【HVAC Version】Daily Question 20180128
Thread Content
Q&A: What precautions should be taken when carrying out on-site polyurethane foaming construction? Answer: (1) Construction should not be carried out when the temperature is below 5°C; otherwise, the temperature should be raised to 20–30℃； (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction to facilitate demolding and cleaning ； (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling.
(1) Construction should not be carried out when the temperature is below 5°C; otherwise, it should be heated to 20–30℃； (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction to facilitate demolding and cleaning ； (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling
(1) Construction should not be carried out when the temperature is below 5°C; otherwise, it should be heated to 20–30℃； (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction to facilitate demolding and cleaning ； (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling
(1) Construction should not be carried out when the temperature is below 5°C; otherwise, it should be heated to 20–30℃； ? (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； ? (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction, to facilitate demolding and cleaning ； ? (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling
(1) Construction should not be carried out when the temperature is below 5°C; otherwise, it should be heated to 20–30℃； ? (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； ? (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction, to facilitate demolding and cleaning ； ? (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling
At room temperature, the materials are stirred to facilitate mixing and reaction, after which they are poured rapidly into the space where shaping is desired. During the process, it is necessary to control the time taken for reaction and foaming, so that the mixed material remains in a liquid state as it is poured into the gaps. During the foaming process, a significant expansion force is generated, so the pouring laminate or mold must be properly reinforced.
At room temperature, the materials are stirred to facilitate mixing and reaction, after which they are poured rapidly into the space where shaping is desired. During the process, it is necessary to control the time taken for reaction and foaming, so that the mixed material remains in a liquid state as it is poured into the gaps. During the foaming process, a significant expansion force is generated; therefore, the pouring layer or mold must be properly reinforced
At room temperature, the materials are stirred to facilitate mixing and reaction, after which they are poured rapidly into the space where shaping is desired. During the process, it is necessary to control the time taken for reaction and foaming, so that the mixed material remains in a liquid state as it is poured into the gaps. During the foaming process, a significant expansion force is generated; therefore, the pouring layer or mold must be properly reinforced
At room temperature, the materials are stirred to facilitate mixing and reaction, after which they are poured rapidly into the space where shaping is desired. During the process, it is necessary to control the time taken for reaction and foaming, so that the mixed material remains in a liquid state as it is poured into the gaps. During the foaming process, a significant expansion force is generated, so the pouring laminate or mold must be properly reinforced.
(1) Construction should not be carried out when the temperature is below 5°C; otherwise, it should be heated to 20–30℃； ? (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； ? (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction, to facilitate demolding and cleaning ； ? (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling
(1) Construction should not be carried out when the temperature is below 5°C; otherwise, it should be heated to 20–30℃； ? (2) The surface of the insulator should be dry and clean; no anti-rust primer is required, and spraying can be carried out directly ； ? (3) A layer of grease can be applied to the inner surfaces of tools and molds before construction, to facilitate demolding and cleaning ； ? (4) Isocyanates and catalysts are toxic; protective measures should be taken during handling