阅读说明：本技术 一种阻燃超高强聚乙烯的生产方法 (Production method of flame-retardant ultrahigh-strength polyethylene ) 是由 陈林 金效东 张亮 王亚军 于 2021-05-14 设计创作，主要内容包括：本发明公开了一种阻燃超高强聚乙烯的生产方法,应用在纤维制造的领域中,解决了现有超高强聚乙烯阻燃性能不佳的技术问题,其技术方案要点是包括以下步骤：S1、原料制备；S2、螺杆挤出；S3、纺丝加工；S4、水冷萃取；S5、在S4中干燥后的纤维表面进行粘附液喷淋覆膜,快速穿过阻燃颗粒料桶,阻燃颗粒料桶内装有大量聚碳酸酯粉粒,在阻燃颗粒料桶内部还设有超声波发生器；S6、加热牵伸；S7、热风吹整；S8、包装,具有能够提高加工后超高强聚乙烯纤维的阻燃耐火性能的技术效果。(The invention discloses a method for producing flame-retardant ultra-high-strength polyethylene, which is applied to the field of fiber manufacturing and solves the technical problem that the existing ultra-high-strength polyethylene has poor flame-retardant performance, and the technical scheme is characterized by comprising the following steps: s1, preparing raw materials; s2, screw extrusion; s3, spinning; s4, water-cooling extraction; s5, spraying an adhesive liquid on the surface of the fiber dried in the step S4 to form a film, rapidly penetrating through a flame-retardant particle charging barrel, filling a large amount of polycarbonate powder into the flame-retardant particle charging barrel, and arranging an ultrasonic generator inside the flame-retardant particle charging barrel; s6, heating and drafting; s7, blowing with hot air; s8, packaging, and the technical effect of improving the flame retardant and fire resistant performance of the processed ultra-high strength polyethylene fiber is achieved.)

1. A production method of flame-retardant ultra-high-strength polyethylene is characterized by comprising the following steps: the method comprises the following steps:

s1, preparation of raw materials: adding solvent oil, an antioxidant and a modifier into the ultra-high molecular weight polyethylene powder, stirring to fully mix all ingredients, and synchronously mixing a composite flame retardant additive, wherein the flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide;

s2, screw extrusion: adding the mixed raw materials prepared in the step S1 into a double-screw extruder, and heating, swelling and dissolving to prepare a spinning solution;

s3, spinning: adding an organic phosphorus halogen-free flame retardant into the spinning solution prepared in the step S2, spinning through spinning equipment, and blending with flame-retardant yarns in the spinning process to prepare spun fibers;

s4, water-cooling extraction: extracting the spun fiber prepared in the step S3 through an extractor, and drying the fiber after extraction to prepare extracted fiber;

s5, spraying an adhesive liquid on the surface of the fiber dried in the step S4 to form a film, rapidly penetrating through a flame-retardant particle charging barrel, filling a large amount of polycarbonate powder into the flame-retardant particle charging barrel, and arranging an ultrasonic generator inside the flame-retardant particle charging barrel;

s6, heating and drafting: heating and stretching the fiber in the step S5, wherein stretching is carried out repeatedly, and the stretching temperature of the fiber is 100-150 ℃;

s7, hot air blowing: performing high-temperature air supply shaping on the drawn fiber prepared in the step S6, controlling the temperature of an air body at 50-60 ℃ and keeping the duration for 1-2 min;

s8, packaging: and (5) filling the finished product prepared by the S7 into a closed packaging bag.

2. The method of claim 1, wherein the method comprises the steps of: the ratio of the polyethylene powder to the composite flame retardant additive is controlled to be 3:1-5: 1.

3. The method of claim 1, wherein the method comprises the steps of: the blending ratio of the fiber yarns and the flame-retardant yarns in the S3 is 6: 1.

4. The method of claim 1, wherein the method comprises the steps of: and in the step S5, the spraying time is controlled to be between 1.5S and 2S, and the inlet end of the flame-retardant particle barrel is provided with a glue scraping groove.

5. The method of claim 1, wherein the method comprises the steps of: and in the step S6, the cycle of one reciprocating telescopic action is 3S-5S.

6. The method of claim 1, wherein the method comprises the steps of: and inert protective gas is filled in the packaging bag in the S8.

Technical Field

The invention relates to the field of fiber materials, in particular to a production method of flame-retardant ultrahigh-strength polyethylene.

Background

The ultra-high molecular weight polyethylene fiber is a third generation special fiber with high strength, high modulus and high technology after carbon fiber and aramid fiber. The fiber has extremely high molecular weight, good combination of molecular main chains, very high crystallinity and orientation degree of the fiber, and particularly excellent tensile property, and the tensile strength of the fiber is the highest of the high-performance fibers produced in the prior industrialization, and the specific strength of the fiber is 15 times that of high-quality steel wires, 2.6 times that of carbon fibers and 1.7 times that of aramid fibers.

