With the increase of PAPI dosage, the crosslinking degree of foam increases, and the strength and stiffness increase. However, if PAPI is used too much, the foam will become brittle and the core material will crack easily.

　　，聚醚多元醇的选择是重要的。聚醚多元醇是聚氨酯硬泡的基本原料之一，它影响着泡沫芯材的物理力学性能、尺寸稳定性和发泡工艺性能。根据起始剂、羟值和粘度确定聚醚模型。

　　First of all, the selection of polyether polyols is the most important. Polyether polyol is one of the basic raw materials for rigid polyurethane foam. It affects the physical and mechanical properties, dimensional stability and foaming process properties of foam core. The polyether model was determined according to initiator, hydroxyl value and viscosity.

　　应选用乳化能力强的泡沫稳定剂。主要控制气泡孔的大小，保持气泡孔的稳定，防止气泡孔的坍塌。硅酮泡沫稳定剂在这方面效果较好，其用量可在1.5 ~ 2.5(质量分数)范围内调节发泡剂的种类和用量，直接影响聚氨酯硬泡的密度、强度等物理性能。

　　Foam stabilizer with strong emulsifying capacity should be selected. It mainly controls the size of the bubble hole, maintains the stability of the bubble hole, and prevents the collapse of the bubble hole. Silicone foam stabilizer has better effect in this respect, and its dosage can regulate the type and dosage of foaming agent in the range of 1.5 ~ 2.5 (mass fraction), which directly affects the physical properties of polyurethane rigid foam, such as density and strength.

　　发泡剂不仅可以调节和控制发泡产品的密度和性能，还可以降低聚醚的组合粘度，改善其发泡工艺，提高泡沫的流动性，有利于泡沫的成型。鉴于可持续发展战略的需要，对生态环境危害严重的氟碳化合物的使用受到了限制，替代发泡剂的使用也受到了限制。

　　Foaming agent can not only regulate and control the density and performance of foaming products, but also reduce the combined viscosity of polyether, improve the foaming process, improve the fluidity of foam, and facilitate the formation of foam. In view of the need of sustainable development strategy, the use of fluorocarbons which are harmful to the ecological environment is limited, and the use of alternative foaming agents is also limited.

　　选择催化剂可以选择延迟催化体系，使乳白时间与凝胶时间间隔更长，有效提高发泡体系的流动性，提高泡沫性能，从而适合生产工艺操作。腔泡沫是否均匀,细度的泡沫,泡沫的关闭率和其他因素对整体绝缘性能有很大的影响的,这些因素与泡沫之间的粘连程度和空心墙,泡沫的稳定性大小。

　　Choosing catalyst can choose delayed catalytic system, make the interval between milky white time and gel time longer, effectively improve the fluidity of foaming system and improve the performance of foam, so that it is suitable for production process operation. The uniformity of cavity foam, the fineness of the foam, the closing rate of foam and other factors have great influence on the overall insulation performance. These factors are related to the degree of adhesion between the foam and the hollow wall, and the stability of the foam.

　　阻燃剂可以提高泡沫塑料的阻燃性，但在发泡过程中阻燃剂对泡沫的破坏作用较大。在提高阻燃效果的前提下，可以保证泡沫塑料的使用性能和尺寸稳定性。

　　Flame retardants can improve the flame retardancy of foam plastics, but the effect of flame retardants on foaming is greater during foaming process. The performance and dimensional stability of foamed plastics can be guaranteed on the premise of improving the flame retardant effect.

　　聚氨酯复合板具有更好的耐磨性和耐腐蚀性，可以在建筑保温、隔热、吸声降噪等性能上非常突出，所以如何选择更好是非常重要的。当然，有必要多了解一下聚氨酯复合板的报价。

　　Polyurethane composite board has better wear resistance and corrosion resistance, which can be very prominent in building insulation, heat insulation, sound absorption and noise reduction, so how to choose better is very important. Of course, it is necessary to know more about the quotation of polyurethane composite board.