JPH08864B2 - Porous cross-linked polyester bead lightening material and lightening composition containing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a porous crosslinked polyester bead lightweighting material and a lightweighting composition containing the same.

[0002]

2. Description of the Related Art Recently, there has been a strong demand worldwide to reduce the weight of automobiles due to the relationship between fuel consumption and air pollution. In addition, enormous expenses are currently invested in research and development for how to reduce the weight of materials, from structures to large and small parts.

The same tendency is observed not only in automobiles but also in transportation such as aircrafts, vehicles, and bicycles.
Moreover, in daily life, the wave of weight reduction is also rushing to household products, footwear, clothes, toys, and even building materials.

At present, these research and development activities have been strongly carried out and achieved to some extent, but they are still insufficient.
There is a strong demand for lightweight materials.

In order to reduce the weight, it is common to replace a material having a large specific gravity with a material having a small specific gravity. For example, iron is replaced with aluminum, and further plastic is used. Also, glass is being replaced with transparent plastic.

Another alternative is to foam the material, or
Alternatively, it is a method of injecting air, and foamed cement (L
AC), sponge rubber, expanded plastic, and lightweight newspapers are common materials. As a method similar to this, there is also a method of mixing a weight-reducing material with a specific material.

Powders having voids inside have been known as a weight-reducing material, and silica balloons such as silica balloons, glass balloons, shirasu balloons and gallolite are known. These silica-based balloons are formed from an inorganic material containing silica as a main component.

As a weight-reducing material formed of an organic material,
Hollow or porous thermoplastic resin beads formed from thermoplastic resins such as vinyl acetate, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, styrene, and vinylidene chloride are known.

[0009]

However, silica-based balloons have a problem that the balloons are destroyed when they are compounded and kneaded with plastics and rubbers, and the function as a weight reducing material cannot be achieved.

The porous thermoplastic resin beads are heated and kneaded in order to mix them with plastics and rubber, but in that case, the beads are deformed or melted by heat, and the function as a weight reducing material cannot be achieved. There was a problem.

The present invention solves the above-mentioned conventional problems, and provides a lightweight material which is neither deformed nor melted by heat and whose bubble structure is not destroyed during the mixing step. Especially.

[0012]

The lightweight material of the present invention is
Alkaline earth metal oxide and / or in the oil phase consisting of unsaturated polyester and vinyl monomer capable of cross-linking it
Alternatively, a porous crosslinked polyester bead formed by redispersing a water-in-oil emulsion formed by dispersing an aqueous suspension of a hydroxide in an aqueous solution of a suspension stabilizer to crosslink and cure it, and then drying this. It is a lightweight material.

The particle diameter of the bead lightening material of the present invention is 5
The thickness is preferably 1 μm to 1 mm, more preferably 50 to 200 μm.

If the particle size is smaller than 5 μm, the particles agglomerate and it becomes difficult to finish them as powders, which makes the handling troublesome. When the particle size is larger than 1 mm, in the step of mixing with the object to be lightened,
The void structure of the lightweight material may be destroyed.

The bead weight reducing material of the present invention has a porosity of 2
It is preferably 0 to 90% by volume, and more preferably 40 to 80% by volume. If the porosity is less than 20% by volume, the effect of weight reduction may not be sufficiently obtained, and if it exceeds 90% by volume, the void structure of the weight-reducing material is likely to be destroyed.

The bead weight-reducing material of the present invention is obtained by drying in the final step, but it is preferable to dry it to a water content of 5% or less.

The bead weight-reducing material of the present invention is characterized in that the number of pores on the surface is small as compared with the internal porosity. Since the number of holes on the surface is small as described above, it is possible to prevent the object to be lightened from entering the inside of the hole, and it is possible to sufficiently exert the effect of further weight reduction.

The bead weight-reducing material of the present invention is formed by dispersing an aqueous suspension of an alkaline earth metal oxide and / or hydroxide in an oil phase composed of an unsaturated polyester and a vinyl monomer. The obtained water-in-oil emulsion can be obtained by redispersing the emulsion in an aqueous solution of a suspension stabilizer to crosslink and cure it, and then drying it.

