CN111205520A - 一种微发泡宠物用球及其制作方法 - Google Patents
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Abstract
一种微发泡宠物用球及其制作方法,涉及复合材料的生产技术领域,先将NR、POE、炭黑、防老剂和增塑剂混合后通过密炼机混炼、卸料,取得混炼物料;再将混炼物料置于开炼机上进行降温分散混炼同时添加OBSH改性发泡剂和硫化剂、促进剂,混炼均匀拉薄通后成片,再经冷却取得混合物料;然后将混合物料在挤出机上通过高剪切力制取光滑的胚料,经裁切成粗胚,并涂上滑石粉,然后置于成型模具中,在高温硫化剂中硫化后出模,经冷却、修边,即得。本发明产品手感轻盈,回弹性好,颜色鲜艳,且具有良好韧性和撕裂性好,表面光滑的球体,可以吸引宠物玩耍,宠物撕咬耐久性高。
Description
技术领域
本发明涉及复合材料的生产技术领域。
背景技术
传统工艺生产的宠物用球主体材料单一采用橡胶材料制作而成,存在着韧性差、强度低、表面容易产生薄弱的气泡孔的缺陷,经过反复撕咬,球体表面容易损坏。另一方面传统的宠物用球生产工艺中采用N, N-二亚硝基五亚甲基四胺(发泡剂H),在经过高温硫化之后,这种发泡剂的残留物含有硝基或亚硝基的衍生物,有一定毒性,对宠物身体有伤害。
发明内容
为了克服以上现有技术存在的缺陷,本发明的目的在于提供一种微发泡宠物用球。
本发明主要由NR 、POE、炭黑、防老剂、增塑剂、OBSH改性发泡剂、硫化剂和促进剂组成。
随着橡塑并用材料的不断发展,技术日趋成熟,天然橡胶(即NR)并用聚乙烯辛烯共弹性体(简称POE)不但可以保持橡胶的高弹性和高强度,同时也可以具备POE的韧性,经过不断的实验,还发现橡塑并用可以在微发泡材料领域制得表面光滑,内部发泡均匀的制品。另外通过各种材料的配合可以解决4,4-氧代双苯磺酰肼发泡温度过高,而球体产品壁厚,导致橡塑材料热传导效率低下这种矛盾问题所导致的制品表面开裂,球体内部分层等技术问题。本发明通过引入尿素等材料制备改性发泡剂来降低OBSH改性发泡剂的发泡温度,且保持了该发泡剂发泡均匀且收缩率低等特点,更重要的是OBSH发泡剂残留物无毒无害。另一方面本发明采用硫化体系的配合,降低了橡塑主体的交联速度,使得交联速度与发泡速度相互匹配,这样就制得了内外发泡均匀且表面光滑不开裂的球体。所制得的球体具有弹性好,韧性强,表面光滑,颜色鲜艳的特点,可以吸引宠物玩耍,耐受宠物撕咬。
总之,本发明通过天然橡胶和聚乙烯辛烯共弹性体机械共混并用经过硫化交联,并高温催化发泡,制得手感轻盈,回弹性好,颜色鲜艳,且具有良好韧性和撕裂性好,表面光滑的球体,可以吸引宠物玩耍,适应宠物撕咬等行为耐久性高。
进一步地,本发明所述NR 、POE、炭黑、防老剂、增塑剂、OBSH改性发泡剂、硫化剂和促进剂的重量比为50~60∶10~20∶20~30∶0 .6~1 .0∶10~15∶1 .5~2 .5∶0 .6~1 .0∶0 .6~1 .0。
本发明以NR作为主体材料是保持该材料的弹性和机械强度,配以一定重量比的POE可以增强该产品的韧性,并且经过反复试验发现添加POE有利于该产品表面的光滑完整。另外硫化剂和促进剂的比例可以使得在高温硫化过程中,发泡速度与硫化速度相互匹配,不至于在硫化后产品烂边,大气泡,发泡不均匀等问题。
