High-density high-elasticity easily-compressible folding mold cup and preparation method thereof
Patent Information
- Application Number
- CN202611206481.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-10
- Publication Date
- 2026-10-13
AI Technical Summary
[0005]为了解决现有的模杯不能较好地兼具高密度和高弹性，不能较好地实现模杯在真空负压下的高效压缩与折叠，并兼顾良好的恢复性能与穿戴舒适度的问题，本申请提供一种高密度高弹性易压缩折叠的模杯及其制备方法
1.本申请的高密度高弹性易压缩折叠的模杯，使用由二异氰酸酯、硅烷改性异氰酸酯、聚醚多元醇、交联助剂、发泡剂、催化剂和抗氧剂制得的发泡胶料经模压发泡制得模杯，其中硅烷改性异氰酸酯由聚醚多元醇、3-异氰酸酯基丙基三乙氧基硅烷、三(2-羟乙基)异氰尿酸酯和催化剂制得，制得的模杯能够较好地兼具高密度和高弹性，在真空负压下能实现高效压缩与折叠，压缩后可保持较小体积，解除压缩后能快速恢复原有形态，且不影响使用性能，同时还具备良好的支撑性和穿戴舒适度。
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Abstract
Description
Technical Field
[0001] This application relates to the field of molded cups, and in particular to a high-density, high-elasticity, easily compressible and foldable molded cup and its preparation method. Background Technology
[0002] Molded cups are widely used in bras, sports bras, swimwear, and other apparel, serving to provide support, shape, and enhance wearing comfort. During the production, storage, and transportation of molded cups, vacuum compression packaging is typically used to reduce logistics costs and minimize the volume occupied by each cup. Therefore, in addition to providing good support and wearing comfort, molded cups should also exhibit excellent compressibility and foldability under vacuum, maintaining a small volume after compression and quickly returning to their original shape after decompression without affecting performance.
[0003] Currently, most molded cups on the market are made of lightweight materials such as polyurethane (PU) foam, polyolefin foam, or low-density polyester fiber cotton, through hot pressing or molding foaming processes. Specifically, the foam material or fiber cotton layer is placed in a mold, heated and pressurized to form a pre-set cup shape, and then cooled, shaped, cut, and covered to produce the finished molded cup. This type of manufacturing process is mature, low-cost, and suitable for mass production.
[0004] However, in pursuit of lightweight design, existing molded cups generally use low-density foam materials, resulting in a loose texture, poor feel, and a tendency to collapse and deform after compression. Increasing the density of the molded cup to enhance its texture and support also increases the rigidity of the material, significantly reducing its compressibility and foldability under vacuum pressure. This makes it difficult to effectively reduce the volume using conventional vacuum packaging, leading to low space utilization and high logistics costs during transportation. Summary of the Invention
[0005] To address the issues that existing molded cups cannot adequately combine high density and high elasticity, nor can they effectively compress and fold under vacuum negative pressure while maintaining good recovery performance and wearing comfort, this application provides a high-density, high-elasticity, easily compressible and foldable molded cup and its preparation method.
[0006] In a first aspect, this application provides a high-density, highly elastic, easily compressible and foldable mold cup, employing the following technical solution: A high-density, highly elastic, easily compressible and foldable molded cup is made from a foaming compound through molding and foaming. The foaming compound is made from the following raw materials in parts by weight: 15-25 parts of diisocyanate 8-15 parts of silane-modified isocyanate 22-28 parts of polyether polyol Crosslinking aid 4.5-7 parts 2-4 parts of foaming agent Catalyst 1.2-2.4 parts Antioxidant 1-3 parts; The silane-modified isocyanate is prepared from polyether polyol, 3-isocyanate-propyltriethoxysilane, tris(2-hydroxyethyl)isocyanurate and catalyst.
