JP2639564B2 - Inorganic powder for unsaturated polyester resin and molded product of unsaturated polyester resin - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an inorganic powder for an unsaturated polyester resin and a molded article containing the same, and more particularly, to an unsaturated polyester resin containing a fatty acid sorbitan ester and / or a fatty acid. The present invention relates to an inorganic powder for an unsaturated polyester resin, which improves the processability by blending an inorganic powder surface-treated with sorbitan ester ether and improves the quality of a molded product, and a molded product containing the same. .

[Conventional technology and problems]

Heretofore, inorganic powders such as heavy calcium carbonate have been widely used in this field for the purpose of improving workability and quality. However, most of these inorganic powders have not been subjected to surface treatment, and even if surface-treated, they are not in a sufficiently satisfactory state in terms of processability and quality improvement.

The purpose of blending the inorganic powder with the unsaturated polyester resin is to improve processability and quality, but specifically involves the following problems.

First, in terms of workability, first, the greater the number of blending parts of the inorganic powder, the better the dimensional stability during warm molding. However, when the number of parts of the inorganic powder increases, the viscosity of the compound increases, and the inorganic powder cannot be sufficiently dispersed. In addition, when molding sheet molding compound (SMC) with glass fiber interposed, if the viscosity of the compound is high, the resin is not sufficiently impregnated into the glass fiber and voids are formed, and the desired good SMC molded product Can not be obtained.

On the other hand, regarding the quality, by mixing the inorganic powder, good surface hardness and smoothness of the molded product can be obtained. Also in this case, the surface hardness of the molded article increases as the number of the inorganic powders increases. The smaller the particle size of the inorganic powder and the lower the viscosity of the compound, the better the smoothness of the molded product. However, the smaller the particle size of the inorganic powder, the higher the compound viscosity. That is, in order to improve the processability and the quality of a molded product, it is necessary to mix a large amount of particles having a small particle size, but on the other hand, there is a trade-off relationship that the viscosity increases and the desired purpose cannot be achieved.

From the above, the ideal compounding in this field is to mix as many parts of powder as possible in the smallest possible particle size and not to increase the compound viscosity. However, the fact is that an inorganic powder that satisfies such a demand has not yet been proposed.

[Means for solving the problem]

The present inventors have conducted intensive studies in view of such circumstances, and as a result, have found that the above problems can be solved by using an inorganic powder surface-treated with a fatty acid sorbitan ester and / or a fatty acid sorbitan ester ether. completed.

That is, the first aspect of the present invention is to provide an inorganic powder for unsaturated polyester resin, wherein the surface of the inorganic powder is treated with at least one surface treating agent selected from fatty acid sorbitan ester and fatty acid sorbitan ester ether. The second aspect of the present invention relates to an unsaturated polyester resin molded article containing an inorganic powder treated with at least one surface treatment agent selected from fatty acid sorbitan esters and fatty acid sorbitan ethers. Is what you do.

As the inorganic powder in the present invention, calcium carbonate,
Examples include talc, clay, mica, and alumina.

The surface treating agent used in the present invention is sorbitan ester and sorbitan ester ether, and specifically, sorbitan monolaurate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate Sorbitan ester ethers such as sorbitan esters such as ethate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate.

The surface treatment amount is 0.01 to 5.0% by weight, preferably 0.1 to 2.0% by weight, based on the inorganic powder. As the surface treatment method, either dry treatment or wet treatment may be used, but dry treatment is more economically preferable. As a specific dry treatment method, it is preferable to stir the inorganic powder with a Henschel mixer or the like and to add the surface treatment agent under a heated condition.

The unsaturated polyester resin used in the present invention is not particularly limited.For example, unsaturated acids such as maleic acid and fumaric acid, phthalic anhydride, an organic acid composed of a saturated polybasic acid such as isophthalic acid, propylene glycol, A commercially available liquid resin obtained by dissolving an esterification product with a polyhydric alcohol such as ethylene glycol or bisphenol A in a polymerizable monomer such as a styrene monomer can be used.

The upper limit of the amount of the surface-treated inorganic powder to be added to the unsaturated polyester resin is preferably about 220 parts by weight based on 100 parts by weight of the unsaturated polyester resin. If the amount exceeds 220 parts by weight, the viscosity of the compound increases, which is not preferable. As the curing agent, those generally used for unsaturated polyester resins may be used,
Various commonly used additives may be added.

