CN115819711A - Reactive extrusion 3D printing silicone rubber-polyurea material and application thereof - Google Patents

Reactive extrusion 3D printing silicone rubber-polyurea material and application thereof Download PDF

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CN115819711A
CN115819711A CN202211485564.XA CN202211485564A CN115819711A CN 115819711 A CN115819711 A CN 115819711A CN 202211485564 A CN202211485564 A CN 202211485564A CN 115819711 A CN115819711 A CN 115819711A
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printing
silicone rubber
polyurea
polyurea material
reactive extrusion
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CN115819711B (en
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王占华
夏和生
赖佳亮
何羽
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Sichuan University
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Sichuan University
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Abstract

The invention discloses a reactive extrusion 3D printing silicone rubber-polyurea material and application thereof, wherein the silicone rubber-polyurea elastomer material is prepared by the following steps: and (2) blending and extruding the amino-terminated polysiloxane, diisocyanate and a reactive catalyst for direct printing, and cooling to room temperature to obtain the product, wherein the printing temperature is 120-200 ℃, and the printing speed is controlled at 0.5-2mm/s. Wherein the molar ratio of amino groups and isocyanate groups in the amino-terminated polysiloxane to diisocyanate and in the reactivity rate modifier is 1.05 to 1.3. The silicone rubber-polyurea material printed by the method has good rebound resilience, toughness, hydrophobicity and antifouling performance, and the mechanical performance of the product is not obviously changed after the product is soaked in water for 3 days. The printed material has good performance and long service life, and the transparency of the printed product can be adjusted. Can be used in the production and application of soles, vamps, sealing materials, children toys, artware, damping products and the like.