[0007] By employing the above technical solutions, diisocyanate can react with polyether polyols to form a mold cup matrix with a polyurethane structure combining hard and soft segments. This provides the mold cup with a certain degree of rigidity and strength while imparting good flexibility and elasticity. Silane-modified isocyanate possesses a flexible silane structure, giving the mold cup good flexibility and elasticity, and improving its compressibility and foldability under vacuum negative pressure. Crosslinking aids promote the crosslinking reaction between raw materials, enabling the mold cup to form a stable structure and increasing its crosslinking density and texture. The foaming agent generates gas during the molding and foaming process, forming a dense porous structure, giving the mold cup both high density and good elasticity, making it easy to compress and fold without easily deforming. Catalysts accelerate the reaction rate and improve production efficiency. Antioxidants prevent the mold cup from oxidizing and deteriorating during use and storage. There is a synergistic effect between silane-modified isocyanate, diisocyanate, polyether polyol, and crosslinking aids, giving the mold cup both high density and good elasticity.
[0008] The molded cup obtained in this application can effectively combine high density and high elasticity. It can achieve efficient compression and folding under vacuum negative pressure. After compression, it can maintain a small volume and quickly restore its original shape after decompression without affecting its performance. It also has good support and wearing comfort.
[0009] Preferably, the silane-modified isocyanate is prepared from the following raw materials in parts by weight: 30-35 parts of hexamethylene diisocyanate 12-15 parts of 3-isocyanate-propyltriethoxysilane 15-20 parts of tri(2-hydroxyethyl) isocyanurate Catalyst 0.1-0.2 parts.
[0010] By employing the above technical solutions, hexamethylene diisocyanate possesses a linear structure, which imparts excellent flexibility and elasticity to silane-modified isocyanates. 3-Isocyanopropyltriethoxysilane introduces silane groups, improving the compressive elasticity and toughness of the mold cup. Tris(2-hydroxyethyl)isocyanurate, acting as a crosslinking agent with three active hydroxyl groups, can fully react with hexamethylene diisocyanate and 3-isocyanopropyltriethoxysilane, introducing silane and aliphatic isocyanate segments to further enhance intermolecular crosslinking, increase the crosslinking density of the material, and improve the strength, flexibility, and stability of the mold cup. A catalyst accelerates the reaction process, ensuring its smooth progress. The silane-modified isocyanate prepared from these specific components gives the mold cup both high density and high elasticity, exhibiting good compressibility and foldability under vacuum, maintaining a small volume after compression, and quickly returning to its original shape after decompression.
[0011] Preferably, the silane-modified isocyanate is prepared by the following steps: Hexamethylene diisocyanate, 3-isocyanatopropyltriethoxysilane, tris(2-hydroxyethyl)isocyanurate and catalyst were added to a reaction apparatus, stirred and dissolved, heated and reacted until the NCO content was 3-5%, and the reaction was stopped to obtain silane-modified isocyanate.
[0012] By adopting the above technical solution, each component is added to the reaction equipment and stirred to dissolve, which can make the raw materials fully and evenly mixed, providing a good foundation for subsequent reactions. After heating the reaction to 3-5% NCO content, the reaction is stopped, and silane-modified isocyanate with reactive isocyanate end-capping can be obtained. It can be further reacted with crosslinking aids and polyether polyols in the system, and then used to prepare mold cups, so that the mold cups have high density and high elasticity.
[0013] Preferably, the dissolution temperature is 60-70℃ and the reaction temperature is 80-90℃.
[0014] By adopting the above technical solution, a dissolution temperature of 60-70℃ can fully dissolve hexamethylene diisocyanate, 3-isocyanatopropyltriethoxysilane, tris(2-hydroxyethyl)isocyanurate and catalyst, ensuring uniform mixing of raw materials; a reaction temperature of 80-90℃ can promote the smooth progress of the reaction and accurately control the NCO content at 3-5%, thereby obtaining a silane-modified isocyanate with good performance.
[0015] Preferably, the isocyanate is hexamethylene diisocyanate and / or isoflurane diisocyanate.
[0016] By adopting the above technical solution, the linear isocyanate structure can impart good flexibility and elasticity to the mold cup.
[0017] Preferably, the polyether polyol is polytetrahydrofuran ether diol with Mn=1000-2000.
[0018] By adopting the above technical solution and using polytetrahydrofuran ether diol with Mn=1000-2000 as the polyether polyol, the mold cups can be made to have better elasticity and flexibility.
[0019] Preferably, the crosslinking aid is composed of pentaerythritol triallyl ether and ethylene glycol dodecyl ether in a weight ratio of 1:(1.5-3).
