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Kraft or soda black liquor adhesive and procedure for making the same

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专利汇可以提供Kraft or soda black liquor adhesive and procedure for making the same专利检索,专利查询,专利分析的服务。并且Alkaline, water soluble adhesives based on kraft or soda black liquors from the pulping industry and combined with adhesives made from phenols and formaldehyde, formalin, paraformaldehyde or other formaldehyde containing or developing substances, and intended for glueing e.g. plywood and particle board.,下面是Kraft or soda black liquor adhesive and procedure for making the same专利的具体信息内容。

1. A PROCESS FOR PREPARING AN ADHESIVE BASED ON BLACK LIQUOR FROM THE PULPING INDUSTRY HAVING A DRY MATTER CONTENT OF MORE THAN 25%, COMPRISING REACTING THE BLACK LIQUOR WITH A FORMALDEHYDE OR CRESOL TO FORM AN ADHESIVE AND COMBINING IT WITH A SEPARATELY PREPARED PHENOL-FORMALDEHYDE OR CRESOLFORMALDEHYDE ADHESIVE IN PROPORTIONS SUCH THAT THE AMOUNT OF PHENOL OR CRESOL USED IS 15-50% OF THE SUM OF THE PHENOL OR CRESOL USED AND THE ORGANIC MATTER OF THE BLACK LIQUOR.
2. A procedure according to claim 1 wherein the black liquor and additional formaldehyde or cresol are added to the phenol-formaldehyde or cresol formaldehyde adhesive and heated in the same vessel.
3. A procedure according to claim 1 wherein the value of pH is between 7 and 11, measured after dilution of 1 part by weight of adhesive with 10 parts of weight of pure water.
4. A procedure according tO claim 1 wherein an amount of formalin or paraformaldehyde of 2-15 % calculated as formaldehyde on the total organic matter of the adhesive is added after the heating of the adhesive reaction mixture.
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