The unsaturated polyester used as a raw material for the bead weight-reducing material of the present invention is not particularly limited and includes, for example, α, β-unsaturated acid or a mixture thereof and a dihydric alcohol. Examples thereof include those obtained by polymerizing a trihydric alcohol.

Examples of unsaturated acids include fumaric acid,
Maleic acid, itaconic acid, etc., as the saturated acid, for example, phthalic acid, terephthalic acid, succinic acid, glutaric acid,
Examples include tetrahydrophthalic acid, adipic acid, sebacic acid, and the like.

Examples of dihydric alcohols and trihydric alcohols include ethylene glycol, diethylene glycol, propylene glycol, neopentyl glycol, 1,3-propanediol, 1,6-hexanediol and trimethylolpropane.

The acid value of the unsaturated polyester is not particularly limited, but considering the stability of the water-in-oil emulsion,
It is preferable to use an unsaturated polyester having an acid value of about 5 to 30 mg KOH / g.

The vinyl monomer as a raw material for the bead weight reducing material of the present invention is not particularly limited, and examples thereof include styrene, chlorostyrene, vinyltoluene, divinylbenzene, acrylic acid, methyl acrylate, acrylonitrile, ethyl acrylate. , And diallyl phthalate.

The mixing ratio of the unsaturated polyester and the vinyl monomer is not particularly limited, but usually 50 to 200 parts by weight of the vinyl monomer may be added to 100 parts by weight of the unsaturated polyester.

The alkaline earth metal oxide and / or hydroxide (hereinafter referred to as "alkaline earth metal salt") added to the unsaturated polyester and the vinyl monomer as an emulsifier is not particularly limited, Examples thereof include magnesium oxide, calcium oxide, barium oxide, strontium oxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, and strontium hydroxide.

The amount of the alkaline earth metal salt used is not particularly limited, but is usually 0.01 to 2 per 100 parts by weight of the oil phase.
It may be about 0 parts by weight, preferably about 0.1 to 5 parts by weight. The amount of water used for suspending the alkaline earth metal salt may be about 10 to 800 parts by weight, preferably about 50 to 400 parts by weight, based on 100 parts by weight of the oil phase.

The method of suspending the alkaline earth metal salt in water is not particularly limited, and it may be sufficiently suspended using, for example, a ball mill or a high speed stirrer.

In order to form a water-in-oil emulsion by adding an aqueous suspension of an alkaline earth metal salt to the oil phase, a general method such as stirring can be adopted. For example, an aqueous suspension of an alkaline earth metal salt may be gradually added to the oil phase and vigorously stirred with a disper mill, a colloid mill or the like. The stirring speed is not particularly limited, but the peripheral speed of the stirring blade is usually 10
It is about 60 to 60 m / sec, preferably about 15 to 30 m / sec.

Examples of the suspension stabilizer for redispersing the water-in-oil emulsion include polyvinyl alcohol, partially saponified polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose and the like.

The suspension stabilizers can be used alone or as a mixture of two or more kinds. The concentration of the suspension stabilizer in the aqueous solution may be appropriately selected according to the particle diameter of the target porous polyester resin particles and the like, but is usually about 0.1 to 10% by weight.

The stirring speed at the time of redispersing the water-in-oil emulsion in the aqueous solution of the suspension stabilizer may be appropriately selected depending on the particle diameter of the porous crosslinked polyester bead lightweighting material to be obtained. it can. Generally, when the stirring speed is high, a small particle size is obtained, and when the stirring speed is low, a large particle size is obtained.

The method of crosslinking and hardening the water-in-oil emulsion in the redispersion can be carried out by a usual method. For example, a polymerization initiator may be added to crosslink and cure the redispersion while stirring. As the polymerization initiator, those used as a polymerization initiator for the unsaturated polyester resin can be used. Specifically, for example, organic peroxides such as benzoyl peroxide, methyl ethyl ketone peroxide, cumene peroxide and t-butyl peroxide, inorganic peroxides such as ammonium persulfate, sodium persulfate and potassium persulfate, and methyl ethyl ketone peroxide. Examples thereof include redox polymerization initiators such as oxide-cobalt organic acid salts and cumene hydroperoxide-cobalt organic acid salts.