另外,所述NR为20#标胶,其门尼粘度为80~110。采用该参数的天然橡胶可以使产品具有较高的机械强度和弹性,同时该门尼粘度在经过配比可以对发泡的大小均匀性一定的控制。
所述POE的熔点为60~70℃,100%模量为3.0~5.0 MPa。该参数的聚乙烯辛烯共弹性体具有很好的韧性,且无毒无害,软化点比较低,有利于加工,同时对产品提高耐用性和表面光洁有很好的作用。
本发明的另一目的在于提供上述微发泡宠物用球的制备方法。
本发明包括如下步骤:
1)将NR 、POE、炭黑、防老剂和增塑剂混合后通过密炼机混炼12~20min,于110~120℃温度卸料,取得混炼物料;
2)将混炼物料置于开炼机上进行降温分散混炼同时添加OBSH改性发泡剂和硫化剂、促进剂,混炼均匀拉薄通后成片,再经冷却至少8小时,取得混合物料;
3)将混合物料在挤出机上通过高剪切力制取光滑的胚料;
4)将胚料裁切成粗胚,并涂上滑石粉,然后置于成型模具中,在高温硫化剂中硫化后出模,经冷却、修边,即得微发泡宠物用球。
本发明工艺简单、合理,利于生产,制成的产品稳定性好。另外,该工艺还具有以下特点:
1、橡塑并用,利用高温密炼工艺将橡胶与塑料共混。
2、采用发泡助剂降低发泡剂发泡临界温度。
3、通过合理的配合使得发泡温度和硫化温度匹配达到发泡均匀并且表面不破裂。
4、采用挤出制作胚料成型工艺。
进一步地,所述NR 、POE、炭黑、防老剂、增塑剂、OBSH改性发泡剂、硫化剂和促进剂的投料重量比为50~60∶10~20∶20~30∶0 .6~1 .0∶10~15∶1 .5~2 .5∶0 .6~1 .0∶0.6~1 .0。
所述OBSH改性发泡剂的制备方法是:将4,4-氧代双苯磺酰肼、硬脂酸酸锌和尿素以5∶1∶1.5的重量比混合后经高速搅拌分散均匀制得。此处,采用尿素和硬脂酸酸锌作为催化材料,可有效降低发泡剂OBSH的临界发泡温度,利于整个材料在高温硫化过程中发泡速度与硫化速度的配合,发泡过快容易产生大孔或者表面穿孔,发泡过慢容易局部密实,不均匀,比重过大。
以上OBSH改性发泡剂的制备中采用的4,4-氧代双苯磺酰肼的粒度为1000~2000目。如4,4-氧代双苯磺酰肼的粒度过大,容易表面发泡,造成表面强度过低,影响使用效果。而如4,4-氧代双苯磺酰肼的粒度过小,将导致混合分散不均匀,制品内部发泡不均匀,比重偏大,影响手感。
所述NR为20#标胶,门尼粘度为80~110;所述POE的熔点为60~70℃,100%模量为3.0~5.0 MPa。
另外,硫化20分钟,硫化温度为150~170℃。该硫化条件的设计出发点:一方面温度需要控制在该材料的发泡临界点之上,有利于在材料熔融状态下产生气泡。另一方面硫化时间需要和该材料的硫化速度和发泡速度匹配,以便达到最佳的发泡状态。
具体实施方式
一、制备OBSH改性发泡剂:
1、称量:
分别称取粒度为1000~2000目的4,4-氧代双苯磺酰肼5 kg、硬脂酸酸锌1kg和尿素1.5kg。
2、制备工艺:
将以上各料全部设入放入高速搅拌机中,转速不低于5000转/分钟。
经过2~5分钟后,停机,静置30分钟待材料沉降。
经过0.5小时后开盖,目测粉体表面均匀无杂质,色泽均匀后出料,待用。
3、制得的OBSH改性发泡剂的产品特点及参数:
(1)白色颗粒,颜色均匀。
(2)发泡临界温度在150℃。
二、制造宠物用球:
1、制造步骤:
(1)按各配方例分别称取各原料。
(2)将除了OBSH改性发泡剂和硫化剂,促进剂之外各组分充分混合后通过密炼机混炼12~20min,于110~120℃温度卸料。