[0020] By adopting the above technical solution, pentaerythritol triallyl ether, with its soft branched ether structure and active hydroxyl groups, and ethylene glycol dodecyl ether, with its flexible segments, work synergistically to increase crosslinking density while imparting flexibility and improving elasticity to the mold cup. This allows the mold cup to maintain good elasticity while increasing foaming density, enabling better efficient compression and folding under vacuum negative pressure, while also ensuring good recovery performance and wearing comfort.
[0021] Preferably, the foaming agent is water.
[0022] By adopting the above technical solution, water is used as a foaming agent in the system of this application. The reaction between water and isocyanate produces carbon dioxide gas, which can make the mold cup form a uniform cell structure, which helps to improve the elasticity and softness of the mold cup. Water is widely available and inexpensive, and water as a foaming agent meets environmental protection requirements, avoiding the environmental pollution problems that may be caused by the use of some chemical foaming agents, making the mold cup greener and more environmentally friendly.
[0023] Secondly, this application provides a method for preparing a high-density, high-elasticity, easily compressible and foldable mold cup, employing the following technical solution: A method for preparing a high-density, highly elastic, easily compressible and foldable mold cup includes the following steps: S1. Mix diisocyanate, silane-modified isocyanate, polyether polyol, crosslinking aid, foaming agent, catalyst and antioxidant evenly to obtain a mixture; S2. Inject the mixture into the mold, perform molding foaming, stamping and trimming to obtain a high-density, high-elasticity, easily compressible and foldable mold cup.
[0024] By adopting the above technical solution, step S1 involves uniformly mixing diisocyanate, silane-modified isocyanate, polyether polyol, crosslinking aid, foaming agent, catalyst, and antioxidant to obtain a mixture. This allows the raw materials to fully contact and react, ensuring the quality and performance stability of subsequent molding foaming. Step S2 involves injecting the mixture into a mold for molding foaming and stamping trimming to obtain a molded cup. Molding foaming allows the mixture to form a preset cup-shaped structure within the mold, and stamping trimming removes excess material. The resulting molded cup has high density, high elasticity, and is easy to compress and fold. This solves the problem that existing molded cups cannot effectively combine high density and high elasticity, nor can they effectively achieve efficient compression and folding under vacuum negative pressure, while also ensuring good recovery performance and wearing comfort.
[0025] Preferably, the foaming temperature is 120-150℃ and the foaming time is 1.5-3 minutes.
[0026] By adopting the above technical solution, compression molding foaming at a foaming temperature of 120-150℃ and a foaming time of 1.5-3 minutes can fully react the foaming material, forming a uniform and stable cell structure, thereby improving the elasticity and density of the mold cup.
[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The high-density, high-elasticity, easily compressible and foldable molded cup of this application is made by molding and foaming a foaming material prepared from diisocyanate, silane-modified isocyanate, polyether polyol, crosslinking aid, foaming agent, catalyst and antioxidant. The silane-modified isocyanate is prepared from polyether polyol, 3-isocyanatopropyltriethoxysilane, tris(2-hydroxyethyl)isocyanurate and catalyst. The molded cup can effectively combine high density and high elasticity, and can achieve efficient compression and folding under vacuum negative pressure. After compression, it can maintain a small volume and can quickly restore its original shape after decompression without affecting its performance. It also has good support and wearing comfort.
[0028] 2. The crosslinking aid is composed of pentaerythritol triallyl ether and ethylene glycol dodecyl ether, which can further optimize the foaming uniformity and density of the mold cup, thereby improving the density of the mold cup while improving its elasticity.
[0029] 3. The preparation process includes mixing the raw materials evenly to obtain a mixture, then injecting it into a mold for molding foaming, stamping and trimming. The resulting molded cup can maintain a small volume after compression and quickly restore its original shape after decompression, without affecting its performance, and taking into account both good recovery performance and wearing comfort. Detailed Implementation
[0030] The present application will be further described in detail below with reference to preparation examples and embodiments.
[0031] Preparation example of silane-modified isocyanate Preparation Example 1 Preparation Example 1 discloses a silane-modified isocyanate, which is prepared by the following steps: 3 kg of hexamethylene diisocyanate, 1.2 kg of 3-isocyanatopropyltriethoxysilane, 1.5 kg of tris(2-hydroxyethyl)isocyanurate and 0.01 kg of dibutyltin dilaurate were added to a reaction vessel as catalysts. The mixture was stirred and dissolved at 60°C, then heated to 80°C and reacted until the NCO content was 5%. The reaction was then stopped to obtain silane-modified isocyanate.
