CN114311721A - 一种可食用、可生物降解餐具的制备方法 - Google Patents

一种可食用、可生物降解餐具的制备方法 Download PDF

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CN114311721A
CN114311721A CN202111613417.1A CN202111613417A CN114311721A CN 114311721 A CN114311721 A CN 114311721A CN 202111613417 A CN202111613417 A CN 202111613417A CN 114311721 A CN114311721 A CN 114311721A
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gel
tableware
mold
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CN114311721B (zh
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李曼
刘垣朴
马萌
贾若兵
孙庆杰
王静
欧泽洁
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Qingdao Agricultural University
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Abstract

本发明涉及可食用、可生物降解的环保餐具的制备方法,本发明提供的天然大分子基可食用、可降解餐具的制备方法,采用内源扩散和聚合物交联的原理,从微观状态上制备吸管、杯子、碗等可食用餐具。本发明的餐具材料在自然条件下即可快速降解,无需堆肥。本发明方法制备的餐具具有优异的水稳定性能。从材料获取的方面来说,卡拉胶、海藻酸钠等原材料来源广泛、稳定,可以形成对谷物淀粉、木材等很好替代,而且材料成本低廉。

Description

一种可食用、可生物降解餐具的制备方法
技术领域
本发明涉及可食用和/或可生物降解的环保餐具的制备方法技术领域,具体涉及一种可食用、可生物降解凝胶餐具的制备方法。
背景技术
自从限塑令发布后,对于石油基塑料餐具(例如吸管、杯子等)的使用日益减少。作为塑料餐具的替代品,纸质餐具难以满足人们的需要,尤其在用户的使用体验和成本控制上,纸质餐具需要持续改变。
目前商业化的可生物降解餐具主要的材料是聚乳酸、纸、谷物淀粉,而且聚乳酸餐具在真正意义上不属于全生物降解材料,美国和欧盟将聚乳酸材料划分为可堆肥降解材料,而不是全生物降解材料,这是因为聚乳酸降解需要特定的条件,降解过程较为复杂,需要大量的后续工作;纸质餐具因为其原料本身特性,吸水快、不耐泡且使用体验较差,尤其是无法在热水中使用,限制了纸质餐具的发展;谷物淀粉材质的餐具的水稳定性虽然比纸质餐具优异一些,但仍无法抵抗长时间浸泡和高温浸泡,比如,经过长时间浸泡和高温浸泡后的淀粉吸管犹如面条一般的质感,令使用者厌恶。其次在世界耕地面积短缺和粮食产量危机的情况下,工业化生产聚乳酸餐具和淀粉餐具,势必要和粮食作物的生产争夺条件,难以实现规模化生产。
在制备方法上,目前的商业化的可生物降解餐具主要是通过螺杆挤压技术、热塑成型、注塑加压技术等制备的,但这些技术多适用于低熔点的冷固性原料,对于难以熔融、熔点较高和在常温状态下难以凝固的原料难以进行生产。
发明内容
本发明提供了一种凝胶餐具的制备方法,本发明方法制备的餐具具有可食用、可生物降解的特性。与传统的双螺杆挤压技术相比,本发明所述凝胶餐具的制备方法新颖,是由内源扩散法制备而成。
本专利中,“可食用”是指可以被消费者安全地消耗。“可生物降解的”是指能够在典型的环境条件下通过生物(例如微生物)的作用分解成无害产物的物品。
一种餐具的制备方法,在加热的条件下将凝胶剂A和交联剂制成混合水溶液,冷却后制成餐具模具;将制备好的餐具模具放入凝胶剂B的水溶液中,静置,凝胶剂B和交联剂在模具表面交联形成餐具坯体;将餐具坯体与模具分离,分离后将餐具坯体进行干燥,即可得到成品餐具;
所述交联剂分散在凝胶剂A形成的凝胶模具中且不与凝胶剂A发生交联反应;
所述凝胶剂B和交联剂之间发生交联反应。
加热是为了使凝胶剂A在水中充分在融化,因此,加热的温度由所选择的凝胶剂A所决定。