The polymerization initiator may be added in the oil phase of the unsaturated polyester and the vinyl monomer. Again 2
As for the redox-based polymerization initiator composed of the components, one component may be added to the oil phase and the other component may be added to the redispersion.

The amount of the polymerization initiator used is not particularly limited, but it is usually 0.5 to 5 parts by weight per 100 parts by weight of the oil phase. Although the polymerization temperature is not particularly limited, it is usually about 10 to 40 ° C. The stirring speed is also not particularly limited, but the peripheral speed of the stirring blade is usually about 1 to 10 m / sec.

Drying after crosslinking and curing can be generally performed by heat drying. The heating temperature is not particularly limited, but it is usually about 80 to 120 ° C.

The object to be lightened by mixing the bead weight-reducing material of the present invention is not particularly limited, but for example, fiber reinforced unsaturated polyester resin such as SMC and BMC, oil clay and paper clay, Adhesives, sealants, synthetic wood, plastic concrete such as artificial marble, cement concrete, paste PVC molded products such as flooring and wallpaper, carpet backing materials,
It can be added to buoyancy materials such as buoys, paper boards, ceiling materials, plastic molded products and rubber molded products to reduce the weight.

When blended with the fiber reinforced unsaturated polyester resin, the bead weight-reducing material of the present invention is blended in an amount of 5 to 1000 parts by weight, preferably 10 to 500 parts by weight, based on 100 parts by weight of the unsaturated polyester resin. preferable. If the amount is less than 5 parts by weight, the effect of sufficiently reducing the weight cannot be obtained, and if the amount is more than 1000 parts by weight, the viscosity of the unsaturated polyester resin composition becomes high and molding becomes difficult.

When the bead lightening material of the present invention is added to the oil clay, the bead lightening material of the present invention is 5 to 500 parts by weight, more preferably 10 to 100 parts by weight of the oil clay.
It is preferable to add 300 parts by weight. If the amount is less than 5 parts by weight, the effect of reducing the weight cannot be sufficiently obtained, and if the amount is more than 500 parts by weight, the viscosity of the oil clay becomes high and it becomes difficult to make the work.

When the bead weight-reducing material of the present invention is added to the adhesive, 5 to 200 parts by weight, more preferably 10 to 150 parts by weight of the bead-lightening material of the present invention is added to 100 parts by weight of the adhesive. Preferably. If it is less than 5 parts by weight, the effect of sufficiently reducing the weight cannot be obtained, and if it is more than 200 parts by weight, the adhesive strength is lowered.

When the bead weight-reducing material of the present invention is added to a thermoplastic resin, the bead-lightening material of the present invention is 5 to 500 parts by weight, and more preferably 10 to 300 parts by weight, relative to 100 parts by weight of the thermoplastic resin. It is preferable to mix them in parts. If the amount is less than 5 parts by weight, the effect of sufficiently reducing the weight cannot be obtained, and if the amount is more than 500 parts by weight, the strength of the thermoplastic resin molded article decreases.

When the bead weight-reducing material of the present invention is added to rubber, the bead-lightening material of the present invention is 5 to 300 parts by weight, more preferably 10 parts by weight, relative to 100 parts by weight of the rubber.
It is preferable to mix it in an amount of up to 200 parts by weight. If the amount is less than 5 parts by weight, the effect of sufficiently reducing the weight cannot be obtained, and if the amount is more than 300 parts by weight, the strength of the rubber molded product decreases.

[0042]

The bead weight-reducing material of the present invention has a large number of small bubbles of about 0.2 to 2 μm therein.
Further, since the material is a cured product of an unsaturated polyester resin, its structure is not destroyed unlike the conventional silica balloon even in the step of mixing with the object of weight reduction.

Since it is composed of a cross-linked cured product of unsaturated polyester, it is not deformed or melted by heating and kneading unlike the beads formed of conventional thermoplastic resins.

Therefore, the bead weight-reducing material according to the present invention, when mixed with plastic, rubber, paper board, adhesive or the like, exerts an excellent weight-reducing effect which has never been obtained.

