Abstract:
The invention relates to a method for producing expandable granulates containing polylactic acid, comprising the following steps: a) melting and mixing the constituents i) between 50 and 99.9 wt. %, relative to the total weight of constituents i) to iii), of polylactic acid, ii) between 0 and 49.9 wt. %, relative to the total weight of constituents i) to iii), of at least one other polymer, iii) between 0.1 and 2 wt. %, relative to the total weight of constituents i) to iii), of a diepoxide or polyepoxide, and iv) between 0 and 10 wt. % of at least one additive, b) mixing v) between 3 and 7 wt. %, relative to the total weight of constituents i) to iv), of an organic blowing agent, into the melted polymer mass, by means of a static or dynamic mixer, at a temperature of at least 40°C, c) discharging the mixture via a nozzle plate with boreholes having a maximum on the nozzle outlet diameter of 1.5 mm, and d) granulating the melted mass containing the blowing agent directly behind the nozzle plate, under water, at a pressure of between 1 and 20 bar. The invention also relates to expandable granulates containing polylactic acid, that can be obtained according to said method, and to special expandable granulates containing polylactic acid, and between 3 and 7 wt. % of an organic blowing agent, preferably n-pentane, and especially preferably iso-pentane. The invention also relates to a preferred method for producing expandable granulates containing polylactic acid and a blowing agent, with a low bulk density.
Abstract:
A process for producing expandable pelletized material comprising polylactic acid by: a) melting and incorporating by mixing i) 50-98.9 wt.-% of polylactic acid, ii) 1-49.9 wt.-% of at least one polyester, iii) 0.1-2 wt.-% of a copolymer comprising epoxy groups and based on styrene, acrylate and/or methacrylate, and iv) 1-5 wt.-% of a nucleating agent, b) incorporating by mixing v) 1-7 wt.-% of an organic blowing agent and 0.01-5 wt-% of a co-blowing agent, into the polymer melt at >= 140°C, c) discharging through a die plate with holes
Abstract:
The invention relates to a method for producing expandable granulates containing polylactic acid, comprising the following steps: a) melting and mixing the constituents i) between 50 and 99.9 wt. %, relative to the total weight of constituents i) to iii), of polylactic acid, ii) between 0 and 49.9 wt. %, relative to the total weight of constituents i) to iii), of at least one other polymer, iii) between 0.1 and 2 wt. %, relative to the total weight of constituents i) to iii), of a diepoxide or polyepoxide, and iv) between 0 and 10 wt. % of at least one additive, b) mixing v) between 3 and 7 wt. %, relative to the total weight of constituents i) to iv), of an organic blowing agent, into the melted polymer mass, by means of a static or dynamic mixer, at a temperature of at least 40°C, c) discharging the mixture via a nozzle plate with boreholes having a maximum on the nozzle outlet diameter of 1.5 mm, and d) granulating the melted mass containing the blowing agent directly behind the nozzle plate, under water, at a pressure of between 1 and 20 bar. The invention also relates to expandable granulates containing polylactic acid, that can be obtained according to said method, and to special expandable granulates containing polylactic acid, and between 3 and 7 wt. % of an organic blowing agent, preferably n-pentane, and especially preferably iso-pentane. The invention also relates to a preferred method for producing expandable granulates containing polylactic acid and a blowing agent, with a low bulk density.
Abstract:
Método para la producción de granulados que contienen poliácido láctico que pueden expandirse, que incluye las etapas: a) fusión y mezcla de los componentes i) 50 a 98,9 % en peso, referido al peso total de los componentes i a iii, de poliácido láctico, ii) 1 a 49,9 % en peso, referido al peso total de los componentes i a iii, de por lo menos un poliéster a base de ácidos dicarboxílicos alifáticos y/o aromáticos y compuestos alifáticos que tienen dos grupos hidroxilo, iii) 0,1 a 2 % en peso, referido al peso total de los componentes i a iii, de un copolímero que tiene grupos epóxido a base de estireno, ésteres de ácido acrílico y/o ésteres de ácido metacrílico y iv) 0 a 10 % en peso, referido al peso total de los componentes i a iii, de uno o varios aditivos, b) incorporación mezclando de v) 3 a 7 % en peso, referido al peso total de los componentes i a iv, de un agente propelente orgánico en el fundido de polímero por medio de un mezclador estático o dinámico a una temperatura de por lo menos 140°C, c) descarga a través de una placa de toberas con perforaciones, cuyo diámetro a la salida de la tobera es de máximo 1,5 mm y d) producción de gránulos del fundido que tiene agente propelente directamente delante de la placa de toberas, bajo agua a una presión en el rango de 1 a 20 bar.