Although ultra-high molecular weight polyethylene fiber has such excellent properties, it is easily combustible and has a limiting oxygen index (LOI value) of only 17.5, which limits its application and development in many respects. The ultra-high molecular weight polyethylene fiber in the prior art still cannot overcome the defect of flammability of polyethylene, and has larger heat productivity and smoke generation amount in the combustion process.

Disclosure of Invention

The invention aims to provide a production method of flame-retardant ultrahigh-strength polyethylene, which has the advantage of high flame-retardant ultrahigh-strength polyethylene.

The technical purpose of the invention is realized by the following technical scheme: a production method of flame-retardant ultra-high-strength polyethylene is characterized by comprising the following steps: the method comprises the following steps:

s1, preparation of raw materials: adding solvent oil, an antioxidant and a modifier into the ultra-high molecular weight polyethylene powder, stirring to fully mix all ingredients, and synchronously mixing a composite flame retardant additive, wherein the flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide;

s2, screw extrusion: adding the mixed raw materials prepared in the step S1 into a double-screw extruder, and heating, swelling and dissolving to prepare a spinning solution;

s3, spinning: adding an organic phosphorus halogen-free flame retardant into the spinning solution prepared in the step S2, spinning through spinning equipment, and blending with flame-retardant yarns in the spinning process to prepare spun fibers;

s4, water-cooling extraction: extracting the spun fiber prepared in the step S3 through an extractor, and drying the fiber after extraction to prepare extracted fiber;

s5, spraying an adhesive liquid on the surface of the fiber dried in the step S4 to form a film, rapidly penetrating through a flame-retardant particle charging barrel, filling a large amount of polycarbonate powder into the flame-retardant particle charging barrel, and arranging an ultrasonic generator inside the flame-retardant particle charging barrel;

s6, heating and drafting: heating and stretching the fiber in the step S5, wherein stretching is carried out repeatedly, and the stretching temperature of the fiber is 100-150 ℃;

s7, hot air blowing: performing high-temperature air supply shaping on the drawn fiber prepared in the step S6, controlling the temperature of an air body at 50-60 ℃ and keeping the duration for 1-2 min;

s8, packaging: and (5) filling the finished product prepared by the S7 into a closed packaging bag.

Preferably: the ratio of the polyethylene powder to the composite flame retardant additive is controlled to be 3:1-5: 1.

Preferably: the blending ratio of the fiber yarns and the flame-retardant yarns in the S3 is 6: 1.

Preferably: and in the step S5, the spraying time is controlled to be between 1.5S and 2S, and the inlet end of the flame-retardant particle barrel is provided with a glue scraping groove.

Preferably: and in the step S6, the cycle of one reciprocating telescopic action is 3S-5S.

Preferably: and inert protective gas is filled in the packaging bag in the S8.

In conclusion, the invention has the following beneficial effects:

1. the flame retardant is mixed into the flame-retardant ultrahigh-strength polyethylene raw material, so that the overall flame retardant performance of the product is remarkably improved, meanwhile, the flame-retardant yarns are mixed in the process of blending the polyethylene fibers, the flame-retardant property of the polyethylene fibers after spinning is further improved, the flame-retardant particles are adhered and infiltrated on the outer surface, a stable flame-retardant layer is formed on the surface of the polyethylene product, the stable flame-retardant material fluid is formed on the surface of the product, and the comprehensive flame-retardant performance of the product is finally realized.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

s1, preparation of raw materials: adding solvent oil, an antioxidant and a modifier into the ultra-high molecular weight polyethylene powder, stirring to fully mix all ingredients, synchronously mixing the compound flame retardant additive, wherein the ratio of the polyethylene powder to the compound flame retardant additive is 3:1, and the flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide;

s2, screw extrusion: adding the mixed raw materials prepared in the step S1 into a double-screw extruder, and heating, swelling and dissolving to prepare a spinning solution;

s3, spinning: adding an organic phosphorus halogen-free flame retardant into the spinning solution prepared in the step S2, spinning through spinning equipment, mixing flame-retardant yarns in the spinning process for blending, wherein the blending ratio of the fiber yarns to the flame-retardant yarns is 6:1, and preparing the spun fiber;

s4, water-cooling extraction: extracting the spun fiber prepared in the step S3 through an extractor, and drying the fiber after extraction to prepare extracted fiber;

s5, spraying adhesive liquid on the surface of the fiber dried in the S4 for laminating, wherein the spraying time is 1.5S, the fiber rapidly penetrates through a flame-retardant particle charging basket, a glue scraping groove is arranged at the inlet end of the flame-retardant particle charging basket, the uniformity of the surface of a sprayed colloid can be guaranteed, a large amount of polycarbonate powder particles are filled in the flame-retardant particle charging basket, and an ultrasonic generator is also arranged in the flame-retardant particle charging basket;

s6, heating and drafting: heating and stretching the fiber in the step S5, wherein stretching is carried out repeatedly, the cycle of one-time reciprocating stretching is 3S, and the fiber stretching temperature is 100 ℃;

s7, hot air blowing: performing high-temperature air supply shaping on the drawn fiber prepared in the step S6, controlling the temperature of an air body at 50 ℃ and keeping the duration for 1 min;

s8, packaging: and (5) filling the finished product prepared by the step (S7) into a closed packaging bag, and filling inert protective gas into the packaging bag.