Further, in the case of the conventional silica type balloon, when the structure of the balloon is destroyed, the material mainly contains silica. Therefore, if it is mixed with oil clay or paper clay, for example, there is a possibility that the broken pieces may injure a finger or the like. However, the bead weight-reducing material of the present invention does not cause such breakage, and even if breakage occurs, since it is based on the unsaturated polyester resin, there is no risk of scratching a finger or the like.

Further, since the bead weight-reducing material of the present invention has a structure having a large number of small bubbles inside, it is possible to control the diameter of the small bubbles inside and the porosity thereof in a wide range, and various applications are possible. The bead lightening material that conforms to

[0047]

【Example】

Example 1 Unsaturated polyester resin [trade name: Epolak N-14
B, acid value 12, styrene content 40%, manufactured by Nippon Shokubai Co., Ltd.] 65 parts by weight, styrene 35 parts by weight and cobalt naphthenate (cobalt content 6% by weight) 0.4 parts by weight with a disper stirrer. While stirring at a peripheral speed of 3 m / sec, 1 part by weight of magnesium oxide was added to 300 parts by weight of water, and the water suspension dispersed in a ball mill for 3 hours was gradually added to obtain a water-in-oil emulsion. It was

Next, to this emulsion, 30% PVA (polymerization degree 2000, saponification degree 80%) 4.0% by weight aqueous solution was added.
Add 0 parts by weight, and propeller stirrer at a peripheral speed of 8 m / s to 1
Stirred for 0 minutes.

Further, 1.5 parts by weight of the curing catalyst MEKPO was added, and stirring was continued gently at 30 ° C. to obtain a slurry of unsaturated polyester particles.

The polyester particles were filtered, and the obtained polyester particle cake was dried at 105 ° C. for one day.
Water content 1.5%, particle size 15-150 μm, porosity 79%
A porous crosslinked polyester bead lightening material (hereinafter, this lightening material is referred to as "lightening material A") was obtained.

A commercially available unsaturated polyester resin (Rigolac M411, Showa Polymer Co., Ltd.) is used as the weight-reducing material A.
And 2 parts by weight of the curing catalyst BPO are added to 120 ° C.
And pressure-molded to obtain an unsaturated polyester resin lightweight composition.

As shown in Table 1, the compounding amount of the weight-reducing material A is 2, with respect to 100 parts by weight of the unsaturated polyester resin.
9, 30, 200, 500, 1200 parts by weight (Comparative Example 1-1, Inventive Examples 1-2 to 1-5, Comparative Example 1
-6).

Table 1 shows the specific gravity of the obtained unsaturated polyester resin and the destruction rate (%) of the filler. In addition, when 1200 parts by weight of the weight-reducing material A was mixed, cracks were generated in the molded product, and the unsaturated polyester resin composition could not be obtained.

Here, the destruction rate is a numerical value calculated by the following equation.

[0055]

[Equation 1]

Here, the calculated specific gravity A represents the specific gravity of the compounded composition in the case where a filler having voids such as microballoons is compounded in the composition and all the voids are broken, and the fracture rate is 100%. It shows the specific gravity when.

The calculated specific gravity B is the specific gravity of the compounded composition when the composition is compounded with a filler having cavities such as microballoons, that is, the fracture rate is 0.
The specific gravity is shown when%.

For comparison, heavy calcium carbonate was used in place of the weight-reducing material A, and an unsaturated polyester resin composition was prepared by mixing 100 parts by weight with 100 parts by weight of the unsaturated polyester resin. The destruction rate is shown in Table 1 (Comparative Example 1-7).

For comparison, instead of the lightweight material A,
30 parts by weight of a silica-based balloon Q-cel-300 (manufactured by Asahi Glass Co., Ltd., specific gravity 0.21) was blended to prepare an unsaturated polyester resin composition (Comparative Example 1-8). The specific gravity and destruction rate of this composition are shown in Table 1.