Abstract:
The invention relates to a method for producing expandable granulates containing polylactic acid, comprising the following steps: a) melting and mixing the constituents i) between 50 and 99.9 wt. %, relative to the total weight of constituents i) to iii), of polylactic acid, ii) between 0 and 49.9 wt. %, relative to the total weight of constituents i) to iii), of at least one other polymer, iii) between 0.1 and 2 wt. %, relative to the total weight of constituents i) to iii), of a diepoxide or polyepoxide, and iv) between 0 and 10 wt. % of at least one additive, b) mixing v) between 3 and 7 wt. %, relative to the total weight of constituents i) to iv), of an organic blowing agent, into the melted polymer mass, by means of a static or dynamic mixer, at a temperature of at least 40°C, c) discharging the mixture via a nozzle plate with boreholes having a maximum on the nozzle outlet diameter of 1.5 mm, and d) granulating the melted mass containing the blowing agent directly behind the nozzle plate, under water, at a pressure of between 1 and 20 bar. The invention also relates to expandable granulates containing polylactic acid, that can be obtained according to said method, and to special expandable granulates containing polylactic acid, and between 3 and 7 wt. % of an organic blowing agent, preferably n-pentane, and especially preferably iso-pentane. The invention also relates to a preferred method for producing expandable granulates containing polylactic acid and a blowing agent, with a low bulk density.
Abstract:
The invention relates to a method for producing expandable granulates containing polylactic acid, comprising the following steps: a) melting and mixing the constituents i) between 50 and 99.9 wt. %, relative to the total weight of constituents i) to iii), of polylactic acid, ii) between 0 and 49.9 wt. %, relative to the total weight of constituents i) to iii), of at least one other polymer, iii) between 0.1 and 2 wt. %, relative to the total weight of constituents i) to iii), of a diepoxide or polyepoxide, and iv) between 0 and 10 wt. % of at least one additive, b) mixing v) between 3 and 7 wt. %, relative to the total weight of constituents i) to iv), of an organic blowing agent, into the melted polymer mass, by means of a static or dynamic mixer, at a temperature of at least 40°C, c) discharging the mixture via a nozzle plate with boreholes having a maximum on the nozzle outlet diameter of 1.5 mm, and d) granulating the melted mass containing the blowing agent directly behind the nozzle plate, under water, at a pressure of between 1 and 20 bar. The invention also relates to expandable granulates containing polylactic acid, that can be obtained according to said method, and to special expandable granulates containing polylactic acid, and between 3 and 7 wt. % of an organic blowing agent, preferably n-pentane, and especially preferably iso-pentane. The invention also relates to a preferred method for producing expandable granulates containing polylactic acid and a blowing agent, with a low bulk density.
Abstract:
Método para producir granulados expandibles que contienen poli(ácido láctico), el cual comprende las etapas de: a) fundir e incorporar en mezcla los componentes i) 50 a 99,9 % en peso, respecto del peso total de los componentes i a iii, de poli(ácido láctico), ii) 0 a 49,9 % en peso, respecto del peso total de los componentes i a iii, de uno o de varios otros polímeros iii) 0,1 a 2 % en peso, respecto del peso total de los componentes i a iii, de un diepóxido o poliepóxido y iv) 0,1 a 5 % en peso, respecto del peso total de los componentes i y iii, de un agente de nucleación, b) incorporar en mezcla v) 1 a 7 % en peso, respecto del peso total de los componentes i a iv, de un propelente orgánico y vi) 0,01 a 5 % en peso de un co-propelentes, que se selecciona del grupo de nitrógeno, dióxido de carbono, argón, helio o mezclas de los mismos, al polímero fundido por medio de un mezclador estático o dinámico a una temperatura de al menos 140 °C, c) descargar a través de una placa de toberas con perforaciones, cuyo diámetro a la salida de la tobera es de máximo 1,5 mm, y d) granular el material fundido que contiene propelente directamente después de la placa de toberas a una presión en el intervalo de 1 a 20 bar.