具体的,所述凝胶剂A为琼脂、琼脂糖、聚乙烯醇中的一种或几种。
具体的,所述交联剂为氯化钙、氯化锌、乙酸钙、乙酸锌、葡萄糖酸钙、葡萄糖酸锌、乳酸锌、乳酸钙、氯化钾、植酸钠中的一种或几种。
具体的,所述凝胶剂B为卡拉胶、海藻酸钠、果胶、结冷胶、壳聚糖中的一种或几种。
进一步的,凝胶剂B溶液中还含有增塑剂;增塑剂为甘油、山梨醇、丙二醇、食用植物油中的一种或几种。优选的,所述增塑剂为甘油。更为优选的,所述增塑剂在凝胶剂B溶液中的浓度为0~10重量%。
进一步的,在成品餐具的内表面和/或外表面上表面上通过喷涂、浸涂或刷涂的方式施加可食用的防水涂层。
通过上述的方法,可以制备的餐具包括吸管、杯子、碗、碟子和勺等。
一种制备可食用、可生物降解吸管的方法,具体步骤如下:
(1)凝胶柱模具的制备:在加热的条件下将凝胶剂A和交联剂制成混合水溶液,将溶液灌装至柱形模具中,冷却后形成凝胶柱模具;
(2)管坯的制备:将制备好的凝胶柱模具放入凝胶剂B的水溶液中,静置,凝胶剂B和交联剂在模具表面交联形成一定厚度的吸管坯体;将吸管坯体与凝胶柱模具分离;
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到凝胶吸管。
上述的柱型模具可以使用玻璃管、金属管、塑料管或陶瓷管。
一种制备可食用、可生物降解的杯子、碗、碟和勺的方法,
(1)凝胶模具的制备:在加热的条件下将凝胶剂A和交联剂制成混合水溶液,将溶液灌装至杯子、碗、碟或勺的形状的模具中,冷却后形成凝胶模具;
(2)餐具坯体的制备:将制备好的杯子、碗、碟或勺的形状的凝胶模具放入凝胶剂B的水溶液中,静置,凝胶剂B和交联剂在凝胶模具一侧的表面交联形成一定厚度的餐具坯体;将餐具坯体与凝胶模具分离;
(3)凝胶餐具坯体干燥:将冲洗干净的凝胶餐具坯体进行干燥,得到成品杯子、碗、碟或勺。
卡拉胶(Carrageenan)是一种亲水性胶体,又称为麒麟菜胶、石花菜胶、鹿角菜胶、角叉菜胶。卡拉胶是从麒麟菜、石花菜、鹿角菜等红藻类海草中提炼出来的亲水性胶体。
海藻酸钠(Sodium alginate)是从褐藻类的海带或马尾藻中提取碘和甘露醇之后的副产物,是一种天然多糖,具有药物制剂辅料所需的稳定性、溶解性、粘性和安全性。
壳聚糖(Chitosan)为天然多糖甲壳素脱除部分乙酰基的产物,壳聚糖具有生物降解性、细胞亲和性和生物效应等许多独特的性质。
结冷胶(Gellan Gum)由假单胞杆菌在葡萄糖、玉米糖浆、磷酸盐、蛋白质、硝酸盐和微量元素组成的液体培养基中培养两天,得到一种天然胶体,具有良好的稳定性,耐酸、耐高温、热可逆性,还能抵抗微生物及酶的作用等特性。
果胶(Pectin)是一类广泛存在于植物细胞壁的初生壁和细胞中间片层的杂多糖,广泛应用于食品、医药保健品和一些化妆品中。
本发明提供了一种新的可食用、可降解餐具的制备方法,采用内源扩散和聚合物交联的原理,从微观状态上制备餐具(吸管、杯子、碗、碟或勺)。本发明的餐具材料在自然条件下即可快速降解,无需堆肥。本发明方法制备的餐具具有优异的水稳定性能。从材料获取的方面来说,海洋环境蕴藏着丰富的海藻,可以源源不断的提供卡拉胶、海藻酸钠等原材料,可以形成对谷物淀粉、木材等很好替代,而且材料成本低廉。
附图说明
通过阅读下文的具体实施方式的详细描述,本发明的优点和益处对于本领域普通技术人员将变得清楚明了。附图是说明性的,并不认为是对本发明的限制。在附图中:
图1为不同扩散时间条件下形成的吸管的抗弯曲强度;
图2为不同浸泡时间的吸管拉伸应力-应变曲线图;
图3为本发明的实施例1的方法制备的吸管管坯及干燥后的吸管(左图为静置30min后得到的吸管管坯,右图为管坯干燥后的吸管)。
具体实施方式
在本发明中所使用的术语,除非有另外说明,一般具有本领域普通技术人员通常理解的含义。下面结合具体实施例,并参照数据进一步详细的描述本发明。以下实施例只是为了举例说明本发明,而非以任何方式限制本发明的范围。
实施例1
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将3重量份的琼脂、8重量份的氯化钙加入到100重量份的去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成含有氯化钙和琼脂的水溶液,将水溶液灌装至柱形模具中,冷却后形成凝胶柱模具。