Example two:

s1, preparation of raw materials: adding solvent oil, an antioxidant and a modifier into the ultra-high molecular weight polyethylene powder, stirring to fully mix all ingredients, synchronously mixing the compound flame retardant additive, wherein the ratio of the polyethylene powder to the compound flame retardant additive is 4:1, and the flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide;

s2, screw extrusion: adding the mixed raw materials prepared in the step S1 into a double-screw extruder, and heating, swelling and dissolving to prepare a spinning solution;

s3, spinning: adding an organic phosphorus halogen-free flame retardant into the spinning solution prepared in the step S2, spinning through spinning equipment, mixing flame-retardant yarns in the spinning process for blending, wherein the blending ratio of the fiber yarns to the flame-retardant yarns is 6:1, and preparing the spun fiber;

s4, water-cooling extraction: extracting the spun fiber prepared in the step S3 through an extractor, and drying the fiber after extraction to prepare extracted fiber;

s5, spraying adhesive liquid on the surface of the fiber dried in the S4 for laminating, wherein the spraying time is 1.8S, the fiber rapidly penetrates through a flame-retardant particle charging basket, a glue scraping groove is arranged at the inlet end of the flame-retardant particle charging basket, the uniformity of the surface of a sprayed colloid can be guaranteed, a large amount of polycarbonate powder particles are filled in the flame-retardant particle charging basket, and an ultrasonic generator is also arranged in the flame-retardant particle charging basket;

s6, heating and drafting: heating and stretching the fiber obtained in the step S5, wherein stretching is carried out repeatedly, the cycle of one-time reciprocating stretching is 4S, and the fiber stretching temperature is 130 ℃;

s7, hot air blowing: performing high-temperature air supply shaping on the drawn fiber prepared in the step S6, controlling the temperature of an air body to be 55 ℃ and keeping the duration for 1.5 min;

s8, packaging: and (5) filling the finished product prepared by the step (S7) into a closed packaging bag, and filling inert protective gas into the packaging bag.

Example three:

s1, preparation of raw materials: adding solvent oil, an antioxidant and a modifier into the ultra-high molecular weight polyethylene powder, stirring to fully mix all ingredients, synchronously mixing the compound flame retardant additive, wherein the ratio of the polyethylene powder to the compound flame retardant additive is 5:1, and the flame retardant is a mixture of aluminum hydroxide and magnesium hydroxide;

s2, screw extrusion: adding the mixed raw materials prepared in the step S1 into a double-screw extruder, and heating, swelling and dissolving to prepare a spinning solution;

s3, spinning: adding an organic phosphorus halogen-free flame retardant into the spinning solution prepared in the step S2, spinning through spinning equipment, mixing flame-retardant yarns in the spinning process for blending, wherein the blending ratio of the fiber yarns to the flame-retardant yarns is 6:1, and preparing the spun fiber;

s4, water-cooling extraction: extracting the spun fiber prepared in the step S3 through an extractor, and drying the fiber after extraction to prepare extracted fiber;

s5, spraying adhesive liquid on the surface of the fiber dried in the step S4 for 2S to form a film, rapidly penetrating through a flame-retardant particle charging barrel, wherein a glue scraping groove is formed in the inlet end of the flame-retardant particle charging barrel to ensure the uniformity of the surface of the sprayed colloid;

s6, heating and drafting: heating and stretching the fiber obtained in the step S5, wherein stretching is carried out repeatedly, the cycle of one-time reciprocating stretching is 5S, and the fiber stretching temperature is 150 ℃;

s7, hot air blowing: performing high-temperature air supply shaping on the drawn fiber prepared in the step S6, controlling the temperature of an air body at 60 ℃ and keeping the duration for 2 min;

s8, packaging: and (5) filling the finished product prepared by the step (S7) into a closed packaging bag, and filling inert protective gas into the packaging bag.

Through comparison of the final products of the first, second and third embodiments, the flame retardant property of the fiber is obviously improved compared with that of the same type of products on the market while the high-strength polyethylene fiber is satisfied, wherein the flame retardant property of the product of the second embodiment reaches 10min through actual tests, namely the flame retardant state of the product can be kept for 10min, and the working stability of the product under high-temperature fire conditions is effectively prolonged, so that the method is an optimal scheme; the flame retardant performance of the first product and the third product can reach more than 5min, and the flame retardant performance of the first product and the third product is obviously improved compared with the characteristic that the existing products are not flame retardant.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.