TAILIEUCHUNG - Plastics Technology Handbook 2011 Part 7

Tham khảo tài liệu 'plastics technology handbook 2011 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2-112 Plastics Technology Handbook Cast Acrylic Sheeting Articles of considerable size and complexity can be fabricated from methyl methacrylate plastics by joining sections together by solvent welding. The technique described here applies to cast sheeting. With articles made from methyl methacrylate molding powders or extruded rod tubing or other shapes joining is generally not as satisfactory as with cast sheeting. With care and practice the transparency of acrylic resin can be retained in joints with the formation of a complete union of the two surfaces brought into contact. Usually one of the two surfaces to be joined is soaked in the cementing solvent until a soft swollen layer cushion has been formed upon it. This soft surface is then pressed against the surface to be attached and held in contact with it so that the excess solvent contained in the soaked area softens it also. For some purposes it may be desirable to dissolve clean savings of methyl methacrylate resin in the solvent in order to raise its viscosity so that it can be handled like glue. The most universally applicable type of solvent cement is the polymerizable type comprising a mixture of solvent and catalyzed monomer. These are mobile liquids volatile rapid in action and capable of yielding strong sound bonds. An example of these is a 40-60 mixture of methyl methacrylate monomer and methylene chloride. Before using this cement. grams of benzoyl peroxide per pint of solvent should be added. Heat treatment or annealing of joints made with solvent cements is highly desirable because it greatly increases the strength of the joint. Cellulosics The cements used with cellulosic plastics are of two types 1 solvent type consisting only of a solvent or a mixture of solvents 2 dope type consisting of a solution of the cellulosic plastic in a solvent or mixture of solvents. Acetone and mixture of acetone and methyl cellosolve are commonly used as solvent cements for cellulose .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.