柱型模具可以使用玻璃管、金属管、塑料管或陶瓷管,内壁光滑,柱形模具的内径可以根据所要得到的吸管的内径自由选择,实施例1-5中均使用内径为0.8cm的柱形模具进行示例说明。
(2)管坯的制备:将凝胶柱模具切割成长度20cm。将20重量份的海藻酸钠在常温下溶于1000重量份的去离子水,形成海藻酸钠溶液。将切割好的凝胶柱模具竖直放入海藻酸钠溶液中,分别静置15min、30min和60min后;在凝胶柱模具周围分别形成了厚度为1.4mm、2.1mm和3.2mm的凝胶管坯。将凝胶柱模具分别从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
实施例2
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将0.5重量份的琼脂糖、8重量份的氯化钙加入到100重量份的去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成含有氯化钙和琼脂糖的水溶液,将溶液灌装至柱形模具中,冷却后形成凝胶柱模具。
(2)管坯的制备:将凝胶柱模具切割为长度20cm;将20重量份的海藻酸钠在常温下溶于1000重量份的去离子水,形成海藻酸钠溶液。将切割好的凝胶柱模具竖直放入海藻酸钠溶液中,分别静置15min、30min和60min,在凝胶柱模具周围形成厚度分别为1.4mm、2.1mm和3.2mm的凝胶管坯。将凝胶柱模具从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
实施例3
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将3重量份的琼脂、10重量份的氯化锌加入到100重量份的去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成氯化锌内源琼脂溶液,将溶液灌装至柱形模具中,冷却后形成凝胶柱模具。
(2)管坯的制备:将凝胶柱模具切割为长度20cm的凝胶柱。将50重量份的海藻酸钠在常温下溶于1000重量份的去离子水,形成海藻酸钠溶液。将切割好的凝胶柱模具竖直放入海藻酸钠溶液中,分别静置15min、30min和60min,在凝胶柱模具周围形成厚度分别为1.9mm、3.2mm和3.9mm的凝胶管坯。将凝胶柱模具从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
实施例4
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将3重量份的琼脂、8重量份的氯化钙加入到100重量份的去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成氯化钙内源琼脂溶液,将溶液灌装至柱形模具,冷却后形成凝胶柱模具。
(2)管坯的制备:将凝胶柱模具切割为长度20cm的凝胶柱。将20重量份的海藻酸钠、100重量份的甘油在常温下溶于1000重量份的去离子水,形成海藻酸钠混合溶液。将切割好的凝胶柱模具竖直放入海藻酸钠混合溶液中,分别静置15min、30min和60min,在凝胶柱模具周围形成厚度分别为1.4mm、2.1mm和3.2mm的凝胶管坯。将凝胶柱模具从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
本实施例的方法中加入了甘油,当空气湿度低时(比如空气湿度低于40%),长时间贮存的吸管在反复弯折后会出现开裂的现象,而添加甘油后则能够明显改善。
实施例5
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将3重量份的琼脂、8重量份的氯化钾加入到100重量份的去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成氯化钾内源琼脂溶液,将溶液灌装至柱形模具,冷却后形成凝胶柱模具。
(2)管坯的制备:将凝胶柱模具切割为长度20cm的凝胶柱。将20重量份的k-卡拉胶、在80℃下溶于1000重量份的去离子水,形成k-卡拉胶溶液。将切割好的凝胶柱模具竖直放入55℃的k-卡拉胶溶液中,分别静置10min、20min和30min,在凝胶柱模具周围形成厚度分别为1.5mm、2.3mm和3.5mm的凝胶管坯。将凝胶柱模具从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