The resin composition of the present invention, in addition to the above SMC, bulk
Molded by various molding methods such as molding compound (BMC), spray-up, casting, filament winding, and pultrusion.

A molded product containing the inorganic powder of the present invention has a surface hardness,
Since it has excellent dimensional stability and surface smoothness, it is used in the construction field such as bathtub, septic tank, corrugated board, ship field such as boat and yacht, automobile field such as body and instrument panel, and chemical industry field such as tank and pipe. The present invention is suitably applied to a wide range of fields such as fishing poles, sports equipment such as skiing, and the like.

[Action / Effect]

Although the mechanism of action of the fatty acid sorbitan ester and sorbitan ester ether in the present invention is not always clear, these compounds bind to the surface of the inorganic powder to modify the surface of the inorganic powder and have an affinity for the unsaturated polyester resin. Is thought to be due to the increase in As a result, even if a high number of inorganic powders are blended, the compound viscosity does not increase,
Processability is good, and a molded article having desired quality can be obtained.

The unsaturated polyester molded article is mainly used for home building materials (bath tubs and the like) and automobile parts. In recent years, the use of the latter as an automobile part has been rapidly increasing. When used for automotive parts, it requires an excellent aesthetic appearance obtained by improving physical strength mainly of rigidity and surface smoothness. The required performance can be obtained by blending as high a proportion of inorganic powder as possible. When taking conventional inorganic powder, for example, calcium carbonate as an example, about 150 parts by weight of calcium carbonate relative to 100 parts by weight of the unsaturated polyester resin is the limit compounding when judged from the compound viscosity and the smoothness of the molded product. It was a copy. However, if the surface-treated calcium carbonate of the present invention, 18
Not only can it be blended in an amount of about 0 to 220 parts by weight, but also finer particles can be blended in a higher number of parts than in the past, so that rigidity and surface smoothness are excellent.

〔Example〕

Hereinafter, the present invention will be described more specifically with reference to Examples, but it goes without saying that the present invention is not limited thereto.

Example 1 Heavy calcium carbonate having a specific surface area of 8000 cm ² / g as measured by an air permeation method was subjected to a surface treatment of 0.5% by weight of heavy calcium carbonate with sorbitan monolaurate using a Henschel mixer.

Example 2 In Example 1, all operations were the same as in Example 1, except that heavy calcium carbonate having a specific surface area of 15000 cm ² / g was used.

Example 3 Example 1 was repeated except that polyoxyethylene sorbitan monolaurate was used as the surface treatment agent.
The same operation was performed.

Comparative Example 1 In Example 1, all operations were the same as in Example 1, except that the surface treatment was not performed with sorbitan monolaurate.

Comparative Example 2 In Example 2, all operations were the same as in Example 2, except that the surface treatment was not performed with sorbitan monolaurate.

Using the inorganic powders obtained in Examples 1 to 3 and Comparative Examples 1 and 2, they were mixed in the following composition and the compound viscosity was measured. Further, the glass article was actually impregnated with the glass fiber and subjected to SMC molding, and the surface smoothness of the molded article was visually judged. Table 1 shows the obtained results.

Formulation 1: 100 parts by weight of unsaturated polyester resin (Polymer 6819 manufactured by Takeda Products Co., Ltd.) 150 parts by weight of inorganic powder Formulation 2: 100 parts by weight of unsaturated polyester resin 200 parts by weight of inorganic powder From the above, it can be seen that the unsaturated polyester resin composition of the present invention has a lower compound viscosity and superior surface smoothness of the molded product as compared with the conventional product.

Claims (3)

(57) [Claims] 1. An inorganic powder for an unsaturated polyester resin, wherein the surface of the inorganic powder is treated with at least one surface treating agent selected from fatty acid sorbitan ester and fatty acid sorbitan ester ether. 2. The inorganic powder according to claim 1, wherein the inorganic powder is at least one selected from calcium carbonate, talc, clay, mica and alumina. 3. An unsaturated polyester resin molded article comprising an inorganic powder treated with at least one surface treating agent selected from fatty acid sorbitan esters and fatty acid sorbitan ethers.