[0032] Preparation Examples 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.
[0033] Table 1. Parameters for Preparation Examples 1-3
[0034] Preparation of Comparative Example 1 The difference between Comparative Example 1 and Preparation Example 1 is that tris(2-hydroxyethyl) isocyanurate was replaced with polytetrahydrofuran ether diol in equal amounts, Mn=2000, otherwise it was the same as Preparation Example 1.
[0035] Example Example 1
[0036] Example 1 discloses a method for preparing a high-density, high-elasticity, easily compressible and foldable mold cup, comprising the following steps: S1. Mix 1.5 kg of hexamethylene diisocyanate as diisocyanate, 0.8 kg of silane-modified isocyanate prepared in Example 1, 2.2 kg of polytetrahydrofuran ether diol with Mn=1000 as polyether polyol, 0.45 kg of 1,4-butanediol as crosslinking aid, 0.2 kg of water as foaming agent, 0.12 kg of dibutyltin dilaurate as catalyst, and 0.1 kg of antioxidant 1010 as antioxidant evenly to obtain a mixture. S2. Inject the mixture into the mold and perform molding foaming at a temperature of 120℃ for 3 minutes. The molding pressure is 2MPa. Then, stamp and trim the edges to obtain a high-density, high-elasticity, easily compressible and foldable molded cup.
[0037] Example 2-3 The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 2 below.
[0038] Table 2 Parameter Table for Examples 1-3
[0039] Example 4
[0040] The difference between Example 4 and Example 1 is that the crosslinking agent is composed of pentaerythritol triallyl ether and ethylene glycol dodecyl ether in a weight ratio of 1:1.5; otherwise, it is the same as Example 1.
[0041] Example 5
[0042] The difference between Example 5 and Example 1 is that the crosslinking agent is composed of pentaerythritol triallyl ether and ethylene glycol dodecyl ether in a weight ratio of 1:3; otherwise, it is the same as Example 1.
[0043] Example 6
[0044] The difference between Example 6 and Example 4 is that the crosslinking agent is pentaerythritol triallyl ether, otherwise it is the same as Example 4.
[0045] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the silane-modified isocyanate was derived from the preparation of Comparative Example 1, while the rest is the same as Example 1.
[0046] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the silane-modified isocyanate was replaced with hexamethylene diisocyanate in equal amounts, while the rest was the same as in Example 1.
[0047] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that 3-isocyanate-propyltriethoxysilane in the silane-modified isocyanate is replaced with hexamethylene diisocyanate in equal amounts, while the rest is the same as in Example 1.
[0048] Performance testing The following performance tests were conducted on Examples 1-6 and Comparative Examples 1-3: I. Performance test of the mixture: The mixture obtained in step S1 is injected into the mold and foamed at a temperature of 120℃ to prepare the corresponding test sample.
[0049] 1. Density test The apparent density of the test sample (unit: kg / m³) was tested according to the test method in GB / T 6343-2009. 3 ).
[0050] 2. Rebound rate test The rebound rate (unit: %) of the test sample was tested according to the test method in GB / T 6670-2008.
[0051] 3. Compression permanent deformation rate test The test sample was compressed by 50% at 70℃ for 22 hours, and the compression permanent deformation rate (unit: %) was tested.
[0052] II. Molded Cup Performance Test Place the molded cup in a packaging bag, evacuate the packaging bag to a vacuum value of -0.08 MPa, leave it for 3 days, remove it and allow it to recover for 30 minutes, then test the thickness change rate of the molded cup. A thickness deformation rate of less than 3% is considered qualified.
[0053] The following are the performance test data for Examples 1-6 and Comparative Examples 1-3, as detailed in Table 3 below.