[0060]

[Table 1]

Example 2 Commercially available unsaturated polyester resin (Rigolac M411,
100 parts by weight of Showa Polymer Co., Ltd.) was mixed with 9 parts by weight or 30 parts by weight of the weight-reducing material A obtained in Example 1, 100 parts by weight of glass fiber and 2 parts by weight of curing catalyst BPO were added, and the mixture was heated at 120 ° C. It pressure-molded and the unsaturated polyester resin lightweight composition was obtained (Examples 2-1 and 2-2 of this invention). The specific gravity and destruction rate of the obtained composition are shown in Table 1.

As a comparison, an unsaturated polyester resin composition was obtained in which heavy calcium carbonate was used instead of the weight-reducing material A, and 100 parts by weight of 100 parts by weight of the unsaturated polyester resin was mixed (Comparative Example 2-3). . The specific gravity and destruction rate are shown in Table 1.

For comparison, instead of the lightweight material A,
8 parts by weight of silica-based balloon Q-cel-300 (specific gravity 0.21 manufactured by Asahi Glass Co., Ltd.) was blended to obtain an unsaturated polyester resin composition (Comparative Example 2-4). The specific gravity and destruction rate are shown in Table 1.

Example 3 In the production of the weight-reducing material A of Example 1, 300 parts by weight of water was changed to 100 parts by weight of water, and the other conditions were the same to obtain a slurry of porous crosslinked polyester particles. A cake obtained by filtering the polyester particles is dried at 105 ° C. for one day, and has a moisture content of 1.0%, a particle diameter of 20 to 130 μm, and a porosity of 49%. The chemical material was referred to as “lightweight material B”).

21 parts by weight of this weight-reducing material B was mixed with 100 parts by weight of a commercially available unsaturated polyester resin (Rigolac M411, Showa Polymer Co., Ltd.) and pressure-molded to obtain an unsaturated polyester resin weight-reducing composition. Was obtained (Example 3 of the present invention). Table 1 shows the specific gravity and destruction rate of the obtained resin composition.

As is clear from Table 1, when the lightening material according to the present invention is blended with the unsaturated polyester resin, the compounding amount of the lightening material according to the present invention relative to 100 parts by weight of the unsaturated polyester resin is 5 to 1000 parts by weight. It can be seen that parts are preferable, and more preferably 10 to 500 parts by weight.

Example 4 10 parts by weight of sericite was mixed in advance with the weight-reducing material A obtained in Example 1, and 10 parts by weight of liquid paraffin, 7 parts by weight of microcrystalline wax, 1.6 parts by weight of glycerin, and steer 1.0 parts by weight of calcium phosphate, 0.4 parts by weight of potassium soap and the like were mixed and heated at 50 to 70 ° C. to obtain a uniform liquid substance. This liquid substance and the mixed powder of sericite and the weight-reducing material A were mixed with a disintegrator and then with a kneader type stirrer at a temperature of 60 to 90 ° C. to prepare an oil clay composition.

The composition of the weight-reducing material A was 3 parts by weight and 2 parts by weight, respectively, relative to 100 parts by weight of the oil clay composition other than the weight-reducing material A.
3 parts by weight, 100 parts by weight, and 800 parts by weight were compounded (Comparative Example 4-1, Invention Examples 4-2 and 4).
-3, Comparative Example 4-4).

For comparison, instead of the lightweight material A, Q
-Cel-300 to 100 parts by weight of the oil clay composition,
23 parts by weight were compounded to prepare an oil clay lightweight composition (Comparative Example 4-5).

The destruction rate of the filler in the obtained oil clay composition is shown in Table 2.

[0071]

[Table 2]

Example 5 The lightening material A obtained in Example 1 and an epoxy resin (Epicoat 815, manufactured by Shell Petrochemical Co., Ltd.) were mixed to prepare an adhesive composition. The compounding amount of the weight-reducing material A was changed to be 2 parts by weight, 10 parts by weight, 150 parts by weight, and 300 parts by weight, respectively, with respect to 100 parts by weight of the epoxy resin (Comparative Example 5-1 and the present invention). Example 5-2
And 5-3, Comparative Example 5-4).

Adhesive composition 10 thus obtained
To 0 part by weight, 5 parts by weight of ethylenetriamine was added and cured, and after-curing was further performed at 60 ° C. for 1 hour.

The specific gravity and shear strength of the obtained adhesive composition are shown in Table 3. The shear strength is the shear strength (kg / cm) of the adhesive layer made of ferrous metal on both sides.

