Expanded polypropylene resin bead and process of producing same
A polypropylene resin and foamed bead technology, applied in the field of foamed polypropylene resin beads and its production process, can solve the problems of high melting point, high forming temperature and the like
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1～7 and comparative example 1～5
[0143] 100 parts of polypropylene resins selected from those listed in Table 1 and those indicated in Table 3 were blended with 0.05 parts of zinc borate powder (cell control agent), and the blend was kneaded and extruded in an extruder Shaped into wire. The wire was immediately quenched in water at 18°C. Then, the cooled wire was cut into microparticles each having a length / diameter ratio of 1.0 and an average weight of 2 mg.
[0144]In a 400-liter autoclave, add 100 parts of the above-mentioned resin particles and 220 parts of ion-exchanged water, 0.05 parts of sodium dodecylbenzenesulfonate (surfactant), 0.3 parts of kaolin powder (dispersant), selected from Table 2 Those listed in and indicated in Table 3-1 or 3-2 and the organic peroxide in the amount shown in Table 3, and the carbon dioxide (blowing agent) in the amount shown in Table 3-1 or 3-2 . The mixture in the autoclave was stirred and dispersed, heated at an average heating rate of 3°C / min to a temperature 5°C ...
Embodiment 4
[0158] Comparison of Example 4 with Comparative Example 3 shows that the apparent density of the expanded PP beads, the calorific value of the entire expanded PP beads, the apparent density of the PP molded body, and the apparent density of the cut sample of the PP molded body In terms of , they are almost the same. However, the minimum pressure required for the beads to properly melt-bond each other was higher than 0.55 MPa(G) in Comparative Example 3 and 0.38 MPa(G) in the case of Example 4, indicating that the expanded PP beads of Example 4 The minimum temperature required for melt bonding is at least 12°C lower than that of Comparative Example 3. Moreover, the mechanical strength of the PP molded body of Example 4 was comparable to that of Comparative Example 3, as expected from the similar calorific values of the high temperature peaks of the expanded PP beads of Comparative Example 3 and Example 4.
Embodiment 5
[0159] Comparison of Example 5 with Comparative Example 2 shows that the apparent density of the expanded PP beads, the calorific value of the entire expanded PP beads, the apparent density of the PP molded body, and the apparent density of the PP molded body cut sample In terms of , they are almost the same. However, the minimum pressure required for the beads to properly melt-bond each other was higher than 0.55 MPa(G) in Comparative Example 2 and 0.39 MPa(G) in the case of Example 5, indicating that the expanded PP beads of Example 5 The minimum temperature required for melt bonding is at least 11 °C lower than that of Comparative Example 2. Moreover, the mechanical strength of the PP molded body of Example 5 was comparable to that of Comparative Example 2, as expected from the similar calorific values of the high temperature peaks of the expanded PP beads of Comparative Example 2 and Example 5.
PUM
| Property | Measurement | Unit |
|---|---|---|
| melting point | aaaaa | aaaaa |
| melt flow index | aaaaa | aaaaa |
| heating value | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More