JPS58168626A - Production of spherical polypropylene resin particle - Google Patents

Abstract

PURPOSE:To produce spherical PP resin particles capable of providing pre- expanded particles of a uniform shape, by dispersing PP resin particles in a dispersing medium with the aid of a specified dispersant and then heating the dispersion. CONSTITUTION:100pts.wt. PP resin particle having a weight below 6mg per particle and above 0.4pts.wt. at least one dispersant selected from the group consisting of basic magnesium carbonate, talc and Al2O3 are dispersed in at least 100pts.wt. dispersing medium (e.g., water), and maintained for at least 15min under agitation at temperatures ranging from the m.p. of the resin particles >=10 deg.C to the m.p. <=50 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing spherical polypropylene resin particles OIl.

Conventionally, foamed bodies have been manufactured using polystyrene, cross-linked polyethylene as materials, and the bead molding method using pre-expanded particles. on the other hand.

The polypropylene resin used in this application has mechanical strength.

Due to its excellent heat resistance, chemical resistance, oil resistance, etc., we have conducted research on the development of the foamed material, and as a result, we have developed a method for obtaining pre-expanded particles using tcsI- and its pre-expanded particles. - I have succeeded in finding a way to obtain the information, and have already made plans for Km.
Ru.

However, when polystyrene is produced by the suspension polymerization process, it is possible to obtain spherical particles using the crosslinking process, and the pre-expanded particles obtained using the RTR process are spherical. On the other hand, pre-expanded particles can be obtained using non-crosslinked anti-particles of polypropylene resin.
It is difficult to obtain a scooped spherical shape, and it is difficult to efficiently fill the container for storing the pre-foamed particles, and it is difficult to obtain a rounded, uniform shape, so there is still room for improvement. It is something that

The purpose of this project is to provide a method for producing spherical polypropylene resin particles that eliminates the drawbacks of the above-mentioned conventional technology. Result *The fat particles were dispersed in 111% using a diluted base of magnesium, a tarta bottle, and an electrolyte in a tartar bottle.*
It has been discovered that a spherical polypropylene resin can be obtained by heating to a temperature of 1lIll fat particle O melting point + 10°C or higher.

The present invention is now complete.

That is, 1 the present invention uses polypropylene resin particles, basic magnesium carbonate,
A spherical polypropylene resin resin characterized by being dispersed in a dispersion medium using 4 parts by weight or more of a dispersing agent consisting of 01 type or 2 or more types of talc and alunnicum oxide, and heated to 11 degrees above the melting point of the resin particles +10 degrees Celsius. This paper focuses on a method for producing particles.

In this li-, materials for the polypropylene system* and W* child include a, propylene monoheavy metal, ethylene-globylene-sundum copolymer 6, ethylene-propylene block copolymer, etc. Hiro can be used alone or in combination.

Ethylene-propylene random copolymer is preferred for 41. In addition, polypropylene resin particles can be made into pellets using an extruder or milled using a crusher. The weight is preferably 6 mg/piece or less, preferably 15m17 pieces or less.

A dispersant that can be used in the present invention.

Basic carbonic acid! The illumination of Gnesium, Tarta, or Aluminum oxide is a combination of two or more of them. This dispersant is used in an amount of 0.4 parts by weight or more per 100 parts by weight of the polypropylene resin particles.

If the added amount of dispersion ability is less than 0.4 parts by weight, please use Koichimoto.
It cannot be expected to make the resin particles spherical, which is the purpose of this method. Even if substances other than the above-mentioned round ones, such as basic zinc carbonate, calcium phosphate, and calcium carbonate, are used as a dispersant, no effect of spheroidization can be expected. However, these dispersants may not be added as long as they do not impede the effects of the present invention. Examples of the dispersion medium in which the resin is dispersed include one of water, ethylene glycol, dalycerin, methanol, ethanol, etc., and two or more of these. Water is preferred. The amount of dispersion medium used is usually 100 resin particles.
The amount is 100 parts by weight or more.

In this wA, it's Chihiro's melting point +
It is heated to a temperature of 10°C or higher, preferably from melting point +12°C or higher to melting point +50°C or lower. heating 11f
If the temperature is less than 11 points + 10 degrees Celsius, it is difficult to make the 11 particles spherical, and it is impossible to achieve the 6i Honnagi@0@target. After heating reaches the desired temperature, it is preferable to hold the temperature for at least 15 minutes.

In this publication, the resin particle OIk point is determined by differential scanning calorimetry (D8C). After setting the sample, heat at a moderate rate of 10°C/min in a nitrogen atmosphere.
Raise the temperature to 00℃, lower the temperature to 50℃ at a rate of 704110℃/min, and then increase the temperature again at a rate of 10℃/min. A circle with temperature as the melting point.

The spherical polypropylene resin particles obtained according to the present invention can be effectively used for producing pre-expanded particles of, for example, am resin. This pre-expanded particle manufacturing method is, for example,
*Pour K1ml of volatile blowing agent and 2 dispersion medium into the container, raise the temperature to the specified temperature while stirring, and reduce the pressure inside the container to a pressure that is greater than or equal to the vapor pressure of the volatile foaming agent and less than 1. One end of the container is released while holding the container for 41 minutes, and the resin particles and dispersion medium are simultaneously pumped out from inside the container into a lower pressure atmosphere.

