Flame retardant yarn

Abstract

The flame retardant yarn of the present invention is made by blending flame retardant viscose fiber and at least one high tenacity flame retarding fiber, the at least one high tenacity flame retarding fiber is flame retardant polyester or flame retardant finishing viscose fiber, wherein the flame retardant viscose fiber is 40˜90% by weight of the flame retardant yarn. The flame retardant yarn takes advantage of the superior flame retardance of the flame retardant viscose fiber, and takes the flame retardant viscose fiber to blend with other good tenacity and spinnability fiber by adjusting amount of raw materials in reasonable balance and avoiding disadvantages of the raw materials to optimize advantages of the flame retardant viscose fiber such as flame retardancy and tenacity so as to provide the flame retardant viscose fiber with high flame retardancy, long lasting flame retardancy effect, strength and elongation performance and good abrasion resistance. Fabric made by the flame retardant yarn not only has good flame retardancy, but also has good elasticity due to high tenacity of the flame retardant yarn.

What is claimed is: 
     
         1 . A flame retardant yarn, wherein the flame retardant yarn is made by blending flame retardant viscose fiber and at least one high tenacity flame retarding fiber, the at least one high tenacity flame retarding fiber is flame retardant polyester or flame retardant finishing viscose fiber; wherein the flame retardant viscose fiber is 40˜90% by weight of the flame retardant yarn. 
     
     
         2 . The flame retardant yarn as claimed in  claim 1 , wherein the flame retardant yarn is made by blending the flame retardant viscose fiber and the flame retardant polyester, the weight percentages of the flame retardant viscose fiber and the flame retardant polyester are 65˜90% and 10˜35% respectively. 
     
     
         3 . The flame retardant yarn as claimed in  claim 1 , wherein the flame retardant yarn is made by blending the flame retardant viscose fiber, the flame retardant polyester and flame retardant finishing viscose fiber, the weight percentages of the flame retardant viscose fiber, the flame retardant polyester and flame retardant finishing viscose fiber are 40˜60%, 10˜20% and 30˜50% respectively. 
     
     
         4 . The flame retardant yarn as claimed in  claim 1 , wherein the flame retardant yarn is made by blending the flame retardant viscose fiber and flame retardant finishing viscose fiber, the weight percentages of the flame retardant viscose fiber and flame retardant finishing viscose fiber are 60˜80% and 20˜40% respectively. 
     
     
         5 . The flame retardant yarn as claimed in  claim 1 , wherein the flame retardant yarn comprises the flame retardant polyester no more than 30% by weight and having breaking strength no less than 5.1 cN/dtex. 
     
     
         6 . The flame retardant yarn as claimed in  claim 2 , wherein the flame retardant yarn comprises the flame retardant polyester no more than 30% by weight and having breaking strength no less than 5.1 cN/dtex. 
     
     
         7 . The flame retardant yarn as claimed in  claim 3 , wherein the flame retardant yarn comprises the flame retardant polyester no more than 30% by weight and having breaking strength no less than 5.1 cN/dtex. 
     
     
         8 . The flame retardant yarn as claimed in  claim 1 , wherein the flame retardant yarn comprises the flame retardant viscose fiber no less than 50% by weight and having limiting oxygen index no less than 32. 
     
     
         9 . The flame retardant yarn as claimed in  claim 2 , wherein the flame retardant yarn comprises the flame retardant viscose fiber no less than 50% by weight and having limiting oxygen index no less than 32. 
     
     
         10 . The flame retardant yarn as claimed in  claim 3 , wherein the flame retardant yarn comprises the flame retardant viscose fiber no less than 50% by weight and having limiting oxygen index no less than 32. 
     
     
         11 . The flame retardant yarn as claimed in  claim 4 , wherein the flame retardant yarn comprises the flame retardant viscose fiber no less than 50% by weight and having limiting oxygen index no less than 32. 
     
     
         12 . A method for preparing flame retardant finishing viscose fiber, wherein the method includes:
 step 1: turning viscose fibers to cellulose filaments in a manufacture of viscose fibers, making cellulose tows by entering the cellulose filaments on a spinning machine into an acid coagulation bath, and washing the cellulose tows 2˜3 times by clean water;   step 2: soaking the cellulose tows of step 1 in a solution dissolved with flame retardant by a bath ratio of 1˜2:10, and stirring every 30 minutes, wherein the flame retardant is 10˜15% by weight of the cellulose tows, the soaking temperature is 50˜60° C., the soaking time is 1˜5 hours;   step 3: taking the cellulose tows out of the solution and drying the cellulose tows at a temperature below 180° C. to obtain the flame retardant finishing viscose fibers.   
     
     
         13 . The method as claimed in  claim 12 , wherein the flame retardant is of phosphorus-nitrogen type including phosphoric acid tris(2-chloroethyl) ether, phosphoric acid tris(2,3-dichloropropyl) ether), triphosphate(2,3-dibromopropyl) ether, dimethyl methylphosphonate ether, phosphoric acid tris (ethyl butyl) ether, or combination thereof. 
     
     
         14 . A high tenacity flame retarding fabric, made by the flame retardant yarn as claimed in  claim 1 . 
     
     
         15 . The high tenacity flame retarding fabric as claimed in  claim 14 , wherein the flame retardant finishing viscose fiber is prepared by a method includes:
 step 1: turning viscose fibers to cellulose filaments in a manufacture of viscose fibers, making cellulose tows by entering the cellulose filaments on spinning machine into an acid coagulation bath, and washing the cellulose tows 2˜3 times by clean water;   step 2: soaking the cellulose tows of step 1 in a solution including a flame retardant with a bath ratio of 1˜2:10, and stirring every 30 minutes, the flame retardant is 10˜15% by weight of the cellulose tows, the soaking temperature is 50˜60° C., the soaking time is 1˜5 hours;   step 3: taking the cellulose tows out of the solution and drying the cellulose tows at a temperature below 180° C. to obtain flame retardant finishing viscose fibers.