4.0 PHR was added to El/A with a vinyl acetate content of 28 and a melt index of 150 g/win manufactured by Mitsubishi Yuka ■, and heated to 110°C with a 3.5-inch roll. After 5 minutes of kneading 1
Press molding was performed at 60°C for 5 minutes to produce a 2 mm thick sheet.

(4) Ethylene ethyl acrylic acid copolymer sheet (EE
A) Sample 4.0P on sheet Mitsui/DuPont Chemical EEA)
After kneading with 3.5-inch rolls for 5 minutes at 110° C. with IR@, press molding was performed at 160° C. for 5 minutes to produce a 2) thick sheet.

(5) Polyethylene sheet (PE sheet) A 2 mm thick sheet was produced by molding low density polyethylene made by Idemitsu Petrochemical under the same conditions as sample 4.0 PHR1.

(6) Blank sample; shows a blank sheet to which calcium silicate is not added.

(7) Heat resistance performance A test sheet was placed in a gear oven at 185°C, and the heat resistance performance was expressed as the time until the sheet deteriorated due to heat.

(8) Transparency The transparency of a blank sheet not containing a calcium silicate sample and a sheet containing a sample are visually compared and determined.

O Transparent, × Opaque (9) Anti-blocking effect In accordance with JIS Z 15146.7, the polymerized seta sheet was placed in a constant temperature bath at 75°C for 5 hours under a load of 4 kg, then returned to room temperature, and the sheet was peeled off to determine the presence or absence of adhesion. Find out.

With adhesive Low anti-blocking effect Without adhesion Soft PVC sheet with high anti-blocking effect (Application example 2) Table 3 Hard PVC sheet (Application example 1) Table 2 EVA sheet (
Application example 3) Table 4 EEA sheet (Application example 4) Table 5 PE sheet (Application example 5) Table 6 Example 4 Sample No. of Example 1 1000 g of CSH slurry synthesized in the same manner as CS-1 Taking 21 be forces,
Heat to 60°C while stirring, add 3g of stearic acid, and add about 1
．． After stirring for 5 hours, the mixture was filtered, washed with water, and dried at 90°C to obtain fatty acid-coated CSH powder.

When this compound was blended in the same manner as Application Example 2 and Application Example 5, it was easily dispersed into the resin matrix, and
It has been found that it not only improves transparency, but also prevents plate-out during processing, improves roll die releasability, and promotes gelation, thereby further improving practical value.

[Brief explanation of the drawing]

FIG. 1 is an X-ray diffraction spectrum of the microcrystalline calcium silicate hydrate obtained in Example 1 of the present invention using α-rays in Cu-. Figure 2 shows the X-ray effect of α rays on Cu- of 11-man tobermorite.
i diffraction spectrum. FIG. 3 is a scanning electron micrograph showing the particle structure of the microcrystalline calcium silicate hydrate obtained in Example 1 of the present invention at a magnification of 10,000 times. FIG. 4 is a scanning electron micrograph at a magnification of 10,000 times showing the grain structure of 11-man tobermorite. FIG. 5 is an enlarged diagram of the diffraction peak near d=3.08 in the Cu-α-ray X-ray diffraction spectrum of the microcrystalline calcium silicate hydrate obtained in Example 1 of the present invention. θ for calculating the irregularity index (Is)
This is a diagram illustrating how to obtain hθ2. Mizusawa Chemical Industry Co., Ltd. Figure 5

Claims (4)

[Claims] (1) As a main component, it has a chemical composition represented by the formula CaO・xSlO_2・nH_2O, where x is a number from 1.0 to 2.0, and n is a number from 0.3 to 1.0. The surface spacing is 3.04 to 3.
08 Å, 2.78-2.82 Å and 1.81-1.
It has an X-ray diffraction peak at 84 Å, and 1.49 to 1.
A compounding agent for resin, characterized in that it consists of microcrystalline calcium silicate hydrate having a refractive index of 57. (2) The following formula Is=tanθ_2/tanθ_1' where θ_1 is the angle between the peak perpendicular to the X-ray diffraction peak with interplanar spacing of 3.04 to 3.08 Å and the tangent to the peak on the included angle side, and θ_2 is the tangent to the peak. The compounding agent for a resin according to claim 1, comprising a microcrystalline calcium silicate hydrate having a stacking irregularity index (Is) defined by: 1.75 or more, which represents the angle formed by the tangent line of the peak on the wide-angle side. (3) Microcrystalline calcium silicate hydrate has a number average particle diameter of 0.1 to 10μ, an oil absorption amount of 50 to 250ml/100g, and 60 to 200m^ under an electron microscope.
Claim 1 characterized in that it has a specific surface area of 2/g.
Compounding agent for the resin described. (4) Formula CaO・xSiO_2・nH_2O In the formula, x is a number from 1.0 to 2.0, and n is a number from 0.3 to 1.0. 3.04 to 3.
08 Å, 2.78-2.82 Å and 1.81-1.
It has an X-ray diffraction peak at 84 Å, and 1.49 to 1.
Microcrystalline calcium silicate hydrate with a refractive index of 57.