The pre-expanded particles thus obtained have less variation in particle shape and less variation in the diameter of the air bubbles. When producing pre-expanded particles, usually two dispersants are used, and after obtaining the pre-expanded particles, the dispersant adhering to them is washed away, but if the resulting resin particles are used , it is necessary to wash the pre-foamed particles! There is no noise, and the number of resin particles that remain in the closed container during the production of pre-expanded particles is also significantly reduced.

A foamed shoe body can be obtained using the pre-expanded particles obtained as described above, and since the shape of the pre-expanded particles is uniform, the foaming material 111 can be efficiently filled into the foam body. Since there is little variation in the temperature, it is possible to obtain a spring-loaded body having uniform and excellent round physical properties.

Above 1111iL 9, this is the main carbonic acid, basic carbonic acid! Gnesium, Tal! , a process in which resin particles are heated to a temperature higher than the melting point of the resin base + 10°C using 0.4 parts by weight or more per 100 parts by weight of resin particles of a dispersant consisting of 1at or 2 or more types of aluminum oxide. If it is possible to obtain spherical resin particles, and if these spherical resin particles are used, for example, in the production of pre-expanded particles, it is possible to obtain pre-expanded particles with uniform shape, cell diameter, etc. The expanded body obtained using the O pre-expanded particles has advantages such as excellent physical properties.

Hereinafter, the present invention will be explained in further detail by reviewing Examples and Comparative Examples.
I will explain in 1.

Examples 1 to 9 and Comparative Examples 1 to 3 Polypropylene resin particles 1 shown in the KJII table 1 dispersant and water were added to an autoclave with stirring.

Heat to a temperature of 153-180°C and hold for 1 hour. Observe the shape of the obtained resin particles. (1) The melting point of the polypropylene resin used in these Examples and Comparative Examples is below.

Polypropylene Resin Melt A ('C) Propylene Homopolymer 16s Ethylene-Boopylene Random Copolymer 145 Ethylene-Propylene Block Copolymer 163 The results are shown in Table tal1.

Furthermore, the round spherical particles obtained in Example 3 are shown in Figure 1.

Nine particles obtained in Comparative Examples 1 and 2 are shown in Figures 112 and 31311, respectively.

Example 1O and Comparative Examples 6-7 s10 Autoclave Km 10.00j of IL resin particles obtained in Example 3 and not heated before heating.

Dichlorosifu 4p methane 20077, salt! Add 1lliII of magnesium (Example 10 was not used) and 5oooI of water, release one end of the container, and conduct a preparatory cycle while maintaining the pressure inside the container at 145°C. . The shape of the obtained pre-expanded particles was measured for variations in shape.

Measure the amount of resin particles remaining in the autoclave. The results are shown in 11128.

The obtained pre-expanded particles are filled into metal shoes for wear, heated and allowed to cool to form a cool body. Examine the power and power characteristics.9. The results are also shown for Iris 2111EK.

Pottery, the pre-expanded particles obtained in Example 10 are made into 412!
The nine pre-expanded particles obtained in Comparative Examples 6 and 7 are shown in JIS Encyclopedia and FIG. 6, respectively.

*1-Variation in bubble diameter: Good as determined as below.

There is no variation within the seeds.

Either between the particles or within the particles, there is a Bats life.〉 Both inside the rice grains and Kazuko, there are Bats insides jI x
*2 - Determine the true state of the resin shaft in the autoclave as shown in O below.

Ikubuki** child is less than 41 Iilfi 1 particle 03 regrets
.

I 3 capsules or more and less than 10 capsules Δ10 capsules or more
× Qin! -＠子廖形 0 BA 2 TSU Nakahiro, Io in the Okahata case - Pre-foaming and meeting 0 jar loft Seki □ Bacchi as below < 4
11 fixed.

Miyako - Same as above Q @〜7@agree%OΔ Same thing 5 times or less × *4-Successibility is determined as O below.

zs#/j (G) or less water vapor reaches 0 company L S Ill/j (G) or more *1m with *h
×Items that do not fuse *5 - Determine based on the Il number of the Yuran product when it is worn.

9 steel or more 0 6 or less × 4, simple IIWA J111I (according to Takaaki Hiromoto) Obtained large resin particles If, 8211 and 111311 are obtained by methods other than the present invention) A perspective view showing resin particles, jlE4I
II shows preliminary Kazuko Nagiike prepared using large resin particles obtained according to this book M-Sa, iris 5 and 6,
□□. , Eyo 4. t, □1□, 6 with the diagonal lll1ll showing the reserve prepared using.

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Procedural amendment (Maro) Showa S1 sri! 3rd Patent Office Commissioner Shima Cho Haru Judono 1, Incident Display Akebono 1f 411? IIIjl 8116m 12
, Title of the invention: Spherical Potion 1 ■ Pyrene-based resin layer/gekisou method theory 3, Relationship with the case of the person making the amendment Address of the applicant: 3-I Jusho, 3-chome, Uchinaka-cho, Chiyoda-ku, Tokyo Name (Name) II Honstyrene Paper Co., Ltd. Representative W.
* Meeting 4/Agent 〒1/1/5, Date of amendment order -1 Amendment 8, Contents of amendment Kikihakaku is attached and over-amended.

Figure 3

Claims (1)

[Claims] The polypropylene resin particles are made of polypropylene resin particles. Parts by weight: Madanesicum basic carbonate, Merck. Before aluminum oxide is used, it is dispersed in a dispersion medium using 4 parts by weight or more of a dispersant consisting of two or more types. A method for producing an OS of spherical polypropylene resin particles, in which Vt411 mold is produced by heating the above-mentioned resin at 111K above the melting point of +10°C.