Flame-retardant natural rubber waterstop and preparation method thereof

The invention relates to the technical field of rubber waterstops, and provides a flame-retardant natural rubber waterstop and a preparation method thereof, the flame-retardant natural rubber waterstop comprises the following components by weight: 80-90 parts of natural rubber, 10-20 parts of a composite flame retardant, 5-10 parts of a filler, 1-2 parts of an anti-aging agent, 3-4 parts of a vulcanizing agent, 1-2 parts of an accelerator, and 0.5-1 part of an active agent; the composite flame retardant is prepared from ammonium polyphosphate, melamine borate and zinc borate. By means of the technical scheme, the problem that in the prior art, a natural rubber water stop belt is poor in flame retardance is solved. 本发明涉及橡胶止水带技术领域，提出了一种阻燃型天然橡胶止水带及其制备方法，包括以下重量份的组分：天然橡胶80~90份、复合阻燃剂10~20份、填料5~10份、防老剂1~2份、硫化剂3~4份、促进剂1~2份、活性剂0.5~1份；复合阻燃剂由聚磷酸铵、三聚氰胺硼酸盐和硼酸锌组成。通过上述技术方案，解决了现有技术中的天然橡胶止水带阻燃性差的问题。