????? ???? ????? ??????? ??, ???? ??????? ??? ???? ?????? ???? ?? ????? ???? ???? ????. ?????? ????? ????, Hpmc ? tile adhesive, ????? ????? ?? ???? ?????, ????? ??? ?????? ??? ??. ?1990 ?.? ??? ion-???? ???? ???? ???? ?? ??? ???? ??????? ???? ??? ??? Co., Ltd., ???? ???????? ????? ?? ??? ??? ????? ??? ????? ????? ???? ??????? ?? ??? ?Hpmc ??? ????? ? ??? ????? ??????????? ??? ???? ??? ?????????????? ?? ????? ?????? ????? ???? ??????? ???? ??? ???? ?????? ?????? ??? ??? ??? ?? ?? ???? ??? ???, Zhejiang Haishen New Materials Limited ??????? ????????? ??? ????? ??? ????????? ?????? ???? ????? ??????? ????? ???? ??????? ????? ???? ?????