Description

Reactive extrusion 3D printing silicone rubber-polyurea material and application thereof
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a reactive extrusion 3D printing silicone rubber-polyurea material and application thereof.
Background
The vamp or sole material prepared by the 3D printing technology has the advantages of designable structure, personal customization and the like. The materials for preparing the shoe upper or the shoe sole by adopting the 3D printing technology are polyurethane elastomers or light-cured resin materials. Polyureas and polyurethanes have similar molecular structures, except that polyurethanes are prepared by reacting hydroxyl groups with isocyanates and polyureas are prepared by reacting amino groups with isocyanates. The polyurea material has excellent elasticity and can be used as a material for shoes. The disadvantages are 1) the reaction rate of amino and isocyanate is extremely fast, difficult to control, difficult to process and difficult to prepare products with specific structures; 2) The urea bond in polyurea can make the material absorb water, and is usually solved by introducing aromatic rigid group and increasing the crosslinking degree, but the elasticity and toughness of the material are lost.
The most common processing method for polyureas is spray coating, which is suitable for producing protective coatings on a variety of substrates. In addition, the reaction extrusion molding method can also be used for spraying construction of polyurea. Spray coating and conventional reactive extrusion processes do not produce articles having specific structures and functions. The polyurea material with a special structure is constructed by using a 3D printing technology, so that the performances of vibration reduction, resilience and the like of the polyurea material can be improved, and the polyurea material has important application in the field of shoe materials. There are few reports on the polyurea 3D printing technology, and the technology is generally a photocuring 3D technology.
Application No.: 2019107906039 provides a photosensitive resin comprising an acrylate oligomer containing a urea bond and having a functionality of 2 or more, and a method of 3D printing polyurea; the acrylate oligomer containing urea bonds and having double bond functionality of more than or equal to 2 is obtained by reacting an isocyanate group-terminated compound having functionality of more than or equal to 2 with an amino-containing acrylate or methacrylate compound. The invention also provides a 3D polyurea printing method. After the photosensitive resin provided by the invention is photocured or 3D printed to form a polymer, the molecular structure, crosslinking density and other network structure characteristics of the polymer can be changed through specific post-treatment, so that the thermal and mechanical properties of the polymer can be adjusted through the post-treatment. This patent adopts photocuring technique to carry out 3D and prints, and it is difficult to print the surperficial monomer of goods and clear away, and environmental pollution is serious, and printable monomer kind is limited, is not suitable for reaction to extrude 3D and prints silicon rubber-polyurea material.
Application No.: 2018800638856 discloses a method of additive layer manufacturing using co-reactive components. Thermosetting compositions for use in additive manufacturing are also disclosed. The invention provides a reactive lamination manufacturing method, which comprises the following steps: providing a first component comprising a first compound to a first pump; providing a second component comprising a second compound into a second pump, wherein the first compound is reactive with the second compound. Amino compounds and isocyanate compounds are suitable for this method, but this invention does not mention how to control the reaction rate of the amino compound and the isocyanate compound to ensure high-precision printing, mechanical properties, antifouling properties, and hydrophobic properties of printed products, and specific printing parameters such as printing speed, printing temperature, and the like. In addition, the technology needs mold support, and the preparation of a complex structure is difficult. Although the above-mentioned problem of determining the reaction rate and optimum temperature can be solved by a limited number of experiments, the effect is limited.
Based on this, the speed regulator is specially added to solve the technical problems, but part of the system may have too high viscosity, so that a printing sample cannot be obtained, and layer-by-layer obstacles including selection of raw materials, determination of reaction temperature, determination of monomer proportion, selection of molecular weight and catalyst type and the like are overcome, so that the direct-writing 3D printing of the silicone rubber-polyurea product with a special complex structure is finally realized.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a reactive extrusion 3D printing silicone rubber-polyurea material and applications thereof, and the technical solution is realized by the following method:
a method of reactive extrusion 3D printing a silicone rubber-polyurea material, comprising:
and (3) blending the monomer A, the monomer B and the reactive catalyst, extruding, directly printing, and cooling to room temperature to obtain the ink.
Further, the monomer A is primary amine terminated polysiloxane or secondary amine terminated polysiloxane or a mixture of the two;
the molecular weight of the primary amine terminated polysiloxane is 600-5000g/mol;
the molecular weight of the secondary amine terminated polysiloxane is 600-5000g/mol.
Further, the monomer B is one or a mixture of toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate and dicyclohexylmethane diisocyanate.
Further, the reactive catalyst is one or a mixture of several of N-methyl-2,2 ' -diaminodiethylamine, aminoethylpiperazine, N ' -trimethyldiethylenetriamine and N, N ' -trimethylbis (hexamethylene) triamine.
Further, the printing temperature is 120-200 ℃
Further, the molar ratio of the amino group to the isocyanate in the monomer A and the monomer B and the reactivity rate regulator is 1.05 to 1.3.
Further, the printing speed is 0.5-2mm/s.
The invention also discloses a silicone rubber-polyurea material prepared by any one of the reactive extrusion 3D printing methods.
The invention also discloses an application of the silicone rubber-polyurea material in the production and preparation of shoe products, sealing materials, toys for children, artware and damping materials.
Further, the production of the footwear comprises the production of an upper material and the production of a midsole material.
The technical scheme of the invention has the following beneficial effects:
1) The monomer A, the monomer B and the reactivity rate regulator are mixed by a printer and extruded in the reaction process, so that direct-writing 3D printing is realized, and a silicone rubber-polyurea product with a special complex structure can be printed. During mixing, the amino compound reacts with the isocyanate compound to effect curing, ensuring that the printed article retains its shape on the substrate. The reactive catalyst is a triamine compound, one amino group is tertiary amine and plays a role in catalysis, the other two amino groups are primary amine or secondary amine and can react on the main chain of the silicone rubber-polyurea elastomer material, and different from the traditional catalyst, the catalyst can react on the main chain of a polymer, so that the phenomenon that the overflow of the catalyst is generated to influence the performance and the service life of the material is avoided. The tertiary amine group in the reactive catalyst can catalyze the urea bond to be dissociated at high temperature, so that amino and isocyanate are regenerated, the viscosity of the system is reduced, and smooth printing is ensured. The tertiary amine group in the reactive catalyst can promote the generated amino group generated by dissociation and isocyanate to form a urea bond again at low temperature, so that the material printed on the substrate is quickly cured, and the printing precision is ensured. By changing the monomer ratio, molecular weight and catalyst type, products with different mechanical properties can be obtained, and the transparency of the printed product can be adjusted.
