单一的水性聚氨酯分散体存在自增稠差、固含量低、耐水性差、机械强度不如丙烯酸树脂等缺点，而且成本较高。
There exist many disadvantages of the single WPU emulsion, such as poor self-thickening, low solid content, weak water resistance, lower mechanical strength compared to acrylic resin and high cost.
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