PF resin is modified by use of urea and resorcin to prepare a kind of mid-temperature water-soluble resin, which is suitable for "hot-hot process" in bamboo plywood production.
研制了一种适合“热进-热出”工艺的中温固化水溶性酚醛树脂，该酚醛树脂是在传统的水溶性酚醛树脂合成工艺的基础上，加入一定量的间苯二酚和尿素制成。
Hot-process phosphoric acid contains a little impurities which are mainly Pb and very little Zn, Cu, Ni, Mn, Cr and Cd.
热法磷酸中含有少量重金属杂质，主要是铅以及微量的锌、铜、镍、锰、铬和镉等。
Shangsuan phosphate rock of Yunnan province was acidulated by the phosphoric acid about 20% P2O5 produced by hot-process.
采用热法磷酸制成含20% P 2o5左右的磷酸，用以与云南上蒜磷矿进行分解反应。
Shangsuan phosphate rock of Yunnan province was acidulated by the phosphoric acid about 20% P2O5 produced by hot-process.
采用热法磷酸制成含20% P 2o5左右的磷酸，用以与云南上蒜磷矿进行分解反应。
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