2) The product printed by the invention has an antifouling function, and when the surface is polluted, pollutants are easy to remove. Meanwhile, the printed product has better hydrophobic property, and the mechanical property of the product is not obviously changed after the printed product is soaked in water for 3 days. The printed article may be used to make shoe uppers, shoe soles, children's toys, artwork, and the like.
Drawings
FIG. 1 is a stress-strain curve of a printed article of example 1;
FIG. 2 is an optical photograph of a printed article of example 2;
FIG. 3 is a static contact angle photomicrograph of a printed article of example 3;
FIG. 4 is an infrared spectrum of a printed article of example 4;
FIG. 5 is a stress-strain curve of the original printed article of example 5 and after 72 hours of immersion in water;
FIG. 6 is an optical photograph of example 5 at the needle during printing extrusion;
FIG. 7 is an optical photograph of example 6 printed at the needle during extrusion.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
Example 1
15g of a primary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 5g of a secondary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 4.5g of isophorone diisocyanate and 0.2g of N-methyl-2,2' -diaminodiethylamine were mixed, subjected to reaction extrusion 3D printing at 140 ℃ at a speed of 1mm/s, and cooled to room temperature to obtain a printed article.
As shown in FIG. 1, the elongation at break of the silicone rubber-polyurea prepared by the 3D printing method can reach 520%, and the silicone rubber-polyurea has good flexibility.
Example 2
20g of a primary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 5.2g of dicyclohexylmethane diisocyanate and 0.3g of aminoethylpiperazine were subjected to reaction extrusion 3D printing at 160 ℃ at a speed of 1mm/s and cooled to room temperature to give a printed article.
As shown in FIG. 2, the 3D printing method can be used for preparing the silicone rubber-polyurea product with a special complex structure and higher printing precision.
Example 3
13g of a primary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 7g of a secondary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 3.5g of toluene diisocyanate and 0.3g of N-methyl-2,2' -diaminodiethylamine were mixed, subjected to reaction extrusion 3D printing at 120 ℃ at a speed of 1.5mm/s, and cooled to room temperature to obtain a printed article.
As shown in fig. 3, the contact angle of the printed article obtained in example 3 is 111 °, which illustrates that the article with hydrophobic and anti-fouling surface can be obtained by the 3D printing technology.
Example 4
6g of a primary amine-terminated polysiloxane having a molecular weight of 600g/mol, 14g of a secondary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 6g of diphenylmethane diisocyanate and 0.5g of N, N' -trimethyldiethylenetriamine were subjected to reaction extrusion 3D printing at a speed of 1mm/s at 160 ℃ and cooled to room temperature to obtain a printed article.
FIG. 4 is an infrared spectrum of example 4 from which 2250cm-1 shows no significant absorption peak, demonstrating complete reaction of the amino group and isocyanate.
Example 5
10g of primary amine terminated polysiloxane with the molecular weight of 1000g/mol, 10g of secondary amine terminated polysiloxane with the molecular weight of 1000g/mol, 5g of diphenylmethane diisocyanate and 0.5g of N, N' -trimethyldiethylenetriamine are subjected to reaction extrusion 3D printing at the speed of 1.5mm/s at 160 ℃, cooled to room temperature to obtain a printed product, and the printed product is placed in deionized water to be soaked for 3 days to test the mechanical property of the printed product.
Fig. 5 is a tensile curve of example 5, from which it can be derived that the mechanical properties of the printed article do not change significantly after being soaked in deionized water for 7 days, demonstrating that the printed article has excellent water resistance.
FIG. 6 is an optical photograph of the printer tip during the printing process of example 5, from which it can be seen that the sample containing the reactive catalyst N, N' -trimethyldiethylenetriamine can be printed smoothly.
Example 6
10g of a primary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 10g of a secondary amine-terminated polysiloxane having a molecular weight of 1000g/mol, 5g of diphenylmethane diisocyanate were subjected to reaction extrusion 3D printing at a speed of 1.5mm/s at 160-200 ℃.
Fig. 7 is an optical photograph of the printer needle in the printing process of example 6, from which it can be seen that the sample without the reactive catalyst N, N', N ″ -trimethyldiethylenetriamine is difficult to print, and the temperature is raised to 200 ℃ in time, so that the sample is still difficult to print smoothly, and aggregation occurs at the nozzle.
In conclusion, the silicone rubber-polyurea material printed by the method has good rebound resilience, toughness, hydrophobicity and antifouling performance, and the mechanical properties of the product are not obviously changed after the product is soaked in water for 3 days. The printed material has good performance and long service life, and the transparency of the printed product can be adjusted. Can be used for the production and application of soles, vamps, sealing materials, children toys, artware, shock absorption products and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method of reactive extrusion 3D printing of a silicone rubber-polyurea material comprising:
and (3) blending and extruding the monomer A, the monomer B and the reactive catalyst, directly printing, and cooling to room temperature to obtain the ink.
2. The method of reactive extrusion 3D printing of silicone rubber-polyurea material according to claim 1, wherein:
the monomer A is primary amine terminated polysiloxane or secondary amine terminated polysiloxane or a mixture of the two;
the molecular weight of the primary amine terminated polysiloxane is 600-5000g/mol;
the molecular weight of the secondary amine terminated polysiloxane is 600-5000g/mol.
3. The method of reactive extrusion 3D printing of silicone rubber-polyurea material according to claim 1, wherein:
the monomer B is one or a mixture of more of toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate and dicyclohexylmethane diisocyanate.
4. The method of reactive extrusion 3D printing of silicone rubber-polyurea material according to claim 1, wherein:
the reactive catalyst is one or a mixture of more of N-methyl-2,2 ' -diaminodiethylamine, aminoethylpiperazine, N ' -trimethyldiethylenetriamine and N, N ' -trimethylbis (hexamethylene) triamine.
5. The method of reactive extrusion 3D printing of silicone rubber-polyurea material according to claim 1, wherein:
the printing temperature is 120-200 ℃.
6. The method of reactive extrusion 3D printing of silicone rubber-polyurea material according to claim 1, wherein:
the molar ratio of amino and isocyanate in the monomer A to the monomer B and in the reactivity rate regulator is 1.05-1.3.
7. The method of reactive extrusion 3D printing of silicone rubber-polyurea material according to claim 1, wherein:
the printing speed is 0.5-2mm/s.
8. A silicone rubber-polyurea material made according to any one of the reactive extrusion 3D printing methods of claims 1-7.
9. Use of the silicone rubber-polyurea material according to claim 8 for the production of footwear, sealing materials, toys for children, crafts, shock absorbers.
10. The use according to claim 9, wherein:
the production of the footwear comprises the production of an upper material and the production of a midsole material.
CN202211485564.XA 2022-11-24 2022-11-24 Reactive extrusion 3D printing silicone rubber-polyurea material and application thereof Active CN115819711B (en)

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