DB::select named parameters don't seem to be binding

I'm trying to run some raw SQL safely, but my named parameters don't seem to be binding.

Here's my function

public function order_search(string $search_query): array
    {
        $sql = "SELECT item_lines.sku,
                    item_parent.internal_order_id, item_parent.vendor_order_id
                    FROM item_lines
                    LEFT JOIN item_parent
                    ON item_lines.item_parent_id = item_parent.id
                    WHERE sku LIKE '%:search_query%' OR internal_order_id LIKE '%:search_query2%'
                    OR vendor_order_id LIKE '%:search_query3%'";
        return DB::select( DB::raw($sql), ["search_query" => $search_query, "search_query2" => $search_query, "search_query3" => $search_query]);
    }

and I'm making the call in postman with a string that returns results when I try it on the command line.

The postman error is

 "message": "SQLSTATE[HY093]: Invalid parameter number (SQL: SELECT item_lines.sku,\n                    item_parent.internal_order_id, item_parent.vendor_order_id\n                    FROM item_lines\n                    LEFT JOIN item_parent\n                    ON item_lines.item_parent_id = item_parent.id\n                    WHERE sku LIKE '%:search_query%' OR internal_order_id LIKE '%:search_query2%'\n                    OR vendor_order_id LIKE '%:search_query3%')",