实施例6
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将3重量份的琼脂、8重量份的氯化钙加入到100重量份的去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成氯化钙内源琼脂溶液,将溶液灌装至柱形模具,冷却后形成凝胶柱模具。
(2)管坯的制备:将凝胶柱模具切割为长度20cm的凝胶柱。将20重量份的果胶、在90℃下溶于1000重量份的去离子水,形成果胶溶液。将切割好的凝胶柱模具竖直放入55℃的果胶溶液中,分别静置15min、30min和60min,在凝胶柱模具周围形成厚度分别为1.3mm、2.2mm和3.2mm的凝胶管坯。将凝胶柱模具从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
实施例7
本实施例以吸管为例,提供一种制备可食用、可生物降解凝胶吸管的方法,步骤如下:
(1)凝胶柱模具的制备:将0.5重量份的琼脂糖、4重量份的氯化钙和4重量份的氯化钾加入到100重量份去离子水中,在95℃的条件下水浴加热30min至溶解完全,形成氯化钙和氯化钾混合内源琼脂糖溶液,将溶液灌装至柱形模具中,冷却后形成凝胶柱模具。
(2)管坯的制备:将凝胶柱模具切割为长度20cm的凝胶柱。将10重量份的k-卡拉胶和10重量份的海藻酸钠在常温下溶于1000重量份的去离子水,形成k-卡拉胶-海藻酸钠溶液。将切割好的凝胶柱模具竖直放入k-卡拉胶-海藻酸钠溶液中,分别静置15min、30min和60min,在凝胶柱模具周围形成厚度分别为1.5mm、2.3mm和3.4mm的凝胶管坯。将凝胶柱模具从凝胶管坯中取出,并用去离子水冲洗凝胶管坯上附着的溶液。
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到厚度不同的凝胶吸管。
以上实施例中的重量份指的是g、kg、吨等重量单位。
以吸管制造为例,选用琼脂、氯化钙和海藻酸钠三种材料,介绍吸管的成型过程。
在吸管的制作过程中,交联剂-氯化钙先与凝胶剂A-琼脂混合在一起,随着琼脂的凝固,氯化钙均匀的分散在琼脂凝胶中。当琼脂制作的凝胶模具放入凝胶剂B-海藻酸钠的溶液中后,琼脂凝胶模具中的Ca2+会往外迁移,与溶液中的海藻酸钠形成不溶于水的海藻酸钙,最终在琼脂凝胶的壁上形成海藻酸钙管坯。管坯的厚度主要由钙离子的含量和海藻酸钠的含量以及反应时间决定,在此不进行具体的限定,可以根据实际的需求来确定具体的浸泡静置时间。
吸管干燥示例方法:
吸管干燥时,先将冲洗干净的凝胶管坯套在支撑柱上(防止管坯变形,支撑柱的直径可以与柱形模具的内径相同或略小于柱型模具的内径,略小于指的是支撑柱的直径比柱形模具的内径小0-0.05mm),放入恒温恒湿箱(温度为60℃,湿度为55%)中进行干燥,干燥后取出吸管及支撑柱,将支撑柱从干燥的管坯中取出(取出时可以在常温下浸泡去离子水1min);取出后的管坯套在新的支撑柱上(此处的支撑柱的直径要比上步中的支撑柱直径小,因为此时管坯已经具有了一定的硬度,支撑柱无需与管坯内壁紧密贴合),继续放入恒温恒湿箱(温度为60℃,湿度为55%)中进行第二次干燥。干燥过程中,恒温恒湿箱中的温度和湿度设置均属于示例性,并非限定性的。
吸管的弯曲强度测试
对实施例1制备的三种厚度的吸管进行性能分析,具体步骤如下:
将实施例1制备的三种厚度的吸管分别切割为18cm长,去除不平整的毛边,以其为模型,进行质构分析,使用质构仪(英国SMS(Stable Micro Systems)公司,TA.XT plus C型)对吸管进行三点弯曲测试,模拟吸管在运输过程中收到的压力,测试吸管的弯曲强度。参数设置如下:采用位移模式,测前速度1mm/sec、2mm/sec、10mm/sec,探头高度50mm,压缩深度30mm,板间距离5cm。
试验结果如图1所示。
由图1可知,吸管抗弯强度随着扩散时间的增强而增强。即使是经过15min的短暂扩散,其抗弯曲强度可达250g。经过60min的长时间扩散,吸管的弯曲强度约为1300g。由此可见,本发明方法制备的吸管具有良好的抗弯曲性能。
吸管的拉伸性能测试
以实施例1的方法制备凝胶吸管,静置时间为30min。取三根吸管分别放入量筒中,用去离子水分别浸泡30s、30min、24h,浸泡后拿出,用滤纸擦干表面,截取长为4cm,宽为2cm的长方形拉伸条,使用万能拉伸仪(英斯特朗,电子万能材料试验机5943型)进行拉伸性能测试。测试条件如下:夹具距离固定在20mm,拉伸速率为100mm/min,拉伸测试在室温25℃的条件下进行。
