Studies On Adhesive Properties Of Polymethyl Methacrylate And SY-1 Silicone Elastomer

SY-1 room temperature vulcanizing silicone elastomer (RTV'S) is a newly developed maxillofacial prosthetic elastomer. In order to improve the adhesive strength between SY-1 silicone elastomer and polymethyl methacrylate, the writer found three kinds of silicone elastomer adhesives and two kind of silicone primers. Three adhesives include: GD-414(Made by Organic Silicone Research Center in Chengdu); Adhesive-A(Made by Dow CorningCorp.) ;SDG-A(m)(Made by Organic Silicon Graduate School in shanghai). Two primers include: A-304(Made by Factor2); KH-570(Made in Tianjin).By testing the adhesive strength between SY-1 silicone elastomer and polymethyl methacrylate, the adhesive properties of three adhesives were compared; three contributing factors of the adhesive s strength between them were studied, which include: use of silicone primes swelling and grinding of polymethyl methacrylate; aging property of adhesive strength of GD-414 was tested.The results are shown below:1. When SY-1 silicone elastomer and polymethyl methacrylate were bonded by silicone adhesives with A-304, the adhesive strengths were below diminishingly: GD-414, Adhesive-A, SDG-A(m),and their strengths were stronger than the strength without adhesive agent and primer.2. When SY-1 silicone elastomer and polymethyl methacrylate were bonded by GD-414, the adhesive strengths were below diminishingly: GD-414 and A-304 onlyA-304 only GD-414.3. SY-1 silicone elastomer and polymethyl methacrylate were bonded by GD-414 with A-304 and KH-570 respectively. A-304 improved the adhesive strength; but KH-570 decreased the adhesive strength.4. When SY-1 silicone elastomer and pofymethyl methacrylate were bonded by GD-414 with A-304, the swelling of the surface of polymethyl methacrylate decreased the adhesive strength between them.5. SY-1 silicone elastomer and polymethyl methacrylate were bonded by GD-414 with A-304. Except that polymethyl methacrylate surface was polished, the adhesive strength with SY-1 silicone elastomer grows stronger with the increasing smoothness of the polymethyl methacrylate surface in the certain range.6. The adhesive strength of GD-414 did not decrease obviously with the prolong of the heating aging time.