For comparison, heavy calcium carbonate instead of the weight-reducing material A was added to 10 parts by weight of 100 parts by weight of the epoxy resin.
An epoxy resin adhesive composition containing 0 parts by weight was prepared (Comparative Example 5-5). The specific gravity and shear strength of this adhesive composition are also shown in Table 3.

For comparison, a cured product of only the epoxy resin containing no compounded filler was prepared (Comparative Example 5-
6). The specific gravity and shear strength of this cured adhesive are also shown in Table 3.

[0077]

[Table 3]

Example 6 Unsaturated polyester resin (trade name: Polymer 9802,
Takeda Pharmaceutical Co., Ltd.] 60 parts by weight, styrene 40 parts by weight, and cobalt naphthenate (cobalt content 6%)
With stirring at a peripheral speed of 25 m / sec with a disper stirrer, was added hydroxide strike b Nchiumu 1 part by weight to 200 parts by weight of water, it was gradually added an aqueous suspension prepared by dispersing for 3 hours in a ball mill A water-in-oil emulsion was obtained.

Next, this emulsion was mixed with PVA (polymerization degree 2
000, saponification degree 80%, Wako Pure Chemical Industries, Ltd.) 3.0 parts by weight aqueous solution 160 parts by weight, and hydroxyethyl cellulose [trade name Natrosol 250HHR, manufactured by Hercules Co., Ltd.] 90% by weight aqueous solution. 1) at a peripheral speed of 10 m / sec using a propeller stirrer.
Stirred for 0 minutes.

Further, 1.5 parts by weight of the curing catalyst MEKPO was added, and the mixture was continuously stirred gently at 30 ° C. to crosslink and cure the unsaturated polyester to obtain a slurry of white porous crosslinked polyester particles.

A cake obtained by washing and filtering the polyester particles with water was dried at 120 ° C. for one day and night, and a cross-linked polyester bead lightweight material having a water content of 05%, a particle diameter of 10 to 50 μm and a porosity of 65% (hereinafter referred to as this lightweight material. Is referred to as "lightening material C").

This weight-reducing material C is made of a commercially available ABS resin (trade name JSR ABS 15, manufactured by Japan Synthetic Rubber Co., Ltd.).
After kneading with a hot roll at 180 ℃ for 5 minutes,
Was pressure-molded to obtain an ABS resin lightweight composition.

The blending amount of the lightening material C is 100% ABS resin.
1 part by weight, 20 parts by weight, 300 parts by weight,
And 700 parts by weight (Comparative Example 6-
1, Inventive Examples 6-2 and 6-3, Comparative Example 6-4).

Table 4 shows the specific gravity, fracture rate and tensile strength of the obtained ABS resin composition.

For comparison, instead of the weight-reducing material C, 30 parts by weight of thermoplastic balloon [trade name Matsumoto Microsphere F80ED, specific gravity 0.024, manufactured by Matsumoto Resin Co., Ltd.] was blended with 100 parts by weight of ABS resin. Then, pressure molding was carried out in the same manner as above except that an ABS resin molded product was obtained (Comparative Example 6-6). Table 4 also shows the specific gravity, fracture rate and tensile strength of this ABS resin composition.

In the above example, instead of 60 parts by weight of unsaturated polyester resin and 40 parts by weight of styrene, 50 parts by weight and 50 parts by weight, respectively, were added, and water 20
Instead of 0 part by weight, 960 parts by weight of water was used, and under the other conditions, a slurry of porous crosslinked polyester particles was prepared.

The slurry of the porous crosslinked polyester particles was filtered, and the obtained cake was dried at 120 ° C. for one day. As a result, the water content is 0.2%, the particle diameter is 20 to 80 μm,
A lightweight material for the porous crosslinked polyester beads having a porosity of 92% (hereinafter, referred to as "lightweight material D") was obtained.

ABS resin 1 was added to 5 parts by weight of this lightweight material D.
100 parts by weight of the mixture was kneaded with a hot roll at 180 ° C. for 5 minutes and then pressure-molded at 190 ° C. to obtain an ABS resin composition having a specific gravity of 1.00 (Comparative Example 6-5). Table 4 shows the specific gravity, fracture rate and tensile strength of the obtained ABS resin composition.

