Production method of water-absorbent resin
A manufacturing method and water-absorbing technology, applied in the field of manufacturing water-absorbing resin, can solve the problems of material elution, poor chemical resistance, etc., and achieve the effect of continuous manufacturing
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Embodiment 1
[0231] [Example 1: Immersion Test 1 of Material]
[0232] In the surface cross-linking agent used in the surface cross-linking process, the nozzle cushion whose main material is polytetrafluoroethylene (PTFE) (hollow cone nozzle K140 manufactured by IKEUCHI Co., Ltd. Parts) were impregnated at 30°C for 1 month. As the above-mentioned surface cross-linking agent, a surface cross-linking agent solution having the composition ratio of ethylene carbonate (EC):1,2-propylene glycol (PG):water (W)=0.5:0.5:3.0 was used.
[0233] The volume of the nozzle cushion before dipping in the above surface crosslinking agent is 93 [mm 3 ]. The volume of the nozzle cushion after dipping in the above surface crosslinking agent is 95 [mm 3 ]. The volume of the nozzle cushion increased by immersion in the surface cross-linking agent is 2 [mm 3 ], the volume change rate of the nozzle cushion is 2[%]. The results are shown in Table 1.
[0234] The nozzle cushion whose main material is PTFE doe...
Embodiment 2
[0235] [Example 2: Immersion test 2 of material]
[0236] In the same surface cross-linking agent as in Example 1, immerse a closer made of ceramics (hollow cone nozzle K140 manufactured by IKEUCHI Co., Ltd. - a part in the mold of micro mist generation type extremely small spray volume) at 30°C for 1 month.
[0237] The volume of the closer before being immersed in the above-mentioned surface cross-linking agent is 97 [mm 3 ]. The volume of the closer impregnated with the above-mentioned surface cross-linking agent is 99 [mm 3 ]. The volume of the closure increased by immersion in the surface cross-linking agent is 2 [mm 3 ], the volume change rate of the closer is 2[%]. The results are shown in Table 1.
[0238] The closure whose main material is ceramic does not easily change in volume even if it is immersed in the above-mentioned surface cross-linking agent, so it can be seen that it can be used for stably and continuously supplying the above-mentioned surface cross-...
Embodiment 3
[0243] [Example 3: Immersion test 3 of material]
[0244] In the surface cross-linking agent used in the surface cross-linking process, the main material of the nozzle cushion made of polytetrafluoroethylene (PTFE) (hollow cone nozzle K140 manufactured by IKEUCHI Co., Ltd. - micro mist generation type extremely small spray volume) Parts) impregnated at 30°C for 1 month. As above-mentioned surface cross-linking agent, used the surface cross-linking agent solution of following constituent ratio, namely: 1,4-butadiene (BD):1,2-propanediol (PG): water (W)=0.5:0.5: 3.0.
[0245] The volume of the nozzle cushion before being immersed in the above-mentioned surface cross-linking agent is 93 [mm 3 ]. The volume of the nozzle cushion soaked in the above surface crosslinking agent is 95 [mm 3 ]. The volume of the nozzle cushion increased by immersion in the surface cross-linking agent is 2[mm 3], the volume change rate of the nozzle cushion is 2[%]. The results are shown in Table...
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