(3)将步骤(2)所得的物料于开炼机上进行降温分散混炼同时添加OBSH改性发泡剂和硫化剂,促进剂,混炼均匀拉薄通后成片,冷却至少8小时后代用。
(4)将步骤(3)所得的物料在挤出机上通过高剪切力制取光滑的胚料。
(5)将步骤(4)所得的胚料按照重量裁切成粗胚,并涂上滑石粉。
(6)将步骤(5)制得的粗胚加入成型模具中,在高温硫化剂中硫化20分钟,硫化温度150~170℃,出模冷却后修边即可制得泡宠物用球。
2、称量配方及制成的产品对应的性能、参数:
各配方例中、NR(天然橡胶)为20#标胶,其门尼粘度为80~110。
POE(聚乙烯辛烯共弹性体)熔点在 60~70℃之间,100%模量在3.0~5.0 MPa之间。
下表中称量单位为:phr。
3、泡宠物用球特点:
球体表面光滑,无裂纹;颜色可以是各种颜色;气密度在0.3~0.8克/cm3。
回弹性大于50%。
Claims (10)
1. 一种微发泡宠物用球,其特征在于主要由NR 、POE、炭黑、防老剂、增塑剂、OBSH改性发泡剂、硫化剂和促进剂组成。
2.根据权利要求1所述微发泡宠物用球,其特征在于所述NR 、POE、炭黑、防老剂、增塑剂、OBSH改性发泡剂、硫化剂和促进剂的重量比为50~60∶10~20∶20~30∶0 .6~1 .0∶10~15∶1 .5~2 .5∶0 .6~1 .0∶0 .6~1 .0。
3.根据权利要求1或2所述微发泡宠物用球,其特征在于所述NR为20#标胶,门尼粘度为80~110。
4.根据权利要求1或2所述微发泡宠物用球,其特征在于所述POE的熔点为60~70℃,100%模量为3.0~5.0 MPa。
5.如根据权利要求1所述微发泡宠物用球的制作方法,其特征在于包括如下步骤:
1)将NR 、POE、炭黑、防老剂和增塑剂混合后通过密炼机混炼12~20min,于110~120℃温度卸料,取得混炼物料;
2)将混炼物料置于开炼机上进行降温分散混炼同时添加OBSH改性发泡剂和硫化剂、促进剂,混炼均匀拉薄通后成片,再经冷却至少8小时,取得混合物料;
3)将混合物料在挤出机上通过高剪切力制取光滑的胚料;
4)将胚料裁切成粗胚,并涂上滑石粉,然后置于成型模具中,在高温硫化剂中硫化后出模,经冷却、修边,即得微发泡宠物用球。
6.根据权利要求5所述微发泡宠物用球的制作方法,其特征在于所述NR 、POE、炭黑、防老剂、增塑剂、OBSH改性发泡剂、硫化剂和促进剂的投料重量比为50~60∶10~20∶20~30∶0.6~1 .0∶10~15∶1 .5~2 .5∶0 .6~1 .0∶0 .6~1 .0。
7.根据权利要求5所述微发泡宠物用球的制作方法,其特征在于所述OBSH改性发泡剂的制备方法是:将4,4-氧代双苯磺酰肼、硬脂酸酸锌和尿素以5∶1∶1.5的重量比混合后经高速搅拌分散均匀制成。
8.根据权利要求7所述微发泡宠物用球,其特征在于所述4,4-氧代双苯磺酰肼的粒度为1000~2000目。
9.根据权利要求5所述微发泡宠物用球的制作方法,其特征在于所述NR为20#标胶,门尼粘度为80~110;所述POE的熔点为60~70℃,100%模量为3.0~5.0 MPa。
10.根据权利要求5所述微发泡宠物用球的制作方法,其特征在于硫化20分钟,硫化温度为150~170℃。
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