[0089]

[Table 4]

Example 7 The lightening material C obtained in Example 6 was used as EPDM (trade name EP
-21, manufactured by Japan Synthetic Rubber Co., Ltd.). The compounding amount is 1 part by weight and 2 parts by weight with respect to 100 parts by weight of EPDM, respectively.
It was blended so as to be 0 parts by weight, 200 parts by weight, and 400 parts by weight (Comparative Example 7-1, Inventive Examples 7-2 and 7).
-3, Comparative Example 7-4). 5 parts by weight of ZnO, 1 part by weight of stearic acid, 100 parts by weight of EPDM, and AccC
Z1 parts by weight, AccTT 1.5 parts by weight, AccBZ0.
5 parts by weight, 2 parts by weight of sulfur, and process oil (PW
-380) 15 parts by weight was added, and the mixture was roll-kneaded at a temperature of 60 ° C., and then pressure-molded at 160 ° C. for 10 minutes to obtain an EPDM lightweight composition.

Table 5 shows the specific gravity, fracture rate and tensile strength of the obtained EPDM composition. As a comparison, 30 parts by weight of Shirasu balloon (trade name Winlite, specific gravity 0.45, manufactured by Ichichi Kasei Co., Ltd.) was blended in place of the lightening material C, and an EPDM composition was prepared in the same manner as above ( Comparative Example 7-5). Table 5 shows the specific gravity, fracture rate and tensile strength of the obtained EPDM composition.

For comparison, an EPDM composition not filled with the compounding filler was prepared (Comparative Example 7-6). The specific gravity, fracture rate and tensile strength of this EPDM composition are also shown in Table 5.

[0093]

[Table 5]

Example 8 Various weight-reducing materials having a porosity of 10% to 92% were produced by appropriately changing the blending amount of unsaturated polyester resin and the amount of water. It was mixed with a resin (specific gravity 1.05).

The blending ratio was 30 parts by weight of the lightweight material based on 100 parts by weight of the ABS resin. The specific gravity of the obtained composition was measured, and the relationship between the specific gravity of the composition and the porosity of the lightweight material is shown in FIG.

As is apparent from FIG. 1, the weight-reducing effect is exhibited when the porosity of the weight-reducing material is about 30%, and the weight-reducing effect is sharply reduced when the porosity exceeds 90%.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the porosity of a lightweight material and the specific gravity of a composition containing the lightweight material.

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Claims (6)

[Claims] 1. An aqueous phase of an oxide and / or hydroxide of an alkaline earth metal dispersed in an oil phase composed of an unsaturated polyester and a vinyl monomer capable of crosslinking the polyester. The water-in-oil emulsion is redispersed in an aqueous solution of a suspension stabilizer, crosslinked and cured, and dried to obtain a particle size of 5 μm to 1 mm and a porosity of 30 to 90% by volume. A porous crosslinked polyester beet lightweight material. 2. An unsaturated polyester resin lightening composition comprising 100 parts by weight of an unsaturated polyester resin and 5 to 1000 parts by weight of the porous crosslinked polyester bead lightweighting material according to claim 1. Stuff. 3. The porous crosslinked polyester bead weight-reducing material according to claim 1 to 5 parts by weight per 100 parts by weight of oil clay.
An oil clay lightening composition, characterized in that it is blended in an amount of 00 parts by weight. 4. The porous cross-linked polyester bead weight-reducing material according to claim 1 to 5 parts by weight per 100 parts by weight of the adhesive.
An adhesive weight-reducing composition, characterized by being compounded in an amount of 00 parts by weight. 5. A thermoplastic resin weight-reducing composition, characterized in that 5 to 500 parts by weight of the porous crosslinked polyester bead weight-reducing material according to claim 1 is blended with 100 parts by weight of the thermoplastic resin. 6. The porous crosslinked polyester bead weight-reducing material according to claim 1 is added to 5 to 30 parts by weight of rubber.
A rubber weight-reducing composition, characterized by containing 0 part by weight.