实验结果如图2所示。
由图2可知,吸管从浸泡30s到24h,均能保持良好的拉伸性能,由此可见,本发明制备的吸管,其抗溶胀性能良好,具有良好的耐泡性能。
实施例1-7以吸管制作为例详细说明了本发明的方法,关于碗、碟、杯子、和勺的制作方法与吸管的制作方法类似,主要不同的是成型的凝胶柱模具,在此对其他几种餐具的制备方法不再进行赘述。
为了增强防水性并延长保质期,在本发明方法制备的可食用餐具表面可以涂覆有可食用的涂层。可以通过喷涂,浸涂,刷涂等方式施加到餐具的内表面和/或外表面上。
可食用涂层材料可以椰子油,棕榈油,山毛榉油,蓖麻油,棉籽油,榛子油,橄榄油,棕榈仁油,花生油,果皮油,罂粟油,黑加仑籽油,亚麻籽油,紫红花油,葡萄干籽油,油菜籽油,米糠油,红花油,芝麻油,葵花籽油,姜黄油,大豆油,杏仁油,巴西坚果油,腰果油,松子油,开心果油和核桃油;或者选用短链或中链或长链甘油三酸酯,甘油单酸酯和/或甘油二酸酯;糖果釉;乙酰化甘油单酸酯;可食用蜡,如蜂蜡,米糠蜡。
以上所述,仅是本发明的较佳实施例而已,并非是对本发明作其它形式的限制,任何熟悉本专业的技术人员可能利用上述揭示的技术内容加以变更为等同变化的等效实施例。但是凡是未脱离本发明技术方案内容,依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与改型,仍属于本发明技术方案的保护范围。

Claims (12)

1.一种可食用、可生物降解餐具的制备方法,其特征在于,在加热的条件下将凝胶剂A和交联剂制成混合水溶液,冷却后制成餐具模具;将制备好的餐具模具放入凝胶剂B的水溶液中,静置,凝胶剂B和餐具模具中的交联剂在模具表面交联形成餐具坯体;将餐具坯体与模具分离,分离后将餐具坯体进行干燥,即可得到成品餐具;
所述交联剂分散在凝胶剂A形成的凝胶模具中且不与凝胶剂A发生交联反应;
所述凝胶剂B和交联剂之间发生交联反应。
2.根据权利要求1所述的制备方法,其特征在于,所述凝胶剂A为琼脂、琼脂糖、聚乙烯醇中的一种或几种。
3.根据权利要求1所述的制备方法,其特征在于,所述交联剂为氯化钙、氯化锌、乙酸钙、乙酸锌、葡萄糖酸钙、葡萄糖酸锌、乳酸锌、乳酸钙、氯化钾、植酸钠中的一种或几种。
4.根据权利要求1所述的制备方法,其特征在于,所述凝胶剂B为卡拉胶、海藻酸钠、果胶、结冷胶、壳聚糖中的一种或几种。
5.根据权利要求1所述的制备方法,其特征在于,凝胶剂B溶液中含有增塑剂。
6.根据权利要求5所述的制备方法,其特征在于,所述增塑剂为甘油、山梨醇、丙二醇、食用植物油中的一种或几种。
7.根据权利要求6所述的制备方法,其特征在于,所述增塑剂在凝胶剂B溶液中的浓度为0~10重量%。
8.根据权利要求1所述的制备方法,其特征在于,在成品餐具的内表面和/或外表面上表面上通过喷涂、浸涂或刷涂的方式施加可食用的防水涂层。
9.根据权利要求1所述的制备方法,其特征在于,所述餐具包括吸管、杯子、碗、碟子和勺。
10.一种使用权利要求1-8的方法制备吸管的方法,其特征在于,具体步骤如下:
(1)凝胶柱模具的制备:在加热的条件下将凝胶剂A和交联剂制成混合水溶液,将溶液灌装至柱形模具中,冷却后形成凝胶柱模具;
(2)管坯的制备:将制备好的凝胶柱模具放入凝胶剂B的水溶液中,静置,凝胶剂B和凝胶柱模具中的交联剂在模具表面交联形成一定厚度的吸管坯体;将吸管坯体与凝胶柱模具分离;
(3)凝胶管坯干燥:将冲洗干净的凝胶管坯进行干燥,得到凝胶吸管。
11.根据权利要求10所述的方法,其特征在于,柱型模具为玻璃管、金属管、塑料管、陶瓷管。
12.一种使用权利要求1-8的方法制备杯子、碗、碟和勺的方法,其特征在于,
(1)凝胶模具的制备:在加热的条件下将凝胶剂A和交联剂制成混合水溶液,将溶液灌装至杯子、碗、碟或勺的形状的模具中,冷却后形成凝胶模具;
(2)餐具坯体的制备:将制备好的杯子、碗、碟或勺的形状的凝胶模具放入凝胶剂B的水溶液中,静置,凝胶剂B和凝胶模具中的交联剂在凝胶模具一侧的表面交联形成一定厚度的餐具坯体;将餐具坯体与凝胶模具分离;
(3)凝胶餐具坯体干燥:将冲洗干净的凝胶餐具坯体进行干燥,得到成品杯子、碗、碟或勺。
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