[0054] Table 3 Performance data of Examples 1-6 and Comparative Examples 1-3
[0055] Based on Examples 1-3 and Comparative Examples 1-3, and in conjunction with Table 3, it can be concluded that the silane-modified isocyanate prepared using the specific components of this application produces mold cups that maintain good elasticity while possessing high density, are easily compressed and folded, and do not deform. In Comparative Example 1, replacing tris(2-hydroxyethyl) isocyanate in the silane-modified isocyanate with an equal amount of polytetrahydrofuran ether diol resulted in a decrease in the apparent density of the mold cup, making it too soft, which in turn reduced its elasticity, increased its compression set, and caused deformation after vacuum compression. In Comparative Example 2, replacing the silane-modified isocyanate with hexamethylene diisocyanate increased the apparent density of the mold cup, but significantly reduced its resilience and increased its compression set, causing deformation after vacuum compression. In Comparative Example 3, replacing an equal amount of 3-isocyanatopropyltriethoxysilane in the silane-modified isocyanate with hexamethylene diisocyanate increased the apparent density of the mold cup, but significantly reduced its resilience and increased its compression set, resulting in deformation after vacuum compression. Further verification shows that using the silane-modified isocyanate of the specific components described in this application improves both the apparent density and the elasticity and deformation properties of the mold cup.
[0056] Combining Examples 1 and 4-6 with Table 3, it can be concluded that further optimization of the composition and ratio of the crosslinking aid can further improve the dense support of the mold cup while maintaining good elasticity and resistance to deformation. Compared with Example 1, Examples 4-5 show an increase in the apparent density of the mold cup, as well as improvements in elasticity and compressive deformation performance.
[0057] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A high-density, highly elastic, easily compressible and foldable molded cup, characterized in that, It is obtained by molding and foaming a foaming compound, which is made from the following raw materials in parts by weight: 15-25 parts of diisocyanate 8-15 parts of silane-modified isocyanate 22-28 parts of polyether polyol Crosslinking aid 4.5-7 parts 2-4 parts of foaming agent Catalyst 1.2-2.4 parts Antioxidant 1-3 parts; The silane-modified isocyanate is prepared from polyether polyol, 3-isocyanate-propyltriethoxysilane, tris(2-hydroxyethyl)isocyanurate and catalyst.
2. The high-density, high-elasticity, easily compressible and foldable molded cup according to claim 1, characterized in that, The silane-modified isocyanate is prepared from the following raw materials in parts by weight: 30-35 parts of hexamethylene diisocyanate 12-15 parts of 3-isocyanate-propyltriethoxysilane 15-20 parts of tri(2-hydroxyethyl) isocyanurate Catalyst 0.1-0.2 parts.
3. A high-density, high-elasticity, easily compressible and foldable molded cup according to claim 2, characterized in that, The silane-modified isocyanate is prepared by the following steps: Hexamethylene diisocyanate, 3-isocyanatopropyltriethoxysilane, tris(2-hydroxyethyl)isocyanurate and catalyst were added to a reaction apparatus, stirred and dissolved, heated and reacted until the NCO content was 3-5%, and the reaction was stopped to obtain silane-modified isocyanate.
4. A high-density, high-elasticity, easily compressible and foldable molded cup according to claim 3, characterized in that, The dissolution temperature is 60-70℃, and the reaction temperature is 80-90℃.
5. A high-density, high-elasticity, easily compressible and foldable molded cup according to claim 1, characterized in that, The isocyanate is hexamethylene diisocyanate and / or isoflurone diisocyanate.
6. A high-density, high-elasticity, easily compressible and foldable molded cup according to claim 1, characterized in that, The polyether polyol is polytetrahydrofuran ether diol, with Mn=1000-2000.
7. A high-density, high-elasticity, easily compressible and foldable molded cup according to claim 1, characterized in that, The crosslinking aid is composed of pentaerythritol triallyl ether and ethylene glycol dodecyl ether in a weight ratio of 1:(1.5-3).
8. A high-density, high-elasticity, easily compressible and foldable molded cup according to claim 1, characterized in that, The foaming agent is water.
9. A method for preparing a high-density, high-elasticity, easily compressible and foldable mold cup as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Mix diisocyanate, silane-modified isocyanate, polyether polyol, crosslinking aid, foaming agent, catalyst and antioxidant evenly to obtain a mixture; S2. Inject the mixture into the mold, perform molding foaming, stamping and trimming to obtain a high-density, high-elasticity, easily compressible and foldable mold cup.
10. The method for preparing a high-density, high-elasticity, easily compressible and foldable mold cup according to claim 9, characterized in that, The foaming temperature is 120-150℃, and the foaming time is 1.5-3 minutes.